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801.2573 |
Rachel Osten
|
Rachel A. Osten
|
Transient Emissions from Radio-Active Stars: Implications for Wide-Field
Radio Surveys
|
10 pages, 2 figures. Invited refereed review from conference "Bursts,
Pulses and Flickering: Wide-field Monitoring of the Dynamic Radio Sky". Full
resolution figures available from Proceedings of Science web site:
http://www.pos.sissa.it/cgi-bin/reader/conf.cgi?confid=56
|
PoS Dynamic:005,2007
| null | null |
astro-ph
| null |
Variability is a common characteristic of magnetically active stars. Flaring
variability is usually interpreted as the observable consequence of transient
magnetic reconnection processes happening in the stellar outer atmosphere.
Stellar flares have been observed now across 11 decades in
wavelength/frequency/energy; such a large span implies that a range of physical
processes takes place during such events. Despite the fact that stellar radio
flares have long been recognized and studied, key unanswered questions remain.
I will highlight what, in my opinion, are some of these questions. I will also
describe recent results on stellar flare emissions at radio wavelengths,
discussing the nature of coherent and incoherent emissions and the prospects of
wide-field radio imaging telescopes for studying such events.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 21:09:52 GMT"
}
] | 2009-06-23T00:00:00 |
[
[
"Osten",
"Rachel A.",
""
]
] |
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] |
801.2574 |
Evgeniy Khain
|
Evgeniy Khain and Leonard M. Sander
|
A generalized Cahn-Hilliard equation for biological applications
|
11 figures, submitted to PRE
| null |
10.1103/PhysRevE.77.051129
| null |
cond-mat.stat-mech
| null |
Recently we considered a stochastic discrete model which describes fronts of
cells invading a wound \cite{KSS}. In the model cells can move, proliferate,
and experience cell-cell adhesion. In this work we focus on a continuum
description of this phenomenon by means of a generalized Cahn-Hilliard equation
(GCH) with a proliferation term. As in the discrete model, there are two
interesting regimes. For subcritical adhesion, there are propagating "pulled"
fronts, similarly to those of Fisher-Kolmogorov equation. The problem of front
velocity selection is examined, and our theoretical predictions are in a good
agreement with a numerical solution of the GCH equation. For supercritical
adhesion, there is a nontrivial transient behavior, where density profile
exhibits a secondary peak. To analyze this regime, we investigated relaxation
dynamics for the Cahn-Hilliard equation without proliferation. We found that
the relaxation process exhibits self-similar behavior. The results of continuum
and discrete models are in a good agreement with each other for the different
regimes we analyzed.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 21:15:56 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Khain",
"Evgeniy",
""
],
[
"Sander",
"Leonard M.",
""
]
] |
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] |
801.2575 |
Dominic Hughes
|
Dominic Hughes
|
Hypergames and full completeness for system F (rough draft)
|
Notes for the talk "Hypergame semantics: ten years later" given at
`Games for Logic and Programming Languages', Seattle, August 2006. 31 pages,
multiple figures
| null | null | null |
math.LO
| null |
This paper reviews the fully complete hypergames model of system $F$,
presented a decade ago in the author's thesis. Instantiating type variables is
modelled by allowing ``games as moves''. The uniformity of a quantified type
variable $\forall X$ is modelled by copycat expansion: $X$ represents an
unknown game, a kind of black box, so all the player can do is copy moves
between a positive occurrence and a negative occurrence of $X$.
This presentation is based on slides for a talk entitled ``Hypergame
semantics: ten years later'' given at `Games for Logic and Programming
Languages', Seattle, August 2006.
|
[
{
"version": "v1",
"created": "Tue, 15 Jan 2008 21:52:49 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Hughes",
"Dominic",
""
]
] |
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] |
801.2576 |
Ian Linington
|
I.E. Linington and B.M. Garraway
|
Control of atomic decay rates via manipulation of reservoir mode
frequencies
|
12 pages, 9 figures
|
J. Phys. B: At, 39 pp. 3383--3401 (2006)
|
10.1088/0953-4075/39/16/020
| null |
quant-ph
| null |
We analyse the problem of a two-level atom interacting with a time-dependent
dissipative environment modelled by a bath of reservoir modes. In the model of
this paper the principal features of the reservoir structure remain constant in
time, but the microscopic structure does not. In the context of an atom in a
leaky cavity this corresponds to a fixed cavity and a time-dependent external
bath. In this situation we show that by chirping the reservoir modes
sufficiently fast it is possible to inhibit, or dramatically enhance the decay
of the atomic system, even though the gross reservoir structure is fixed. Thus
it is possible to extract energy from a cavity-atom system faster than the
empty cavity rate. Similar, but less dramatic effects are possible for moderate
chirps where partial trapping of atomic population is also possible.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 21:31:37 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Linington",
"I. E.",
""
],
[
"Garraway",
"B. M.",
""
]
] |
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] |
801.2577 |
Ernie Croot
|
Ernie Croot and Olof Sisask
|
A new proof of Roth's theorem on arithmetic progressions
|
6 pages. To appear in Proceedings of the AMS
| null | null | null |
math.CO math.NT
| null |
We present a proof of Roth's theorem that follows a slightly different
structure to the usual proofs, in that there is not much iteration. Although
our proof works using a type of density increment argument (which is typical of
most proofs of Roth's theorem), we do not pass to a progression related to the
large Fourier coefficients of our set (as most other proofs of Roth do).
Furthermore, in our proof, the density increment is achieved through an
application of a quantitative version of Varnavides's theorem, which is perhaps
unexpected.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 21:38:49 GMT"
},
{
"version": "v2",
"created": "Tue, 1 Apr 2008 17:42:52 GMT"
}
] | 2008-04-01T00:00:00 |
[
[
"Croot",
"Ernie",
""
],
[
"Sisask",
"Olof",
""
]
] |
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] |
801.2578 |
Andrew Gould
|
Andrew Gould (Ohio State)
|
Hexadecapole Approximation in Planetary Microlensing
|
ApJ in press, 12 pages including 2 figures. Update takes account of
important work by Pejcha & Heyrovsky
| null |
10.1086/588601
| null |
astro-ph
| null |
The frequency of microlensing planet detections, particularly in
difficult-to-model high-magnification events, is increasing. Their analysis can
require tens of thousands of processor hours or more, primarily because of the
high density and high precision of measurements whose modeling requires
time-consuming finite-source calculations. I show that a large fraction of
these measurements, those that lie at least one source diameter from a caustic
or the extension from a cusp, can be modeled using a very simple hexadecapole
approximation, which is one to several orders of magnitude faster than
full-fledged finite-source calculations. Moreover, by restricting the regions
that actually require finite-source calculations to a few isolated `caustic
features', the hexadecapole approximation will, for the first time, permit the
powerful `magnification-map' approach to be applied to events for which the
planet's orbital motion is important.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 17:00:38 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Mar 2008 22:36:22 GMT"
},
{
"version": "v3",
"created": "Thu, 3 Apr 2008 15:22:18 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Gould",
"Andrew",
"",
"Ohio State"
]
] |
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-0.0127949947,
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-0.0211088583,
-0.0187314115,
-0.051727511,
0.037145827,
0.0307195131,
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-0.0523614958,
-0.07527145,
-0.0159937423,
-0.0065812091,
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-0.0443213992,
-0.0893920586,
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-0.0929654315,
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0.0514393337
] |
801.2579 |
Christopher J. Burke
|
Christopher J. Burke
|
Impact of Orbital Eccentricity on the Detection of Transiting Extrasolar
Planets
|
8 pages, 6 Figures, Submitted to ApJ
| null |
10.1086/587798
| null |
astro-ph
| null |
For extrasolar planets with orbital periods, P>10 days, radial velocity
surveys find non-circular orbital eccentricities are common, <e>~0.3. Future
surveys for extrasolar planets using the transit technique will also have
sensitivity to detect these longer period planets. Orbital eccentricity affects
the detection of extrasolar planets using the transit technique in two opposing
ways: an enhancement in the probability for the planet to transit near
pericenter and a reduction in the detectability of the transit due to a shorter
transit duration. For an eccentricity distribution matching the currently known
extrasolar planets with P>10 day, the probability for the planet to transit is
~1.25 times higher than the equivalent circular orbit and the average transit
duration is ~0.88 times shorter than the equivalent circular orbit. These two
opposing effects nearly cancel for an idealized field transit survey with
independent photometric measurements that are dominated by Poisson noise. The
net effect is a modest ~4% increase in the transiting planet yield compared to
assuming all planets have circular orbits. When intrinsic variability of the
star or correlated photometric measurements are the dominant source of noise,
the transit detectability is independent of the transit duration. In this case
the transit yield is ~25% higher than that predicted under the assumption of
circular orbits. Since the Kepler search for Earth-sized planets in the
habitable zone of a Solar-type star is limited by intrinsic variability, the
Kepler mission is expected to have a ~25% higher planet yield than that
predicted for circular orbits if the Earth-sized planets have an orbital
eccentricity distribution similar to the currently known Jupiter-mass planets.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 22:14:52 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Burke",
"Christopher J.",
""
]
] |
[
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] |
801.258 |
Juha Javanainen
|
Andrew Carmichael and Juha Javanainen
|
Mean-field stationary state of a Bose gas at a Feshbach resonance
| null | null |
10.1103/PhysRevA.77.043616
| null |
cond-mat.other
| null |
We study the steady state of a zero-temperature Bose gas near a Feshbach or
photoassociation resonance using a two-channel mean-field model that
incorporates atomic and molecular condensates, as well as correlated atom pairs
originating from dissociation of molecules into pairs of atoms. We start from a
many-body Hamiltonian for atom-molecule conversion, and derive the time
dependent version of the mean-field theory. The stationary solution of the time
dependent model is rendered unique with an approximation that entails that all
noncondensate atoms are correlated, as if emerging from dissociation of
molecules. The steady state is solved numerically, but limiting cases are also
found analytically. The system has a phase transition in which the atomic
condensate emerges in a nonanalytic fashion. We quantify the scaling of the
observable quantities, such as fractions of atomic and molecular condensates,
with the detuning and the atom-molecule conversion strength. Qualitatively, the
dependence on detuning rounds out with increasing coupling strength. A study of
the thermodynamics shows that the pressure of the atom-molecule system is
negative, even on the molecule side of the resonance. This indicates the
possibility of mechanical instability.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 22:29:12 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Carmichael",
"Andrew",
""
],
[
"Javanainen",
"Juha",
""
]
] |
[
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-0.0216063298,
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-0.0011217572,
0.0062272213
] |
801.2581 |
Massimo Porrati
|
M. Porrati and R. Rahman
|
Intrinsic Cutoff and Acausality for Massive Spin 2 Fields Coupled to
Electromagnetism
|
14 pages, to appear in Nuclear Physics B
|
Nucl.Phys.B801:174-186,2008
|
10.1016/j.nuclphysb.2008.05.013
| null |
hep-th
| null |
We couple a massive spin 2 particle to electromagnetism. By introducing new,
redundant degrees of freedom using the Stueckelberg formalism, we extract an
intrinsic, model independent UV cutoff of the effective field theory describing
this system. The cutoff signals both the onset of a strongly interacting
dynamical regime and a finite size for the spin 2 particle. We show that the
existence of a cutoff is strictly connected to other pathologies of interacting
high-spin fields, such as the Velo-Zwanziger acausality. We also briefly
comment on implications of this result for the detection of high spin states
and on its possible generalization to arbitrary spin.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 22:18:28 GMT"
},
{
"version": "v2",
"created": "Mon, 12 May 2008 19:16:03 GMT"
},
{
"version": "v3",
"created": "Mon, 26 May 2008 17:38:05 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Porrati",
"M.",
""
],
[
"Rahman",
"R.",
""
]
] |
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] |
801.2582 |
Lars Schewe
|
Lars Schewe
|
Non-Realizable Minimal Vertex Triangulations of Surfaces: Showing
Non-Realizability using Oriented Matroids and Satisfiability Solvers
|
14 pages
| null | null | null |
math.MG math.CO
| null |
We show that no minimal vertex triangulation of a closed, connected,
orientable 2-manifold of genus 6 admits a polyhedral embedding in R^3. We also
provide examples of minimal vertex triangulations of closed, connected,
orientable 2-manifolds of genus 5 that do not admit any polyhedral embeddings.
We construct a new infinite family of non-realizable triangulations of
surfaces. These results were achieved by transforming the problem of finding
suitable oriented matroids into a satisfiability problem. This method can be
applied to other geometric realizability problems, e.g. for face lattices of
polytopes.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 22:38:52 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Schewe",
"Lars",
""
]
] |
[
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] |
801.2583 |
Michael Scalora
|
Vito Roppo, Marco Centini, Domenico de Ceglia, Maria Antonietta
Vicenti, Joseph W. Haus, Neset Akozbek, Mark J. Bloemer, Michael Scalora
|
Anomalous Momentum States, Non-Specular Reflections, and Negative
Refraction of Phase-Locked, Second Harmonic Pulses
| null | null |
10.1016/j.metmat.2008.03.006
| null |
physics.optics
| null |
We simulate and discuss novel spatio-temporal propagation effects that relate
specifically to pulsed, phase-mismatched second harmonic generation in a
negative index material having finite length. Using a generic Drude model for
the dielectric permittivity and magnetic permeability, the fundamental and
second harmonic frequencies are tuned so that the respective indices of
refraction are negative for the pump and positive for the second harmonic
signal. A phase-locking mechanism causes part of the second harmonic signal
generated at the entry surface to become trapped and dragged along by the pump
and to refract negatively, even though the index of refraction at the second
harmonic frequency is positive. These circumstances culminate in the creation
of an anomalous state consisting of a forward-moving second harmonic wave
packet that has negative wave vector and momentum density, which in turn leads
to non-specular reflections at intervening material interfaces. The
forward-generated second harmonic signal trapped under the pump pulse
propagates forward, but has all the attributes of a reflected pulse, similar to
its twin counterpart generated at the surface and freely propagating backward
away from the interface. This describes a new state of negative refraction,
associated with nonlinear frequency conversion and parametric processes,
whereby a beam generated at the interface can refract negatively even though
the index of refraction at that wavelength is positive.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 22:30:15 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Roppo",
"Vito",
""
],
[
"Centini",
"Marco",
""
],
[
"de Ceglia",
"Domenico",
""
],
[
"Vicenti",
"Maria Antonietta",
""
],
[
"Haus",
"Joseph W.",
""
],
[
"Akozbek",
"Neset",
""
],
[
"Bloemer",
"Mark J.",
""
],
[
"Scalora",
"Michael",
""
]
] |
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] |
801.2584 |
Jenny Patience
|
J. Patience (1), R. T. Zavala (2), L. Prato (3), O. Franz (3), L.
Wasserman (3), C. Tycner (4), D. J. Hutter (2), C. A. Hummel (5) ((1)
University of Exeter, (2) U.S. Naval Observatory, Flagstaff Station, (3)
Lowell Observatory, (4) Central Michigan, (5) European Southern Observatory)
|
Optical interferometric observations of Theta 1 Orionis C from NPOI and
implications for the system orbit
|
13 pages, 2 tables, 3 figures. Accepted for publication in ApJL
| null |
10.1086/529041
| null |
astro-ph
| null |
With the Navy Prototype Optical Interferometer (NPOI), the binary system
Theta 1 Orionis C, the most massive member of the Trapezium, was spatially
resolved over a time period extending from February 2006 to March 2007. The
data show significant orbital motion over the 14 months, and, after combining
the NPOI data with previous measurements of the system from the literature, the
observations span 10 years of the orbit. Our results indicate that the
secondary did not experience an unusually close periastron passage this year,
in contradiction to the prediction of a recently published, highly eccentric
~11 year orbit. Future observations of this source will be required to improve
the orbital solution. Possible implications of the results in terms of system
distance are discussed, although a main conclusion of this work is that a
definitive orbit solution will require more time to obtain sufficient phase
coverage, and that the interaction effects expected at periastron did not occur
in 2007.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 22:30:32 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Patience",
"J.",
""
],
[
"Zavala",
"R. T.",
""
],
[
"Prato",
"L.",
""
],
[
"Franz",
"O.",
""
],
[
"Wasserman",
"L.",
""
],
[
"Tycner",
"C.",
""
],
[
"Hutter",
"D. J.",
""
],
[
"Hummel",
"C. A.",
""
]
] |
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-0.0347234346,
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-0.0425412022,
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] |
801.2585 |
William Sherry
|
W. H. Sherry, F. M. Walter, S. J. Wolk, N. R. Adams
|
Main-Seqence Fitting Distance to the sigma Ori Cluster
|
Accepted by AJ
| null |
10.1088/0004-6256/135/4/1616
| null |
astro-ph
| null |
The sigma Ori cluster is an unbound aggregate of a few hundred young,
low-mass stars centered on the multiple system sigma Ori. This cluster is of
great interest because it is at an age when roughly half of the stars have lost
their protoplanetary disks, and the cluster has a very large population of
brown dwarfs. One of the largest sources of uncertainty in the properties of
the cluster is that the distance is not well known. The directly measured
Hipparcos distance to sigma Ori AB is 350 (+120,-90) pc. On the other hand, the
distance to the Orion OB1b subgroup (of which sigma Ori is thought to be a
member), 473+/-40 pc, is far better determined, but it is an indirect estimate
of the cluster's distance. Also, Orion OB1b may have a depth of 40 pc along our
line of sight. We use main sequence fitting to 9 main sequence cluster members
to estimate a best fit distance of 420+/-30 pc, assuming a metallicity of
-0.16+/-0.11 or 444 pc assuming solar metallicity. A distance as close as 350
pc is inconsistent with the observed brightnesses of the cluster members. At
the best fit distance, the age of the cluster is 2-3 Myrs.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 22:41:20 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Sherry",
"W. H.",
""
],
[
"Walter",
"F. M.",
""
],
[
"Wolk",
"S. J.",
""
],
[
"Adams",
"N. R.",
""
]
] |
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] |
801.2586 |
Sankaran Viswanath
|
Sankaran Viswanath
|
Embeddings of hyperbolic Kac-Moody algebras into $\mathbf{E_{10}}$}
|
10 pages. to appear in Letters in Mathematical Physics
| null |
10.1007/s11005-007-0214-7
| null |
math.QA math-ph math.MP
| null |
We show that the rank 10 hyperbolic Kac-Moody algebra $E_{10}$ contains every
simply laced hyperbolic Kac-Moody algebra as a Lie subalgebra. Our method is
based on an extension of earlier work of Feingold and Nicolai.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 23:02:26 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Viswanath",
"Sankaran",
""
]
] |
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-0.0073026377,
0.0867732838,
-0.1333853155,
0.0576407686,
0.0278319586,
0.0146182813,
-0.0179086961,
-0.0167642031,
0.005715956,
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0.0581089705,
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-0.0311353784,
-0.0256730318,
-0.0052022352,
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0.0971257314,
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0.0548315607
] |
801.2587 |
Aleksandar Stojmirovi\'c
|
Aleksandar Stojmirovi\'c, E. Michael Gertz, Stephen F. Altschul and
Yi-Kuo Yu
|
The effectiveness of position- and composition-specific gap costs for
protein similarity searches
|
17 pages, 4 figures, 2 tables
|
Bioinformatics. 2008 Jul 1;24(13):i15-23.
|
10.1093/bioinformatics/btn171
| null |
q-bio.BM q-bio.QM
| null |
The flexibility in gap cost enjoyed by Hidden Markov Models (HMMs) is
expected to afford them better retrieval accuracy than position-specific
scoring matrices (PSSMs). We attempt to quantify the effect of more general gap
parameters by separately examining the influence of position- and
composition-specific gap scores, as well as by comparing the retrieval accuracy
of the PSSMs constructed using an iterative procedure to that of the HMMs
provided by Pfam and SUPERFAMILY, curated ensembles of multiple alignments.
We found that position-specific gap penalties have an advantage over uniform
gap costs. We did not explore optimizing distinct uniform gap costs for each
query. For Pfam, PSSMs iteratively constructed from seeds based on HMM
consensus sequences perform equivalently to HMMs that were adjusted to have
constant gap transition probabilities, albeit with much greater variance. We
observed no effect of composition-specific gap costs on retrieval performance.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 23:02:46 GMT"
}
] | 2008-10-31T00:00:00 |
[
[
"Stojmirović",
"Aleksandar",
""
],
[
"Gertz",
"E. Michael",
""
],
[
"Altschul",
"Stephen F.",
""
],
[
"Yu",
"Yi-Kuo",
""
]
] |
[
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] |
801.2588 |
K. Raj Kumar
|
K. Raj Kumar and Giuseppe Caire
|
Coding and Decoding for the Dynamic Decode and Forward Relay Protocol
|
Submitted to the IEEE Transactions on Information Theory
| null | null | null |
cs.IT math.IT
| null |
We study the Dynamic Decode and Forward (DDF) protocol for a single
half-duplex relay, single-antenna channel with quasi-static fading. The DDF
protocol is well-known and has been analyzed in terms of the
Diversity-Multiplexing Tradeoff (DMT) in the infinite block length limit. We
characterize the finite block length DMT and give new explicit code
constructions. The finite block length analysis illuminates a few key aspects
that have been neglected in the previous literature: 1) we show that one
dominating cause of degradation with respect to the infinite block length
regime is the event of decoding error at the relay; 2) we explicitly take into
account the fact that the destination does not generally know a priori the
relay decision time at which the relay switches from listening to transmit
mode. Both the above problems can be tackled by a careful design of the
decoding algorithm. In particular, we introduce a decision rejection criterion
at the relay based on Forney's decision rule (a variant of the Neyman-Pearson
rule), such that the relay triggers transmission only when its decision is
reliable. Also, we show that a receiver based on the Generalized Likelihood
Ratio Test rule that jointly decodes the relay decision time and the
information message achieves the optimal DMT. Our results show that no cyclic
redundancy check (CRC) for error detection or additional protocol overhead to
communicate the decision time are needed for DDF. Finally, we investigate the
use of minimum mean squared error generalized decision feedback equalizer
(MMSE-GDFE) lattice decoding at both the relay and the destination, and show
that it provides near optimal performance at moderate complexity.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 23:05:12 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Kumar",
"K. Raj",
""
],
[
"Caire",
"Giuseppe",
""
]
] |
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] |
801.2589 |
Joris Verbiest
|
J.P.W. Verbiest, M. Bailes, W. van Straten, G.B. Hobbs, R.T. Edwards,
R.N. Manchester, N.D.R. Bhat, J.M. Sarkissian, B.A. Jacoby and S.R. Kulkarni
|
Precision timing of PSR J0437-4715: an accurate pulsar distance, a high
pulsar mass and a limit on the variation of Newton's gravitational constant
|
19 pages, 4 figures, accepted for publication in The Astrophysical
Journal
|
The Astrophysical Journal, Volume 679, Issue 1, pp. 675-680 (2008)
|
10.1086/529576
| null |
astro-ph
| null |
Analysis of ten years of high-precision timing data on the millisecond pulsar
PSR J0437-4715 has resulted in a model-independent kinematic distance based on
an apparent orbital period derivative, Pbdot, determined at the 1.5% level of
precision (Dk = 157.0 +/- 2.4 pc), making it one of the most accurate stellar
distance estimates published to date. The discrepancy between this measurement
and a previously published parallax distance estimate is attributed to errors
in the DE200 Solar System ephemerides. The precise measurement of Pbdot allows
a limit on the variation of Newton's gravitational constant, |Gdot/G| < 23 x
10^{-12} 1/yr. We also constrain any anomalous acceleration along the line of
sight to the pulsar to |a(Sun)/c| < 1.5 x 10^{-18} 1/s at 95% confidence, and
derive a pulsar mass, m(psr) = 1.76 +/- 0.20 M, one of the highest estimates so
far obtained.
|
[
{
"version": "v1",
"created": "Wed, 16 Jan 2008 23:09:14 GMT"
},
{
"version": "v2",
"created": "Wed, 13 Feb 2008 04:24:57 GMT"
}
] | 2012-10-03T00:00:00 |
[
[
"Verbiest",
"J. P. W.",
""
],
[
"Bailes",
"M.",
""
],
[
"van Straten",
"W.",
""
],
[
"Hobbs",
"G. B.",
""
],
[
"Edwards",
"R. T.",
""
],
[
"Manchester",
"R. N.",
""
],
[
"Bhat",
"N. D. R.",
""
],
[
"Sarkissian",
"J. M.",
""
],
[
"Jacoby",
"B. A.",
""
],
[
"Kulkarni",
"S. R.",
""
]
] |
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-0.0387669615,
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] |
801.259 |
Francois Berteloot
|
G. Bassanelli and F. Berteloot
|
Lyapunov exponents, bifurcation currents and laminations in bifurcation
loci
| null | null | null | null |
math.CV math.DS
| null |
Bifurcation loci in the moduli space of degree $d$ rational maps are shaped
by the hypersurfaces defined by the existence of a cycle of period $n$ and
multiplier 0 or $e^{i\theta}$. Using potential-theoretic arguments, we
establish two equidistribution properties for these hypersurfaces with respect
to the bifurcation current. To this purpose we first establish approximation
formulas for the Lyapunov function. In degree $d=2$, this allows us to build
holomorphic motions and show that the bifurcation locus has a lamination
structure in the regions where an attracting basin of fixed period exists.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 14:18:09 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Bassanelli",
"G.",
""
],
[
"Berteloot",
"F.",
""
]
] |
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] |
801.2591 |
Eric B. Ford
|
Eric B. Ford, Samuel N. Quinn, Dimitri Veras
|
Characterizing the Orbital Eccentricities of Transiting Extrasolar
Planets with Photometric Observations
|
32 pages, 10 figures, accepted to ApJ
|
ApJ (2008) 678, 1407-1418.
|
10.1086/587046
| null |
astro-ph
| null |
The discovery of over 200 extrasolar planets with the radial velocity (RV)
technique has revealed that many giant planets have large eccentricities, in
striking contrast with most of the planets in the solar system and prior
theories of planet formation. The realization that many giant planets have
large eccentricities raises a fundamental question: ``Do terrestrial-size
planets of other stars typically have significantly eccentric orbits or nearly
circular orbits like the Earth?'' Here, we demonstrate that photometric
observations of transiting planets could be used to characterize the orbital
eccentricities for individual transiting planets, as well the eccentricity
distribution for various populations of transiting planets (e.g., those with a
certain range of orbital periods or physical sizes). Such characterizations can
provide valuable constraints on theories for the excitation of eccentricities
and tidal dissipation. We outline the future prospects of the technique given
the exciting prospects for future transit searches, such as those to be carried
out by the CoRoT and Kepler missions.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 17:06:16 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Feb 2008 08:38:36 GMT"
}
] | 2008-12-10T00:00:00 |
[
[
"Ford",
"Eric B.",
""
],
[
"Quinn",
"Samuel N.",
""
],
[
"Veras",
"Dimitri",
""
]
] |
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] |
801.2592 |
Jacob Krich
|
Jacob J. Krich and Bertrand I. Halperin
|
Spin polarized current generation from quantum dots without magnetic
fields
|
7 pages, 3 figures. Revised version with reference to Bardarson,
Adagideli, and Jacquod, Phys Rev Lett 98, 196601 (2007), who performed an
analogous calculation in a different geometry
| null |
10.1103/PhysRevB.78.035338
| null |
cond-mat.mes-hall
| null |
An unpolarized charge current passing through a chaotic quantum dot with
spin-orbit coupling can produce a spin polarized exit current without magnetic
fields or ferromagnets. We use random matrix theory to estimate the typical
spin polarization as a function of the number of channels in each lead in the
limit of large spin-orbit coupling. We find rms spin polarizations up to 45%
with one input channel and two output channels. Finite temperature and
dephasing both suppress the effect, and we include dephasing effects using a
new variation of the third lead model. If there is only one channel in the
output lead, no spin polarization can be produced, but we show that dephasing
lifts this restriction.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 00:05:10 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 00:37:07 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Krich",
"Jacob J.",
""
],
[
"Halperin",
"Bertrand I.",
""
]
] |
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] |
801.2593 |
Sebastian George
|
S. George, G. Audi, B. Blank, K. Blaum, M. Breitenfeldt, U. Hager, F.
Herfurth, A. Herlert, A. Kellerbauer, H.-J. Kluge, M. Kretzschmar, D. Lunney,
R. Savreux, S. Schwarz, L. Schweikhard and C. Yazidjian
|
Time-separated oscillatory fields for high-precision mass measurements
on short-lived Al and Ca nuclides
|
7 pages, 9 figures
|
Europhys.Lett.82:50005,2008
|
10.1209/0295-5075/82/50005
| null |
nucl-ex
| null |
High-precision Penning trap mass measurements on the stable nuclide 27Al as
well as on the short-lived radionuclides 26Al and 38,39Ca have been performed
by use of radiofrequency excitation with time-separated oscillatory fields,
i.e. Ramsey's method, as recently introduced for the excitation of the ion
motion in a Penning trap, was applied. A comparison with the conventional
method of a single continuous excitation demonstrates its advantage of up to
ten times shorter measurements. The new mass values of 26,27Al clarify
conflicting data in this specific mass region. In addition, the resulting mass
values of the superallowed beta-emitter 38Ca as well as of the groundstate of
the beta-emitter 26Al m confirm previous measurements and corresponding
theoretical corrections of the ft-values.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 09:44:07 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"George",
"S.",
""
],
[
"Audi",
"G.",
""
],
[
"Blank",
"B.",
""
],
[
"Blaum",
"K.",
""
],
[
"Breitenfeldt",
"M.",
""
],
[
"Hager",
"U.",
""
],
[
"Herfurth",
"F.",
""
],
[
"Herlert",
"A.",
""
],
[
"Kellerbauer",
"A.",
""
],
[
"Kluge",
"H. -J.",
""
],
[
"Kretzschmar",
"M.",
""
],
[
"Lunney",
"D.",
""
],
[
"Savreux",
"R.",
""
],
[
"Schwarz",
"S.",
""
],
[
"Schweikhard",
"L.",
""
],
[
"Yazidjian",
"C.",
""
]
] |
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] |
801.2594 |
David Clark
|
D. M. Clark, S. S. Eikenberry, B. R. Brandl, J. C. Wilson, J. C.
Carson, C. P. Henderson, T. L. Hayward, D. J. Barry, A. F. Ptak, E. J. M.
Colbert
|
A First Estimate Of The X-Ray Binary Frequency As A Function Of Star
Cluster Mass In A Single Galactic System
|
20 pages, 6 figures, accepted by ApJ
| null |
10.1086/529571
| null |
astro-ph
| null |
We use the previously-identified 15 infrared star-cluster counterparts to
X-ray point sources in the interacting galaxies NGC 4038/4039 (the Antennae) to
study the relationship between total cluster mass and X-ray binary number. This
significant population of X-Ray/IR associations allows us to perform, for the
first time, a statistical study of X-ray point sources and their environments.
We define a quantity, \eta, relating the fraction of X-ray sources per unit
mass as a function of cluster mass in the Antennae. We compute cluster mass by
fitting spectral evolutionary models to K_s luminosity. Considering that this
method depends on cluster age, we use four different age distributions to
explore the effects of cluster age on the value of \eta and find it varies by
less than a factor of four. We find a mean value of \eta for these different
distributions of \eta = 1.7 x 10^-8 M_\sun^-1 with \sigma_\eta = 1.2 x 10^-8
M_\sun^-1. Performing a \chi^2 test, we demonstrate \eta could exhibit a
positive slope, but that it depends on the assumed distribution in cluster
ages. While the estimated uncertainties in \eta are factors of a few, we
believe this is the first estimate made of this quantity to ``order of
magnitude'' accuracy. We also compare our findings to theoretical models of
open and globular cluster evolution, incorporating the X-ray binary fraction
per cluster.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 00:34:17 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Clark",
"D. M.",
""
],
[
"Eikenberry",
"S. S.",
""
],
[
"Brandl",
"B. R.",
""
],
[
"Wilson",
"J. C.",
""
],
[
"Carson",
"J. C.",
""
],
[
"Henderson",
"C. P.",
""
],
[
"Hayward",
"T. L.",
""
],
[
"Barry",
"D. J.",
""
],
[
"Ptak",
"A. F.",
""
],
[
"Colbert",
"E. J. M.",
""
]
] |
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-0.0190598015,
0.006781715,
-0.0677192211,
0.0307503045,
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-0.005741199,
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0.0142856706,
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0.0045293043
] |
801.2595 |
James Di Francesco
|
James Di Francesco, Doug Johnstone, Helen Kirk, Todd MacKenzie,
Elizabeth Ledwosinska
|
The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
|
41 pages, 17 figures in JPEG format; to be published in ApJS
| null |
10.1086/523645
| null |
astro-ph
| null |
We present the SCUBA Legacy Catalogues, two comprehensive sets of continuum
maps (and catalogues) using data at 850 microns and 450 microns of the various
astronomical objects obtained with the Submillimetre Common User Bolometer
Array (SCUBA). The Fundamental Map Dataset contains data only where superior
atmospheric opacity calibration data were available. The Extended Map Dataset
is comprised of data regardless of the quality of the opacity calibration. Each
Dataset contains 1.2 degree x 1.2 degree maps at locations where data existed
in the JCMT archive, imaged using the matrix inversion method. The Fundamental
Dataset is comprised of 1423 maps at 850 microns and 1357 maps at 450 microns.
The Extended Dataset is comprised of 1547 maps at 850 microns. Neither Dataset
includes high sensitivity, single chop SCUBA maps of "cosmological fields" nor
solar system objects. Each Dataset was used to determine a respective Object
Catalogue, consisting of objects identified within the respective 850 micron
maps using an automated identification algorithm. The Fundamental and Extended
Map Object Catalogues contain 5061 and 6118 objects respectively. Objects are
named based on their respective J2000 position of peak 850 micron intensity.
The Catalogues provide for each object the respective maximum 850 micron
intensity, estimates of total 850 micron flux and size, and tentative
identifications from the SIMBAD Database. Where possible, the Catalogues als
provide for each object its maximum 450 micron intensity and total 450 micron
flux, and flux ratios. Data products, machine-readable tables and a full
version of the paper can be retrieved at
http://www.cadc.hia.nrc.gc.ca/community/scubalegacy .
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 17:06:50 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jan 2008 00:45:55 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Di Francesco",
"James",
""
],
[
"Johnstone",
"Doug",
""
],
[
"Kirk",
"Helen",
""
],
[
"MacKenzie",
"Todd",
""
],
[
"Ledwosinska",
"Elizabeth",
""
]
] |
[
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] |
801.2596 |
Ci Zhuang
|
Shou-Shan Bao, Fang Su, Yue-Liang Wu, Ci Zhuang
|
Exclusive $B \to VV $ Decays and CP Violation in the General
two-Higgs-doublet Model
|
17 pages, no figures
|
Phys.Rev.D77:095004,2008
|
10.1103/PhysRevD.77.095004
| null |
hep-ph
| null |
Using the general factorization approach, we present a detailed investigation
for the branching ratios, CP asymmetries and longitudinal polarization
fractions in all charmless hadronic $B \to VV$ decays (except for the pure
annihilation processes) within the most general two-Higgs-doublet model with
spontaneous CP violation. It is seen that such a new physics model only has
very small contributions to the branching ratios and longitudinal polarization
fractions. However, as the model has rich CP-violating sources, it can lead to
significant effects on the CP asymmetries, especially on those of
penguin-dominated decay modes, which provides good signals for probing new
physics beyond the SM in the future B-physics experiments.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 01:16:11 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 02:02:40 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Bao",
"Shou-Shan",
""
],
[
"Su",
"Fang",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhuang",
"Ci",
""
]
] |
[
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] |
801.2597 |
Steve Butler
|
Steve Butler, Ron Graham
|
Enumerating (multiplex) juggling sequences
|
13 pages; 3 figures; to appear in Annals of Combinatorics
| null | null | null |
math.CO
| null |
We consider the problem of enumerating periodic $\sigma$-juggling sequences
of length $n$ for multiplex juggling, where $\sigma$ is the initial state (or
{\em landing schedule}) of the balls. We first show that this problem is
equivalent to choosing 1's in a specified matrix to guarantee certain column
and row sums, and then using this matrix, derive a recursion. This work is a
generalization of earlier work of Fan Chung and Ron Graham.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 01:18:00 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Butler",
"Steve",
""
],
[
"Graham",
"Ron",
""
]
] |
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] |
801.2598 |
Yuan Liu
|
Yuan Liu, Shuang Nan Zhang
|
Is the anti-correlation between the X-ray variability amplitude and
black hole mass of AGNs intrinsic?
|
3 pages, 3 figures, 2 tables, accepted for publication in A&A
(Research Note)
| null |
10.1051/0004-6361:20078282
| null |
astro-ph
| null |
Aims. Both the black hole mass and the X-ray luminosity of AGNs have been
found to be anti-correlated with the normalized excess variance ($\sigma_{\rm
rms}^2 $) of the X-ray light curves. We investigate which correlation with
$\sigma_{\rm rms}^2 $ is the intrinsic one.
Methods. We divide a full sample of 33 AGNs (O' Neill et al. 2005) into two
sub-samples. The black hole masses of 17 objects in sub-sample 1 were
determined by the reverberation mapping or the stellar velocity dispersion. The
black hole masses of the remaining 16 objects were estimated from the
relationship between broad line region radius and optical luminosity
(sub-sample 2). Then partial correlation analysis, ordinary least squares
regression and K-S tests are performed on the full sample and the sub-samples,
respectively.
Results. We find that $\sigma_{\rm rms}^2 $ seems to be intrinsically
correlated with the black hole mass in the full sample. However, this seems to
be caused by including the sub-sample 2 into the analysis, which introduces an
extra correlation between the black hole mass and the luminosity and
strengthens any correlation with the black hole mass artificially. Therefore,
the results from the full sample may be misleading. The results from the
sub-sample 1 show that the correlation between $\sigma_{\rm rms}^2 $ and the
X-ray luminosity may be the intrinsic one and therefore the anti-correlation
between $\sigma_{\rm rms}^2 $ and the black hole mass is doubtful.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 02:00:10 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Liu",
"Yuan",
""
],
[
"Zhang",
"Shuang Nan",
""
]
] |
[
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] |
801.2599 |
Matthew Ballard
|
Matthew Robert Ballard
|
Derived categories of sheaves on singular schemes with an application to
reconstruction
|
23 pages. Final version although comments and suggestions are always
welcome
|
Advances in Mathematics, Volume 227, Issue 2, 1 June 2011, Pages
895-919
| null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We prove that the bounded derived category of coherent sheaves with proper
support is equivalent to the category of locally-finite, cohomological functors
on the perfect derived category of a quasi-projective scheme over a field. We
introduce the notions of pseudo-adjoints and Rouquier functors and study them.
As an application of these ideas and results, we extend the reconstruction
result of Bondal and Orlov to Gorenstein projective varieties.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 01:42:12 GMT"
},
{
"version": "v2",
"created": "Tue, 19 May 2009 17:31:24 GMT"
},
{
"version": "v3",
"created": "Tue, 17 May 2011 17:01:49 GMT"
}
] | 2011-05-18T00:00:00 |
[
[
"Ballard",
"Matthew Robert",
""
]
] |
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] |
801.26 |
Shota Gugushvili
|
Bert van Es and Shota Gugushvili
|
Some thoughts on the asymptotics of the deconvolution kernel density
estimator
|
18 pages, 8 figures, 6 tables
| null | null | null |
stat.ME
| null |
Via a simulation study we compare the finite sample performance of the
deconvolution kernel density estimator in the supersmooth deconvolution problem
to its asymptotic behaviour predicted by two asymptotic normality theorems. Our
results indicate that for lower noise levels and moderate sample sizes the
match between the asymptotic theory and the finite sample performance of the
estimator is not satisfactory. On the other hand we show that the two
approaches produce reasonably close results for higher noise levels. These
observations in turn provide additional motivation for the study of
deconvolution problems under the assumption that the error term variance
$\sigma^2\to 0$ as the sample size $n\to\infty.$
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 02:12:17 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"van Es",
"Bert",
""
],
[
"Gugushvili",
"Shota",
""
]
] |
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] |
801.2601 |
Dong Liu
|
Dong Liu and Linsheng Zhu
|
Classification of Harish-Chandra modules over the $W$-algebra W(2,2)
|
Latex, 20 pages
| null | null | null |
math.RT math.QA
| null |
In this paper, we classify all irreducible weight modules with finite
dimensional weight spaces over the $W$-algebra $W(2, 2)$. Meanwhile, all
indecomposable modules with one dimensional weight spaces over the $W$-algebra
$W(2, 2)$ are also determined.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:18:48 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 01:51:02 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Liu",
"Dong",
""
],
[
"Zhu",
"Linsheng",
""
]
] |
[
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] |
801.2602 |
Oleg Kargaltsev
|
O. Kargaltsev, G. G. Pavlov
|
Pulsar Wind Nebulae in the Chandra Era
|
15 pages, 5 tables, 10 figures. To appear in the proceedings of "40
Years of Pulsars: Millisecond Pulsars, Magnetars, and More", August 12-17,
2007, McGill University, Montreal, Canada. Corrected typos in Table 1
|
AIP Conf.Proc.983:171-185,2008
|
10.1063/1.2900138
| null |
astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Pulsar winds shocked in the ambient medium produce spectacular nebulae
observable from the radio through gamma-rays. The shape and the spectrum of a
pulsar wind nebula (PWN) depend on the angular distribution, magnetization and
energy spectrum of the wind streaming from the pulsar magnetosphere, as well as
on the pulsar velocity and the properties of the ambient medium. The advent of
Chandra, with its unprecedented angular resolution and high sensitivity, has
allowed us not only to detect many new PWNe, but also study their spatial and
spectral structure and dynamics, which has significantly advanced our
understanding of these objects. Here we overview recent observational results
on PWNe, with emphasis on Chandra observations.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:45:37 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Jun 2009 22:26:34 GMT"
}
] | 2009-09-29T00:00:00 |
[
[
"Kargaltsev",
"O.",
""
],
[
"Pavlov",
"G. G.",
""
]
] |
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0.0317893215,
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] |
801.2603 |
Dong Liu
|
Dong Liu, Shoulan Gao, Linsheng Zhu
|
Classification of irreducible weight modules over $W$-algebra W(2,2)
|
10 pages
|
published in J. Math. Phys. 49(11)(2008)
|
10.1063/1.2996291
| null |
math.RT math.QA
| null |
We show that the support of an irreducible weight module over the $W$-algebra
$W(2, 2)$, which has an infinite dimensional weight space, coincides with the
weight lattice and that all nontrivial weight spaces of such a module are
infinite dimensional. As a corollary, we obtain that every irreducible weight
module over the the $W$-algebra $W(2, 2)$, having a nontrivial finite
dimensional weight space, is a Harish-Chandra module (and hence is either an
irreducible highest or lowest weight module or an irreducible module of the
intermediate series).
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:28:34 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 01:47:01 GMT"
}
] | 2010-07-26T00:00:00 |
[
[
"Liu",
"Dong",
""
],
[
"Gao",
"Shoulan",
""
],
[
"Zhu",
"Linsheng",
""
]
] |
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] |
801.2604 |
Deyan Sun
|
Y. Yang and D. Y. Sun
|
Effect of the equilibrium pair separation on cluster structures
| null |
Communications in Computational Physics 6(4), 730 (2009)
|
10.4208/cicp.2009.v6.p730
| null |
cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A simple pair potential, which equilibrium pair separation can be varied
under a fixed interaction range, has been proposed. The new potential can make
both face-centered-cubic(fcc) and body-centered-cubic(bcc) structure stable by
simply changing one parameter. To investigate the general effect of the
potential shape on cluster structures, the evolution of cluster structures is
calculated for different equilibrium pair separations. The small size
clusters($N<25$), which adopt the polytetrahedra, are almost independent on the
details of the potential. For the large size clusters($25<N<150$), the
potential with large equilibrium pair separation trends to stable decahedra and
close-packed structure, disordered clusters appear for the potential with small
equilibrium pair separation, while for the middle range of equilibrium pair
separation, the icosahedra are dominated.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:31:55 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jul 2008 08:20:52 GMT"
}
] | 2015-05-13T00:00:00 |
[
[
"Yang",
"Y.",
""
],
[
"Sun",
"D. Y.",
""
]
] |
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] |
801.2605 |
Ryoichi Kobayashi
|
Ryoichi Kobayashi
|
Ricci flow unstable cell centered at an Einstein metric on the twistor
space of positive quaternion K\"ahler manifolds of dimension $\geq 8$
|
52 pages
| null | null | null |
math.DG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a 1-parameter family Ricci flow ancient solutions arises from
the natural collapsings of the twistor space of positive quaternion K\"ahler
manifolds. We use these ancient solutions to show that a positive quaternion
K\"ahler manifold is isometric to one of the Wolf spaces.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:32:35 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jan 2008 04:58:26 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Feb 2008 07:27:43 GMT"
},
{
"version": "v4",
"created": "Mon, 17 Mar 2008 10:04:43 GMT"
},
{
"version": "v5",
"created": "Fri, 28 Mar 2008 08:44:25 GMT"
},
{
"version": "v6",
"created": "Tue, 8 Apr 2008 00:41:05 GMT"
},
{
"version": "v7",
"created": "Tue, 14 Oct 2008 04:27:17 GMT"
}
] | 2008-10-14T00:00:00 |
[
[
"Kobayashi",
"Ryoichi",
""
]
] |
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] |
801.2606 |
Kim Fook Lee
|
Kim Fook Lee, Prem Kumar, Jay E. Sharping, Mark A. Foster, Alexander
L. Gaeta, Amy C. Turner, and Michal Lipson
|
Telecom-Band Entanglement Generation for Chipscale Quantum Processing
|
9 pages, 3 figures
| null | null | null |
quant-ph
| null |
We demonstrate polarization-entanglement for non-degenerate and degenerate
photon-pairs generated through Kerr-nonlinearity in a nano-scale
silicon-on-insulator(SOI) waveguide. We use a compact counter propagating
configuration to create two-photon polarization-entangled state, |H>|H> +
|V>|V>. We observe two-photon interference with visibility > 91% and > 80% for
non-degenerate and degenerate photon-pairs, respectively. The experimental
structure can be implemented on optical chips as an integrated source of
entangled photons for future quantum computer and communication applications.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:35:36 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Lee",
"Kim Fook",
""
],
[
"Kumar",
"Prem",
""
],
[
"Sharping",
"Jay E.",
""
],
[
"Foster",
"Mark A.",
""
],
[
"Gaeta",
"Alexander L.",
""
],
[
"Turner",
"Amy C.",
""
],
[
"Lipson",
"Michal",
""
]
] |
[
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] |
801.2607 |
Teruki Motohashi
|
T. Motohashi, T. Ono, Y. Katsumata, R. Kanno, M. Karppinen, H.
Yamauchi
|
Electrochemical synthesis and properties of CoO2, the x = 0 phase of the
AxCoO2 systems (A = Li, Na)
|
12 pages, 3 figures
|
Journal of Applied Physics 103, 07C902 (2008)
|
10.1063/1.2828525
| null |
cond-mat.str-el cond-mat.mtrl-sci
| null |
Single-phase bulk samples of the "exotic" CoO2, the x = 0 phase of the AxCoO2
systems (A = Li, Na), were successfully synthesized through electrochemical
de-intercalation of Li from pristine LiCoO2 samples. The samples of pure CoO2
were found to be essentially oxygen stoichiometric and possess a hexagonal
structure consisting of stacked triangular-lattice CoO2 layers only. The
magnetism of CoO2 is featured with a temperature-independent susceptibility of
the magnitude of 10-3 emu/mol Oe, being essentially identical to that of a
Li-doped phase, Li0.12CoO2. It is most likely that the CoO2 phase is a
Pauli-paramagnetic metal with itinerant electrons.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:36:43 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Motohashi",
"T.",
""
],
[
"Ono",
"T.",
""
],
[
"Katsumata",
"Y.",
""
],
[
"Kanno",
"R.",
""
],
[
"Karppinen",
"M.",
""
],
[
"Yamauchi",
"H.",
""
]
] |
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0.0155829079,
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-0.0708579123,
-0.0610751249,
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-0.0462663136,
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0.0098444931,
-0.0147863729,
-0.0313004404,
-0.0908722505,
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0.071665667,
-0.0152351251,
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-0.0191841405,
0.06103025,
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-0.0078812046,
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0.0215064324,
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-0.0402081646,
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] |
801.2608 |
Jesse Fern
|
Jesse Fern
|
An upper bound on quantum fault tolerant thresholds
|
16 pages, REVTex4, 8 QCircuit figures, 1 other figure, minor
revisions
| null | null | null |
quant-ph
| null |
In this paper we calculate upper bounds on fault tolerance, without
restrictions on the overhead involved. Optimally adaptive recovery operators
are used, and the Shannon entropy is used to estimate the thresholds. By
allowing for unrealistically high levels of overhead, we find a quantum fault
tolerant threshold of 6.88% for the depolarizing noise used by Knill, which
compares well to "above 3%" evidenced by Knill. We conjecture that the optimal
threshold is 6.90%, based upon the hashing rate. We also perform threshold
calculations for types of noise other than that discussed by Knill.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 04:23:10 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 22:07:28 GMT"
}
] | 2008-05-06T00:00:00 |
[
[
"Fern",
"Jesse",
""
]
] |
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-0.0373505391,
0.0655665845,
0.0555914976,
-0.0110258339,
0.0547509007,
-0.0024832643,
0.0546388216,
-0.0329794325,
0.0602428019,
0.019683985,
0.0936985761,
0.0248956885,
0.0247695986,
-0.016293576,
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0.0619800389,
-0.0032292944,
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-0.0914569795,
-0.0902241021,
-0.0954918489,
-0.05833745,
0.0472976044,
-0.0041539515,
-0.0610834025,
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0.0409090668,
-0.002502528,
-0.0758779123,
-0.0596824065
] |
801.2609 |
Feng-Wen An
|
Feng-Wen An
|
The Combinatorial Norm of a Morphism of Schemes
|
A completely rewritten version of math.AG/0509587, with a better
exposition. 17 pages
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we will prove that there exists a covariant functor from the
category of schemes to the category of graphs. This functor provides a
combination between algebraic varieties and combinatorial graphs so that the
invariants defined on graphs can be introduced to algebraic varieties in a
natural manner. By the functor, we will define the combinatorial norm of a
morphism of schemes. Then we will obtain some properties of morphisms of norm
not great than one. The topics discussed here can be applied to study the
discrete Morse theory on arithmetic schemes and Kontsevich's theory of graph
homology.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:53:56 GMT"
},
{
"version": "v2",
"created": "Sun, 5 Jul 2009 10:47:16 GMT"
}
] | 2009-07-06T00:00:00 |
[
[
"An",
"Feng-Wen",
""
]
] |
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] |
801.261 |
Martin Willensdorfer
|
Martin Willensdorfer
|
On the evolution of differentiated multicellularity
| null | null | null | null |
q-bio.PE
| null |
Most conspicuous organisms are multicellular and most multicellular organisms
develop somatic cells to perform specific, non-reproductive tasks. The ubiquity
of this division of labor suggests that it is highly advantageous. In this
paper, I present a model to study the evolution of specialized cells. The model
allows for unicellular and multicellular organisms that may contain somatic
(terminally differentiated) cells. Cells contribute additively to a
quantitative trait. The fitness of the organism depends on this quantitative
trait (via a benefit function), the size of the organism, and the number of
somatic cells. This model allows one to determine when somatic cells are
advantageous and to calculate the optimum number (or fraction) of reproductive
cells. I show that the fraction of reproductive cells is always surprisingly
high. If somatic cells are very small they can outnumber reproductive cells but
their biomass is still less than the biomass of reproductive cells. Only for
convex benefit functions can the biomass of somatic cell exceed the biomass of
reproductive cells. I discuss the biology of primitive multicellular organisms
with respect to the model predictions. I find good agreement and outline how
this work can be used to guide further quantitative studies of
multicellularity.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:54:21 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Willensdorfer",
"Martin",
""
]
] |
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] |
801.2611 |
Frank Sottile
|
Frank Sottile
|
General isotropic flags are general (for Grassmannian Schubert calculus)
|
3 pages
| null | null | null |
math.AG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that general isotropic flags for odd-orthogonal and symplectic groups
are general for Schubert calculus on the classical Grassmannian in that
Schubert cells defined by such flags meet transversally. This strengthens a
result of Belkale and Kumar in arXiv:0708.0398.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 03:57:04 GMT"
},
{
"version": "v2",
"created": "Mon, 21 Jul 2008 19:33:46 GMT"
}
] | 2008-07-21T00:00:00 |
[
[
"Sottile",
"Frank",
""
]
] |
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] |
801.2612 |
Enrique Gonz\'alez-Tovar
|
G. I. Guerrero-Garc\'ia (1 and 2), E. Gonz\'alez-Tovar (1), M.
Ch\'avez-P\'aez (1) and Marcelo Lozada-Cassou (2) ((1) Instituto de F\'isica,
Universidad Aut\'onoma de San Luis Potos\'i, M\'exico, (2) Programa de
Ingenier\'ia Molecular, Instituto Mexicano del Petr\'oleo, M\'exico)
|
Overcharging and charge reversal in the electrical double layer near the
point of zero charge
|
v1 29 pages, 15 figures, v2 30 pages, 15 figures, typos and
references added
| null | null | null |
cond-mat.soft cond-mat.stat-mech
| null |
The ionic adsorption around a weakly charged spherical colloid, immersed in
size-asymmetric 1:1 and 2:2 salts, is studied. We use the primitive model of an
electrolyte to perform Monte Carlo simulations as well as theoretical
calculations by means of the hypernetted chain/mean spherical approximation
(HNC/MSA) and the unequal-radius modified Gouy-Chapman (URMGC) integral
equations. Structural quantities such as the radial distribution functions, the
integrated charge, and the mean electrostatic potential are reported. Our Monte
Carlo "experiments" evidence that near the point of zero charge the smallest
ionic species is preferentially adsorbed onto the macroparticle, independently
of the sign of the charge carried by this tiniest electrolytic component,
giving rise to the appearance of the phenomena of charge reversal and
overcharging. Accordingly, charge reversal is observed when the macroion is
slightly charged and the coions are larger than the counterions. In the
opposite situation, i.e. if the counterions are larger than the coions,
overcharging occurs. In other words, in this paper we present the first
simulational data on overcharging, showing that this novel effect surges close
to the point of zero charge as a consequence of the ionic size asymmetry.
Further, it is seen that the inclusion of hard-core correlations in HNC/MSA
leads to spatial regions near the macroion's surface in which the integrated
charge and/or the mean electrostatic potential can decrease when the colloidal
charge is augmented and vice versa. These observations aware about the
interpretation of electrophoretic mobility measurements using the standard
Poisson-Boltzmann approximation beyond its validity region.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 04:04:45 GMT"
},
{
"version": "v2",
"created": "Sat, 29 Mar 2008 01:01:39 GMT"
}
] | 2008-03-29T00:00:00 |
[
[
"Guerrero-García",
"G. I.",
"",
"1 and 2"
],
[
"González-Tovar",
"E.",
""
],
[
"Chávez-Páez",
"M.",
""
],
[
"Lozada-Cassou",
"Marcelo",
""
]
] |
[
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] |
801.2613 |
Sebastien Muller
|
Sebastien Muller, Szu-Ying Wu, Bau-Ching Hsieh (ASIAA, Taiwan), Rosa
Gonzalez, Laurent Loinard (CRyA-UNAM, Mexico), Howard Yee (Univ. Toronto,
Canada), Mike Gladders (Univ. Chicago, USA)
|
Searching for dust in the intracluster medium from reddening of
background galaxies
|
accepted for publication in ApJ
| null |
10.1086/529583
| null |
astro-ph
| null |
We report a search for the presence of dust in the intra-cluster medium based
on the study of statistical reddening of background galaxies. Armed with the
Red Sequence Cluster survey data, from which we extracted (i) a catalog of 458
clusters with z_clust < 0.5 and (ii) a catalog of ~90,000 galaxies with
photometric redshift 0.5 < z_ph < 0.8 and photometric redshift uncertainty
delta z_ph / (1+z_ph) < 0.06, we have constructed several samples of galaxies
according to their projected distances to the cluster centers. No significant
color differences [<E(B-R_c)> = 0.005 pm 0.008, and <E(V-z')> = 0.000 pm 0.008]
were found for galaxies background to the clusters, compared to the references.
Assuming a Galactic extinction law, we derive an average visual extinction of
<A_V> = 0.004 pm 0.010 towards the inner 1x R_200 of clusters.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 04:17:24 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Muller",
"Sebastien",
"",
"ASIAA, Taiwan"
],
[
"Wu",
"Szu-Ying",
"",
"ASIAA, Taiwan"
],
[
"Hsieh",
"Bau-Ching",
"",
"ASIAA, Taiwan"
],
[
"Gonzalez",
"Rosa",
"",
"CRyA-UNAM, Mexico"
],
[
"Loinard",
"Laurent",
"",
"CRyA-UNAM, Mexico"
],
[
"Yee",
"Howard",
"",
"Univ. Toronto,\n Canada"
],
[
"Gladders",
"Mike",
"",
"Univ. Chicago, USA"
]
] |
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] |
801.2614 |
Charles Clark
|
Alan K. Thompson, Michael A. Coplan, John W. Cooper, Patrick Hughes,
Robert E. Vest, Charles W. Clark
|
Observation of the n(3He,t)p Reaction by Detection of Far-Ultraviolet
Radiation
| null |
Journal of Research of the National Institute of Standards and
Technology 113, 69-78 (2008)
| null | null |
nucl-ex physics.atom-ph
| null |
We have detected Lyman alpha radiation as a product of the n(3He,t)p nuclear
reaction occurring in a cell of 3He gas. The predominant source of this
radiation appears to be decay of the 2p state of tritium produced by charge
transfer and excitation collisions with the background 3He gas. Under the
experimental conditions reported here we find yields of tens of Lyman alpha
photons for every neutron reaction. These results suggest a method of cold
neutron detection that is complementary to existing technologies that use
proportional counters. In particular, this approach may provide single neutron
sensitivity with wide dynamic range capability, and a class of neutron
detectors that are compact and operate at relatively low voltages.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 04:33:48 GMT"
}
] | 2008-06-06T00:00:00 |
[
[
"Thompson",
"Alan K.",
""
],
[
"Coplan",
"Michael A.",
""
],
[
"Cooper",
"John W.",
""
],
[
"Hughes",
"Patrick",
""
],
[
"Vest",
"Robert E.",
""
],
[
"Clark",
"Charles W.",
""
]
] |
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] |
801.2615 |
Shimako Yamada
|
Shimako Yamada, Atsuo T. Okazaki and Masayuki Y. Fujimoto
|
Tidal Interactions of Red Giants with Environment Stars in Globular
Clusters
|
36 pages, 11 figures, accepted
| null |
10.1086/533516
| null |
astro-ph
| null |
We investigate the tidal interactions of a red giant with a main sequence in
the dense stellar core of globular clusters by Smoothed Particle Hydrodynamics
method. Two models of $0.8 \msun$ red giant with the surface radii 20 and $85
R_\sun$ are used with 0.6 or $0.8M_\sun$ main sequence star treated as a point
mass. We demonstrate that even for the wide encounters that two stars fly
apart, the angular momentum of orbital motion can be deposited into the red
giant envelope to such an extent as to trigger rotational mixing and to explain
the fast rotation observed for the horizontal branch stars, and also that
sufficient mass can be accreted on the main sequence stars to disguise their
surface convective zone with the matter from the red giant envelope. On the
basis of the present results, we discuss the parameter dependence of these
transfer characteristics with non-linear effects taken into account, and derive
fitting formulae to give the amounts of energy and angular momentum deposited
into the red giant and of mass accreted onto the perturber as functions of
stellar parameters and the impact parameter of encounter. These formulae are
applicable to the encounters not only of the red giants but also of the main
sequence stars, and useful in the study of the evolution of stellar systems
with the star-star interactions taken into account.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 04:36:45 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Yamada",
"Shimako",
""
],
[
"Okazaki",
"Atsuo T.",
""
],
[
"Fujimoto",
"Masayuki Y.",
""
]
] |
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] |
801.2616 |
Arturo Mignano
|
A. Mignano, P. Saracco, M. Longhetti
|
Probing the Nature of EROs through ASTRO-F/AKARI observations
|
4 pages, 3 figures. To appear in the proceedings of `A Century of
Cosmology', S. Servolo, August 2007, to be published in Il Nuovo Cimento
|
Nuovo Cim.B122:1277-1280,2007
|
10.1393/ncb/i2008-10492-y
| null |
astro-ph
| null |
We present a preliminary analysis of ASTRO-F data of a complete sample of
~150 EROs (R-K>5) down to K(Vega)<19, for which reliable photometric redshifts
are available, in the range 0.8<z<2, selected over two fields (S7 and S2) of
the MUNICS survey. The area covered is about 420 arcmin^2. We have imaged this
area with AKARI telescope in N3 (3.4 micron), N60 (65 micron) and WL (150
micron) down to 12 microJy in the N3 filter, in order to detect the rest frame
H or K-band emission, thus providing an excellent sampling of the SED of our
EROs. From a first analysis we have an identification rate of ~63% in the N3
filter over the S7 field. These data allow us to distinguish starburst from
passive early type phenomena, to meseaure the SFR of the starburst component
and to constrain the mass assembly of early type galaxies.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 14:32:03 GMT"
}
] | 2010-11-11T00:00:00 |
[
[
"Mignano",
"A.",
""
],
[
"Saracco",
"P.",
""
],
[
"Longhetti",
"M.",
""
]
] |
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] |
801.2617 |
Saleh Naqib
|
R. S. Islam, J. R. Cooper, J. W. Loram, S. H. Naqib
|
The pseudogap and doping dependent magnetic properties of
La2-xSrxCu1-yZnyO4
|
Submitted to Phys. Rev. B
| null | null | null |
cond-mat.supr-con cond-mat.str-el
| null |
The effects of planar hole content, p (= x), on the static magnetic
susceptibility, chi(T), of polycrystalline La2-xSrxCu1-yZnyO4 compounds were
investigated over a wide range of Sr (x) and Zn (y) contents. The magnetic
behavior caused by Zn was found to depend strongly on the hole content. The
apparent magnetic moment induced by Zn was larger in underdoped
La2-xSrxCu1-yZnyO4, decreased quite sharply around p ~ 0.19, and did not change
much for further overdoping. This is interpreted in terms of the effect of the
pseudogap on the Zn-induced magnetic behavior, as there is growing evidence
that the pseudogap vanishes quite abruptly at p ~ 0.19 +/- 0.01. From a
detailed analysis of chi(T) data the Zn-induced magnetic contribution was found
to be rather complex and showed non-Curie-like features over a wide range of
temperature. The observed behavior was scrutinized in terms of two scenarios
(a) that of independent localized-moments and (b) low energy quasiparticle
resonances associated with each Zn atom. Our study points towards the latter
scenario and more generally suggests that there is a re-distribution of
quasiparticle spectral weight due to Zn substitution, the features of which are
greatly influenced by the presence and magnitude of the pseudogap.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 04:59:12 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Islam",
"R. S.",
""
],
[
"Cooper",
"J. R.",
""
],
[
"Loram",
"J. W.",
""
],
[
"Naqib",
"S. H.",
""
]
] |
[
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] |
801.2618 |
Barry Doyle
|
Barry Doyle (University of California, Irvine) and Cristina Videira
Lopes (University of California, Irvine)
|
Survey of Technologies for Web Application Development
|
43 pages
| null | null | null |
cs.SE cs.IR cs.NI
| null |
Web-based application developers face a dizzying array of platforms,
languages, frameworks and technical artifacts to choose from. We survey,
classify, and compare technologies supporting Web application development. The
classification is based on (1) foundational technologies; (2)integration with
other information sources; and (3) dynamic content generation. We further
survey and classify software engineering techniques and tools that have been
adopted from traditional programming into Web programming. We conclude that,
although the infrastructure problems of the Web have largely been solved, the
cacophony of technologies for Web-based applications reflects the lack of a
solid model tailored for this domain.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 05:06:44 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Doyle",
"Barry",
"",
"University of California, Irvine"
],
[
"Lopes",
"Cristina Videira",
"",
"University of California, Irvine"
]
] |
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-0.0036915413,
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0.057164602,
-0.0399283618,
-0.0190955829,
0.0938085765,
-0.0769794956,
-0.1158492491,
0.0040376233,
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0.0169512313,
-0.0602589808,
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-0.0416655578,
-0.1285524964,
0.1218208596,
-0.0010136471,
-0.0999430493,
0.0155261885,
0.0015989328,
0.0078716688,
-0.0479900353,
0.034879636,
-0.0337396003,
-0.0119228642,
0.0384354591,
0.0211992189,
0.0020137222,
0.0428327359,
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0.0530930497,
-0.0433213226,
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-0.0387340412,
0.0629190654,
0.0363453962,
0.0125946701,
-0.0232485663
] |
801.2619 |
Alex Rozhkov
|
A. V. Rozhkov
|
Density-density propagator for one-dimensional interacting spinless
fermions with non-linear dispersion and calculation of the Coulomb drag
resistivity
|
5 pages, 1 eps figure; the new version of the e-print corrects an
error, which exists in the original submission; fortunately, all important
conclusions of the study remain valid
|
Phys. Rev. B 77, 125109 (2008)
|
10.1103/PhysRevB.77.125109
| null |
cond-mat.str-el cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using bosonization-fermionization transformation we map the
Tomonaga-Luttinger model of spinless fermions with non-linear dispersion on the
model of fermionic quasiparticles whose interaction is irrelevant in the
renormalization group sense. Such mapping allows us to set up an expansion for
the density-density propagator of the original Tomonaga-Luttinger Hamiltonian
in orders of the (irrelevant) quasiparticle interaction. The lowest order term
in such an expansion is proportional to the propagator for free fermions. The
next term is also evaluated. The propagator found is used for calculation of
the Coulomb drug resistivity $r$ in a system of two capacitively coupled
one-dimensional conductors. It is shown that $r$ is proportional to $T^2$ for
both free and interacting fermions. The marginal repulsive in-chain interaction
acts to reduce $r$ as compared to the non-interacting result. The correction to
$r$ due to the quasiparticle interaction is found as well. It scales as $T^4$
at low temperature.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 06:04:52 GMT"
},
{
"version": "v2",
"created": "Tue, 2 Jun 2009 01:14:50 GMT"
}
] | 2009-06-02T00:00:00 |
[
[
"Rozhkov",
"A. V.",
""
]
] |
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-0.1280659735,
-0.0751755014,
0.0981417373,
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-0.090551205,
-0.0476841368,
0.0843230709,
0.0542042144,
0.0517226905,
-0.0028981494,
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0.0335005373,
-0.0470029339,
0.0102180289,
0.0713802353,
0.0812576637,
-0.0229175799,
0.0163001902,
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0.0600917451,
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-0.0762946159,
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-0.069725886,
-0.0712829158,
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0.014560692,
-0.0978497937,
0.0861720443
] |
801.262 |
Leonard Choup Dr
|
Leonard N. Choup
|
Edgeworth Expansion of the Largest Eigenvalue Distribution Function of
GOE
| null | null |
10.1063/1.3046561
| null |
math.PR math-ph math.MP
| null |
In this paper we focus on the large n probability distribution function of
the largest eigenvalue in the Gaussian Orthogonal Ensemble of n by n matrices
(GOEn). We prove an Edgeworth type Theorem for the largest eigenvalue
probability distribution function of GOEn. The correction terms to the limiting
probability distribution are expressed in terms of the same Painleve II
functions appearing in the Tracy-Widom distribution. We conclude with a brief
discussion of the GSEn case.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 06:12:05 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Choup",
"Leonard N.",
""
]
] |
[
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] |
801.2621 |
Uma Divakaran
|
Uma Divakaran and Amit Dutta
|
The effect of the three-spin interaction and the next-nearest neighbor
interaction on the quenching dynamics of a transverse Ising model
|
7 pages, 4 figures
|
J. Stat. Mech. (2007) P11001
| null | null |
cond-mat.stat-mech
| null |
We study the zero temperature quenching dynamics of various extensions of the
transverse Ising model (TIM) when the transverse field is linearly quenched
from $-\infty$ to $+\infty$ (or zero) at a finite and uniform rate. The rate of
quenching is dictated by a characteristic scale given by $\tau$. The density of
kinks produced in these extended models while crossing the quantum critical
points during the quenching process is calculated using a many body
generalization of the Landau-Zener transition theory. The density of kinks in
the final state is found to decay as $\tau^{-1/2}$. In the first model
considered here, the transverse Ising Hamiltonian includes an additional
ferromagnetic three spin interaction term of strength $J_3$. For $J_3<0.5$, the
kink density is found to increase monotonically with $J_3$ whereas it decreases
with $J_3$ for $J_3>0.5$. The point $J_3=0.5$ and the transverse field
$h=-0.5$is multicritical where the density shows a slower decay given by
$\tau^{-1/6}$. We also study the effect of ferromagnetic or antiferromagnetic
next nearest neighbor (NNN) interactions on the dynamics of TIM under the same
quenching scheme. In a mean field approximation, the transverse Ising
Hamiltonians with NNN interactions are identical to the three spin Hamiltonian.
The NNN interactions non-trivially modifies the dynamical behavior, for example
an antiferromagnetic NNN interactions results to a larger number of kinks in
the final state in comparison to the case when the NNN interaction is
ferromagnetic.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 06:30:54 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Divakaran",
"Uma",
""
],
[
"Dutta",
"Amit",
""
]
] |
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-0.0766515136,
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0.1525779516,
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] |
801.2622 |
Farook Rahaman
|
F.Rahaman and P.Ghosh
|
Semiclassical gravitational effects around global monopole in
Brans-Dicke theory
|
9 pages, 5 figures. Submitted to Mod.Phys.Lett.A after minor revision
|
Mod.Phys.Lett.A23:2763-2770,2008
|
10.1142/S0217732308026546
| null |
gr-qc
| null |
In recent past, W.A.Hiscock [ Class.Quan.Grav. (1990) 7,6235 ] studied the
semi classical gravitational effects around global monopole. He obtained the
vacuum expectation value of the stress-energy tensor of an arbitrary collection
of conformal mass less free quantum fields (scalar, spinor and vectors) in the
space time of a global monopole. With this stress-energy tensor, we study the
semi classical gravitational effects of a global monopole in the context of
Brans-Dicke theory of gravity.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 07:01:52 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Rahaman",
"F.",
""
],
[
"Ghosh",
"P.",
""
]
] |
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] |
801.2623 |
Hongyu Liu
|
Hongyu Liu
|
A Global Uniqueness for Formally Determined Inverse Electromagnetic
Obstacle Scattering
| null | null |
10.1088/0266-5611/24/3/035018
| null |
math.AP
| null |
It is proved that a general polyhedral perfect conducting obstacle in
$\mathbb{R}^3$, possibly consisting of finitely many solid polyhedra, is
uniquely determined by the far-field pattern corresponding to a single incident
wave. This improves earlier results in the literature to the formally
determined case.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 07:08:47 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Liu",
"Hongyu",
""
]
] |
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-0.0293689054,
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] |
801.2624 |
Claire Lacour
|
Claire Lacour
|
Least squares type estimation of the transition density of a particular
hidden Markov chain
|
Published in at http://dx.doi.org/10.1214/07-EJS111 the Electronic
Journal of Statistics (http://www.i-journals.org/ejs/) by the Institute of
Mathematical Statistics (http://www.imstat.org)
|
Electronic Journal of Statistics 2008, Vol. 2, 1-39
|
10.1214/07-EJS111
|
IMS-EJS-EJS_2007_111
|
math.ST stat.TH
| null |
In this paper, we study the following model of hidden Markov chain:
$Y_i=X_i+\epsilon_i$, $i=1,...,n+1$ with $(X_i)$ a real-valued stationary
Markov chain and $(\epsilon_i)_{1\leq i\leq n+1}$ a noise having a known
distribution and independent of the sequence $(X_i)$. We present an estimator
of the transition density obtained by minimization of an original contrast that
takes advantage of the regressive aspect of the problem. It is selected among a
collection of projection estimators with a model selection method. The
$L^2$-risk and its rate of convergence are evaluated for ordinary smooth noise
and some simulations illustrate the method. We obtain uniform risk bounds over
classes of Besov balls. In addition our estimation procedure requires no prior
knowledge of the regularity of the true transition. Finally, our estimator
permits to avoid the drawbacks of quotient estimators.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 07:15:25 GMT"
}
] | 2009-09-29T00:00:00 |
[
[
"Lacour",
"Claire",
""
]
] |
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] |
801.2625 |
Eyal Lubetzky
|
Jian Ding, Eyal Lubetzky and Yuval Peres
|
Total-variation cutoff in birth-and-death chains
|
25 pages
| null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The cutoff phenomenon describes a case where a Markov chain exhibits a sharp
transition in its convergence to stationarity. In 1996, Diaconis surveyed this
phenomenon, and asked how one could recognize its occurrence in families of
finite ergodic Markov chains. In 2004, the third author noted that a necessary
condition for cutoff in a family of reversible chains is that the product of
the mixing-time and spectral-gap tends to infinity, and conjectured that in
many settings, this condition should also be sufficient. Diaconis and
Saloff-Coste (2006) verified this conjecture for continuous-time
birth-and-death chains, started at an endpoint, with convergence measured in
separation. It is natural to ask whether the conjecture holds for these chains
in the more widely used total-variation distance.
In this work, we confirm the above conjecture for all continuous-time or lazy
discrete-time birth-and-death chains, with convergence measured via
total-variation distance. Namely, if the product of the mixing-time and
spectral-gap tends to infinity, the chains exhibit cutoff at the maximal
hitting time of the stationary distribution median, with a window of at most
the geometric mean between the relaxation-time and mixing-time.
In addition, we show that for any lazy (or continuous-time) birth-and-death
chain with stationary distribution $\pi$, the separation $1 - p^t(x,y)/\pi(y)$
is maximized when $x,y$ are the endpoints. Together with the above results,
this implies that total-variation cutoff is equivalent to separation cutoff in
any family of such chains.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 08:48:23 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 23:27:12 GMT"
},
{
"version": "v3",
"created": "Thu, 13 Mar 2008 06:07:43 GMT"
},
{
"version": "v4",
"created": "Mon, 6 Oct 2008 16:42:33 GMT"
}
] | 2008-10-06T00:00:00 |
[
[
"Ding",
"Jian",
""
],
[
"Lubetzky",
"Eyal",
""
],
[
"Peres",
"Yuval",
""
]
] |
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-0.1019491032,
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-0.1164171249,
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-0.0302538723,
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0.0533578508,
-0.0436003432,
0.0137249958,
-0.0166830905,
-0.074583225,
0.014201656,
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0.0530774631,
-0.0291042812,
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0.0294127092,
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-0.0100939702,
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-0.0945468545,
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] |
801.2626 |
Stephane Cordier
|
Jos\'e Antonio Carrillo, St\'ephane Cordier (MAPMO), Giuseppe Toscani
|
Over-populated Tails for conservative-in-the-mean Inelastic Maxwell
Models
| null | null | null | null |
math.AP
| null |
We introduce and discuss spatially homogeneous Maxwell-type models of the
nonlinear Boltzmann equation undergoing binary collisions with a random
component. The random contribution to collisions is such that the usual
collisional invariants of mass, momentum and energy do not hold pointwise, even
if they all hold in the mean. Under this assumption it is shown that, while the
Boltzmann equation has the usual conserved quantities, it possesses a steady
state with power-like tails for certain random variables. A similar situation
occurs in kinetic models of economy recently considered by two of the authors
[24], which are conservative in the mean but possess a steady distribution with
Pareto tails. The convolution-like gain operator is subsequently shown to have
good contraction/expansion properties with respect to different metrics in the
set of probability measures. Existence and regularity of isotropic stationary
states is shown directly by constructing converging iteration sequences as done
in [8]. Uniqueness, asymptotic stability and estimates of overpopulated high
energy tails of the steady profile are derived from the basic property of
contraction/expansion of metrics. For general initial conditions the solutions
of the Boltzmann equation are then proved to converge with computable rate as t
goes to infinity to the steady solution in these distances, which metricizes
the weak convergence of measures. These results show that power-like tails in
Maxwell models are obtained when the point-wise conservation of momentum and/or
energy holds only globally.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 07:31:03 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Carrillo",
"José Antonio",
"",
"MAPMO"
],
[
"Cordier",
"Stéphane",
"",
"MAPMO"
],
[
"Toscani",
"Giuseppe",
""
]
] |
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-0.1156527549,
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-0.0635891408,
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-0.0051728277,
-0.0522623248,
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] |
801.2627 |
Benjamin Ricaud
|
Horia D. Cornean (MATH. Dept., Aalborg University), Pierre Duclos
(CPT), Benjamin Ricaud (CPT)
|
On the skeleton method and an application to a quantum scissor
|
Submitted
| null | null | null |
math-ph math.MP
| null |
In the spectral analysis of few one dimensional quantum particles interacting
through delta potentials it is well known that one can recast the problem into
the spectral analysis of an integral operator (the skeleton) living on the
submanifold which supports the delta interactions. We shall present several
tools which allow direct insight into the spectral structure of this skeleton.
We shall illustrate the method on a model of a two dimensional quantum particle
interacting with two infinitely long straight wires which cross one another at
a certain angle : the quantum scissor.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 07:31:49 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Cornean",
"Horia D.",
"",
"MATH. Dept., Aalborg University"
],
[
"Duclos",
"Pierre",
"",
"CPT"
],
[
"Ricaud",
"Benjamin",
"",
"CPT"
]
] |
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] |
801.2628 |
A. de Visser
|
N.T. Huy, D.E. de Nijs, Y.K. Huang, A. de Visser
|
Unusual upper critical field of the ferromagnetic superconductor UCoGe
|
4 pages, accepted for publication in PRL
|
Phys. Rev. Lett. 100 (2008) 077001-1:4.
|
10.1103/PhysRevLett.100.077002
| null |
cond-mat.supr-con
| null |
We report upper critical field $B_{c2}(T)$ measurements on a
single-crystalline sample of the ferromagnetic superconductor UCoGe.
$B_{c2}(0)$ obtained for fields applied along the orthorhombic axes exceeds the
Pauli limit for $B \parallel a,b$ and shows a strong anisotropy $B_{c2}^{a}
\simeq B_{c2}^{b} \gg B_{c2} ^{c}$. This provide evidence for an equal spin
pairing state and a superconducting gap function of axial symmetry with point
nodes along the c axis, which is also the direction of the uniaxial
ferromagnetic moment $m_0 = 0.07 \mu_{B}$. An unusual curvature or kink is
observed in the temperature variation of $B_{c2}$, which possibly indicates
UCoGe is a two-band ferromagnetic superconductor.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 07:48:58 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Huy",
"N. T.",
""
],
[
"de Nijs",
"D. E.",
""
],
[
"Huang",
"Y. K.",
""
],
[
"de Visser",
"A.",
""
]
] |
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] |
801.2629 |
Veer Awana Dr
|
Monika Mudgel, V. P. S. Awana, R. Lal, and H. Kishan (NPL, New Delhi
India), L. S. Sharth Chandra, V. Ganesan and A. V. Narlikar (IUC-Indore,
India), and G. L. Bhalla (Univ. Delhi, India)
|
Anomalous thermoelectric power of Mg1-xAlxB2 system with x = 0.0 to 1.0
|
19 pages Text + Figs.
suggestions/comments(awana@mail.nplindia.ernet.in)
|
Phys. Cond. Matt. 20, 095205 (2008)
|
10.1088/0953-8984/20/9/095205
| null |
cond-mat.str-el cond-mat.supr-con
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Thermoelectric power, S(T) of the Mg1-xAlxB2 system has been measured for x =
0.0, 0.1, 0.2, 0.4, 0.6, 0.8 and 1.0. XRD, resistivity and magnetization
measurements are also presented. It has been found that the thermoelectric
power is positive for x = 0.4 and is negative for x = 0.6 over the entire
temperature range studied up to 300 K. The thermoelectric power of x = 0.4
samples vanishes discontinuously below a certain temperature, implying
existence of superconductivity. In general, the magnitude of the thermoelectric
power increases with temperature up to a certain temperature, and then it
starts to decrease towards zero base line. In order to explain the observed
behavior of the thermoelectric power, we have used a model in which both
diffusion and phonon drag processes are combined by using a phenomenological
interpolation between the low and high temperature behaviors of the
thermoelectric power. The considered model provides an excellent fit to the
observed data. It is further found that Al doping enhances the Debye
temperature.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 08:00:43 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jan 2012 09:15:39 GMT"
}
] | 2012-01-24T00:00:00 |
[
[
"Mudgel",
"Monika",
"",
"NPL, New Delhi\n India"
],
[
"Awana",
"V. P. S.",
"",
"NPL, New Delhi\n India"
],
[
"Lal",
"R.",
"",
"NPL, New Delhi\n India"
],
[
"Kishan",
"H.",
"",
"NPL, New Delhi\n India"
],
[
"Chandra",
"L. S. Sharth",
"",
"IUC-Indore,\n India"
],
[
"Ganesan",
"V.",
"",
"IUC-Indore,\n India"
],
[
"Narlikar",
"A. V.",
"",
"IUC-Indore,\n India"
],
[
"Bhalla",
"G. L.",
"",
"Univ. Delhi, India"
]
] |
[
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-0.0218174737,
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-0.0369020291,
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] |
801.263 |
Michel Rausch de Traubenberg
|
R. Campoamor-Stursberg and M. Rausch de Traubenberg
|
Kinematical superalgebras and Lie algebras of order 3
|
LaTeX, 16 pages
|
J.Math.Phys.49:063506,2008
|
10.1063/1.2942414
| null |
hep-th math-ph math.MP
| null |
We study and classify kinematical algebras which appear in the framework of
Lie superalgebras or Lie algebras of order three. All these algebras are
related through generalised Inon\"u-Wigner contractions from either the
orthosymplectic superalgebra or the de Sitter Lie algebra of order three.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 08:23:58 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Campoamor-Stursberg",
"R.",
""
],
[
"de Traubenberg",
"M. Rausch",
""
]
] |
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-0.0352568626,
0.0394092239,
-0.1004209146,
-0.0102917431,
-0.0528343432,
0.0513568148,
-0.0848304555,
0.0217171069,
0.0245447885,
-0.0269776136,
-0.0239079222,
0.0296014976,
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-0.0122723943,
0.0672529712,
-0.0548723117,
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-0.038517613,
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0.0879383609,
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0.0273852069,
-0.092574738,
0.1298186183
] |
801.2631 |
Paolo Ventura
|
Paolo Ventura Francesca D'Antona
|
Self-enrichment by AGB stars in Globular Clusters: comparison between
intermediate and high metallicities
|
8 pages, 5 figures
| null | null | null |
astro-ph
| null |
We present theoretical evolutionary sequences of intermediate mass stars
(M=3-6.5 solar masses) with metallicity Z=0.004. Our goal is to test whether
the self-enrichment scenario by massive Asymptotic Giant Branch stars may work
for the high metallicity Globular Clusters, after previous works by the same
group showed that the theoretical yields by this class of objects can reproduce
the observed trends among the abundances of some elements, namely the O-Al and
O-Na anticorrelations, at intermediate metallicities, i.e [Fe/H]=-1.3. We find
that the increase in the metallicity favours only a modest decrease of the
luminosity and the temperature at the bottom of the envelope for the same core
mass, and also the efficiency of the third dredge-up is scarcely altered. On
the contrary, differences are found in the yields, due to the different impact
that processes with the same efficiency have on the overall abundance of
envelopes with different metallicities. We expect the same qualitative patterns
as in the intermediate metallicity case, but the slopes of some of the
relationships among the abundances of some elements are different. We compare
the sodium-oxygen anticorrelation for clusters of intermediate metallicity
(Z~0.001) and clusters of metallicity large as in these new models. Although
the observational data are still too scarce, the models are consistent with the
observed trends, provided that only stars of M>5 solar masses contribute to
self-enrichment.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 08:37:28 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"D'Antona",
"Paolo Ventura Francesca",
""
]
] |
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-0.0249015968,
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-0.087155588,
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] |
801.2632 |
Dorin Popescu
|
Dorin Popescu
|
Stanley Depth of Multigraded Modules
| null | null | null | null |
math.AC math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Stanley's Conjecture on Cohen-Macaulay multigraded modules is studied
especially in dimension 2. In codimension 2 similar results were obtained by
Herzog, Soleyman-Jahan and Yassemi. As a consequence of our results Stanley's
Conjecture holds in 5 variables.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 08:37:29 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 14:39:48 GMT"
},
{
"version": "v3",
"created": "Wed, 7 May 2008 08:56:15 GMT"
},
{
"version": "v4",
"created": "Thu, 6 Nov 2008 04:04:25 GMT"
}
] | 2008-11-06T00:00:00 |
[
[
"Popescu",
"Dorin",
""
]
] |
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] |
801.2633 |
Luis Roca
|
E. Oset, J. R. Pelaez and L. Roca
|
$\eta \to \pi^0 \gamma \gamma$ decay within a chiral unitary approach
revisited
| null |
Phys.Rev.D77:073001,2008
|
10.1103/PhysRevD.77.073001
| null |
hep-ph
| null |
In view of the recent experimental developments on the experimental side in
the $\eta \to \pi^0 \gamma \gamma$ decay, and the fact that the Particle Data
Group in the on line edition of 2007 reports sizable changes of the radiative
decay widths of vector mesons used as input in the theoretical calculations of
\cite{eta}, a reevaluation of the decay width of the $\eta$ in this channel has
been done, reducing its uncertainty by almost a factor of two. The new input of
the PDG is used and invariant mass distributions and total widths are compared
with the most recent results from AGS, MAMI and preliminary ones of KLOE. The
agreement of the theory with the AGS and MAMI data is very good, both for the
total rates as well as for the invariant mass distributions of the two photons.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 08:37:55 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Oset",
"E.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Roca",
"L.",
""
]
] |
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] |
801.2634 |
Karsten Held
|
K. Held, O. K. Andersen, M. Feldbacher, A. Yamasaki, and Y.-F. Yang
|
Bandstructure meets many-body theory: The LDA+DMFT method
|
Introduction of LDA+DMFT in a nutshell, as presented at the workshop
''Theory meets Industry'' Vienna, 2007. The manuscript will be published as
is in the workshop's proceedings, a special issue of J. Phys. Cond. Matter.
11 pages, 4 figures (in 8 eps files)
|
Journal of Physics 20, 064202 (2008)
|
10.1088/0953-8984/20/6/064202
| null |
cond-mat.str-el cond-mat.mtrl-sci
| null |
Ab initio calculation of the electronic properties of materials is a major
challenge for solid state theory. Whereas the experience of forty years has
proven density functional theory (DFT) in a suitable, e.g. local approximation
(LDA) to give a satisfactory description in case electronic correlations are
weak, materials with strongly correlated, say d- or f-electrons remain a
challenge. Such materials often exhibit colossal responses to small changes of
external parameters such as pressure, temperature, and magnetic field, and are
therefore most interesting for technical applications.
Encouraged by the success of dynamical mean field theory (DMFT) in dealing
with model Hamiltonians for strongly correlated electron systems, physicists
from the bandstructure and many-body communities have joined forces and have
developed a combined LDA+DMFT method for treating materials with strongly
correlated electrons ab initio. As a function of increasing Coulomb
correlations, this new approach yields a weakly correlated metal, a strongly
correlated metal, or a Mott insulator.
In this paper, we introduce the LDA+DMFT by means of an example, LaMnO_3 .
Results for this material, including the colossal magnetoresistance of doped
manganites are presented. We also discuss advantages and disadvantages of the
LDA+DMFT approach.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 08:47:05 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Held",
"K.",
""
],
[
"Andersen",
"O. K.",
""
],
[
"Feldbacher",
"M.",
""
],
[
"Yamasaki",
"A.",
""
],
[
"Yang",
"Y. -F.",
""
]
] |
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] |
801.2635 |
Naoyuki Haba
|
Naoyuki Haba, Yutaka Sakamura, and Toshifumi Yamashita
|
iGUT: Grand Unified Theory on Interval
|
36 pages
|
JHEP 0806:044,2008
|
10.1088/1126-6708/2008/06/044
|
OU-HET 594/2007
|
hep-ph
| null |
We investigate a construction of five-dimensional (5D) grand unified theories
(GUTs) on an interval, which we call iGUTs. We analyze supersymmetric SO(10)
iGUT as an example, where the gauge multiplet is spread over the 5D bulk. The
SO(10) is directly reduced to the standard model gauge symmetry through the
interval boundary conditions. Notice that this rank reduction is impossible in
case of GUTs on orbifolds. Four scenarios are possible according to locations
(bulk or brane) of Higgs and matter fields. We investigate the gauge-coupling
unification, the proton decay, the SO(10) GUT features such as t-b-tau
unification and so on in each scenario. We also comment on the flavor
phenomenology.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:11:02 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Apr 2008 12:53:11 GMT"
}
] | 2014-11-18T00:00:00 |
[
[
"Haba",
"Naoyuki",
""
],
[
"Sakamura",
"Yutaka",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] |
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] |
801.2636 |
Jamil Abed
|
Jamil Abed and Bert-Wolfgang Schulze
|
Operators with Corener-degenerate Symbols
|
40 pages
| null | null | null |
math.AP
| null |
We establish elements of a new approch to ellipticity and parametrices within
operator algebras on a manifold with higher singularities, only based on some
general axiomatic requirements on parameter-dependent operators in suitable
scales of spaces. The idea is to model an iterative process with new
generations of parameter-dependent operator theories, together with new scales
of spaces that satisfy analogous requirements as the original ones, now on a
corresponding higher level.
The "full" calculus is voluminous; so we content ourselves here with some
typical aspects such as symbols in terms of order reducing families, classes of
relevant examples, and operators near a corner point.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 09:23:23 GMT"
},
{
"version": "v2",
"created": "Sat, 9 Feb 2008 11:18:23 GMT"
}
] | 2008-02-11T00:00:00 |
[
[
"Abed",
"Jamil",
""
],
[
"Schulze",
"Bert-Wolfgang",
""
]
] |
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0.0522461236,
-0.0564414784,
-0.0211725459,
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0.0068419208,
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-0.0492814109,
0.0355486199,
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0.0712091178,
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-0.0169352405,
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-0.0457573123,
-0.0610843338,
0.0403313227,
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0.0299268495,
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-0.0520503409,
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] |
801.2637 |
Jonathan Keeling
|
Jonathan Keeling
|
Polarized polariton condensates and coupled XY models
|
6 pages, 3 figures. Extended version
|
Phys. Rev. B 78 205316 (2008)
|
10.1103/PhysRevB.78.205316
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Microcavity polaritons, which at low temperatures can condense to a
macroscopic coherent state, possess a polarization degree of freedom. This
article discusses the phase diagram of such a system, showing the boundaries
between differently polarized condensates. The Bogoliubov approximation is
shown to have problems in describing the transition between differently
polarized phases; the Hartree-Fock-Popov approximation performs better, and
compares well to exact results that can be used in the limit where the left-
and right-circular polarization states decouple. The effect on the phase
boundary of various symmetry breaking terms present in real microcavities are
also considered.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 09:26:20 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Oct 2008 19:28:19 GMT"
}
] | 2008-11-17T00:00:00 |
[
[
"Keeling",
"Jonathan",
""
]
] |
[
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] |
801.2638 |
Pierre Jammes
|
Pierre Jammes
|
Premi\`ere valeur propre du laplacien, volume conforme et chirurgies
|
11 pages, 5 figures, in French
|
Geom. Dedicata 135 (2008), 29-37
|
10.1007/s10711-008-9260-2
| null |
math.DG math.SP
| null |
We define a new differential invariant a compact manifold by $V_{\mathcal
M}(M)=\inf_g V_c(M,[g])$, where $V_c(M,[g])$ is the conformal volume of $M$ for
the conformal class $[g]$, and prove that it is uniformly bounded above. The
main motivation is that this bound provides a upper bound of the
Friedlander-Nadirashvili invariant defined by $\inf_g\sup_{\tilde
g\in[g]}\lambda_1(M,\tilde g)\Vol(M,\tilde g)^{\frac 2n}$.
The proof relies on the study of the behaviour of $V_{\mathcal M}(M)$ when
one performs surgeries on $M$.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 09:34:35 GMT"
}
] | 2014-09-10T00:00:00 |
[
[
"Jammes",
"Pierre",
""
]
] |
[
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] |
801.2639 |
Manfred Requardt
|
Manfred Requardt
|
Thermodynamics meets Special Relativity -- or what is real in Physics?
|
27 pages, latex, no figures
| null | null | null |
gr-qc cond-mat.stat-mech hep-th
| null |
In this paper we carefully reexamine the various framworks existing in the
field of relativistic thermodynamics. We scrutinize in particular the different
conceptual foundations of notions like the relativistic work, heat force,
moving heat and relativistic temperature. As to the latter notion we argue
that, as in ordinary thermodynamics, relativistic absolute temperature should
be introduced operationally via relativistic Carnot processes. We exhibit the
more implicit or even hidden tacit preassumptions being made and point to a
couple of gaps, errors and inconclusive statements in some of the existing
literature. We show in particular that there is a wide-spread habit to draw
general conclusions from the analysis of too restricted and special
thermodynamic processes, e.g. processes with constant pressure, which is
dangerous and sometimes leads to wrong results. Furthermore, we give a detailed
analysis of the so-called zeroth law of relativistic thermodynamics with the
help of a relativistic Carnot process. We rigorously show that, contrary to
certain statements in the literature, thermodynamic systems at different
relativistic temperatures, moving relative to each other, can thermally stably
coexist provided that their respective temperatures obey a certain functional
relation (given by the Lorentz factor). This implies however that their
respective rest temperatures are the same.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 09:43:50 GMT"
}
] | 2008-01-21T00:00:00 |
[
[
"Requardt",
"Manfred",
""
]
] |
[
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] |
801.264 |
Maria Colom\'e-Tatch\'e
|
M. Colom\'e-Tatch\'e
|
Two-component repulsive Fermi gases with population imbalance in
elongated harmonic traps
|
6 pages, 3 figures. Published version
|
Phys. Rev. A 78, 033612 (2008)
|
10.1103/PhysRevA.78.033612
| null |
cond-mat.str-el
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the two-component repulsive Fermi gas with imbalanced populations in
one dimension. Starting from the Bethe Ansatz solution we calculate
analytically the phase diagram for the homogeneous system. We show that three
phases appear: the balanced phase, the fully polarised phase and the partially
polarised phase. By means of the local density approximation and the equation
of state for the homogeneous system we calculate the density profile for the
harmonically confined case. We show that a two-shell structure appears: at the
center of the cloud we find the partially polarised phase and at the edges the
fully polarised one. The radii of the inner and outer shells are calculated for
different values of the polarisation and the coupling strength. We calculate
the dependence of the magnetisation on the polarisation for different values of
the coupling strength and we show that the susceptibility is always finite.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 10:29:16 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Dec 2009 10:39:50 GMT"
}
] | 2009-12-08T00:00:00 |
[
[
"Colomé-Tatché",
"M.",
""
]
] |
[
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] |
801.2641 |
Kiyoshi Shiraishi
|
Teruki Hanada, Kazuhiko Shinoda and Kiyoshi Shiraishi (Yamaguchi
University)
|
Multi-graviton theory in vierbein formalism
|
4 pages, no figure. A presentation given at JGRG17 (Nagoya, Japan),
to appear in the proceedings
| null | null | null |
gr-qc hep-th
| null |
Recently, multi-graviton theory on a simple closed circuit graph
corresponding to the $S^1$ compactification of the Kaluza-Klein (KK) theory has
been considered. In the present paper, we extend this theory to that on a
general graph and study what modes of particles are included. Furthermore, we
generalize it in a possible non-linear theory based on the vierbein formalism
and study cosmological solutions.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 10:30:22 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Hanada",
"Teruki",
"",
"Yamaguchi\n University"
],
[
"Shinoda",
"Kazuhiko",
"",
"Yamaguchi\n University"
],
[
"Shiraishi",
"Kiyoshi",
"",
"Yamaguchi\n University"
]
] |
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] |
801.2642 |
Francesco Perfetto
|
The KLOE collaboration: F. Ambrosino, A. Antonelli, M. Antonelli, F.
Archilli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C.
Bloise, S. Bocchetta, F. Bossi, P. Branchini, R. Caloi, P. Campana, G. Capon,
T. Capussela, F. Ceradini, F. Cesario, S. Chi, G. Chiefari, P. Ciambrone, F.
Crucianelli, E. De Lucia, A. De Santis, P. De Simone, G. De Zorzi, A. Denig,
A. Di Domenico, C. Di Donato, B. Di Micco, A. Doria, M. Dreucci, G. Felici,
A. Ferrari, M. L. Ferrer, S. Fiore, C. Forti, P. Franzini, C. Gatti, P.
Gauzzi, S. Giovannella, E. Gorini, E. Graziani, W. Kluge, V. Kulikov, F.
Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, M. Martini, P. Massarotti,
W. Mei, S. Meola, S. Miscetti, M. Moulson, S. M\"uller, F. Murtas, M.
Napolitano, F. Nguyen, M. Palutan, E. Pasqualucci, A. Passeri, V. Patera, F.
Perfetto, M. Primavera, P. Santangelo, G. Saracino, B. Sciascia, A. Sciubba,
A. Sibidanov, T. Spadaro, M. Testa, L. Tortora, P. Valente, G. Venanzoni, R.
Versaci, G. Xu
|
Determination of $\eta\to\pi^+\pi^-\pi^0$ Dalitz plot slopes and
asymmetries with the KLOE detector
|
15 pages, 7 figures
|
JHEP 0805:006,2008
|
10.1088/1126-6708/2008/05/006
| null |
hep-ex
| null |
We have studied, with the KLOE detector at the DA$\Phi$NE $\Phi$-Factory, the
dynamics of the decay $\eta\to\pi^+\pi^-\pi^0$ using $\eta$ mesons from the
decay $\phi\to\eta\gamma$ for an integrated luminosity ${\mathcal L}$ = 450
pb$^{-1}$. From a fit to the Dalitz plot density distribution we obtain a
precise measurement of the slope parameters. An alternative parametrization
relates the $\pi^+\pi^-\pi^0$ slopes to that for $\eta\to 3\pi^0$ showing the
consistency of KLOE results for both channels. We also obtain the best
confirmation of the $C$-invariance in the $\eta\to\pi^+\pi^-\pi^0$ decay.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 10:38:17 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Mar 2008 13:18:36 GMT"
}
] | 2009-01-06T00:00:00 |
[
[
"The KLOE collaboration",
"",
""
],
[
"Ambrosino",
"F.",
""
],
[
"Antonelli",
"A.",
""
],
[
"Antonelli",
"M.",
""
],
[
"Archilli",
"F.",
""
],
[
"Bacci",
"C.",
""
],
[
"Beltrame",
"P.",
""
],
[
"Bencivenni",
"G.",
""
],
[
"Bertolucci",
"S.",
""
],
[
"Bini",
"C.",
""
],
[
"Bloise",
"C.",
""
],
[
"Bocchetta",
"S.",
""
],
[
"Bossi",
"F.",
""
],
[
"Branchini",
"P.",
""
],
[
"Caloi",
"R.",
""
],
[
"Campana",
"P.",
""
],
[
"Capon",
"G.",
""
],
[
"Capussela",
"T.",
""
],
[
"Ceradini",
"F.",
""
],
[
"Cesario",
"F.",
""
],
[
"Chi",
"S.",
""
],
[
"Chiefari",
"G.",
""
],
[
"Ciambrone",
"P.",
""
],
[
"Crucianelli",
"F.",
""
],
[
"De Lucia",
"E.",
""
],
[
"De Santis",
"A.",
""
],
[
"De Simone",
"P.",
""
],
[
"De Zorzi",
"G.",
""
],
[
"Denig",
"A.",
""
],
[
"Di Domenico",
"A.",
""
],
[
"Di Donato",
"C.",
""
],
[
"Di Micco",
"B.",
""
],
[
"Doria",
"A.",
""
],
[
"Dreucci",
"M.",
""
],
[
"Felici",
"G.",
""
],
[
"Ferrari",
"A.",
""
],
[
"Ferrer",
"M. L.",
""
],
[
"Fiore",
"S.",
""
],
[
"Forti",
"C.",
""
],
[
"Franzini",
"P.",
""
],
[
"Gatti",
"C.",
""
],
[
"Gauzzi",
"P.",
""
],
[
"Giovannella",
"S.",
""
],
[
"Gorini",
"E.",
""
],
[
"Graziani",
"E.",
""
],
[
"Kluge",
"W.",
""
],
[
"Kulikov",
"V.",
""
],
[
"Lacava",
"F.",
""
],
[
"Lanfranchi",
"G.",
""
],
[
"Lee-Franzini",
"J.",
""
],
[
"Leone",
"D.",
""
],
[
"Martini",
"M.",
""
],
[
"Massarotti",
"P.",
""
],
[
"Mei",
"W.",
""
],
[
"Meola",
"S.",
""
],
[
"Miscetti",
"S.",
""
],
[
"Moulson",
"M.",
""
],
[
"Müller",
"S.",
""
],
[
"Murtas",
"F.",
""
],
[
"Napolitano",
"M.",
""
],
[
"Nguyen",
"F.",
""
],
[
"Palutan",
"M.",
""
],
[
"Pasqualucci",
"E.",
""
],
[
"Passeri",
"A.",
""
],
[
"Patera",
"V.",
""
],
[
"Perfetto",
"F.",
""
],
[
"Primavera",
"M.",
""
],
[
"Santangelo",
"P.",
""
],
[
"Saracino",
"G.",
""
],
[
"Sciascia",
"B.",
""
],
[
"Sciubba",
"A.",
""
],
[
"Sibidanov",
"A.",
""
],
[
"Spadaro",
"T.",
""
],
[
"Testa",
"M.",
""
],
[
"Tortora",
"L.",
""
],
[
"Valente",
"P.",
""
],
[
"Venanzoni",
"G.",
""
],
[
"Versaci",
"R.",
""
],
[
"Xu",
"G.",
""
]
] |
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] |
801.2643 |
Daniele Montanino dr.
|
D. Montanino, M. Picariello (Salento U.), J. Pulido (Lisbon, IST)
|
Probing neutrino magnetic moment and unparticle interactions with
Borexino
|
16 pages, 3 figures. Some clarifications and references added.
Accepted for publication in Phys. Rev. D
|
Phys.Rev.D77:093011,2008
|
10.1103/PhysRevD.77.093011
| null |
hep-ph hep-ex
| null |
We discuss the limits on the neutrino magnetic moment and hypothetical
interactions with a hidden unparticle sector, coming from the first neutrino
data release of the Borexino experiment. The observed spectrum in Borexino
depends weakly on the solar model used in the analysis, since most of the
signal comes from the mono-energetic 7Be neutrinos. This fact allows us to
calibrate the nu-e scattering cross section through the spectral shape. In this
way, we have derived a limit on the magnetic moment for the neutrinos coming
from the Sun (in which a nu_mu and nu_tau component is present): mu_nu<8.4E-11
mu_B (90%CL) which is comparable with those obtained from low energy reactor
experiments. Moreover, we improve the previous upper limit on magnetic moment
of the nu_tau by three orders of magnitude and the limit on the coupling
constant of the neutrino with a hidden unparticle sector.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 18:48:37 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 18:37:49 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Apr 2008 10:31:51 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Montanino",
"D.",
"",
"Salento U."
],
[
"Picariello",
"M.",
"",
"Salento U."
],
[
"Pulido",
"J.",
"",
"Lisbon, IST"
]
] |
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] |
801.2644 |
Friedrich Wehrung
|
Joao Araujo (CAUL), Friedrich Wehrung (LMNO)
|
Embedding properties of endomorphism semigroups
|
To appear in Fundamenta Mathematicae
| null | null | null |
math.RA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Denote by PSelf(X) (resp., Self(X)) the partial (resp., full) transformation
monoid over a set X, and by Sub(V) (resp., End(V)) the collection of all
subspaces (resp., endomorphisms) of a vector space V. We prove various results
that imply the following: (1) If X has at least two elements, then Self(X) has
a semigroup embedding into the dual of Self(Y) iff card(Y) >= 2^card(X). In
particular, if X has at least two elements, then there exists no semigroup
embedding from Self(X) into the dual of PSelf(X). (2) If V is
infinite-dimensional, then there are no embedding from (Sub(V),+) into
(Sub(V),\cap) and no semigroup embedding from End(V) into its dual. (3) Let F
be an algebra freely generated by an infinite subset X. If F has less than
2^card(X) operations, then End(F) has no semigroup embedding into its dual. The
cardinality bound 2^card(X) is optimal. (4) Let F be a free left module over a
left aleph one - noetherian ring (i.e., a ring without strictly increasing
chains, of length aleph one, of left ideals). Then End(F) has no semigroup
embedding into its dual. (1) and (2) above solve questions proposed by B. M.
Schein and G. M. Bergman. We also formalize our results in the settings of
algebras endowed with a notion of independence (in particular independence
algebras).
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 10:54:28 GMT"
},
{
"version": "v2",
"created": "Wed, 15 Oct 2008 09:26:53 GMT"
}
] | 2008-10-15T00:00:00 |
[
[
"Araujo",
"Joao",
"",
"CAUL"
],
[
"Wehrung",
"Friedrich",
"",
"LMNO"
]
] |
[
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] |
801.2645 |
Denise Hagnier
|
Fr\'ed\'erique Battin-Leclerc (DCPR), A.A. Konnov, J.L. Jaffrezo
(LGGE), M. Legrand (LGGE)
|
To better understand the formation of short-chain acids in combustion
systems
| null |
Combustion Science and Technology 180 (2008) 343-370
|
10.1080/00102200701740782
| null |
physics.chem-ph
| null |
Our study aims at a better control and understanding of the transfer of a
complex [DNA supercoiled plasmid - dodecyltrimethylammonium surfactant] layer
from a liquid-vapour water interface onto a silicon surface without any
additional cross-linker. The production of the complexed layer and its transfer
from the aqueous subphase to the substrate is achieved with a Langmuir-Blodgett
device. The substrate consists of a reconstructed boron doped silicon substrate
with a nanometer-scale roughness. Using X-ray photoelectron spectroscopy and
atomic force microscopy measurements, it is shown that the DNA complexes are
stretched in a disorderly manner throughout a 2-4 nm high net-like structure.
The mechanism of transfer of this layer onto the planar surface of the
semi-conductor and the parameters of the process are analysed and illustrated
by atomic force microscopy snapshots. The molecular layer exhibits the typical
characteristics of a spinodal decomposition pattern or dewetting features.
Plasmid molecules appear like long flattened fibers covering the surface,
forming holes of various shapes and areas. The cluster-cluster aggregation of
the complex structure gets very much denser on the substrate edge. The
supercoiled DNA plasmids undergo conformational changes and a high degree of
condensation and aggregation is observed.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 10:55:44 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Battin-Leclerc",
"Frédérique",
"",
"DCPR"
],
[
"Konnov",
"A. A.",
"",
"LGGE"
],
[
"Jaffrezo",
"J. L.",
"",
"LGGE"
],
[
"Legrand",
"M.",
"",
"LGGE"
]
] |
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] |
801.2646 |
Frank Close Prof
|
Frank Close
|
Three flavours of Hybrid or $\pi$ exhange: which is more attractive?
|
Plenary talk at XII Conference on Hadron Spectroscopy, Frascati 2007
| null | null | null |
hep-ph hep-ex
| null |
This review summarises issues that have arisen since the appearance of
"Rumsfeld Hadrons". We show that signals $\phi(2175)$; Y(4260) and
$\Upsilon(10890)$ in the \ssbar, \cc and \bb share features that point to the
possible role of $\pi$ exchange forces between flavoured mesons generating
effects that can mimic hybrid mesons. The flavour dependence of these phenomena
may help to resolve this question.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:00:42 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Close",
"Frank",
""
]
] |
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-0.0569643825,
-0.0642226115,
0.0169170387,
0.1217800826,
-0.007731284,
-0.0409228504,
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0.0292023662,
0.0193741042,
-0.0639966726,
-0.0246977452
] |
801.2647 |
Stefano Pozzorini
|
A.Denner, B.Jantzen, S.Pozzorini
|
Two-loop electroweak Sudakov logarithms for massive fermion scattering
|
To appear in the proceedings of 8th International Symposium on
Radiative Corrections (RADCOR 2007): Application of Quantum Field Theory to
Phenomenology, Florence, Italy, 1-6 Oct 2007
|
PoS (RAD COR 2007) 002
|
10.22323/1.048.0002
|
MPP-2008-8,PSI-PR-08-01
|
hep-ph
| null |
We study the asymptotic behaviour of two-loop electroweak corrections at
energies Q >> M_W, where logarithms of the type ln(Q/M_W) become dominant. The
calculation of the leading and next-to-leading logarithmic terms for massless
and massive fermion-scattering processes is summarized. The derivations are
performed diagrammatically within the spontaneously broken electroweak theory.
We find that the soft and collinear singularities resulting from photons can be
factorized into a QED-like term and that, up to logarithms of the Z-W mass
ratio, the effects of symmetry breaking cancel. This result supports
resummation prescriptions that are based on a symmetric SU(2)xU(1) theory
matched with QED at the electroweak scale.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:01:27 GMT"
}
] | 2018-04-05T00:00:00 |
[
[
"Denner",
"A.",
""
],
[
"Jantzen",
"B.",
""
],
[
"Pozzorini",
"S.",
""
]
] |
[
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] |
801.2648 |
Tomohiro Matsuda
|
Tomohiro Matsuda
|
Modulated Inflation
|
17pages, k^2/a^2 is included, accepted for publication in PLB
|
Phys.Lett.B665:338-343,2008
|
10.1016/j.physletb.2008.06.030
| null |
hep-ph astro-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have studied modulated inflation that generates curvature perturbation
from light-field fluctuation. As discussed in previous works, even if the
fluctuation of the inflaton itself does not generate the curvature perturbation
at the horizon crossing, fluctuation of a light field may induce fluctuation
for the end-line of inflation and this may lead to generation of cosmological
perturbation ``at the end of the inflation''. Our scenario is different from
those that are based on the fluctuations of the boundary of the inflaton
trajectory, as clearly explained in this paper by using the $\delta N$
formalism. In this paper, we will consider the perturbation of the inflaton
velocity that can be induced by a light field other than the inflaton. We also
explain the crucial difference from the standard multi-field inflation model.
We show concrete examples of the modulated inflation scenario in which
non-gaussianity can be generated. We also discuss the running of the
non-gaussianity parameter.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:04:32 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 00:06:25 GMT"
},
{
"version": "v3",
"created": "Fri, 25 Jan 2008 07:20:16 GMT"
},
{
"version": "v4",
"created": "Mon, 14 Apr 2008 02:13:21 GMT"
},
{
"version": "v5",
"created": "Thu, 12 Jun 2008 04:10:37 GMT"
},
{
"version": "v6",
"created": "Sat, 14 Jun 2008 06:49:37 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Matsuda",
"Tomohiro",
""
]
] |
[
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] |
801.2649 |
Hiroyuki Hirashita
|
Hiroyuki Hirashita (1), Takaya Nozawa (2), Tsutomu T. Takeuchi (3)
Takashi Kozasa (2) ((1) Univ. Tsukuba, (2) Hokkaido Univ., (3) Nagoya Univ.)
|
Extinction curves flattened by reverse shocks in supernovae
|
8 pages, 5 figures, Accepted for publication in MNRAS
| null |
10.1111/j.1365-2966.2007.12834.x
| null |
astro-ph
| null |
We investigate the extinction curves of young galaxies in which dust is
supplied from Type II supernovae (SNe II) and/or pair instability supernovae
(PISNe). Since at high redshift (z>5), low-mass stars cannot be dominant
sources for dust grains, SNe II and PISNe, whose progenitors are massive stars
with short lifetimes, should govern the dust production. Here, we theoretically
investigate the extinction curves of dust produced by SNe II and PISNe, taking
into account reverse shock destruction induced by collision with ambient
interstellar medium. We find that the extinction curve is sensitive to the
ambient gas density around a SN, since the efficiency of reverse shock
destruction strongly depends on it. The destruction is particularly efficient
for small-sized grains, leading to a flat extinction curve in the optical and
ultraviolet wavelengths. Such a large ambient density as n_H > 1 cm^{-3}
produces too flat an extinction curve to be consistent with the observed
extinction curve for SDSS J104845.05+463718.3 at z=6.2. Although the extinction
curve is highly sensitive to the ambient density, the hypothesis that the dust
is predominantly formed by SNe at z~6 is still allowed by the current
observational constraints. For further quantification, the ambient density
should be obtained by some other methods. Finally we also discuss the
importance of our results for observations of high-z galaxies, stressing a
possibility of flat extinction curves.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:11:28 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Hirashita",
"Hiroyuki",
"",
"Univ. Tsukuba"
],
[
"Nozawa",
"Takaya",
"",
"Hokkaido Univ"
],
[
"Takeuchi",
"Tsutomu T.",
"",
"Nagoya Univ"
],
[
"Kozasa",
"Takashi",
"",
"Hokkaido Univ"
]
] |
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] |
801.265 |
Adam Parusinski
|
Satoshi Koike, Adam Parusinski
|
Equivalence relations for two variable real analytic function germs
|
30 pages, 7 figures
| null | null | null |
math.AG
| null |
For two variable real analytic function germs we compare the blow-analytic
equivalence in the sense of Kuo to the other natural equivalence relations. Our
main theorem states that $C^1$ equivalent germs are blow-analytically
equivalent. This gives a negative answer to a conjecture of Kuo. In the proof
we show that the Puiseux pairs of real Newton-Puiseux roots are preserved by
the $C^1$ equivalence of function germs. The proof is achieved, being based on
a combinatorial characterisation of blow-analytic equivalence in terms of the
real tree model.
We also give several examples of bi-Lipschitz equivalent germs that are not
blow-analytically equivalent.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:01:33 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Koike",
"Satoshi",
""
],
[
"Parusinski",
"Adam",
""
]
] |
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] |
801.2651 |
Naoum Karchev Prof.
|
N. Karchev
|
Towards the theory of ferrimagnetism
|
9 pages, 8 figures
|
J. Phys.:Condens. Matter 20 (2008) 325219
|
10.1088/0953-8984/20/32/325219
| null |
cond-mat.str-el
| null |
Two-sublattice ferrimagnet, with spin-$s_1$ operators $\bf{S_{1i}}$ at the
sublattice $A$ site and spin-$s_2$ operators $\bf{S_{2i}}$ at the sublattice
$B$ site, is considered. The magnon of the system, the transversal fluctuation
of the total magnetization, is a complicate mixture of the transversal
fluctuations of the sublattice $A$ and $B$ spins. As a result, the magnons'
fluctuations suppress in a different way the magnetic orders of the $A$ and $B$
sublattices and one obtains two phases. At low temperature $(0,T^*)$ the
magnetic orders of the $A$ and $B$ spins contribute to the magnetization of the
system, while at the high temperature $(T^*,T_N)$, the magnetic order of the
spins with a weaker intra-sublattice exchange is suppressed by magnon
fluctuations, and only the spins with stronger intra-sublattice exchange has
non-zero spontaneous magnetization. The $T^*$ transition is a transition
between two spin-ordered phases in contrast to the transition from spin-ordered
state to disordered state ($T_N$-transition). There is no additional symmetry
breaking, and the Goldstone boson has a ferromagnetic dispersion in both
phases. A modified spin-wave theory is developed to describe the two phases.
All known Neel's anomalous $M(T)$ curves are reproduced, in particular that
with "compensation point". The theoretical curves are compared with
experimental ones for sulpho-spinel $MnCr2S_{4-x}Se_{x}$ and rare earth iron
garnets.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:30:44 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Karchev",
"N.",
""
]
] |
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] |
801.2652 |
Groenewegen
|
M.A.T. Groenewegen, A. Udalski, G. Bono
|
The distance to the Galactic Centre based on Population-II Cepheids and
RR Lyrae stars
|
A&A accepted
| null |
10.1051/0004-6361:20079101
| null |
astro-ph
| null |
Context: The distance to the Galactic Centre (GC) is of importance for the
distance scale in the Universe. The value derived by Eisenhauer et al. (2005)
of 7.62 +- 0.32 kpc based on the orbit of one star around the central black
hole is shorter than most other distance estimates based on a variety of
different methods. Aim: To establish an independent distance to the GC with
high accuracy. To this end Population-II Cepheids are used that have been
discovered in the OGLE-II and III surveys. Method: Thirty-nine Pop-II Cepheids
have been monitored on 4 nights spanning 14 days. Light curves have been fitted
using the known periods from the OGLE data to determine the mean K-band
magnitude. It so happens that 37 RR Lyrae stars are in the field-of-views and
mean K-band magnitudes are derived for this sample as well. Results: The
period-luminosity relation of Pop-II Cepheids in the K-band is determined, and
the derived slope of -2.24 +- 0.14 is consistent with the value derived by
Matsunaga et al. (2006). Fixing the slope to their more accurate value results
in a zero point, and implies a distance modulus to the GC of 14.51 +- 0.12,
with an additional systematic uncertainty of 0.07 mag. Similarly, from the RR
Lyrae K-band PL-relation we derive a value of 14.48 +- 0.17 (random) +- 0.07
(syst.). The two independent determinations are averaged to find 14.50 +- 0.10
(random) +- 0.07 (syst.), or 7.94 +- 0.37 +- 0.26 kpc.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:39:08 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Groenewegen",
"M. A. T.",
""
],
[
"Udalski",
"A.",
""
],
[
"Bono",
"G.",
""
]
] |
[
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] |
801.2653 |
Hui Jing
|
H. Jing, J. Cheng, and P. Meystre
|
Quantum Noise in the Collective Abstraction Reaction A+B $_2\to$ AB+B
|
4 pages, 3 figures, published
|
Phys. Rev. Lett. 101, 073603 (2008)
|
10.1103/PhysRevLett.101.073603
| null |
quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate theoretically that the collective abstraction reaction A+B$_2
\to$ AB+B can be realized efficiently with degenerate bosonic or fermionic
matter waves. We show that this is dominated by quantum fluctuations, which are
critical in triggering its initial stages with the appearance of macroscopic
non-classical correlations of the atomic and molecular fields as a result. This
study opens up a promising new regime of quantum degenerate matter-wave
chemistry.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:45:51 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 09:33:30 GMT"
},
{
"version": "v3",
"created": "Thu, 4 Sep 2008 03:23:01 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Jing",
"H.",
""
],
[
"Cheng",
"J.",
""
],
[
"Meystre",
"P.",
""
]
] |
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-0.085877873,
-0.0202244762,
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-0.0982747972,
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] |
801.2654 |
Mioara Mugur-Schachter
|
Mioara Mugur-Schachter
|
On a Crucial Problem in Probabilities and Solution
|
22 pages. Accepted for publication in Information And Computation
| null | null | null |
quant-ph
| null |
First the crucial but very confidential fact is brought into evidence that,
as Kolmogorov himself repeatedly claimed, there exists no abstract theory of
probabilities, simply because the factual concept of probability is itself
unachieved: it is nowhere specified how to construct the factual probability
law to be asserted on a given physical random phenomenon. Then an algorithm of
semantic integration is built that permits to identify this factual probability
law.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:52:12 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Mugur-Schachter",
"Mioara",
""
]
] |
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] |
801.2655 |
Giulio Schimperna
|
Giulio Schimperna
|
Global and exponential attractors for the Penrose-Fife system
| null | null | null | null |
math.AP math.DS
| null |
The Penrose-Fife system for phase transitions is addressed. Dirichlet
boundary conditions for the temperature are assumed. Existence of global and
exponential attractors is proved. Differently from preceding contributions,
here the energy balance equation is both singular at 0 and degenerate at
infinity. For this reason, the dissipativity of the associated dynamical
process is not trivial and has to be proved rather carefully.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:57:24 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Schimperna",
"Giulio",
""
]
] |
[
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] |
801.2656 |
Mahendra K. Verma
|
Mahendra K. Verma, Thomas Lessinnes, Daniele Carati, Ioannis Sarris,
Krishna Kumar, Meenakshi Singh
|
Dynamo Transition in Low-dimensional Models
|
7 pages
|
Phys. Rev. E, v76, 036409 (2008)
|
10.1103/PhysRevE.78.036409
| null |
nlin.CD astro-ph nlin.SI physics.plasm-ph
| null |
Two low-dimensional magnetohydrodynamic models containing three velocity and
three magnetic modes are described. One of them (nonhelical model) has zero
kinetic and current helicity, while the other model (helical) has nonzero
kinetic and current helicity. The velocity modes are forced in both these
models. These low-dimensional models exhibit a dynamo transition at a critical
forcing amplitude that depends on the Prandtl number. In the nonhelical model,
dynamo exists only for magnetic Prandtl number beyond 1, while the helical
model exhibits dynamo for all magnetic Prandtl number. Although the model is
far from reproducing all the possible features of dynamo mechanisms, its
simplicity allows a very detailed study and the observed dynamo transition is
shown to bear similarities with recent numerical and experimental results.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 11:57:54 GMT"
}
] | 2008-12-05T00:00:00 |
[
[
"Verma",
"Mahendra K.",
""
],
[
"Lessinnes",
"Thomas",
""
],
[
"Carati",
"Daniele",
""
],
[
"Sarris",
"Ioannis",
""
],
[
"Kumar",
"Krishna",
""
],
[
"Singh",
"Meenakshi",
""
]
] |
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] |
801.2657 |
Michael Fellhauer
|
M. Fellhauer (1), M.I. Wilkinson (2), N.W. Evans (1), V. Belokurov
(1), M.J. Irwin (1), G. Gilmore (1), D.B. Zucker (1), J.T. Kleyna (3) ((1)
Institute of Astronomy, University of Cambridge, UK; (2) Dept. of Physics and
Astronomy, University of Leicester, UK; (3) Institute for Astronomy,
Honolulu, Hawaii, USA)
|
Modelling the dynamical evolution of the Bootes dwarf spheroidal galaxy
|
10 pages, 7 figures, accepted by MNRAS
| null |
10.1111/j.1365-2966.2008.12921.x
| null |
astro-ph
| null |
We investigate a wide range of possible evolutionary histories for the
recently discovered Bootes dwarf spheroidal galaxy, a Milky Way satellite. By
means of N-body simulations we follow the evolution of possible progenitor
galaxies of Bootes for a variety of orbits in the gravitational potential of
the Milky Way. The progenitors considered cover the range from dark-matter-free
star clusters to massive, dark-matter dominated outcomes of cosmological
simulations. For each type of progenitor and orbit we compare the observable
properties of the remnant after 10 Gyr with those of Bootes observed today. Our
study suggests that the progenitor of Bootes must have been, and remains now,
dark matter dominated. In general our models are unable to reproduce the
observed high velocity dispersion in Bootes without dark matter. Our models do
not support time-dependent tidal effects as a mechanism able to inflate
significantly the internal velocity dispersion. As none of our initially
spherical models is able to reproduce the elongation of Bootes, our results
suggest that the progenitor of Bootes may have had some intrinsic flattening.
Although the focus of the present paper is the Bootes dwarf spheroidal, these
models may be of general relevance to understanding the structure, stability
and dark matter content of all dwarf spheroidal galaxies.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:17:58 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Fellhauer",
"M.",
""
],
[
"Wilkinson",
"M. I.",
""
],
[
"Evans",
"N. W.",
""
],
[
"Belokurov",
"V.",
""
],
[
"Irwin",
"M. J.",
""
],
[
"Gilmore",
"G.",
""
],
[
"Zucker",
"D. B.",
""
],
[
"Kleyna",
"J. T.",
""
]
] |
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-0.0331450738,
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0.0793542117,
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0.0310628098,
-0.0475212522,
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-0.0541388541,
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] |
801.2658 |
Giulio Schimperna
|
Pierluigi Colli, Danielle Hilhorst, Francoise Issard-Roch and Giulio
Schimperna
|
Long time convergence for a class of variational phase field models
| null | null | null | null |
math.AP
| null |
In this paper we analyze a class of phase field models for the dynamics of
phase transitions which extend the well-known Caginalp and Penrose-Fife models.
Existence and uniqueness of the solution to the related initial boundary value
problem are shown. Further regularity of the solution is deduced by exploiting
the so-called regularizing effect. Then, the large time behavior of such a
solution is studied and several convergence properties of the trajectory as
time tends to infinity are discussed.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:15:19 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Colli",
"Pierluigi",
""
],
[
"Hilhorst",
"Danielle",
""
],
[
"Issard-Roch",
"Francoise",
""
],
[
"Schimperna",
"Giulio",
""
]
] |
[
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-0.0752588436,
-0.028870644,
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-0.0730691478,
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] |
801.2659 |
Agnieszka Majczyna
|
A. Majczyna, M. Nalezyty, M. Biskup, G. Wrochna, M. Soko{\l}owski, K.
Nawrocki, K. Ma{\l}ek, L. Mankiewicz, L.W. Piotrowski
|
The catalog of short periods stars from the ''Pi of the Sky'' data
|
New Astronomy in print
|
New Astron.13:414-417,2008
|
10.1016/j.newast.2007.12.006
| null |
astro-ph
| null |
Based on the data from the ''Pi of the Sky'' project we made a catalog of the
variable stars with periods from 0.1 to 10 days. We used data collected during
a period of two years (2004 and 2005) and classified 725 variable stars. Most
of the stars in our catalog are eclipsing binaries - 464 (about 64%), while the
number of pulsating stars is 125 (about 17%). Our classification is based on
the shape of the light curve, as in the GCVS catalog. However, some stars in
our catalog were classified as of different type than in the GCVS catalog. We
have found periods for 15 stars present in the GCVS catalog with previously
unknown period.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:23:45 GMT"
}
] | 2009-06-23T00:00:00 |
[
[
"Majczyna",
"A.",
""
],
[
"Nalezyty",
"M.",
""
],
[
"Biskup",
"M.",
""
],
[
"Wrochna",
"G.",
""
],
[
"Sokołowski",
"M.",
""
],
[
"Nawrocki",
"K.",
""
],
[
"Małek",
"K.",
""
],
[
"Mankiewicz",
"L.",
""
],
[
"Piotrowski",
"L. W.",
""
]
] |
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] |
801.266 |
Philippe Chomaz
|
C. Ducoin (INFN, Sezione di Catania, LPCC, Ganil), J. Margueron
(IPNO), Ph. Chomaz (GANIL)
|
Cluster formation in asymmetric nuclear matter: semi-classical and
quantal approaches
|
27 pages, 11 figures, Submitted to Nuclear Physics A, Nuclear Physics
A In press (2008)
|
Nucl.Phys.A809:30-64,2008
|
10.1016/j.nuclphysa.2008.05.015
| null |
nucl-th
| null |
The nuclear-matter liquid-gas phase transition induces instabilities against
finite-size density fluctuations. This has implications for both
heavy-ion-collision and compact-star physics. In this paper, we study the
clusterization properties of nuclear matter in a scenario of spinodal
decomposition, comparing three different approaches: the quantal RPA, its
semi-classical limit (Vlasov method), and a hydrodynamical framework. The
predictions related to clusterization are qualitatively in good agreement
varying the approach and the nuclear interaction. Nevertheless, it is shown
that i) the quantum effects reduce the instability zone, and disfavor
short-wavelength fluctuations; ii) large differences appear bewteen the two
semi-classical approaches, which correspond respectively to a collisionless
(Vlasov) and local equilibrium description (hydrodynamics); iii) the
isospin-distillation effect is stronger in the local equilibrium framework; iv)
important variations between the predicted time-scales of cluster formation
appear near the borders of the instability region.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:26:34 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jun 2008 08:20:58 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Ducoin",
"C.",
"",
"INFN, Sezione di Catania, LPCC, Ganil"
],
[
"Margueron",
"J.",
"",
"IPNO"
],
[
"Chomaz",
"Ph.",
"",
"GANIL"
]
] |
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0.0151825752,
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-0.0450332649,
-0.0434539914,
-0.0142493676,
-0.1416561753,
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-0.0608260147,
0.0347440504,
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] |
801.2661 |
El Hassan Saidi
|
Lalla Btissam Drissi, Houda Jehjouh, El Hassan Saidi
|
Generalized MacMahon G(q) as q-deformed CFT Correlation Function
|
35 pages, Appendix B shortened, references updated, To appear in NPB
|
Nucl.Phys.B801:316-345,2008
|
10.1016/j.nuclphysb.2008.03.006
|
Lab/UFR-HEP-0801, GNPHE-0801
|
hep-th
| null |
Using $\Gamma_{\pm}(z) $ vertex operators of the $c=1$ two dimensional
conformal field theory, we give a 2d-quantum field theoretical derivation of
the conjectured d- dimensional MacMahon function G$_{d}(q) $. We interpret this
function G$_{d}(q) $ as a $(d+1) $- point correlation function
$\mathcal{G}_{d+1}(z_{0},...,z_{d}) $ of some local vertex operators
$\mathcal{O}%_{j}(z_{j}) $. We determine these operators and show that they are
particular composites of q-deformed hierarchical vertex operators $% \Gamma
_{\pm}^{(p)}$, with a positive integer p. In agreement with literature's
results, we find that G$_{d}(q) $, $d\geq 4$, cannot be the generating
functional of all \textit{d- dimensional} generalized Young diagrams .
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:26:59 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 13:45:12 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Drissi",
"Lalla Btissam",
""
],
[
"Jehjouh",
"Houda",
""
],
[
"Saidi",
"El Hassan",
""
]
] |
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] |
801.2662 |
Christian Krattenthaler
|
Aldo Conca, Christian Krattenthaler, Junzo Watanabe
|
Regular sequences of symmetric polynomials
|
corrected a typo in Lemma 2.4(b)
|
Rend. Sem. Mat. Univ. Padova 121 (2009), 179-199
| null | null |
math.AC math.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Denote by p_k the k-th power sum symmetric polynomial n variables. The
interpretation of the q-analogue of the binomial coefficient as Hilbert
function leads us to discover that n consecutive power sums in n variables form
a regular sequence. We consider then the following problem: describe the
subsets n powersums forming a regular sequence. A necessary condition is that
n! divides the product of the degrees of the elements. To find an easily
verifiable sufficient condition turns out to be surprisingly difficult already
in 3 variables. Given positive integers a<b<c with GCD(a,b,c)=1, we conjecture
that p_a, p_b, p_c is a regular sequence for n=3 if and only if 6 divides abc.
We provide evidence for the conjecture by proving it in several special
instances.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:40:48 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Apr 2008 09:51:03 GMT"
},
{
"version": "v3",
"created": "Wed, 29 Aug 2018 12:09:59 GMT"
}
] | 2018-08-30T00:00:00 |
[
[
"Conca",
"Aldo",
""
],
[
"Krattenthaler",
"Christian",
""
],
[
"Watanabe",
"Junzo",
""
]
] |
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-0.0399622396,
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-0.0196915381,
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] |
801.2663 |
Mikhail Sheftel
|
Y. Nutku and M. B. Sheftel
|
Hamiltonian structure of the complex Monge-Amp\`ere equation
|
5 pages. Misprints in the formula (3.6) are corrected
| null | null | null |
physics.class-ph math-ph math.MP physics.gen-ph
| null |
We discover Hamiltonian structure of the complex Monge-Amp`ere equation when
written in a first order two-component form. We present Lagrangian and
Hamiltonian functions, a symplectic form and the Hamiltonian operator that
determines the Poisson bracket.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:46:50 GMT"
},
{
"version": "v2",
"created": "Sun, 24 Feb 2008 10:04:51 GMT"
}
] | 2008-02-24T00:00:00 |
[
[
"Nutku",
"Y.",
""
],
[
"Sheftel",
"M. B.",
""
]
] |
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] |
801.2664 |
Clemens Berger
|
Clemens Berger and Ieke Moerdijk
|
On the derived category of an algebra over an operad
|
References and remark 2.5 added
|
Georgian Math. J. 16 (2009), 13-28
| null | null |
math.AT math.CT
| null |
We present a general construction of the derived category of an algebra over
an operad and establish its invariance properties. A central role is played by
the enveloping operad of an algebra over an operad.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 12:52:28 GMT"
},
{
"version": "v2",
"created": "Fri, 25 Jan 2008 10:54:58 GMT"
}
] | 2016-04-04T00:00:00 |
[
[
"Berger",
"Clemens",
""
],
[
"Moerdijk",
"Ieke",
""
]
] |
[
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] |
801.2665 |
David Craven
|
David A. Craven
|
Simple Modules for Groups with Abelian Sylow 2-Subgroups are Algebraic
|
9 pages
| null | null | null |
math.RT math.GR
| null |
Let G be a finite group and let p be a prime. A module for G over a field of
characteristic p is called algebraic if it satisfies a polynomial, with
addition and multiplication given by direct sum and tensor product. In some
sense, having this property is equivalent to the tensor structure being 'nice'
for that module.
In this paper we prove that if G is a group with abelian Sylow 2-subgroups,
and p=2, then all simple modules for G are algebraic. We include the conjecture
that this result holds for all abelian 2-blocks.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:00:05 GMT"
},
{
"version": "v2",
"created": "Sun, 18 May 2008 22:31:18 GMT"
}
] | 2008-05-19T00:00:00 |
[
[
"Craven",
"David A.",
""
]
] |
[
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] |
801.2666 |
Jocelyne Troccaz
|
Christophe Reynier (TIMC), Jocelyne Troccaz (TIMC), Philippe Fourneret
(TIMC), Andr\'e Dusserre, C\'ecile Gay-Jeune (CHU-Grenoble radio), Jean-Luc
Descotes, Michel Bolla, Jean-Yves Giraud
|
MRI/TRUS data fusion for prostate brachytherapy. Preliminary results
| null |
Medical Physics 31, 6 (2004) 1568-75
| null | null |
cs.OH
| null |
Prostate brachytherapy involves implanting radioactive seeds (I125 for
instance) permanently in the gland for the treatment of localized prostate
cancers, e.g., cT1c-T2a N0 M0 with good prognostic factors. Treatment planning
and seed implanting are most often based on the intensive use of transrectal
ultrasound (TRUS) imaging. This is not easy because prostate visualization is
difficult in this imaging modality particularly as regards the apex of the
gland and from an intra- and interobserver variability standpoint. Radioactive
seeds are implanted inside open interventional MR machines in some centers.
Since MRI was shown to be sensitive and specific for prostate imaging whilst
open MR is prohibitive for most centers and makes surgical procedures very
complex, this work suggests bringing the MR virtually in the operating room
with MRI/TRUS data fusion. This involves providing the physician with
bi-modality images (TRUS plus MRI) intended to improve treatment planning from
the data registration stage. The paper describes the method developed and
implemented in the PROCUR system. Results are reported for a phantom and first
series of patients. Phantom experiments helped characterize the accuracy of the
process. Patient experiments have shown that using MRI data linked with TRUS
data improves TRUS image segmentation especially regarding the apex and base of
the prostate. This may significantly modify prostate volume definition and have
an impact on treatment planning.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:14:07 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Reynier",
"Christophe",
"",
"TIMC"
],
[
"Troccaz",
"Jocelyne",
"",
"TIMC"
],
[
"Fourneret",
"Philippe",
"",
"TIMC"
],
[
"Dusserre",
"André",
"",
"CHU-Grenoble radio"
],
[
"Gay-Jeune",
"Cécile",
"",
"CHU-Grenoble radio"
],
[
"Descotes",
"Jean-Luc",
""
],
[
"Bolla",
"Michel",
""
],
[
"Giraud",
"Jean-Yves",
""
]
] |
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] |
801.2667 |
Emmanuel Roy
|
Emmanuel Roy (LAGA)
|
Poisson suspensions and infinite ergodic theory
|
18 pages
| null | null | null |
math.DS
| null |
We investigate ergodic theory of Poisson suspensions. In the process, we
establish close connections between finite and infinite measure preserving
ergodic theory. Poisson suspensions thus provide a new approach to infinite
measure preserving ergodic theory. Fields investigated here are mixing
properties, spectral theory, joinings. We also compare Poisson suspensions to
the apparently similar looking Gaussian dynamical systems.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:14:28 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Feb 2008 07:06:42 GMT"
}
] | 2008-02-26T00:00:00 |
[
[
"Roy",
"Emmanuel",
"",
"LAGA"
]
] |
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] |
801.2668 |
Chenggui Yuan
|
Feng-Yu Wang and Chenggui Yuan
|
Poincare Inequality on the Path Space of Poisson Point Processes
| null | null | null | null |
math.PR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The quasi-invariance is proved for the distributions of Poisson point
processes under a random shift map on the path space. This leads to a natural
Dirichlet form of jump type on the path space. Differently from the O-U
Dirichlet form on the Wiener space satisfying the log-Sobolev inequality, this
Dirichlet form merely satisfies the Poincare inequality but not the log-Sobolev
one.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:15:53 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Nov 2008 09:39:20 GMT"
}
] | 2008-11-05T00:00:00 |
[
[
"Wang",
"Feng-Yu",
""
],
[
"Yuan",
"Chenggui",
""
]
] |
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-0.0210488979,
0.0269689001,
0.0240206439,
-0.0416749381,
0.0462558903,
-0.0647911355,
-0.0115404809
] |
801.2669 |
Hendrik Weimer
|
Hendrik Weimer, Mathias Michel, Jochen Gemmer and G\"unter Mahler
|
Transport in anisotropic model systems analyzed by a correlated
projection superoperator technique
|
8 pages, 6 figures
|
Phys. Rev. E 77, 011118 (2008)
|
10.1103/PhysRevE.77.011118
| null |
quant-ph cond-mat.mes-hall cond-mat.stat-mech
| null |
By using a correlated projection operator, the time-convolutionless (TCL)
method to derive a quantum master equation can be utilized to investigate the
transport behavior of quantum systems as well. Here, we analyze a
three-dimensional anisotropic quantum model system according to this technique.
The system consists of Heisenberg coupled two-level systems in one direction
and weak random interactions in all other ones. Depending on the partition
chosen, we obtain ballistic behavior along the chains and normal transport in
the perpendicular direction. These results are perfectly confirmed by the
numerical solution of the full time-dependent Schr\"odinger equation.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:18:00 GMT"
}
] | 2008-01-18T00:00:00 |
[
[
"Weimer",
"Hendrik",
""
],
[
"Michel",
"Mathias",
""
],
[
"Gemmer",
"Jochen",
""
],
[
"Mahler",
"Günter",
""
]
] |
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-0.0998091623,
0.0315145068,
0.1436278224,
-0.0457238145,
-0.0701733604,
-0.0027733955,
0.0227296054,
0.0100616207,
0.00806385,
0.0454062894,
-0.0338694938,
-0.0748304129,
-0.1589749306,
0.1262696981,
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-0.0912888721,
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-0.0013594104,
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0.0172522739,
-0.0230471324,
0.0202687755,
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-0.0200306308,
-0.0480788052,
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] |
801.267 |
Santanu Maiti Kumar
|
Shreekantha Sil, Santanu K. Maiti and Arunava Chakrabarti
|
Metal-insulator transition in an aperiodic ladder network: an exact
result
|
4 pages, 3 figures
|
Physical Review Letters, Volume 101, Page 076803 (2008)
|
10.1103/PhysRevLett.101.076803
| null |
cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show, in a completely analytical way, that a tight binding ladder network
composed of atomic sites with on-site potentials distributed according to the
quasiperiodic Aubry model can exhibit a metal-insulator transition at multiple
values of the Fermi energy. For specific values of the first and second
neighbor electron hopping, the result is obtained exactly. With a more general
model, we calculate the two-terminal conductance numerically. The numerical
results corroborate the analytical findings and yield a richer variety of
spectrum showing multiple mobility edges.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:27:11 GMT"
},
{
"version": "v2",
"created": "Thu, 1 May 2008 05:04:40 GMT"
},
{
"version": "v3",
"created": "Fri, 20 Jun 2008 12:39:58 GMT"
},
{
"version": "v4",
"created": "Tue, 15 Jul 2008 11:16:47 GMT"
}
] | 2008-08-19T00:00:00 |
[
[
"Sil",
"Shreekantha",
""
],
[
"Maiti",
"Santanu K.",
""
],
[
"Chakrabarti",
"Arunava",
""
]
] |
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] |
801.2671 |
Do-Hyung Kim
|
Do-Hyung Kim
|
A Note on Non-compact Cauchy surface
| null |
Class.Quant.Grav.25:238002,2008
|
10.1088/0264-9381/25/23/238002
| null |
gr-qc
| null |
It is shown that if a space-time has non-compact Cauchy surface, then its
topological, differentiable, and causal structure are completely determined by
a class of compact subsets of its Cauchy surface. Since causal structure
determines its topological, differentiable, and conformal structure of
space-time, this gives a natural way to encode the corresponding structures
into its Cauchy surface.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:34:22 GMT"
}
] | 2008-11-26T00:00:00 |
[
[
"Kim",
"Do-Hyung",
""
]
] |
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] |
801.2672 |
Brouet Veronique
|
V. Brouet, W.L. Yang, X.J. Zhou, Z. Hussain, R.G. Moore, R. He, D.H.
Lu, Z.X. Shen, J. Laverock, S. Dugdale, N. Ru and I.R. Fisher
|
ARPES Study of the Evolution of Band Structure and Charge Density Wave
Properties in RTe3 for R = Y, La, Ce, Sm, Gd, Tb and Dy
|
18 pages, 25 figures
| null |
10.1103/PhysRevB.77.235104
| null |
cond-mat.str-el
| null |
We present a detailed ARPES investigation of the RTe3 family, which sets this
system as an ideal "textbook" example for the formation of a nesting driven
Charge Density Wave (CDW). This family indeed exhibits the full range of
phenomena that can be associated to CDW instabilities, from the opening of
large gaps on the best nested parts of Fermi Surface (FS) (up to 0.4eV), to the
existence of residual metallic pockets. ARPES is the best suited technique to
characterize these features, thanks to its unique ability to resolve the
electronic structure in k-space. An additional advantage of RTe3 is that the
band structure can be very accurately described by a simple 2D tight-binding
(TB) model, which allows one to understand and easily reproduce many
characteristics of the CDW. In this paper, we first establish the main features
of the electronic structure, by comparing our ARPES measurements with Linear
Muffin-Tin Orbital band calculations. We use this to define the validity and
limits of the TB model. We then present a complete description of the CDW
properties and, for the first time, of their strong evolution as a function of
R. Using simple models, we are able to reproduce perfectly the evolution of
gaps in k-space, the evolution of the CDW wave vector with R and the shape of
the residual metallic pockets. Finally, we give an estimation of the CDW
interaction parameters and find that the change in the electronic density of
states n(Ef), due to lattice expansion when different R ions are inserted, has
the correct order of magnitude to explain the evolution of the CDW properties.
|
[
{
"version": "v1",
"created": "Thu, 17 Jan 2008 13:43:08 GMT"
}
] | 2009-11-13T00:00:00 |
[
[
"Brouet",
"V.",
""
],
[
"Yang",
"W. L.",
""
],
[
"Zhou",
"X. J.",
""
],
[
"Hussain",
"Z.",
""
],
[
"Moore",
"R. G.",
""
],
[
"He",
"R.",
""
],
[
"Lu",
"D. H.",
""
],
[
"Shen",
"Z. X.",
""
],
[
"Laverock",
"J.",
""
],
[
"Dugdale",
"S.",
""
],
[
"Ru",
"N.",
""
],
[
"Fisher",
"I. R.",
""
]
] |
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