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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0708.0949 | Jan Palou\v{s} | Jan Palou\v{s} | The Evolution of Galaxies | 9 pages, no figures, invited lecture at the School "Helioshpere and
Galaxy" | Rom.Astron.J.17:,2007 | null | null | astro-ph | null | The evolution of galaxies results from a combination of internal and external
processes. The star formation is an internal process transforming cold and
dense cores of molecular clouds to stars. It may be triggered internally by
expanding shells, or externally, e. g. by galaxy collisions. The gas accretion
and galaxy merging events are external contributors to galaxy evolution. They
compete with another internal process of galaxy evolution, which is the secular
evolution redistributing the mass and angular momentum inside of galaxies as a
consequence of bar and spiral arms formation. As a nearby example of gas
accretion we mention the interacting system Milky Way - Large and Small
Magellanic Clouds. Stripping of ISM in galaxy clusters is reviewed as another
example of interaction of galaxies with their environment.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:07:01 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Palouš",
"Jan",
""
]
] |
0708.0950 | Daniel Mazur | Daniel Mazur, K. E. Gray, J. F. Zasadzinski, L. Ozyuzer, I. S.
Beloborodov, H. Zheng, J. F. Mitchell | Characteristic Energy of the Coulomb Interactions and the Pileup of
States | 4 pages, 4 figures, submitted to PRL | Phys. Rev. B 76, 193102 (2007) | 10.1103/PhysRevB.76.193102 | null | cond-mat.str-el cond-mat.mtrl-sci | null | Tunneling data on $\mathrm{La_{1.28}Sr_{1.72}Mn_2O_7}$ crystals confirm
Coulomb interaction effects through the $\sqrt{\mathrm{E}}$ dependence of the
density of states. Importantly, the data and analysis at high energy, E, show a
pileup of states: most of the states removed from near the Fermi level are
found between ~40 and 130 meV, from which we infer the possibility of universal
behavior. The agreement of our tunneling data with recent photoemission results
further confirms our analysis.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 13:46:52 GMT"
}
] | 2008-03-05T00:00:00 | [
[
"Mazur",
"Daniel",
""
],
[
"Gray",
"K. E.",
""
],
[
"Zasadzinski",
"J. F.",
""
],
[
"Ozyuzer",
"L.",
""
],
[
"Beloborodov",
"I. S.",
""
],
[
"Zheng",
"H.",
""
],
[
"Mitchell",
"J. F.",
""
]
] |
0708.0951 | Nicholas Bate | Nicholas F. Bate, Rachel L. Webster, Stuart Wyithe | Smooth matter and source size in microlensing simulations of
gravitationally lensed quasars | 6 pages, 6 figures. To be published in MNRAS | null | 10.1111/j.1365-2966.2007.12330.x | null | astro-ph | null | Several gravitationally lensed quasars are observed with anomalous
magnifications in pairs of images that straddle a critical curve. Simple
theoretical arguments suggest that the magnification of these images should be
approximately equivalent, whereas one image is observed to be significantly
demagnified. Microlensing provides a possible explanation for this discrepancy.
There are two key parameters when modelling this effect. The first, the
fraction of smooth matter in the lens at the image positions, has been explored
by Schechter and Wambsganss (2002). They have shown that the anomalous flux
ratio observed in the lensed quasar MG 0414+0534 is a priori a factor of 5 more
likely if the assumed smooth matter content in the lens model is increased from
0% to 93%. The second parameter, the size of the emission region, is explored
in this paper, and shown to be more significant. We find that the broadening of
the magnification probability distributions due to smooth matter content is
washed out for source sizes that are predicted by standard models for quasars.
We apply our model to the anomalous lensed quasar MG 0414+0534, and find a 95%
upper limit of 2.62 x 10^(16) h^(-1/2) (M/Msun)^(1/2) cm on the radius of the
I-band emission region. The smooth matter percentage in the lens is
unconstrained.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:03:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bate",
"Nicholas F.",
""
],
[
"Webster",
"Rachel L.",
""
],
[
"Wyithe",
"Stuart",
""
]
] |
0708.0952 | Kavita Ramanan | Haya Kaspi and Kavita Ramanan | Law of Large Numbers Limits for Many Server Queues | 57 pages | null | null | null | math.PR math.AP | null | This work considers a many-server queueing system in which customers with
i.i.d., generally distributed service times enter service in the order of
arrival. The dynamics of the system is represented in terms of a process that
describes the total number of customers in the system, as well as a
measure-valued process that keeps track of the ages of customers in service.
Under mild assumptions on the service time distribution, as the number of
servers goes to infinity, a law of large numbers (or fluid) limit is
established for this pair of processes. The limit is characterised as the
unique solution to a coupled pair of integral equations, which admits a fairly
explicit representation. As a corollary, the fluid limits of several other
functionals of interest, such as the waiting time, are also obtained.
Furthermore, in the time-homogeneous setting, the fluid limit is shown to
converge to its equilibrium. Along the way, some results of independent
interest are obtained, including a continuous mapping result and a maximality
property of the fluid limit. A motivation for studying these systems is that
they arise as models of computer data systems and call centers.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 13:55:51 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Kaspi",
"Haya",
""
],
[
"Ramanan",
"Kavita",
""
]
] |
0708.0953 | Bing Jiang | Bing Jiang, Yang Chen, and Q. Daniel Wang | Chandra View of DA 530: A Sub-Energetic Supernova Remnant with a Pulsar
Wind Nebula? | 23 pages, 7 figures, accepted for publication in ApJ; complete the
abstract on astro-ph and correct some typos | null | 10.1086/522299 | null | astro-ph | null | Based on a Chandra ACIS observation, we report the detection of an extended
X-ray feature close to the center of the remnant DA 530 with 5.3 sigma above
the background within a circle of 20'' radius. This feature, characterized by a
power-law with the photon index gamma=1.6+-0.8 and spatially coinciding with a
nonthermal radiosource, most likely represents a pulsar wind nebula. We have
further examined the spectrum of the diffuse X-ray emission from the remnant
interior with a background-subtracted count rate of ~0.06 counts s^-1 in
0.3-3.5 keV. The spectrum of the emission can be described by a thermal plasma
with a temperature of ~0.3-0.6 keV and a Si over-abundance of >~7 solar. These
spectral characteristics, together with the extremely low X-ray luminosity,
suggest that the remnant arises from a supernova with an anomalously low
mechanical energy (<10^50 ergs). The centrally-filled thermal X-ray emission of
the remnant may indicate an early thermalization of the SN ejecta by the
circum-stellar medium. Our results suggest that the remnant is likely the
product of a core-collapsed SN with a progenitor mass of 8-12 Msun. Similar
remnants are probably common in the Galaxy, but have rarely been studied.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 13:56:23 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 18:19:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jiang",
"Bing",
""
],
[
"Chen",
"Yang",
""
],
[
"Wang",
"Q. Daniel",
""
]
] |
0708.0954 | Nuno C. Santos | N.C. Santos, M. Mayor, F. Bouchy, F. Pepe, D. Queloz, S. Udry | The HARPS search for southern extra-solar planets XII. A giant planet
orbiting the metal-poor star HD171028 | 7 pages, 4 figures, accepted for publication in A&A | null | 10.1051/0004-6361:20078129 | null | astro-ph | null | In this paper we present the detection of a 1.8 M_Jup planet in a 538 day
period trajectory orbiting the metal-poor star HD171028 ([Fe/H]=-0.49). This
planet is the first to be discovered in the context of a HARPS program
searching for planets around metal-poor stars. Interestingly, HD171028 is one
of the least metal-poor stars in the sample. This discovery is placed in the
context of the models of planet formation and evolution.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 13:59:56 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Santos",
"N. C.",
""
],
[
"Mayor",
"M.",
""
],
[
"Bouchy",
"F.",
""
],
[
"Pepe",
"F.",
""
],
[
"Queloz",
"D.",
""
],
[
"Udry",
"S.",
""
]
] |
0708.0955 | Anton Zeitlin | Anton M. Zeitlin | Formal Maurer-Cartan Structures: from CFT to Classical Field Equations | LaTeX2e, 26 pages; typos corrected, references added | JHEP 0712:098,2007 | 10.1088/1126-6708/2007/12/098 | null | hep-th math-ph math.DG math.MP | null | We show how the well-known classical field equations as Einstein and
Yang-Mills ones, which arise as the conformal invariance conditions of certain
two-dimensional theories, expanded up to the second order in the formal
parameter, can be reformulated as Generalized/formal Maurer-Cartan equations
(GMC), where the differential is the BRST operator of String theory. We
introduce the bilinear operations which are present in GMC, and study their
properties, allowing us to find the symmetries of the resulting equations which
will be naturally identified with the diffeomorphism and gauge symmetries of
Einstein and Yang-Mills equations correspondingly.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:01:12 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 20:09:13 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Zeitlin",
"Anton M.",
""
]
] |
0708.0956 | Matteo G. A. Paris | Stefano Olivares and Matteo G. A. Paris | Quantum estimation via minimum Kullback entropy principle | 7 pages, slightly revised version, no figures | Phys. Rev. A 76, 042120 (2007) | 10.1103/PhysRevA.76.042120 | null | quant-ph | null | We address quantum estimation in situations where one has at disposal data
from the measurement of an incomplete set of observables and some a priori
information on the state itself. By expressing the a priori information in
terms of a bias toward a given state the problem may be faced by minimizing the
quantum relative entropy (Kullback entropy) with the constraint of reproducing
the data. We exploit the resulting minimum Kullback entropy principle for the
estimation of a quantum state from the measurement of a single observable,
either from the sole mean value or from the complete probability distribution,
and apply it as a tool for the estimation of weak Hamiltonian processes. Qubit
and harmonic oscillator systems are analyzed in some details.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:02:45 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 13:02:13 GMT"
},
{
"version": "v3",
"created": "Tue, 2 Oct 2007 20:33:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Olivares",
"Stefano",
""
],
[
"Paris",
"Matteo G. A.",
""
]
] |
0708.0957 | Peter B. Gilkey | M. Brozos-Vazquez, B. Fiedler, E. Garcia-Rio, P. Gilkey, S. Nikcevic,
G. Stanilov, Y. Tsankov, R. Vazquez-Lorenzo, and V. Videv | Stanilov-Tsankov-Videv Theory | This is a contribution to the Proceedings of the 2007 Midwest
Geometry Conference in honor of Thomas P. Branson, published in SIGMA
(Symmetry, Integrability and Geometry: Methods and Applications) at
http://www.emis.de/journals/SIGMA/ | SIGMA 3 (2007), 095, 13 pages | 10.3842/SIGMA.2007.095 | null | math.DG | null | We survey some recent results concerning Stanilov-Tsankov-Videv theory,
conformal Osserman geometry, and Walker geometry which relate algebraic
properties of the curvature operator to the underlying geometry of the
manifold.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:27:25 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Sep 2007 11:25:02 GMT"
}
] | 2008-04-25T00:00:00 | [
[
"Brozos-Vazquez",
"M.",
""
],
[
"Fiedler",
"B.",
""
],
[
"Garcia-Rio",
"E.",
""
],
[
"Gilkey",
"P.",
""
],
[
"Nikcevic",
"S.",
""
],
[
"Stanilov",
"G.",
""
],
[
"Tsankov",
"Y.",
""
],
[
"Vazquez-Lorenzo",
"R.",
""
],
[
"Videv",
"V.",
""
]
] |
0708.0958 | J\"org Reichardt | Joerg Reichardt and Douglas R. White | Role models for complex networks | null | EPJB, 60(2),pp.217-224, (2007) | 10.1140/epjb/e2007-00340-y | null | physics.soc-ph physics.data-an | null | We present a framework for automatically decomposing ("block-modeling") the
functional classes of agents within a complex network. These classes are
represented by the nodes of an image graph ("block model") depicting the main
patterns of connectivity and thus functional roles in the network. Using a
first principles approach, we derive a measure for the fit of a network to any
given image graph allowing objective hypothesis testing. From the properties of
an optimal fit, we derive how to find the best fitting image graph directly
from the network and present a criterion to avoid overfitting. The method can
handle both two-mode and one-mode data, directed and undirected as well as
weighted networks and allows for different types of links to be dealt with
simultaneously. It is non-parametric and computationally efficient. The
concepts of structural equivalence and modularity are found as special cases of
our approach. We apply our method to the world trade network and analyze the
roles individual countries play in the global economy.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:28:55 GMT"
}
] | 2008-12-11T00:00:00 | [
[
"Reichardt",
"Joerg",
""
],
[
"White",
"Douglas R.",
""
]
] |
0708.0959 | David Madigan | Susana Eyheramendy, David Madigan | A flexible Bayesian generalized linear model for dichotomous response
data with an application to text categorization | Published at http://dx.doi.org/10.1214/074921707000000067 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 76-91 | 10.1214/074921707000000067 | IMS-LNMS54-LNMS5406 | stat.ME | null | We present a class of sparse generalized linear models that include probit
and logistic regression as special cases and offer some extra flexibility. We
provide an EM algorithm for learning the parameters of these models from data.
We apply our method in text classification and in simulated data and show that
our method outperforms the logistic and probit models and also the elastic net,
in general by a substantial margin.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:29:19 GMT"
}
] | 2007-08-22T00:00:00 | [
[
"Eyheramendy",
"Susana",
""
],
[
"Madigan",
"David",
""
]
] |
0708.0960 | Mauro Paternostro | R. Prevedel, M. S. Tame, A. Stefanov, M. Paternostro, M. S. Kim, and
A. Zeilinger | Experimental Demonstration of Decoherence-Free One-Way Information
Transfer | 5 pages, 3 figures, RevTeX4 | Phys. Rev. Lett. 99, 250503 (2007) | 10.1103/PhysRevLett.99.250503 | null | quant-ph | null | We report the experimental demonstration of a one-way quantum protocol
reliably operating in the presence of decoherence. Information is protected by
designing an appropriate decoherence-free subspace for a cluster state
resource. We demonstrate our scheme in an all-optical setup, encoding the
information into the polarization states of four photons. A measurement-based
one-way information-transfer protocol is performed with the photons exposed to
severe symmetric phase-damping noise. Remarkable protection of information is
accomplished, delivering nearly ideal outcomes.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:31:41 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Dec 2007 11:41:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Prevedel",
"R.",
""
],
[
"Tame",
"M. S.",
""
],
[
"Stefanov",
"A.",
""
],
[
"Paternostro",
"M.",
""
],
[
"Kim",
"M. S.",
""
],
[
"Zeilinger",
"A.",
""
]
] |
0708.0961 | Paul Navr\'atil | Paul Arthur Navr\'atil, Jarrett L. Johnson, and Volker Bromm | Visualization of Cosmological Particle-Based Datasets | 7 pages, to appear in IEEE Transactions on Visualization and Computer
Graphics (Proceedings of IEEE Visualization 2007), Nov/Dec 2007. See also
http://www.tacc.utexas.edu/~pnav/FirstStars/ | null | null | null | astro-ph | null | We describe our visualization process for a particle-based simulation of the
formation of the first stars and their impact on cosmic history. The dataset
consists of several hundred time-steps of point simulation data, with each
time-step containing approximately two million point particles. For each
time-step, we interpolate the point data onto a regular grid using a method
taken from the radiance estimate of photon mapping. We import the resulting
regular grid representation into ParaView, with which we extract isosurfaces
across multiple variables. Our images provide insights into the evolution of
the early universe, tracing the cosmic transition from an initially homogeneous
state to one of increasing complexity. Specifically, our visualizations capture
the build-up of regions of ionized gas around the first stars, their evolution,
and their complex interactions with the surrounding matter. These observations
will guide the upcoming James Webb Space Telescope, the key astronomy mission
of the next decade.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:58:45 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Navrátil",
"Paul Arthur",
""
],
[
"Johnson",
"Jarrett L.",
""
],
[
"Bromm",
"Volker",
""
]
] |
0708.0962 | Payman Kassaei | Payman L. Kassaei | Overconvergence and classicality: the case of curves | null | null | null | null | math.NT math.AG | null | Given our set-up of a system of curves and maps between them satisfying
certain assumptions, we prove a classicality criterion for overconvergent
sections of line bundles over these curves. As a result, we prove such criteria
for overconvergent modular forms over various Shimura curves. In particular, we
provide a classicality criterion for overconvergent modular forms studied in
[Kassaei: P-adic modular forms over Shimura curves over totally real fields,
Compositio Math. 140 (2004), no 2, 359-395] and their higher-level
generalizations.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:31:52 GMT"
},
{
"version": "v2",
"created": "Wed, 2 Jan 2008 18:09:23 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Jan 2008 01:49:19 GMT"
},
{
"version": "v4",
"created": "Mon, 11 Feb 2008 18:11:26 GMT"
}
] | 2008-02-11T00:00:00 | [
[
"Kassaei",
"Payman L.",
""
]
] |
0708.0963 | William Panduro Vazquez | The BABAR Collaboration: B. Aubert, et al | Search for the rare charmless hadronic decay B+ -> a0+ pi0 | 8 pages, 12 postscript figures, submitted to PRD-RC and Lepton Photon
2007 | Phys.Rev.D77:011101,2008; Erratum-ibid.D77:039903,2008;
Erratum-ibid.D77:019904,2008 | 10.1103/PhysRevD.77.011101 10.1103/PhysRevD.77.039903
10.1103/PhysRevD.77.019904 | BABAR-PUB-07/035, SLAC-PUB-12705 | hep-ex | null | We present a search for B decays to a charged scalar meson a0+ and a pi0
where the a0+ decays to an eta meson and a pi+. The analysis was performed on a
data sample consisting of 383x10-6 BBbar pairs collected with the Babar
detector at the PEP-II asymmetric-energy B Factory at SLAC. We find no
significant signal and set an upper limit on the product branching fraction
BF[(B+ -> a0+ pi0) x (a0+ -> eta pi+)] of 1.4x10-6 at the 90% confidence level.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:32:13 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.0964 | Colm \'O D\'unlaing | Colm O Dunlaing | Nodally 3-connected planar graphs and convex combination mappings | 27 pages Latex, 11 postscript figures | null | null | TCDMATH 06-16 | cs.CG | null | A convex combination mapping of a planar graph is a plane mapping in which
the external vertices are mapped to the corners of a convex polygon and every
internal vertex is a proper weighted average of its neighbours. If a planar
graph is nodally 3-connected or triangulated then every such mapping is an
embedding (Tutte, Floater).
We give a simple characterisation of nodally 3-connected planar graphs, and
generalise the above result to any planar graph which admits any convex
embedding.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:32:38 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Dunlaing",
"Colm O",
""
]
] |
0708.0965 | Doron Cohen | Doron Cohen and Baruch Horovitz | Dephasing of a particle in a dissipative environment | 18 pages, 2 figures, some textual improvements, to be published in
JPA | J. Phys. A 40 12281 (2007). | 10.1088/1751-8113/40/41/002 | null | cond-mat.mes-hall | null | The motion of a particle in a ring of length L is influenced by a dirty metal
environment whose fluctuations are characterized by a short correlation
distance $\ell << L$. We analyze the induced decoherence process, and compare
the results with those obtained in the opposing Caldeira-Leggett limit ($\ell
>> L$). A proper definition of the dephasing factor that does not depend on a
vague semiclassical picture is employed. Some recent Monte-Carlo results about
the effect of finite temperatures on "mass renormalization" in this system are
illuminated.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:32:46 GMT"
},
{
"version": "v2",
"created": "Wed, 19 Sep 2007 09:43:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cohen",
"Doron",
""
],
[
"Horovitz",
"Baruch",
""
]
] |
0708.0966 | Keiichi Maeda | P.A. Mazzali, K.S. Kawabata, K. Maeda, R.J. Foley, K. Nomoto, J. Deng,
T. Suzuki, M. Iye, N. Kashikawa, Y. Ohyama, A.V. Filippenko, Y.Qiu, J. Wei | The Aspherical Properties of the Energetic Type Ic SN 2002ap as Inferred
from its Nebular Spectra | 24 pages, 6 figures, 2 Tables. Accepted by the Astrophysical Journal | null | 10.1086/521873 | null | astro-ph | null | The nebular spectra of the broad-lined, SN 1998bw-like Type Ic SN 2002ap are
studied by means of synthetic spectra. Two different modelling techniques are
employed. In one technique, the SN ejecta are treated as a single zone, while
in the other a density and abundance distribution in velocity is used from an
explosion model. In both cases, heating caused by gamma-ray and positron
deposition is computed (in the latter case using a Monte Carlo technique to
describe the propagation of gamma-rays and positrons), as is cooling via
forbidden-line emission. The results are compared, and although general
agreement is found, the stratified models are shown to reproduce the observed
line profiles much more accurately than the single-zone model. The explosion
produced ~ 0.1 Msun of 56Ni. The distribution in velocity of the various
elements is in agreement with that obtained from the early-time models, which
indicated an ejected mass of ~ 2.5 Msun with a kinetic energy of 4 x 10^{51}
erg. Nebular spectroscopy confirms that most of the ejected mass (~ 1.2 Msun)
was oxygen. The presence of an oxygen-rich inner core, combined with that of
56Ni at high velocities as deduced from early-time models, suggests that the
explosion was asymmetric, especially in the inner part.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:44:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mazzali",
"P. A.",
""
],
[
"Kawabata",
"K. S.",
""
],
[
"Maeda",
"K.",
""
],
[
"Foley",
"R. J.",
""
],
[
"Nomoto",
"K.",
""
],
[
"Deng",
"J.",
""
],
[
"Suzuki",
"T.",
""
],
[
"Iye",
"M.",
""
],
[
"Kashikawa",
"N.",
""
],
[
"Ohyama",
"Y.",
""
],
[
"Filippenko",
"A. V.",
""
],
[
"Qiu",
"Y.",
""
],
[
"Wei",
"J.",
""
]
] |
0708.0967 | Oleg Kirillov | Oleg N. Kirillov | How to play a disc brake | 25 pages, 9 figures, Presented at BIRS 07w5068 Workshop "Geometric
Mechanics: Continuous and discrete, finite and infinite dimensional", August
12-17, 2007, Banff, Canada | Proceedings of the Royal Society A, Volume 464, Number 2097, Pages
2321-2339 / September 08, 2008 | 10.1098/rspa.2008.0021 | null | math-ph math.MP nlin.PS physics.class-ph | null | We consider a gyroscopic system under the action of small dissipative and
non-conservative positional forces, which has its origin in the models of
rotating bodies of revolution being in frictional contact. The spectrum of the
unperturbed gyroscopic system forms a "spectral mesh" in the plane "frequency
-gyroscopic parameter" with double semi-simple purely imaginary eigenvalues at
zero value of the gyroscopic parameter. It is shown that dissipative forces
lead to the splitting of the semi-simple eigenvalue with the creation of the
so-called "bubble of instability" - a ring in the three-dimensional space of
the gyroscopic parameter and real and imaginary parts of eigenvalues, which
corresponds to complex eigenvalues. In case of full dissipation with a
positive-definite damping matrix the eigenvalues of the ring have negative real
parts making the bubble a latent source of instability because it can "emerge"
to the region of eigenvalues with positive real parts due to action of both
indefinite damping and non-conservative positional forces. In the paper, the
instability mechanism is analytically described with the use of the
perturbation theory of multiple eigenvalues. As an example stability of a
rotating circular string constrained by a stationary load system is studied in
detail. The theory developed seems to give a first clear explanation of the
mechanism of self-excited vibrations in the rotating structures in frictional
contact, that is responsible for such well-known phenomena of acoustics of
friction as the squealing disc brake and the singing wine glass.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:51:15 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 19:46:07 GMT"
}
] | 2010-05-04T00:00:00 | [
[
"Kirillov",
"Oleg N.",
""
]
] |
0708.0968 | Javier Cabrera | Javier Cabrera, Ching-Ray Yu | Estimating the proportion of differentially expressed genes in
comparative DNA microarray experiments | Published at http://dx.doi.org/10.1214/074921707000000076 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 92-102 | 10.1214/074921707000000076 | IMS-LNMS54-LNMS5407 | stat.ME | null | DNA microarray experiments, a well-established experimental technique, aim at
understanding the function of genes in some biological processes. One of the
most common experiments in functional genomics research is to compare two
groups of microarray data to determine which genes are differentially
expressed. In this paper, we propose a methodology to estimate the proportion
of differentially expressed genes in such experiments. We study the performance
of our method in a simulation study where we compare it to other standard
methods. Finally we compare the methods in real data from two toxicology
experiments with mice.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:53:31 GMT"
}
] | 2007-08-22T00:00:00 | [
[
"Cabrera",
"Javier",
""
],
[
"Yu",
"Ching-Ray",
""
]
] |
0708.0969 | Mark Tame | M. S. Tame, M. Paternostro and M. S. Kim | One-way quantum computing in a decoherence-free subspace | 9 pages, 4 figures, RevTeX4 | New J. Phys. 9, 201 (2007) | 10.1088/1367-2630/9/6/201 | null | quant-ph | null | We introduce a novel scheme for one-way quantum computing (QC) based on the
use of information encoded qubits in an effective cluster state resource. With
the correct encoding structure, we show that it is possible to protect the
entangled resource from phase damping decoherence, where the effective cluster
state can be described as residing in a Decoherence-Free Subspace (DFS) of its
supporting quantum system. One-way QC then requires either single or two-qubit
adaptive measurements. As an example where this proposal can be realized, we
describe an optical lattice setup where the scheme provides robust quantum
information processing. We also outline how one can adapt the model to provide
protection from other types of decoherence.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:54:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tame",
"M. S.",
""
],
[
"Paternostro",
"M.",
""
],
[
"Kim",
"M. S.",
""
]
] |
0708.0970 | Keiichi Maeda | Keiichi Maeda | Supernovae in Three-Dimension: A Link to Gamma-Ray Bursts | 6 pages, 3 figures. Invited talk at "Frascati Workshop 2007:
Multifrequency Behaviour of High Energy Cosmic Sources", 28 May - 2 June,
2007, Vulcano, Italy. To apper in the Chinese Journal of Astronomy and
Astrophysics (ChJAA) | null | null | null | astro-ph | null | Observational consequences of a jet-driven supernova (SN) explosion model are
presented. The results are compared in detail with optical observations of SN
1998bw associated with a Gamma-Ray Burst. It is shown that the jet model is
able to reproduce virtually all the optical observations available for this SN,
although a spherical model fails to explain some of observed features. Because
of the viewing angle effect, the required kinetic energy of the SN ejecta is
reduced to ~ 2 x 10^{52} erg as compared to that obtained by the previous
spherical model (~ 5 x 10^{52} erg), but this is still much larger than that of
a canonical SN (~10^{51} erg).
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 14:57:54 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Maeda",
"Keiichi",
""
]
] |
0708.0971 | Urko Reinosa | U. Reinosa, J. Serreau | Ward Identities for the 2PI effective action in QED | 33 pages, 2 figures | JHEP 0711:097,2007 | 10.1088/1126-6708/2007/11/097 | null | hep-th | null | We study the issue of symmetries and associated Ward-like identities in the
context of two-particle-irreducible (2PI) functional techniques for abelian
gauge theories. In the 2PI framework, the $n$-point proper vertices of the
theory can be obtained in various different ways which, although equivalent in
the exact theory, differ in general at finite approximation order. We derive
generalized (2PI) Ward identities for these various $n$-point functions and
show that such identities are exactly satisfied at any approximation order in
2PI QED. In particular, we show that 2PI-resummed vertex functions, i.e.
field-derivatives of the so-called 2PI-resummed effective action, exactly
satisfy standard Ward identities. We identify another set of $n$-point
functions in the 2PI framework which exactly satisfy the standard Ward
identities at any approximation order. These are obtained as field-derivatives
of the two-point function $\bcG^{-1}[\phi]$, which defines the extremum of the
2PI effective action. We point out that the latter is not constrained by the
underlying symmetry. As a consequence, the well-known fact that the
corresponding gauge-field polarization tensor is not transverse in momentum
space for generic approximations does not constitute a violation of (2PI) Ward
identities. More generally, our analysis demonstrates that approximation
schemes based on 2PI functional techniques respect all the Ward identities
associated with the underlying abelian gauge symmetry. Our results apply to
arbitrary linearly realized global symmetries as well.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:48:18 GMT"
},
{
"version": "v2",
"created": "Thu, 31 Jan 2008 13:21:24 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Reinosa",
"U.",
""
],
[
"Serreau",
"J.",
""
]
] |
0708.0972 | Keiichi Maeda | Keiichi Maeda | Probing the Explosion Mechanism of Supernovae by Radioactive Decay
Gamma- and X-Rays | 4 pages, 3 figures, 1 table. Proceedings of "The Extreme Universe in
the Suzaku Era". Slightly revised version | null | null | null | astro-ph | null | Gamma- and X-rays resulting from radioactive decays provide a potentially
powerful tool to investigate the explosion physics of supernovae, since the
distribution and the amount of radioactive isotopes are strongly dependent on
properties of the explosion. In this paper, expected features of these high
energy emissions are presented for bipolar jet-induced explosion models, which
are recently favored for very energetic supernovae and even for typical Type
Ib/c supernovae. It is shown that combination of various observations, i.e.,
line-to-continuum ratio, photoelectric absorption cut-off energy, line profiles
and luminosities, allows the unique determination of the explosion energy, the
amount of radioactive 56Ni, the explosion geometry, and even the viewing
orientation.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:06:52 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Maeda",
"Keiichi",
""
]
] |
0708.0973 | Guang-Yu Guo | J. C. Tung and G. Y. Guo | Systematic {\it ab initio} study of the magnetic and electronic
properties of all 3d transition metal linear and zigzag nanowires | null | Phys. Rev. B 76, 094413 (2007) | 10.1103/PhysRevB.76.094413 | null | cond-mat.mtrl-sci | null | It is found that all the zigzag chains except the nonmagnetic (NM) Ni and
antiferromagnetic (AF) Fe chains which form a twisted two-legger ladder, look
like a corner-sharing triangle ribbon, and have a lower total energy than the
corresponding linear chains. All the 3d transition metals in both linear and
zigzag structures have a stable or metastable ferromagnetic (FM) state. The
electronic spin-polarization at the Fermi level in the FM Sc, V, Mn, Fe, Co and
Ni linear chains is close to 90% or above. In the zigzag structure, the AF
state is more stable than the FM state only in the Cr chain. It is found that
the shape anisotropy energy may be comparable to the electronic one and always
prefers the axial magnetization in both the linear and zigzag structures. In
the zigzag chains, there is also a pronounced shape anisotropy in the plane
perpendicular to the chain axis. Remarkably, the axial magnetic anisotropy in
the FM Ni linear chain is gigantic, being ~12 meV/atom. Interestingly, there is
a spin-reorientation transition in the FM Fe and Co linear chains when the
chains are compressed or elongated. Large orbital magnetic moment is found in
the FM Fe, Co and Ni linear chains.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:09:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tung",
"J. C.",
""
],
[
"Guo",
"G. Y.",
""
]
] |
0708.0974 | Arthur Cohen | Arthur Cohen, Joseph Naus | A representative sampling plan for auditing health insurance claims | Published at http://dx.doi.org/10.1214/074921707000000094 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 121-131 | 10.1214/074921707000000094 | IMS-LNMS54-LNMS5409 | stat.AP | null | A stratified sampling plan to audit health insurance claims is offered. The
stratification is by dollar amount of the claim. The plan is representative in
the sense that with high probability for each stratum, the difference in the
average dollar amount of the claim in the sample and the average dollar amount
in the population, is ``small.'' Several notions of ``small'' are presented.
The plan then yields a relatively small total sample size with the property
that the overall average dollar amount in the sample is close to the average
dollar amount in the population. Three different estimators and corresponding
lower confidence bounds for over (under) payments are studied.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:11:01 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Cohen",
"Arthur",
""
],
[
"Naus",
"Joseph",
""
]
] |
0708.0975 | Cedric Adjih | C\'edric Adjih (INRIA Rocquencourt), Song Yean Cho (INRIA
Rocquencourt), Philippe Jacquet (INRIA Rocquencourt) | Near Optimal Broadcast with Network Coding in Large Sensor Networks | Dans First International Workshop on Information Theory for Sensor
Netwoks (WITS 2007) (2007) | null | null | null | cs.NI | null | We study efficient broadcasting for wireless sensor networks, with network
coding. We address this issue for homogeneous sensor networks in the plane. Our
results are based on a simple principle (IREN/IRON), which sets the same rate
on most of the nodes (wireless links) of the network. With this rate selection,
we give a value of the maximum achievable broadcast rate of the source: our
central result is a proof of the value of the min-cut for such networks, viewed
as hypergraphs. Our metric for efficiency is the number of transmissions
necessary to transmit one packet from the source to every destination: we show
that IREN/IRON achieves near optimality for large networks; that is,
asymptotically, nearly every transmission brings new information from the
source to the receiver. As a consequence, network coding asymptotically
outperforms any scheme that does not use network coding.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:13:17 GMT"
}
] | 2009-04-16T00:00:00 | [
[
"Adjih",
"Cédric",
"",
"INRIA Rocquencourt"
],
[
"Cho",
"Song Yean",
"",
"INRIA\n Rocquencourt"
],
[
"Jacquet",
"Philippe",
"",
"INRIA Rocquencourt"
]
] |
0708.0976 | Minge Xie | Kesar Singh, Minge Xie, William E. Strawderman | Confidence distribution (CD) -- distribution estimator of a parameter | Published at http://dx.doi.org/10.1214/074921707000000102 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 132-150 | 10.1214/074921707000000102 | IMS-LNMS54-LNMS5410 | math.ST stat.TH | null | The notion of confidence distribution (CD), an entirely frequentist concept,
is in essence a Neymanian interpretation of Fisher's Fiducial distribution. It
contains information related to every kind of frequentist inference. In this
article, a CD is viewed as a distribution estimator of a parameter. This leads
naturally to consideration of the information contained in CD, comparison of
CDs and optimal CDs, and connection of the CD concept to the (profile)
likelihood function. A formal development of a multiparameter CD is also
presented.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:22:21 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Singh",
"Kesar",
""
],
[
"Xie",
"Minge",
""
],
[
"Strawderman",
"William E.",
""
]
] |
0708.0977 | Valerio Lucarini | Valerio Lucarini | From symmetry break to Poisson point process in 2D Voronoi
tessellations: the generic nature of hexagons | 14 pages, 4 figures | J. Stat. Phys., 130, 1047-1062 (2008) | 10.1007/s10955-007-9475-x | null | cond-mat.stat-mech cond-mat.dis-nn cs.CG math-ph math.MP physics.data-an | null | We bridge the properties of the regular square and honeycomb Voronoi
tessellations of the plane to those of the Poisson-Voronoi case, thus analyzing
in a common framework symmetry-break processes and the approach to uniformly
random distributions of tessellation-generating points. We consider ensemble
simulations of tessellations generated by points whose regular positions are
perturbed through a Gaussian noise controlled by the parameter alpha. We study
the number of sides, the area, and the perimeter of the Voronoi cells. For
alpha>0, hexagons are the most common class of cells, and 2-parameter gamma
distributions describe well the statistics of the geometrical characteristics.
The symmetry break due to noise destroys the square tessellation, whereas the
honeycomb hexagonal tessellation is very stable and all Voronoi cells are
hexagon for small but finite noise with alpha<0.1. For a moderate amount of
Gaussian noise, memory of the specific unperturbed tessellation is lost,
because the statistics of the two perturbed tessellations is indistinguishable.
When alpha>2, results converge to those of Poisson-Voronoi tessellations. The
properties of n-sided cells change with alpha until the Poisson-Voronoi limit
is reached for alpha>2. The Desch law for perimeters is confirmed to be not
valid and a square root dependence on n is established. The ensemble mean of
the cells area and perimeter restricted to the hexagonal cells coincides with
the full ensemble mean; this might imply that the number of sides acts as a
thermodynamic state variable fluctuating about n=6; this reinforces the idea
that hexagons, beyond their ubiquitous numerical prominence, can be taken as
generic polygons in 2D Voronoi tessellations.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:23:31 GMT"
}
] | 2011-10-11T00:00:00 | [
[
"Lucarini",
"Valerio",
""
]
] |
0708.0978 | Cun-Hui Zhang | Weihua Tang, Cun-Hui Zhang | Empirical Bayes methods for controlling the false discovery rate with
dependent data | Published at http://dx.doi.org/10.1214/074921707000000111 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 151-160 | 10.1214/074921707000000111 | IMS-LNMS54-LNMS5411 | stat.ME | null | False discovery rate (FDR) has been widely used as an error measure in large
scale multiple testing problems, but most research in the area has been focused
on procedures for controlling the FDR based on independent test statistics or
the properties of such procedures for test statistics with certain types of
stochastic dependence. Based on an approach proposed in Tang and Zhang (2005),
we further develop in this paper empirical Bayes methods for controlling the
FDR with dependent data. We implement our methodology in a time series model
and report the results of a simulation study to demonstrate the advantages of
the empirical Bayes approach.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:32:21 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Tang",
"Weihua",
""
],
[
"Zhang",
"Cun-Hui",
""
]
] |
0708.0979 | Steffen Weissmann | Ulrich Pinkall, Boris Springborn, Steffen Weissmann | A new doubly discrete analogue of smoke ring flow and the real time
simulation of fluid flow | 15 pages, 3 figures | J. Phys. A: Math. Theor. 40 (2007) 12563-12576 | 10.1088/1751-8113/40/42/S04 | null | nlin.SI math.DS physics.flu-dyn | null | Modelling incompressible ideal fluids as a finite collection of vortex
filaments is important in physics (super-fluidity, models for the onset of
turbulence) as well as for numerical algorithms used in computer graphics for
the real time simulation of smoke. Here we introduce a time-discrete evolution
equation for arbitrary closed polygons in 3-space that is a discretisation of
the localised induction approximation of filament motion. This discretisation
shares with its continuum limit the property that it is a completely integrable
system. We apply this polygon evolution to a significant improvement of the
numerical algorithms used in Computer Graphics.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:37:25 GMT"
}
] | 2007-10-10T00:00:00 | [
[
"Pinkall",
"Ulrich",
""
],
[
"Springborn",
"Boris",
""
],
[
"Weissmann",
"Steffen",
""
]
] |
0708.0980 | Yosef Rinott | Yosef Rinott, Natalie Shlomo | A smoothing model for sample disclosure risk estimation | Published at http://dx.doi.org/10.1214/074921707000000120 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 161-171 | 10.1214/074921707000000120 | IMS-LNMS54-LNMS5412 | stat.ME | null | When a sample frequency table is published, disclosure risk arises when some
individuals can be identified on the basis of their values in certain
attributes in the table called key variables, and then their values in other
attributes may be inferred, and their privacy is violated. On the basis of the
sample to be released, and possibly some partial knowledge of the whole
population, an agency which considers releasing the sample, has to estimate the
disclosure risk. Risk arises from non-empty sample cells which represent small
population cells and from population uniques in particular. Therefore risk
estimation requires assessing how many of the relevant population cells are
likely to be small. Various methods have been proposed for this task, and we
present a method in which estimation of a population cell frequency is based on
smoothing using a local neighborhood of this cell, that is, cells having
similar or close values in all attributes. We provide some preliminary results
and experiments with this method. Comparisons are made to two other methods: 1.
a log-linear models approach in which inference on a given cell is based on a
``neighborhood'' of cells determined by the log-linear model. Such
neighborhoods have one or some common attributes with the cell in question, but
some other attributes may differ significantly. 2 The Argus method in which
inference on a given cell is based only on the sample frequency in the specific
cell, on the sample design and on some known marginal distributions of the
population, without learning from any type of ``neighborhood'' of the given
cell, nor from any model which uses the structure of the table.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:40:51 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Rinott",
"Yosef",
""
],
[
"Shlomo",
"Natalie",
""
]
] |
0708.0981 | Arthur Cohen | Arthur Cohen, Harold Sackrowitz | A note on the U,V method of estimation | Published at http://dx.doi.org/10.1214/074921707000000139 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 172-176 | 10.1214/074921707000000139 | IMS-LNMS54-LNMS5413 | math.ST stat.TH | null | The U,V method of estimation provides unbiased estimators or predictors of
random quantities. The method was introduced by Robbins \citer3 and
subsequently studied in a series of papers by Robbins and Zhang. (See Zhang
\citer5.) Practical applications of the method are featured in these papers. We
demonstrate that for one U function (one for which there is an important
application) the V estimator is inadmissible for a wide class of loss
functions. For another important U function the V estimator is admissible for
the squared error loss function.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:47:51 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Cohen",
"Arthur",
""
],
[
"Sackrowitz",
"Harold",
""
]
] |
0708.0982 | James Geach | J. E. Geach (Durham), C. Simpson (Liverpool JM), S. Rawlings (Oxford),
A. M. Read (Leicester), M. Watson (Leicester) | Low-power radio galaxy environments in the Subaru/XMM-Newton Deep Field
at z~0.5 | 12 pages, 7 figures, accepted for publication in MNRAS. High
resolution version available upon request | null | 10.1111/j.1365-2966.2007.12329.x | null | astro-ph | null | We present multi-object spectroscopy of galaxies in the immediate (Mpc-scale)
environments of four low-power (L_1.4 GHz < 10^25 W/Hz) radio galaxies at
z~0.5, selected from the Subaru/XMM-Newton Deep Field. We use the spectra to
calculate velocity dispersions and central redshifts of the groups the radio
galaxies inhabit, and combined with XMM-Newton (0.3-10 keV) X-ray observations
investigate the L_X--sigma_v and T_X--sigma_v scaling relationships. All the
radio galaxies reside in moderately rich groups -- intermediate environments
between poor groups and rich clusters, with remarkably similar X-ray
properties. We concentrate our discussion on our best statistical example that
we interpret as a low-power (FRI) source triggered within a sub-group, which in
turn is interacting with a nearby group of galaxies, containing the bulk of the
X-ray emission for the system -- a basic scenario which can be compared to more
powerful radio sources at both high (z>4) and low (z<0.1) redshifts. This
suggests that galaxy-galaxy interactions triggered by group mergers may play an
important role in the life-cycle of radio galaxies at all epochs and
luminosities.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:53:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Geach",
"J. E.",
"",
"Durham"
],
[
"Simpson",
"C.",
"",
"Liverpool JM"
],
[
"Rawlings",
"S.",
"",
"Oxford"
],
[
"Read",
"A. M.",
"",
"Leicester"
],
[
"Watson",
"M.",
"",
"Leicester"
]
] |
0708.0983 | Peter J. Bickel | Peter J. Bickel, Bo Li | Local polynomial regression on unknown manifolds | Published at http://dx.doi.org/10.1214/074921707000000148 in the IMS
Lecture Notes Monograph Series
(http://www.imstat.org/publications/lecnotes.htm) by the Institute of
Mathematical Statistics (http://www.imstat.org) | IMS Lecture Notes Monograph Series 2007, Vol. 54, 177-186 | 10.1214/074921707000000148 | IMS-LNMS54-LNMS5414 | math.ST stat.TH | null | We reveal the phenomenon that ``naive'' multivariate local polynomial
regression can adapt to local smooth lower dimensional structure in the sense
that it achieves the optimal convergence rate for nonparametric estimation of
regression functions belonging to a Sobolev space when the predictor variables
live on or close to a lower dimensional manifold.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 15:58:50 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Bickel",
"Peter J.",
""
],
[
"Li",
"Bo",
""
]
] |
0708.0984 | Olga Lakhina | O. Lakhina, P. Bicudo | Microscopic quark study of the eta and eta' masses | 10 pages, 18 figures | null | null | null | hep-ph | null | We show that it is necessary to go beyond the BCS (rainbow-ladder)
approximation to split the $\eta$ and $\eta'$ masses from the $\pi$ and K
masses. We determine the self-consistent set of one-quark-loop diagrams both
for the Schwinger-Dyson quark mass gap equation and for the Bethe-Salpeter
quark-antiquark boundstate equation. We identify the dominant diagrams, and we
focus on the boundstate equation. We detail the Bethe-Salpeter equation, adding
the dominant new diagram to the BCS kernel. The relevant numerical techniques
are also discussed. The ideal cases of one, two and three light flavors,
relevant to lattice QCD are also explored, together with the case of realistic
current quark masses.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 16:26:39 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Lakhina",
"O.",
""
],
[
"Bicudo",
"P.",
""
]
] |
0708.0985 | D. V. Osipov | Herbert Kurke, Denis Osipov, Alexander Zheglov | Formal punctured ribbons and two-dimensional local fields | 38 pages, minor changes | Journal fuer die reine und angewandte Mathematik. Vol. 2009, Issue
629, pp. 133 - 170 | 10.1515/CRELLE.2009.029 | null | math.AG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate formal ribbons on curves. Roughly speaking, formal ribbon is a
family of locally linearly compact vector spaces on a curve. We establish a
one-to-one correspondence between formal ribbons on curves plus some geometric
data and some subspaces of two-dimensional local field.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 19:08:50 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 06:54:31 GMT"
},
{
"version": "v3",
"created": "Wed, 6 Feb 2008 14:27:26 GMT"
},
{
"version": "v4",
"created": "Tue, 25 Jan 2011 15:05:55 GMT"
}
] | 2023-08-21T00:00:00 | [
[
"Kurke",
"Herbert",
""
],
[
"Osipov",
"Denis",
""
],
[
"Zheglov",
"Alexander",
""
]
] |
0708.0986 | Dr Michael R. Goad | M.R. Goad (1), L.G. Tyler (1), A.P. Beardmore (1), P.A. Evans (1),
S.R. Rosen (1), J.P. Osborne (1), R.L.C. Starling (1), F.E. Marshall (2), V.
Yershov (3), D.N. Burrows (4), N. Gehrels (2), P. Roming (4), A. Moretti (5),
M. Capalbi (6), J.E. Hill (7), J. Kennea (4), S. Koch (4), D. Vanden Berk (4)
((1) University of Leicester, (2) Goddard Space Flight Center, (3) Mullard
Space Science Laboratory, (4) Pennsylvania State University, (5) INAF -
Osservatorio Astronomica de Brera, (6) ASI Science Data Center, (7)
Universities Space Research Association) | Accurate early positions for Swift GRBS: enhancing X-ray positions with
UVOT astrometry | 12 pages, 8 figures, 1 table, submitted to Astronomy and
Astrophysics, August 7th 2007 | null | 10.1051/0004-6361:20078436 | null | astro-ph | null | Here we describe an autonomous way of producing more accurate prompt XRT
positions for Swift-detected GRBs and their afterglows, based on UVOT
astrometry and a detailed mapping between the XRT and UVOT detectors. The
latter significantly reduces the dominant systematic error -- the star-tracker
solution to the World Coordinate System. This technique, which is limited to
times when there is significant overlap between UVOT and XRT PC-mode data,
provides a factor of 2 improvement in the localisation of XRT refined positions
on timescales of less than a few hours. Furthermore, the accuracy achieved is
superior to astrometrically corrected XRT PC mode images at early times (for up
to 24 hours), for the majority of bursts, and is comparable to the accuracy
achieved by astrometrically corrected X-ray positions based on deep XRT PC-mode
imaging at later times (abridged).
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 16:48:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Goad",
"M. R.",
""
],
[
"Tyler",
"L. G.",
""
],
[
"Beardmore",
"A. P.",
""
],
[
"Evans",
"P. A.",
""
],
[
"Rosen",
"S. R.",
""
],
[
"Osborne",
"J. P.",
""
],
[
"Starling",
"R. L. C.",
""
],
[
"Marshall",
"F. E.",
""
],
[
"Yershov",
"V.",
""
],
[
"Burrows",
"D. N.",
""
],
[
"Gehrels",
"N.",
""
],
[
"Roming",
"P.",
""
],
[
"Moretti",
"A.",
""
],
[
"Capalbi",
"M.",
""
],
[
"Hill",
"J. E.",
""
],
[
"Kennea",
"J.",
""
],
[
"Koch",
"S.",
""
],
[
"Berk",
"D. Vanden",
""
]
] |
0708.0987 | Ping Ao | P Ao | Darwinian Dynamics Implies Developmental Ascendency | 3 pages, latex | Biological Theory 2 (1) (2007) 113-115 | null | null | q-bio.PE q-bio.OT | null | A tendency in biological theorizing is to formulate principles above or equal
to Evolution by Variation and Selection of Darwin and Wallace. In this letter I
analyze one such recent proposal which did so for the developmental ascendency.
I show that though the idea of developmental ascendency is brilliant, this is
in wrong order in the hierarchical structure of biological theories and can
easily generate confusing. Several other examples are also briefly discussed in
the note added.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 16:52:40 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Ao",
"P",
""
]
] |
0708.0988 | Alfred Ziegler | Alfred Ziegler | The role of the two postulates of special relativity | submittes to "American Journal of Physics" | null | null | null | physics.ed-ph | null | Students are often mystified by the reasoning that leads from the postulates
of special relativity to the requirement of covariance. This is partly due to
the lack of transparency resulting from the failure to clearly separate the
roles the postulates of the constancy of the speed of light and of relativity
play. Their roles are elucidated here by mainly geometric means. Finally some
standard derivations found in textbooks are analyzed in order to sort out the
basic physical ingredients.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 16:53:24 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Ziegler",
"Alfred",
""
]
] |
0708.0989 | Christoph Luhn | Herbi K. Dreiner, Christoph Luhn, Hitoshi Murayama, Marc Thormeier | Proton Hexality from an Anomalous Flavor U(1) and Neutrino Masses -
Linking to the String Scale | 32 pages, 8 tables, references updated, matches published version | Nucl.Phys.B795:172-200,2008 | 10.1016/j.nuclphysb.2007.11.014 | UFIFT-HEP-07-11 | hep-ph hep-th | null | We devise minimalistic gauged U(1)_X Froggatt-Nielsen models which at
low-energy give rise to the recently suggested discrete gauge Z_6 symmetry,
proton hexality, thus stabilizing the proton. Assuming three generations of
right-handed neutrinos, with the proper choice of X-charges, we obtain viable
neutrino masses. Furthermore, we find scenarios such that no X-charged hidden
sector superfields are needed, which from a bottom-up perspective allows the
calculation of g_string, g_X and G_SM's Kac-Moody levels. The only mass scale
apart from M_grav is m_soft.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:09:44 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Dec 2007 03:34:32 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dreiner",
"Herbi K.",
""
],
[
"Luhn",
"Christoph",
""
],
[
"Murayama",
"Hitoshi",
""
],
[
"Thormeier",
"Marc",
""
]
] |
0708.0990 | Tristan Torrelli | Jo\"el Brian\c{c}on (JAD), Philippe Maisonobe (JAD), Tristan Torrelli
(JAD) | Matrice magique associ\'ee \`a un germe de courbe plane et division par
l'id\'eal Jacobien | Pr\'epublication math\'ematique n^o;716 du Laboratoire Jean-Alexandre
Dieudonn\'e (Univ. de Nice-Sophia Antipolis) | Annales de l'Institut Fourier 3, 57 (2007) 919 | null | null | math.AG | null | In the ring of holomorphic functions at the origin of C^2, we consider the
equation uf'_x+vf'_y=wf where f and w are given. We introduce intersection
multiplicities relative to w and f'_y along the branches of f, and we study the
solutions (u,v) using these valuations. As an application, we construct an
explicit functional equation satisfied by f.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:12:53 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Briançon",
"Joël",
"",
"JAD"
],
[
"Maisonobe",
"Philippe",
"",
"JAD"
],
[
"Torrelli",
"Tristan",
"",
"JAD"
]
] |
0708.0991 | F. Javier Garcia de Abajo | F. J. Garcia de Abajo, R. Gomez-Medina, and J. J. Saenz | Full transmission through perfect-conductor subwavelength hole arrays | 5 pages, 4 figures | Physical Review E 72, 016608 (2005) | 10.1103/PhysRevE.72.016608 | null | cond-mat.other | null | Light transmission through 2D subwavelength hole arrays in perfect-conductor
films is shown to be complete (100%) at some resonant wavelengths even for
arbitrarily narrow holes. Conversely, the reflection on a 2D planar array of
non-absorbing scatterers is shown to be complete at some wavelengths regardless
how weak the scatterers are. These results are proven analytically and
corroborated by rigorous numerical solution of Maxwell's equations. This work
supports the central role played by dynamical diffraction during light
transmission through subwavelength hole arrays and it provides a systematics to
analyze more complex geometries and many of the features observed in connection
with transmission through hole arrays.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:22:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Abajo",
"F. J. Garcia",
""
],
[
"Gomez-Medina",
"R.",
""
],
[
"Saenz",
"J. J.",
""
]
] |
0708.0992 | Bin Wang | Shaoyu Yin, Bin Wang, Elcio Abdalla, Chi-Yong Lin | The transition of equation of state of effective dark energy in the DGP
model with bulk contents | 25 pages, 11 figures, revised version, accepted for publication in
Phys. Rev. D | Phys.Rev.D76:124026,2007 | 10.1103/PhysRevD.76.124026 | null | hep-th astro-ph gr-qc | null | We investigate the effect of the bulk contents in the DGP braneworld on the
evolution of the universe. We find that although the pure DGP model cannot
accommodate the transition of the effective equation of state of dark energy,
once the bulk matter T^5_5 is considered, the modified model can realize the
w_{eff} crossing -1. However this transition of the equation of state cannot be
realized by just considering bulk-brane energy exchange or the GB effect while
the bulk matter contribution is not included. T^5_5 plays the major role in the
modified DGP model to have the w crossing -1 behavior. We show that our model
can describe the super-acceleration of our universe with the equation of state
of the effective dark energy and the Hubble parameter in agreement with
observations.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:34:39 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 12:52:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yin",
"Shaoyu",
""
],
[
"Wang",
"Bin",
""
],
[
"Abdalla",
"Elcio",
""
],
[
"Lin",
"Chi-Yong",
""
]
] |
0708.0993 | Timothy Clifton | Timothy Clifton and Joel M. Weisberg | A Simple Model for Pulse Profiles from Precessing Pulsars, with Special
Application to Relativistic Binary PSR B1913+16 | 35 pages and 8 figures. Published version | Astrophys.J.679:687-696,2008; AIP Conf.Proc.983:163-165,2008 | 10.1086/587049 10.1063/1.2900136 | null | astro-ph gr-qc | null | We study the observable pulse profiles that can be generated from precessing
pulsars. A novel coordinate system is defined to aid visualization of the
observing geometry. Using this system we explore the different families of
profiles that can be generated by simple, circularly symmetric beam shapes. An
attempt is then made to fit our model to the observations of relativistic
binary PSR B1913+16. It is found that while qualitatively similar pulse
profiles can be produced, this minimal model is insufficient for an accurate
match to the observational data. Consequently, we confirm that the emission
beam of PSR B1913+16 must deviate from circular symmetry, as first reported by
Weisberg and Taylor. However, the approximate fits obtained suggest that it may
be sufficient to consider only minimal deviations from a circular beam in order
to explain the data. We also comment on the applicability of our analysis
technique to other precessing pulsars, both binary and isolated.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:38:53 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Apr 2008 10:27:48 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Clifton",
"Timothy",
""
],
[
"Weisberg",
"Joel M.",
""
]
] |
0708.0994 | F. Javier Garcia de Abajo | F. J. Garcia de Abajo, G. Gomez-Santos, L. A. Blanco, A. G. Borisov,
and S. V. Shabanov | Tunneling mechanism of light transmission through metallic films | 4 papges, 5 figures | Physical Review Letters 95, 067403 (2005) | 10.1103/PhysRevLett.95.067403 | null | cond-mat.other | null | A mechanism of light transmission through metallic films is proposed,
assisted by tunnelling between resonating buried dielectric inclusions. This is
illustrated by arrays of Si spheres embedded in Ag. Strong transmission peaks
are observed near the Mie resonances of the spheres. The interaction among
various planes of spheres and interference effects between these resonances and
the surface plasmons of Ag lead to mixing and splitting of the resonances.
Transmission is proved to be limited only by absorption. For small spheres, the
effective dielectric constant can be tuned to values close to unity and a
method is proposed to turn the resulting materials invisible.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:42:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Abajo",
"F. J. Garcia",
""
],
[
"Gomez-Santos",
"G.",
""
],
[
"Blanco",
"L. A.",
""
],
[
"Borisov",
"A. G.",
""
],
[
"Shabanov",
"S. V.",
""
]
] |
0708.0995 | Franz Gross | Franz Gross, G. Ramalho, and M.T. Pena | Fixed-axis polarization states: covariance and comparisons | Changed title and introductory material to match accepted paper | null | 10.1103/PhysRevC.77.035203 | JLAB-THY-07-700 | nucl-th | null | Addressing the recent criticisms of Kvinikhidze and Miller, we prove that the
spectator wave functions and currents based on ``fixed-axis'' polarization
states (previously introduced by us) are Lorentz covariant, and find an
explicit connection between them and conventional direction-dependent
polarization states. The discussion shows explicitly how it is possible to
construct pure $S$-wave models of the nucleon.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:35:00 GMT"
},
{
"version": "v2",
"created": "Tue, 18 Mar 2008 14:17:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gross",
"Franz",
""
],
[
"Ramalho",
"G.",
""
],
[
"Pena",
"M. T.",
""
]
] |
0708.0996 | Richard Forbes | Jonathan H. B. Deane, Richard G. Forbes and R. W. Shail | Formal derivation of an exact series expansion for the Principal Field
Emission Elliptic Function v | 10 pages when typeset | null | null | null | math-ph math.MP | null | An exact series expansion is now known for the Principal Field Emission
Elliptic Function v, in terms of a complementary elliptic variable l' equal to
y*y, where y is the Nordheim parameter. This expansion was originally found by
using the algebraic manipulation package MAPLE. This paper presents a formal
mathematical derivation. It has been discovered that v(l') is a particular
solution of the ordinary differential equation (ODE) l'(1-l')d^2v/dl'^2=nv,
when the index n = 3/16. This ODE appears to be new in mathematical physics and
elliptic-function theory. The paper first uses an 1876 result from Cayley to
establish the boundary condition that dv/dl' satisfies as l' tends to zero. It
then uses the method of Frobenius to obtain two linearly independent series
solutions for the ODE, and hence derives the series expansion for v(l'). It is
shown that terms in ln{l'} are required in a mathematically correct solution,
but fractional powers of l' are not. The form of the ODE also implies that it
is mathematically impossible for simple Taylor expansion methods to generate
good approximation formulae valid over the whole range 0 =< l' =< 1; this
conclusion may also apply to barriers of other shapes. It is hoped that this
derivation might serve as a paradigm for the treatment of other tunnelling
barrier models for cold field electron emission, if in any particular case an
ODE can be found for which the tunnelling-exponent correction function is a
particular solution.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:31:06 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 01:10:05 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Deane",
"Jonathan H. B.",
""
],
[
"Forbes",
"Richard G.",
""
],
[
"Shail",
"R. W.",
""
]
] |
0708.0997 | Wayne M. Saslow | Wayne M. Saslow | Spin Pumping of Current in Non-Uniform Conducting Magnets | 13 pages in pdf format; 1 figure | null | 10.1103/PhysRevB.76.184434 | null | cond-mat.other | null | Using irreversible thermodynamics we show that current-induced spin transfer
torque within a magnetic domain implies spin pumping of current within that
domain. This has experimental implications for samples both with conducting
leads and that are electrically isolated. These results are obtained by
deriving the dynamical equations for two models of non-uniform conducting
magnets: (1) a generic conducting magnet, with net conduction electron density
n and net magnetization $\vec{M}$; and (2) a two-band magnet, with up and down
spins each providing conduction and magnetism. For both models, in regions
where the equilibrium magnetization is non-uniform, voltage gradients can drive
adiabatic and non-adiabatic bulk spin torques. Onsager relations then ensure
that magnetic torques likewise drive adiabatic and non-adiabatic currents --
what we call bulk spin pumping. For a given amount of adiabatic and
non-adiabatic spin torque, the two models yield similar but distinct results
for the bulk spin pumping, thus distinguishing the two models. As in the recent
spin-Berry phase study by Barnes and Maekawa, we find that within a domain wall
the ratio of the effective emf to the magnetic field is approximately given by
$P(2\mu_{B}/e)$, where P is the spin polarization. The adiabatic spin torque
and spin pumping terms are shown to be dissipative in nature.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:45:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Saslow",
"Wayne M.",
""
]
] |
0708.0998 | Jan Ob{\l}\'oj | Jan Obloj | Fine-tune your smile: Correction to Hagan et al | Typos and reference corrected. Eq (3) valid for all x now | null | null | null | q-fin.CP math.PR q-fin.ST | null | In this small note we use results derived in Berestycki et al. to correct the
celebrated formulae of Hagan et al. We derive explicitly the correct zero order
term in the expansion of the implied volatility in time to maturity. The new
term is consistent as $\beta\to 1$. Furthermore, numerical simulations show
that it reduces or eliminates known pathologies of the earlier formula.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 17:50:32 GMT"
},
{
"version": "v2",
"created": "Thu, 13 Sep 2007 16:57:19 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Mar 2008 15:25:33 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Obloj",
"Jan",
""
]
] |
0708.0999 | F. Javier Garcia de Abajo | S. Riikonen, I. Romero, and F. J. Garcia de Abajo | Plasmon tunability in metallodielectric metamaterials | 6 pages, 4 figures | Physical Review B 71, 235104 (2005) | 10.1103/PhysRevB.71.235104 | null | cond-mat.mtrl-sci | null | The dielectric properties of metamaterials consisting of periodically
arranged metallic nanoparticles of spherical shape are calculated by rigorously
solving Maxwell's equations. Effective dielectric functions are obtained by
comparing the reflectivity of planar surfaces limiting these materials with
Fresnel's formulas for equivalent homogeneous media, showing mixing and
splitting of individual-particle modes due to inter-particle interaction.
Detailed results for simple cubic and fcc crystals of aluminum spheres in
vacuum, silver spheres in vacuum, and silver spheres in a silicon matrix are
presented. The filling fraction of the metal f is shown to determine the
position of the plasmon modes of these metamaterials. Significant deviations
are observed with respect to Maxwell-Garnett effective medium theory for large
f, and multiple plasmons are predicted to exist in contrast to Maxwell-Garnett
theory.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:07:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Riikonen",
"S.",
""
],
[
"Romero",
"I.",
""
],
[
"de Abajo",
"F. J. Garcia",
""
]
] |
0708.1000 | Seiji Zenitani | S. Zenitani, M. Hoshino | Particle Acceleration and Magnetic Dissipation in Relativistic Current
Sheet of Pair Plasmas | To appear in ApJ vol. 670; 60 pages, 27 figures; References and typos
are fixed | Astrophys. J. 670 (2007) 702-726 | 10.1086/522226 | null | astro-ph | null | We study linear and nonlinear development of relativistic and
ultrarelativistic current sheets of pair plasmas with antiparallel magnetic
fields. Two types of two-dimensional problems are investigated by
particle-in-cell simulations. First, we present the development of relativistic
magnetic reconnection, whose outflow speed is an order of the light speed c. It
is demonstrated that particles are strongly accelerated in and around the
reconnection region, and that most of magnetic energy is converted into
"nonthermal" part of plasma kinetic energy. Second, we present another
two-dimensional problem of a current sheet in a cross-field plane. In this
case, the relativistic drift kink instability (RDKI) occurs. Particle
acceleration also takes place, but the RDKI fast dissipates the magnetic energy
into plasma heat. We discuss the mechanism of particle acceleration and the
theory of the RDKI in detail. It is important that properties of these two
processes are similar in the relativistic regime of T > mc^2, as long as we
consider the kinetics. Comparison of the two processes indicates that magnetic
dissipation by the RDKI is more favorable process in the relativistic current
sheet. Therefore the striped pulsar wind scenario should be reconsidered by the
RDKI.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:21:52 GMT"
},
{
"version": "v2",
"created": "Thu, 11 Oct 2007 17:39:18 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Zenitani",
"S.",
""
],
[
"Hoshino",
"M.",
""
]
] |
0708.1001 | Per Kraus | Per Kraus, Finn Larsen, and Akhil Shah | Fundamental Strings, Holography, and Nonlinear Superconformal Algebras | 25 pages | JHEP 0711:028,2007 | 10.1088/1126-6708/2007/11/028 | null | hep-th | null | We discuss aspects of holography in the AdS_3 \times S^p near string geometry
of a collection of straight fundamental heterotic strings. We use anomalies and
symmetries to determine general features of the dual CFT. The symmetries
suggest the appearance of nonlinear superconformal algebras, and we show how
these arise in the framework of holographic renormalization methods. The
nonlinear algebras imply intricate formulas for the central charge, and we show
that in the bulk these correspond to an infinite series of quantum gravity
corrections. We also makes some comments on the worldsheet sigma-model for
strings on AdS_3\times S^2, which is the holographic dual geometry of parallel
heterotic strings in five dimensions.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:19:08 GMT"
}
] | 2009-04-03T00:00:00 | [
[
"Kraus",
"Per",
""
],
[
"Larsen",
"Finn",
""
],
[
"Shah",
"Akhil",
""
]
] |
0708.1002 | J. R. S. Nascimento | A. F. Ferrari, M. Gomes, J. R. Nascimento, A. Yu. Petrov, A. J. da
Silva, E. O. Silva | On the finiteness of the noncommutative supersymmetric
Maxwell-Chern-Simons theory | 9 pages, 2 figures, revtex4 | Phys.Rev.D77:025002,2008 | 10.1103/PhysRevD.77.025002 | null | hep-th | null | Within the superfield approach, we prove the absence of UV/IR mixing in the
three-dimensional noncommutative supersymmetric Maxwell-Chern-Simons theory at
any loop order and demonstrate its finiteness in one, three and higher loop
orders.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:25:35 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Ferrari",
"A. F.",
""
],
[
"Gomes",
"M.",
""
],
[
"Nascimento",
"J. R.",
""
],
[
"Petrov",
"A. Yu.",
""
],
[
"da Silva",
"A. J.",
""
],
[
"Silva",
"E. O.",
""
]
] |
0708.1003 | Andrei Sergeev | A. Sergeev, M. Yu. Reizer, and V. Mitin | How Magnetic Field Enters Heat Current: Application to Fluctuation
Nernst Effect | this is an extended version of cond-mat/0607662 | null | null | null | cond-mat.supr-con cond-mat.str-el | null | A problem of the definition of the heat transported in thermomagnetic
phenomena has been well realized in the late sixties, but not solved up to
date. Ignoring this problem, numerous recent theories grossly overestimate the
thermomagnetic coefficients in strongly interacting systems. Here we develop a
gauge-invariant microscopic approach, which shows that the heat transfer should
include the energy of the interaction between electrons and a magnetic field.
We also demonstrate that the surface currents induced by the magnetic field
transfer the charge in the Nernst effect, but do not transfer the heat in the
Ettingshausen effect. Only with these two modifications of the theory, the
physically measurable thermomagnetic coefficients satisfy the Onsager relation.
We critically revised the Gaussian fluctuation model above the superconducting
transition and show that the gauge invariance uniquely relates thermomagnetic
phenomena in the Fermi liquid with the particle-hole asymmetry.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:27:18 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Sergeev",
"A.",
""
],
[
"Reizer",
"M. Yu.",
""
],
[
"Mitin",
"V.",
""
]
] |
0708.1004 | Eric Huff | Eric Huff and Steven Stahler | Cluster Formation in Contracting Molecular Clouds | To appear in ApJ Vol. 667, September 20 | null | 10.1086/520574 | null | astro-ph | null | We explore, through a simplified, semi-analytic model, the formation of dense
clusters containing massive stars. The parent cloud spawning the cluster is
represented as an isothermal sphere. This sphere is in near force balance
between self-gravity and turbulent pressure. Self-gravity, mediated by
turbulent dissipation, drives slow contraction of the cloud, eventually leading
to a sharp central spike in density and the onset of dynamical instability. We
suggest that, in a real cloud, this transition marks the late and rapid
production of massive stars.
We also offer an empirical prescription, akin to the Schmidt law, for
low-mass star formation in our contracting cloud. Applying this prescription to
the Orion Nebula Cluster, we are able to reproduce the accelerating star
formation previously inferred from the distribution of member stars in the HR
diagram. The cloud turns about 10 percent of its mass into low-mass stars
before becoming dynamically unstable. Over a cloud free-fall time, this figure
drops to 1 percent, consistent with the overall star formation efficiency of
molecular clouds in the Galaxy.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:51:05 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Huff",
"Eric",
""
],
[
"Stahler",
"Steven",
""
]
] |
0708.1005 | Yadin Y. Goldschmidt | Yadin Y. Goldschmidt and Jin-Tao Liu | Langevin Dynamics of the vortex matter two-stage melting transition in
Bi_2Sr_2CaCu_2O$_{8+\delta}$ in the presence of straight and of tilted
columnar defects | 13 pages, 11 figures | null | 10.1103/PhysRevB.76.174508 | null | cond-mat.supr-con cond-mat.dis-nn | null | In this paper we use London Langevin molecular dynamics simulations to
investigate the vortex matter melting transition in the highly anisotropic
high-temperature superconductor material Bi_2Sr_2CaCu_2O$_{8+\delta}$ in the
presence of low concentration of columnar defects (CDs). We reproduce with
further details our previous results obtained by using Multilevel Monte Carlo
simulations that showed that the melting of the nanocrystalline vortex matter
occurs in two stages: a first stage melting into nanoliquid vortex matter and a
second stage delocalization transition into a homogeneous liquid. Furthermore,
we report on new dynamical measurements in the presence of a current that
identifies clearly the irreversibility line and the second stage delocalization
transition. In addition to CDs aligned along the c-axis we also simulate the
case of tilted CDs which are aligned at an angle with respect to the applied
magnetic field. Results for CDs tilted by $45^{\circ}$ with respect to c-axis
show that the locations of the melting and delocalization transitions are not
affected by the tilt when the ratio of flux lines to CDs remains constant. On
the other hand we argue that some dynamical properties and in particular the
position of the irreversibility line should be affected.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:35:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Goldschmidt",
"Yadin Y.",
""
],
[
"Liu",
"Jin-Tao",
""
]
] |
0708.1006 | F. Javier Garcia de Abajo | F. J. Garcia de Abajo | Electromagnetic forces and torques in nanoparticles irradiated by a
plane wave | 5 papges, 2 figures | Journal of Quantitative Spectroscopy and Radiative Transfer 89,
3-9 (2004) | 10.1016/j.jqsrt.2004.05.006 | null | cond-mat.other | null | Optical tweezers and optical lattices are making it possible to control small
particles by means of electromagnetic forces and torques. In this context, a
method is presented in this work to calculate electromagnetic forces and
torques for arbitrarily-shaped objects in the presence of other objects
illuminated by a plane wave. The method is based upon an expansion of the
electromagnetic field in terms of multipoles around each object, which are in
turn used to derive forces and torques analytically. The calculation of
multipole coefficients are obtained numerically by means of the boundary
element method. Results are presented for both spherical and non-spherical
objects.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:45:32 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Abajo",
"F. J. Garcia",
""
]
] |
0708.1007 | Alex Rimberg | W. W. Xue, Z. Ji, B. Davis, Feng Pan, J. Stettenheim, T. J. Gilheart,
and A. J. Rimberg | On-Chip Matching Networks for Radio-Frequency
Single-Electron-Transistors | 3 pages, 3 figures, REVTeX 4. To appear in Appl. Phys. Lett | null | 10.1063/1.2776888 | null | cond-mat.mes-hall | null | In this letter, we describe operation of a radio-frequency superconducting
single electron transistor (RF-SSET) with an on-chip superconducting LC
matching network consisting of a spiral inductor L and its capacitance to
ground. The superconducting network has a lower parasitic capacitance and gives
a better matching for the RF-SSET than does a commercial chip inductor.
Moreover, the superconducting network has negligibly low dissipation, leading
to sensitive response to changes in the RF-SSET impedance. The charge
sensitivity 2.4*10^-6 e/(Hz)^1/2 in the sub-gap region and energy sensitivity
of 1.9 hbar indicate that the RF-SSET is operating in the vicinity of the shot
noise limit.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:59:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Xue",
"W. W.",
""
],
[
"Ji",
"Z.",
""
],
[
"Davis",
"B.",
""
],
[
"Pan",
"Feng",
""
],
[
"Stettenheim",
"J.",
""
],
[
"Gilheart",
"T. J.",
""
],
[
"Rimberg",
"A. J.",
""
]
] |
0708.1008 | Joseph D. Rudmin | Joseph Daniel Rudmin | An Isotropic Metric | 3 pages, already published in a small refereed journal: The Virginia
Journal of Science. Posted here with permission of that journal. Please refer
to http://www.vacadsci.org/vjsArchives/v58/58-1/titlepage.html | Virginia Journal of Science, Vol 58, No. 1 (Spring 2007) p.27 | null | null | physics.gen-ph | null | An isotropic metric for a black hole and a better vacuum condition \nabla^2
V_G =0 are presented which yield distinct terms for the energy densities of
ordinary matter and gravitational fields in the Einstein tensor (G^44 =-g^2
(2\nabla^2 V_G +(\nabla V_G)^2)) This model resolves an inconsistency between
electromagnetism and gravity in the calculation of field energy. Resolution of
this inconsistency suggests a slight modification of the Einstein equation to
gG^\mu\nu = 8\pi G T^\mu\nu.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:47:17 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Rudmin",
"Joseph Daniel",
""
]
] |
0708.1009 | Alex Gomes Dias | Alex G. Dias, Edison T. Franco, Vicente Pleitez | An SU(5)$\otimes$Z_{13} Grand Unification Model | 14 pages, more typos corrected | Phys.Rev.D76:115010,2007 | 10.1103/PhysRevD.76.115010 | null | hep-ph | null | We propose an SU(5) grand unified model with an invisible axion and the
unification of the three coupling constants which is in agreement with the
values, at $M_Z$, of $\alpha$, $\alpha_s$, and $\sin^2\theta_W$. A discrete,
anomalous, $Z_{13}$ symmetry implies that the Peccei-Quinn symmetry is an
automatic symmetry of the classical Lagrangian protecting, at the same time,
the invisible axion against possible semi-classical gravity effects. Although
the unification scale is of the order of the Peccei-Quinn scale the proton is
stabilized by the fact that in this model the standard model fields form the
SU(5) multiplets completed by new exotic fields and, also, because it is
protected by the $Z_{13}$ symmetry.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 18:48:01 GMT"
},
{
"version": "v2",
"created": "Tue, 4 Sep 2007 17:56:08 GMT"
},
{
"version": "v3",
"created": "Sat, 8 Dec 2007 14:41:54 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dias",
"Alex G.",
""
],
[
"Franco",
"Edison T.",
""
],
[
"Pleitez",
"Vicente",
""
]
] |
0708.1010 | Kevin Stenson | The FOCUS Collaboration: J.M. Link, et al | Search for a pentaquark decaying to Cascade- pi- | Accepted by Physics Letters B | Phys.Lett.B661:14-21,2008 | 10.1016/j.physletb.2008.01.063 | FERMILAB-PUB-07-409 | hep-ex | null | We present a search for a pentaquark decaying strongly to $\Xi^-\pi^-$ in
$\gamma N$ collisions at a center-of-mass energy up to 25 GeV/c^2. Finding no
evidence for such a state in the mass range of 1480 MeV/c^2 to 2400 MeV/c^2, we
set limits on the yield and on the cross section times branching ratio relative
to $\Xi^*(1530)^0$.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 19:42:28 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 00:54:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"The FOCUS Collaboration",
"",
""
],
[
"Link",
"J. M.",
""
]
] |
0708.1011 | Maurice Leutenegger | M. A. Leutenegger, D. H. Cohen, S. M. Kahn, S. P. Owocki, F. B. S.
Paerels | Resonance scattering in the X-ray emission line profiles of Zeta Puppis | 3 pages, 5 figures, to appear in the workshop proceedings 'Clumping
in Hot Star Winds', eds. W.-R. Hamann, A. Feldmeier, & L. Oskinova | null | null | null | astro-ph | null | We present XMM-Newton Reflection Grating Spectrometer observations of pairs
of X-ray emission line profiles from the O star Zeta Pup that originate from
the same He-like ion. The two profiles in each pair have different shapes and
cannot both be consistently fit by models assuming the same wind parameters. We
show that the differences in profile shape can be accounted for in a model
including the effects of resonance scattering, which affects the resonance line
in the pair but not the intercombination line. This implies that resonance
scattering is also important in single resonance lines, where its effect is
difficult to distinguish from a low effective continuum optical depth in the
wind. Thus, resonance scattering may help reconcile X-ray line profile shapes
with literature mass-loss rates.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 19:26:42 GMT"
}
] | 2007-08-08T00:00:00 | [
[
"Leutenegger",
"M. A.",
""
],
[
"Cohen",
"D. H.",
""
],
[
"Kahn",
"S. M.",
""
],
[
"Owocki",
"S. P.",
""
],
[
"Paerels",
"F. B. S.",
""
]
] |
0708.1012 | Micah Ledbetter | M.P. Ledbetter, I.M. Savukov, V.M. Acosta, D. Budker, M.V. Romalis | Spin-exchange relaxation free magnetometry with Cs vapor | 8 pages, 6 figures. submitted to PRA | Phys. Rev. A 77, 033408 (2008) | 10.1103/PhysRevA.77.033408 | null | physics.atom-ph | null | We describe a Cs atomic magnetometer operating in the spin-exchange
relaxation-free (SERF) regime. With a vapor cell temperature of
$103^\circ\rm{C}$ we achieve intrinsic magnetic resonance widths $\Delta B=17
{\rm \mu G}$ corresponding to an electron spin-relaxation rate of $300 {\rm
s^{-1}}$ when the spin-exchange rate is $\Gamma_{SE}=14000 {\rm s^{-1}}$. We
also observe an interesting narrowing effect due to diffusion. Signal-to-noise
measurements yield a sensitivity of about $400\thinspace{\rm pG/\sqrt{Hz}}$.
Based on photon shot noise, we project a sensitivity of $40 {\rm
pG/\sqrt{Hz}}$. A theoretical optimization of the magnetometer indicates
sensitivities on the order of $2 {\rm pG/\sqrt{Hz}}$ should be achievable in a
$1 {\rm cm^3}$ volume. Because Cs has a higher saturated vapor pressure than
other alkali metals, SERF magnetometers using Cs atoms are particularly
attractive in applications requiring lower temperatures.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 19:30:44 GMT"
}
] | 2010-03-30T00:00:00 | [
[
"Ledbetter",
"M. P.",
""
],
[
"Savukov",
"I. M.",
""
],
[
"Acosta",
"V. M.",
""
],
[
"Budker",
"D.",
""
],
[
"Romalis",
"M. V.",
""
]
] |
0708.1013 | Fernando C. Lombardo | Fernando C. Lombardo and Paula I. Villar | Noise-induced energy excitation by a general environment | 14 pages; 7 figures. Version to appear in Phys Lett. A | null | 10.1016/j.physleta.2007.08.019 | null | quant-ph cond-mat.other hep-ph hep-th | null | We analyze the effects that general environments, namely ohmic and non-ohmic,
at zero and high temperature induce over a quantum Brownian particle. We state
that the evolution of the system can be summarized in terms of two main
environmental induced physical phenomena: decoherence and energy activation. In
this article we show that the latter is a post-decoherence phenomenon. As the
energy is an observable, the excitation process is a direct indication of the
system-environment entanglement particularly useful at zero temperature.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 19:33:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lombardo",
"Fernando C.",
""
],
[
"Villar",
"Paula I.",
""
]
] |
0708.1014 | Seoktae Koh | Seoktae Koh, Robert H. Brandenberger | Evolution of Gravitational Perturbations in Non-Commutative Inflation | 24pages, 7 figures | JCAP0711:013,2007 | 10.1088/1475-7516/2007/11/013 | null | hep-th astro-ph gr-qc hep-ph | null | We consider the non-commutative inflation model of [3] in which it is the
unconventional dispersion relation for regular radiation which drives the
accelerated expansion of space. In this model, we study the evolution of linear
cosmological perturbations through the transition between the phase of
accelerated expansion and the regular radiation-dominated phase of Standard
Cosmology, the transition which is analogous to the reheating period in scalar
field-driven models of inflation. If matter consists of only a single
non-commutative radiation fluid, then the curvature perturbations are constant
on super-Hubble scales. On the other hand, if we include additional matter
fields which oscillate during the transition period, e.g. scalar moduli fields,
then there can be parametric amplification of the amplitude of the curvature
perturbations. We demonstrate this explicitly by numerically solving the full
system of perturbation equations in the case where matter consists of both the
non-commutative radiation field and a light scalar field which undergoes
oscillations. Our model is an example where the parametric resonance of the
curvature fluctuations is driven by the oscillations not of the inflaton field,
but of the entropy mode
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 19:59:13 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Koh",
"Seoktae",
""
],
[
"Brandenberger",
"Robert H.",
""
]
] |
0708.1015 | Igor Shparlinski | William D. Banks and Igor E. Shparlinski | Prime numbers with Beatty sequences | null | null | null | null | math.NT | null | A study of certain Hamiltonian systems has lead Y. Long to conjecture the
existence of infinitely many primes of the form $p=2[\alpha n]+1$, where
$1<\alpha<2$ is a fixed irrational number. An argument of P. Ribenboim coupled
with classical results about the distribution of fractional parts of irrational
multiples of primes in an arithmetic progression immediately imply that this
conjecture holds in a much more precise asymptotic form. Motivated by this
observation, we give an asymptotic formula for the number of primes $p=q[\alpha
n+\beta]+a$ with $n\le N$, where $\alpha,\beta$ are real numbers such that
$\alpha$ is positive and irrational of finite type (which is true for almost
all $\alpha$) and $a,q$ are integers with $0\le a<q\le N^\kappa$ and
$\gcd(a,q)=1$, where $\kappa>0$ depends only on $\alpha$. We also prove a
similar result for primes $p=[\alpha n+\beta]$ such that $p\equiv a\pmod q$.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 22:42:46 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Banks",
"William D.",
""
],
[
"Shparlinski",
"Igor E.",
""
]
] |
0708.1016 | Derrick Kiley | Derrick Kiley | Rotating Black Holes on Codimension-2 Branes | 7 pages, uses revtex | Phys.Rev.D76:126002,2007 | 10.1103/PhysRevD.76.126002 | null | hep-th astro-ph gr-qc hep-ph | null | It has recently been demonstrated that certain types of non-tensional
stress-energy can live on tensional codimension-2 branes, including
gravitational shockwaves and small Schwarzschild black holes. In this note we
generalize the earlier Schwarzschild results, and construct the exact
gravitational fields of small rotating black holes on a codimension-2 brane. We
focus on the phenomenologically interesting case of a three-brane embedded in a
spacetime with two compactified extra dimensions. For a nonzero tension on the
brane, we verify that these solutions also show the ``lightning rod'' effect
found in the Schwarzschild solutions, the net effect of which is to rescale the
fundamental Planck mass. This allows for larger black hole parameters, such as
the event horizon, angular momentum, and lifetime than would be naively
expected for a tensionless brane. It is also found that a black hole with
angular momentum pointing purely along the brane directions has a smaller
horizon angular velocity than the corresponding tensionless case, while a hole
with bulk components of angular momentum has a larger angular velocity.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 23:23:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kiley",
"Derrick",
""
]
] |
0708.1017 | Dan Jane | Dan Jane, Gabriel P. Paternain | On the injectivity of the X-ray transform for Anosov thermostats | Revised version more explicitly outlines an open problem in the
introduction, and corrects a typo in the Lie brackets of page 4. An appendix
rewritten for clarity in the second revision. Final version as accepted by
DCDS-A | null | null | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Anosov thermostats on a closed surface and the X-ray transform on
functions which are up to degree two in the velocities. We show that the
subspace where the X-ray transform fails to be s-injective is finite
dimensional. Furthermore, if the surface is negatively curved and the
thermostat is pure Gaussian (i.e. no magnetic field is present), then the X-ray
transform is s-injective.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 23:00:13 GMT"
},
{
"version": "v2",
"created": "Thu, 27 Sep 2007 10:57:02 GMT"
},
{
"version": "v3",
"created": "Thu, 29 Nov 2007 13:54:12 GMT"
},
{
"version": "v4",
"created": "Thu, 19 Jun 2008 21:19:13 GMT"
}
] | 2008-06-20T00:00:00 | [
[
"Jane",
"Dan",
""
],
[
"Paternain",
"Gabriel P.",
""
]
] |
0708.1018 | Pengcheng Li | Pengcheng Li, R. L. Greene | Normal State Nernst Effect in Electron-doped Pr2-xCexCuO4:
Superconducting Fluctuations and Two-band Transport | 9 pages, 8 figures, accepted in PRB | Phys. Rev. B 76, 174512 (2007) | 10.1103/PhysRevB.76.174512 | null | cond-mat.supr-con cond-mat.str-el | null | We report a systematic study of normal state Nernst effect in the
electron-doped cuprates Pr$_{2-x}$Ce$_x$CuO$_{4-\delta}$ over a wide range of
doping (0.05$\leq x \leq$0.21) and temperature. At low temperatures, we
observed a notable vortex Nernst signal above T$_c$ in the underdoped films,
but no such normal state vortex Nernst signal is found in the overdoped region.
The superconducting fluctuations in the underdoped region are most likely
incoherent phase fluctuations as found in hole-doped cuprates. At high
temperatures, a large normal state Nernst signal is found at dopings from
slightly underdoped to highly overdoped. Combined with normal state
thermoelectric power, Hall effect and magnetoresistance measurements, the large
Nernst effect is compatible with two-band model. For the highly overdoped
films, the large Nernst effect is anomalous and not explainable with a simple
hole-like Fermi surface seen in photoemission experiments.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 02:46:31 GMT"
},
{
"version": "v2",
"created": "Wed, 10 Oct 2007 23:05:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Li",
"Pengcheng",
""
],
[
"Greene",
"R. L.",
""
]
] |
0708.1019 | Hrayr Matevosyan | Hrayr H. Matevosyan and Anthony W. Thomas | 1/Nc Expansion in QCD: Double-Line Counting Rules and the Undeservingly
Discarded U(1) Ghost | null | J.Phys.G35:115006,2008 | 10.1088/0954-3899/35/11/115006 | JLAB-THY-07-701 | hep-ph hep-th nucl-th | null | The 1/Nc expansion is one of the very few methods we have for generating a
systematic expansion of QCD at the energy scale relevant to hadron structure.
The present formulation of this theory relies on the double-line notation for
calculating the leading order of a diagram in the 1/Nc expansion, where the
local SU(Nc) gauge symmetry is substituted by a U(Nc) symmetry and the
associated U(1) ghost field is ignored. In the current work we demonstrate the
insufficiency of this formulation for describing certain non-planar diagrams.
We derive a more complete set of Feynman rules that include the U(1) ghost
field and provide a useful tool for calculating both color factors and 1/Nc
orders of all color-singlet diagrams.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 21:31:48 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Apr 2008 17:16:14 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Matevosyan",
"Hrayr H.",
""
],
[
"Thomas",
"Anthony W.",
""
]
] |
0708.1020 | Joshua Younger | Joshua D. Younger, Giovanni G. Fazio, Jia-Sheng Huang, Min S. Yun,
Grant W. Wilson, Matthew L. N. Ashby, Mark A. Gurwell, Kamson Lai, Alison B.
Peck, Glen R. Petitpas, David J. Wilner, Daisuke Iono, Kotaro Kohno, Ryohei
Kawabe, David H. Hughes, Itziar Aretxaga, Tracy Webb, Alejo
Martinez-Sansigre, Sungeun Kim, Kimberly S. Scott, Jason Austermann, Thushara
Perera, James D. Lowenthal, Eva Schinnerer, Vernesa Smolcic | Evidence for a Population of High-Redshift Submillimeter Galaxies from
Interferometric Imaging | 7 pages, 3 figures, accepted for publication in ApJ | null | 10.1086/522776 | null | astro-ph | null | We have used the Submillimeter Array to image a flux limited sample of seven
submillimeter galaxies, selected by the AzTEC camera on the JCMT at 1.1 mm, in
the COSMOS field at 890um with 2" resolution. All of the sources - two
radio-bright and five radio-dim - are detected as single point-sources at high
significance (> 6\sigma), with positions accurate to 0.2" that enable
counterpart identification at other wavelengths observed with similarly high
angular resolution. All seven have IRAC counterparts, but only two have secure
counterparts in deep HST/ACS imaging. As compared to the two radio-bright
sources in the sample, and those in previous studies, the five radio-dim
sources in the sample (1) have systematically higher submillimeter-to-radio
flux ratios, (2) have lower IRAC 3.6-8.0um fluxes, and (3) are not detected at
24um. These properties, combined with size constraints at 890um (\theta <
1.2"), suggest that the radio-dim submillimeter galaxies represent a population
of very dusty starbursts, with physical scales similar to local ultraluminous
infrared galaxies, and an average redshift higher than radio-bright sources.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 20:11:29 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Younger",
"Joshua D.",
""
],
[
"Fazio",
"Giovanni G.",
""
],
[
"Huang",
"Jia-Sheng",
""
],
[
"Yun",
"Min S.",
""
],
[
"Wilson",
"Grant W.",
""
],
[
"Ashby",
"Matthew L. N.",
""
],
[
"Gurwell",
"Mark A.",
""
],
[
"Lai",
"Kamson",
""
],
[
"Peck",
"Alison B.",
""
],
[
"Petitpas",
"Glen R.",
""
],
[
"Wilner",
"David J.",
""
],
[
"Iono",
"Daisuke",
""
],
[
"Kohno",
"Kotaro",
""
],
[
"Kawabe",
"Ryohei",
""
],
[
"Hughes",
"David H.",
""
],
[
"Aretxaga",
"Itziar",
""
],
[
"Webb",
"Tracy",
""
],
[
"Martinez-Sansigre",
"Alejo",
""
],
[
"Kim",
"Sungeun",
""
],
[
"Scott",
"Kimberly S.",
""
],
[
"Austermann",
"Jason",
""
],
[
"Perera",
"Thushara",
""
],
[
"Lowenthal",
"James D.",
""
],
[
"Schinnerer",
"Eva",
""
],
[
"Smolcic",
"Vernesa",
""
]
] |
0708.1021 | John A. Smolin | Andrew Cross, Graeme Smith, John A. Smolin and Bei Zeng | Codeword Stabilized Quantum Codes | 5 pages, 1 eps figure, ((11,48,3)) code removed, encoding circuits
added, typos corrected in codewords and elsewhere | IEEE Trans. Info. Theory 55, 1, 433-438 (2009) | 10.1109/TIT.2008.2008136 | null | quant-ph | null | We present a unifying approach to quantum error correcting code design that
encompasses additive (stabilizer) codes, as well as all known examples of
nonadditive codes with good parameters. We use this framework to generate new
codes with superior parameters to any previously known. In particular, we find
((10,18,3)) and ((10,20,3)) codes. We also show how to construct encoding
circuits for all codes within our framework.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 20:01:22 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 20:22:34 GMT"
},
{
"version": "v3",
"created": "Tue, 14 Aug 2007 20:39:07 GMT"
},
{
"version": "v4",
"created": "Thu, 27 Sep 2007 21:45:31 GMT"
}
] | 2009-02-19T00:00:00 | [
[
"Cross",
"Andrew",
""
],
[
"Smith",
"Graeme",
""
],
[
"Smolin",
"John A.",
""
],
[
"Zeng",
"Bei",
""
]
] |
0708.1022 | Jeremy Drake | Jeremy J. Drake, Barbara Ercolano | The Detectability of Neon Fluorescence and Measurement of the Solar
Photospheric Neon Abundance | To appear in Astrophysical Journal Letters. 13 pages, 3 figures, 1
table | null | 10.1086/521190 | null | astro-ph | null | Monte Carlo calculations of the Ne K$\alpha$ line fluoresced by coronal
x-rays and emitted near the temperature minimum region of the solar atmosphere
have been employed to investigate the use of this feature to measure directly
the solar photospheric Ne abundance. Though very weak, comparison with spectral
line databases indicates that at plasma temperatures typical of the quiet Sun
and cool active regions ($\leq 2\times 10^6$ K) the line is isolated and
unblended. A canonical solar chemical composition yields an equivalent width of
$\sim 6$ m\AA (0.3 eV) when observed at heliocentric angles $\sim 0$. For a 1
arcmin field of view, photon fluxes at Earth are of order 0.2 ph s$^{-1}$ for
the quiet Sun, rendering the Ne K$\alpha$ fluorescent line a quite feasible
means for determining the solar photospheric Ne content.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 20:06:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Drake",
"Jeremy J.",
""
],
[
"Ercolano",
"Barbara",
""
]
] |
0708.1023 | Keshav Dasgupta | Keshav Dasgupta, Veronique Hussin and Alisha Wissanji | Quaternionic Kahler Manifolds, Constrained Instantons and the Magic
Square: I | Harvmac, 66 pages, 9 .eps figures; v2: Three new results added around
pages 15, 50 and 51, typos corrected and references added; v3: Some more
typos corrected. Final version to appear in Nuclear Physics B | Nucl.Phys.B793:34-82,2008 | 10.1016/j.nuclphysb.2007.09.026 | null | hep-th math-ph math.MP | null | The classification of homogeneous quaternionic manifolds has been done by
Alekseevskii, Wolf et al using transitive solvable group of isometries. These
manifolds are not generically symmetric, but there is a subset of quaternionic
manifolds that are symmetric and Einstein. A further subset of these manifolds
are the magic square manifolds. We show that all the symmetric quaternionic
manifolds including the magic square can be succinctly classified by
constrained instantons. These instantons are mostly semilocal, and their
constructions for the magic square can be done from the corresponding
Seiberg-Witten curves for certain N = 2 gauge theories that are in general not
asymptotically free. Using these, we give possible constructions, such as the
classical moduli space metrics, of constrained instantons with exceptional
global symmetries. We also discuss the possibility of realising the Kahler
manifolds in the magic square using other solitonic configurations in the
theory, and point out an interesting new sequence of these manifolds in the
magic square.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 23:08:00 GMT"
},
{
"version": "v2",
"created": "Wed, 22 Aug 2007 00:26:05 GMT"
},
{
"version": "v3",
"created": "Thu, 8 Nov 2007 23:11:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dasgupta",
"Keshav",
""
],
[
"Hussin",
"Veronique",
""
],
[
"Wissanji",
"Alisha",
""
]
] |
0708.1024 | Maxim Lyutikov | Maxim Lyutikov (Purdue University) | Neutron star magnetospheres: the binary pulsar, Crab and magnetars | Proceedings, Huangshan meeting "Astrophysics of Compact Objects" | AIPConf.Proc.968:77-84,2008 | 10.1063/1.2840457 | null | astro-ph | null | A number of disparate observational and theoretical pieces of evidence
indicate that, contrary to the conventional wisdom, neutron stars' closed field
lines are populated by dense, hot plasma and may be responsible for producing
some radio and high energy emission. This conclusion is based on eclipse
modeling of the binary pulsar system PSR J0737-3039A/B (Lyutikov & Thompson
2005), a quantitative theory of Crab giant pulses (Lyutikov 2007) and a number
of theoretical works related to production of non-thermal spectra in magnetars
through resonant scattering. In magnetars, dense pair plasma is produced by
twisting magnetic field lines and associated electric fields required to lift
the particles from the surface. In long period pulsars, hot particles on closed
field lines can be efficiently trapped by magnetic mirroring, so that
relatively low supply rate, e.g. due to a drift from open field lines, may
result in high density. In short period pulsars, magnetic mirroring does not
work; large densities may still be expected at the magnetic equator near the
Y-point.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 20:17:33 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lyutikov",
"Maxim",
"",
"Purdue University"
]
] |
0708.1025 | Geza Giedke | S. Perseguers, J. Wehr, A. Acin, M. Lewenstein and J. I. Cirac | Entanglement Distribution in Pure-State Quantum Networks | revtex4, 14 pages, 15 figures (.eps), submitted for publication | Phys. Rev. A 77, 022308 (2008) | 10.1103/PhysRevA.77.022308 | null | quant-ph | null | We investigate entanglement distribution in pure-state quantum networks. We
consider the case when non-maximally entangled two-qubit pure states are shared
by neighboring nodes of the network. For a given pair of nodes, we investigate
how to generate the maximal entanglement between them by performing local
measurements, assisted by classical communication, on the other nodes. We find
optimal measurement protocols for both small and large 1D networks. Quite
surprisingly, we prove that Bell measurements are not always the optimal ones
to perform in such networks. We generalize then the results to simple small 2D
networks, finding again counter-intuitive optimal measurement strategies.
Finally, we consider large networks with hierarchical lattice geometries and 2D
networks. We prove that perfect entanglement can be established on large
distances with probability one in a finite number of steps, provided the
initial entanglement shared by neighboring nodes is large enough. We discuss
also various protocols of entanglement distribution in 2D networks employing
classical and quantum percolation strategies.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 16:39:11 GMT"
},
{
"version": "v2",
"created": "Wed, 31 Oct 2007 12:05:34 GMT"
}
] | 2009-01-19T00:00:00 | [
[
"Perseguers",
"S.",
""
],
[
"Wehr",
"J.",
""
],
[
"Acin",
"A.",
""
],
[
"Lewenstein",
"M.",
""
],
[
"Cirac",
"J. I.",
""
]
] |
0708.1026 | Christopher Stockdale | Christopher J. Stockdale, Christopher L. Williams, Kurt W. Weiler,
Nino Panagia, Richard A. Sramek, Schuyler D. Van Dyk, and Matthew T. Kelley | The Radio Evolution of SN 2001gd | 3 tables, 2 figures, To appear in the Astrophysical Journal | null | 10.1086/522584 | null | astro-ph | null | We present the results of observations of the radio emission from Supernova
2001gd in NGC 5033 from 2002 February 8 through 2006 September 25. The data
were obtained using the Very Large Array at wavelengths of 1.3 cm (22.4 GHz), 2
cm (14.9 GHz), 3.6 cm (8.4 GHz), 6 cm (4.9 GHz), and 20 cm (1.5 GHz), with one
upper limit at 90 cm (0.3 GHz). In addition, one detection has been provided by
the Giant Metrewave Radio Telescope at 21 cm (1.4 GHz). SN 2001gd was
discovered in the optical well past maximum light, so that it was not possible
to obtain many of the early radio "turn-on" measurements which are important
for estimating the local circumstellar medium (CSM) properties. Only at 20 cm
were turn-on data available. However, our analysis and fitting of the radio
light curves, and the assumption that the Type IIb SN 2001gd resembles the much
better studied Type IIb SN 1993J, enables us to describe the radio evolution as
being very regular through day ~550 and consistent with a nonthermal-emitting
model with a thermal absorbing CSM. The presence of synchrotron-self absorption
(SSA) at early times is implied by the data, but determination of the exact
relationship between the SSA component from the emitting region and the
free-free absorption component from the CSM is not possible as there are
insufficient early measurements to distinguish between models. After day ~550,
the radio emission exhibits a dramatically steeper decline rate which, assuming
similarity to SN 1993J, can be described as an exponential decrease with an
e-folding time of 500 days. We interpret this abrupt change in the radio flux
density decline rate as implying a transition of the shock front into a more
tenuous region of circumstellar material. A similar change in radio evolution
has been seen earlier in other SNe such as SN 1988Z, SN 1980K, and SN 1993J.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 20:29:41 GMT"
},
{
"version": "v2",
"created": "Fri, 10 Aug 2007 15:44:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Stockdale",
"Christopher J.",
""
],
[
"Williams",
"Christopher L.",
""
],
[
"Weiler",
"Kurt W.",
""
],
[
"Panagia",
"Nino",
""
],
[
"Sramek",
"Richard A.",
""
],
[
"Van Dyk",
"Schuyler D.",
""
],
[
"Kelley",
"Matthew T.",
""
]
] |
0708.1027 | G. -H. Gweon | G.-H. Gweon, T. Sasagawa, H. Takagi, D.-H. Lee, A. Lanzara | Unusual oxygen isotope effects in cuprates -- importance of doping | null | null | null | null | cond-mat.supr-con cond-mat.str-el | null | A recent angle resolved photoelectron spectroscopy (ARPES) study by Douglas
et al. \cite {dessau-comment} on oxygen isotope exchanged
Bi_2Sr_2CaCu_2O$_{8+\delta}$ superconductors reported an absence of isotope
effect at optimal doping, questioning the previous work by us \cite
{gweon-nature}. Here, we report a new result that sheds light on this puzzling
discrepancy as well as the nature of the electron lattice interaction in the
cuprates: the anomalous isotope effect at optimal doping \cite {gweon-nature},
re-confirmed here, vanishes on a mere 2 % overdoping of holes. This result
implies a rapid change of the nature of the electron-lattice interaction near
optimal doping. We also find that the data by Douglas et al. \cite
{dessau-comment} are actually characteristic of significantly over-doped
samples, not of optimally doped samples as they claimed.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 20:44:51 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Gweon",
"G. -H.",
""
],
[
"Sasagawa",
"T.",
""
],
[
"Takagi",
"H.",
""
],
[
"Lee",
"D. -H.",
""
],
[
"Lanzara",
"A.",
""
]
] |
0708.1028 | Christopher Gorham Lester | Christopher Lester and Alan Barr | MTGEN : Mass scale measurements in pair-production at colliders | 22 pages, 4 figures. [v2 fixes minor typos and clarifies some
information regarding jets. Also a little more info regarding MT2. v3 fixes
one more typo. v4 included an Addendum highlighting a relevant result from a
later paper (by other authors) which simplifies one of the key results of the
paper] | JHEP 0712:102,2007 | 10.1088/1126-6708/2007/12/102 | Cavendish-HEP-2007-05 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new kinematic event variable MTGEN which can provide
information relating to the mass scales of particles pair-produced at hadronic
and leptonic colliders. The variable is of particular use in events with a
large number of particles in the final state when some of those particles are
massive and not detected, such as may arise in R-parity-conserving
supersymmetry.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 21:18:13 GMT"
},
{
"version": "v2",
"created": "Fri, 26 Oct 2007 13:31:44 GMT"
},
{
"version": "v3",
"created": "Sat, 27 Oct 2007 15:00:29 GMT"
},
{
"version": "v4",
"created": "Thu, 6 Aug 2009 15:33:57 GMT"
}
] | 2009-08-06T00:00:00 | [
[
"Lester",
"Christopher",
""
],
[
"Barr",
"Alan",
""
]
] |
0708.1029 | John Cumalat | J. M. Link, et al. (for the FOCUS Collaboration) | Study of Cabibbo Suppressed Decays of the Ds Charmed-Strange Meson
involving a KS | 11 pages, 6 figures | Phys.Lett.B660:147-153,2008 | 10.1016/j.physletb.2007.12.050 | FERMILAB-PUB-07-410 | hep-ex | null | We study the decay of Ds meson into final states involving a Ks and report
the discovery of Cabibbo suppressed decay modes Ds -> Kspi-pi+pi+ (179 +/- 36
events) and Ds -> Kspi+ (113 +/-26 events). The branching ratios for the new
modes are Gamma(Ds -> Kspi-pi+pi+)/Gamma(Ds -> KsK-pi+pi+) = 0.18 +/- 0.04 +/-
0.05 and Gamma(Ds -> Kspi+)/Gamma(Ds -> KsK+) = 0.104 +/- 0.024 +/- 0.013.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 21:23:37 GMT"
}
] | 2019-08-13T00:00:00 | [
[
"Link",
"J. M.",
""
]
] |
0708.1030 | John Wisniewski | John P. Wisniewski (1), Karen S. Bjorkman (2), Jon E. Bjorkman (3),
and Mark Clampin (1) ((1) NASA GSFC, (2) University of Toledo) | Discovery of a New Dusty B[e] Star in the Small Magellanic Cloud | 12 pages, accepted by ApJ | Astrophys.J.670:1331-1336,2007 | 10.1086/522330 | null | astro-ph | null | We present new optical spectroscopic and archival Spitzer IRAC photometric
observations of a B-type star in the SMC cluster NGC 346, NGC 346:KWBBe 200. We
detect numerous Fe II, [O I], and [Fe II] lines, as well as strong P-Cygni
profile H I emission lines in its optical spectrum. The star's near-IR color
and optical to IR SED clearly indicate the presence of an infrared excess,
consistent with the presence of gas and warm, T ~800 K, circumstellar dust.
Based on a crude estimate of the star's luminosity and the observed
spectroscopic line profile morphologies, we find that the star is likely to be
a B-type supergiant. We suggest that NGC 346:KWBBe 200 is a newly discovered
B[e] supergiant star, and represents the fifth such object to be identified in
the SMC.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 21:57:24 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Wisniewski",
"John P.",
"",
"NASA GSFC"
],
[
"Bjorkman",
"Karen S.",
"",
"University of Toledo"
],
[
"Bjorkman",
"Jon E.",
"",
"NASA GSFC"
],
[
"Clampin",
"Mark",
"",
"NASA GSFC"
]
] |
0708.1031 | Steven G. Johnson | Chris Kottke, Ardavan Farjadpour, and Steven G. Johnson | Perturbation theory for anisotropic dielectric interfaces, and
application to sub-pixel smoothing of discretized numerical methods | 10 pages | null | 10.1103/PhysRevE.77.036611 | null | physics.optics physics.comp-ph | null | We derive a correct first-order perturbation theory in electromagnetism for
cases where an interface between two anisotropic dielectric materials is
slightly shifted. Most previous perturbative methods give incorrect results for
this case, even to lowest order, because of the complicated discontinuous
boundary conditions on the electric field at such an interface. Our final
expression is simply a surface integral, over the material interface, of the
continuous field components from the unperturbed structure. The derivation is
based on a "localized" coordinate-transformation technique, which avoids both
the problem of field discontinuities and the challenge of constructing an
explicit coordinate transformation by taking a limit in which a coordinate
perturbation is infinitesimally localized around the boundary. Not only is our
result potentially useful in evaluating boundary perturbations, e.g. from
fabrication imperfections, in highly anisotropic media such as many
metamaterials, but it also has a direct application in numerical
electromagnetism. In particular, we show how it leads to a sub-pixel smoothing
scheme to ameliorate staircasing effects in discretized simulations of
anisotropic media, in such a way as to greatly reduce the numerical errors
compared to other proposed smoothing schemes.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 21:48:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kottke",
"Chris",
""
],
[
"Farjadpour",
"Ardavan",
""
],
[
"Johnson",
"Steven G.",
""
]
] |
0708.1032 | Alessandro Tomasiello | Nick Halmagyi and Alessandro Tomasiello | Generalized Kaehler Potentials from Supergravity | "38 pages. v3: improved exposition and minor mistakes corrected in
sec. 4" | Commun.Math.Phys.291:1-30,2009 | 10.1007/s00220-009-0881-6 | EFI-07-22, SU-ITP-07/12 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider supersymmetric N=2 solutions with non-vanishing NS three-form.
Building on worldsheet results, we reduce the problem to a single generalized
Monge-Ampere equation on the generalized Kaehler potential K recently
interpreted geometrically by Lindstrom, Rocek, Von Unge and Zabzine. One input
in the procedure is a holomorphic function w that can be thought of as the
effective superpotential for a D3 brane probe. The procedure is hence likely to
be useful for finding gravity duals to field theories with non-vanishing
abelian superpotential, such as Leigh-Strassler theories. We indeed show that a
purely NS precursor of the Lunin-Maldacena dual to the beta-deformed N=4
super-Yang-Mills falls in our class.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 22:21:41 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 18:50:48 GMT"
},
{
"version": "v3",
"created": "Mon, 24 Nov 2008 21:09:23 GMT"
}
] | 2009-08-11T00:00:00 | [
[
"Halmagyi",
"Nick",
""
],
[
"Tomasiello",
"Alessandro",
""
]
] |
0708.1033 | Steve Elliott | Frank T. Avignone III, Steven R. Elliott, and Jonathan Engel | Double Beta Decay, Majorana Neutrinos, and Neutrino Mass | invited submission to Reviews of Modern Physics, higher resolution
figures available upon request from authors, Version 2 has fixed typos and
some changes after referee reports | Rev.Mod.Phys.80:481-516,2008 | 10.1103/RevModPhys.80.481 | LA-UR-07-3577 | nucl-ex hep-ph nucl-th | null | The theoretical and experimental issues relevant to neutrinoless double-beta
decay are reviewed. The impact that a direct observation of this exotic process
would have on elementary particle physics, nuclear physics, astrophysics and
cosmology is profound. Now that neutrinos are known to have mass and
experiments are becoming more sensitive, even the non-observation of
neutrinoless double-beta decay will be useful. If the process is actually
observed, we will immediately learn much about the neutrino. The status and
discovery potential of proposed experiments are reviewed in this context, with
significant emphasis on proposals favored by recent panel reviews. The
importance of and challenges in the calculation of nuclear matrix elements that
govern the decay are considered in detail. The increasing sensitivity of
experiments and improvements in nuclear theory make the future exciting for
this field at the interface of nuclear and particle physics.
| [
{
"version": "v1",
"created": "Tue, 7 Aug 2007 22:36:04 GMT"
},
{
"version": "v2",
"created": "Mon, 26 Nov 2007 20:30:47 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Avignone",
"Frank T.",
"III"
],
[
"Elliott",
"Steven R.",
""
],
[
"Engel",
"Jonathan",
""
]
] |
0708.1034 | David Gamarnik | David Gamarnik, Dmitriy Katz | On deciding stability of multiclass queueing networks under buffer
priority scheduling policies | Published in at http://dx.doi.org/10.1214/09-AAP597 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2009, Vol. 19, No. 5, 2008-2037 | 10.1214/09-AAP597 | IMS-AAP-AAP597 | math.PR math.OC | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the basic properties of a queueing network is stability. Roughly
speaking, it is the property that the total number of jobs in the network
remains bounded as a function of time. One of the key questions related to the
stability issue is how to determine the exact conditions under which a given
queueing network operating under a given scheduling policy remains stable.
While there was much initial progress in addressing this question, most of the
results obtained were partial at best and so the complete characterization of
stable queueing networks is still lacking. In this paper, we resolve this open
problem, albeit in a somewhat unexpected way. We show that characterizing
stable queueing networks is an algorithmically undecidable problem for the case
of nonpreemptive static buffer priority scheduling policies and deterministic
interarrival and service times. Thus, no constructive characterization of
stable queueing networks operating under this class of policies is possible.
The result is established for queueing networks with finite and infinite buffer
sizes and possibly zero service times, although we conjecture that it also
holds in the case of models with only infinite buffers and nonzero service
times. Our approach extends an earlier related work [Math. Oper. Res. 27 (2002)
272--293] and uses the so-called counter machine device as a reduction tool.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 01:47:43 GMT"
},
{
"version": "v2",
"created": "Thu, 19 Nov 2009 09:00:06 GMT"
}
] | 2009-11-19T00:00:00 | [
[
"Gamarnik",
"David",
""
],
[
"Katz",
"Dmitriy",
""
]
] |
0708.1035 | Thomas J. Weiler | Ralf Lehnert and Thomas J. Weiler | Neutrino flavor ratios as diagnostic of solar WIMP annihilation | 30 pages, including 10 figures and 4 appendices | Phys.Rev.D77:125004,2008 | 10.1103/PhysRevD.77.125004 | MIT-CTP-3849, MPP-2007-97 | hep-ph astro-ph | null | We consider the neutrino (and antineutrino) flavors arriving at Earth for
neutrinos produced in the annihilation of weakly interacting massive particles
(WIMPs) in the Sun's core. Solar-matter effects on the flavor propagation of
the resulting $\agt$ GeV neutrinos are studied analytically within a
density-matrix formalism. Matter effects, including mass-state level-crossings,
influence the flavor fluxes considerably. The exposition herein is somewhat
pedagogical, in that it starts with adiabatic evolution of single flavors from
the Sun's center, with $\theta_{13}$ set to zero, and progresses to fully
realistic processing of the flavor ratios expected in WIMP decay, from the
Sun's core to the Earth. In the fully realistic calculation, non-adiabatic
level-crossing is included, as are possible nonzero values for $\theta_{13}$
and the CP-violating phase $\delta$. Due to resonance enhancement in matter,
nonzero values of $\theta_{13}$ even smaller than a degree can noticeably
affect flavor propagation. Both normal and inverted neutrino-mass hierarchies
are considered. Our main conclusion is that measuring flavor ratios (in
addition to energy spectra) of $\agt$ GeV solar neutrinos can provide
discrinination between WIMP models. In particular, we demonstrate the flavor
differences at Earth for neutrinos from the two main classes of WIMP final
states, namely $W^+ W^-$ and 95% $b \bar{b}$ + 5% $\tau^+\tau^-$. Conversely,
if WIMP properties were to be learned from production in future accelerators,
then the flavor ratios of $\agt$ GeV solar neutrinos might be useful for
inferring $\theta_{13}$ and the mass hierarchy.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 01:43:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Lehnert",
"Ralf",
""
],
[
"Weiler",
"Thomas J.",
""
]
] |
0708.1036 | Bobby Eka Gunara | Bobby E. Gunara and Freddy P. Zen | Kaehler-Ricci Flow, Morse Theory, and Vacuum Structure Deformation of
N=1 Supersymmetry in Four Dimensions | Typos and grammar corrected, 41 pages, published version | Adv.Theor.Math.Phys.13:217,2009 | null | null | hep-th math-ph math.DG math.DS math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address some aspects of four dimensional chiral N=1 supersymmetric
theories on which the scalar manifold is described by K\"ahler geometry and can
further be viewed as K\"ahler-Ricci soliton generating a one-parameter family
of K\"ahler geometries. All couplings and solutions, namely the BPS domain
walls and their supersymmetric Lorentz invariant vacua turn out to be evolved
with respect to the flow parameter related to the soliton. Two models are
discussed, namely N=1 theory on K\"ahler-Einstein manifold and U(n) symmetric
K\"ahler-Ricci soliton with positive definite metric. In the first case we find
that the evolution of the soliton causes topological change and
correspondingly, modifies the Morse index of the nondegenerate vacua realized
in the parity transformation of the Hessian matrix of the scalar potential
after hitting singularity, which is natural in the global theory and for
nondegenerate Minkowskian vacua of the local theory. However, such situation is
not trivial in anti de Sitter (AdS) vacua. In an explicit model, we find that
this geometric (K\"ahler-Ricci) flow can also change the index of the vacuum
before and after singularity. Finally in the second case, since around the
origin the metric is diffeomorphic to $ {\mathrm{\lC P}}^{n -1}$, we have to
consider it in the asymptotic region. Our analysis shows that no index
modification of vacua is present in both global and local theories.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 05:17:18 GMT"
},
{
"version": "v2",
"created": "Sat, 17 Nov 2007 00:15:32 GMT"
},
{
"version": "v3",
"created": "Sat, 21 Jun 2008 05:15:47 GMT"
},
{
"version": "v4",
"created": "Sun, 28 Sep 2008 04:25:14 GMT"
},
{
"version": "v5",
"created": "Wed, 5 Nov 2008 03:53:35 GMT"
}
] | 2009-03-12T00:00:00 | [
[
"Gunara",
"Bobby E.",
""
],
[
"Zen",
"Freddy P.",
""
]
] |
0708.1037 | Yoichiro Watanabe | Yoichiro Watanabe and Koichi Kamoi | A Formulation of the Channel Capacity of Multiple-Access Channel | This paper has been submitted to IEEE Transactions on Information
Theory in March, 2007. 10 pages, 4 figures | null | null | Proc. 2002 IEEE Int'l Sym. on Information Theory, Lausanne, p.308,
2002 | cs.IT math.IT | null | The necessary and sufficient condition of the channel capacity is rigorously
formulated for the N-user discrete memoryless multiple-access channel (MAC).
The essence of the formulation is to invoke an {\em elementary} MAC where sizes
of input alphabets are not greater than the size of output alphabet. The main
objective is to demonstrate that the channel capacity of an MAC is achieved by
an elementary MAC included in the original MAC. The proof is quite
straightforward by the very definition of the elementary MAC. Moreover it is
proved that the Kuhn-Tucker conditions of the elementary MAC are strictly
sufficient and obviously necessary for the channel capacity. The latter proof
requires some steps such that for the elementary MAC every solution of the
Kuhn-Tucker conditions reveals itself as local maximum on the domain of all
possible input probability distributions and then it achieves the channel
capacity. As a result, in respect of the channel capacity, the MAC in general
can be regarded as an aggregate of a finite number of elementary MAC's.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 02:28:27 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Watanabe",
"Yoichiro",
""
],
[
"Kamoi",
"Koichi",
""
]
] |
0708.1038 | Shao-Feng Wu | Shao-Feng Wu, Auttakit Chatrabhuti, Guo-Hong Yang, and Peng-Ming Zhang | Crossing the phantom divide in brane cosmology with curvature
corrections and brane-bulk energy transfer | 11 pages,3 figures, revtex4, revised version, accepted for
publication in Phys. Lett. B | Phys.Lett.B659:45-53,2008 | 10.1016/j.physletb.2007.10.087 | null | astro-ph | null | We consider the Randall-Sundrum brane-world model with bulk-brane energy
transfer where the Einstein-Hilbert action is modified by curvature correction
terms: a four-dimensional scalar curvature from induced gravity on the brane,
and a five-dimensional Gauss-Bonnet curvature term. It is remarkable that these
curvature terms will not change the dynamics of the brane universe at low
energy. Parameterizing the energy transfer and taking the dark radiation term
into account, we find that the phantom divide of the equation of state of
effective dark energy could be crossed, without the need of any new dark energy
components. Fitting the two most reliable and robust SNIa datasets, the 182
Gold dataset and the Supernova Legacy Survey (SNLS), our model indeed has a
small tendency of phantom divide crossing for the Gold dataset, but not for the
SNLS dataset. Furthermore, combining the recent detection of the SDSS baryon
acoustic oscillations peak (BAO) with lower matter density parameter prior, we
find that the SNLS dataset also mildly favors phantom divide crossing.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 02:46:15 GMT"
},
{
"version": "v2",
"created": "Mon, 29 Oct 2007 12:01:12 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wu",
"Shao-Feng",
""
],
[
"Chatrabhuti",
"Auttakit",
""
],
[
"Yang",
"Guo-Hong",
""
],
[
"Zhang",
"Peng-Ming",
""
]
] |
0708.1039 | Minho Choi | Minho Choi, Ken'ichi Tatematsu, Geumsook Park, and Miju Kang | Ammonia Imaging of the Disks in the NGC 1333 IRAS 4A Protobinary System | null | null | 10.1086/522116 | null | astro-ph | null | The NGC 1333 IRAS 4A protobinary was observed in the ammonia (2, 2) and (3,
3) lines and in the 1.3 cm continuum with a high resolution (about 1.0 arcsec).
The ammonia maps show two compact sources, one for each protostar, and they are
probably protostellar accretion disks. The disk associated with IRAS 4A2 is
seen nearly edge-on and shows an indication of rotation. The A2 disk is
brighter in the ammonia lines but dimmer in the dust continuum than its sibling
disk, with the ammonia-to-dust flux ratios different by about an order of
magnitude. This difference suggests that the twin disks have surprisingly
dissimilar characters, one gas-rich and the other dusty. The A2 disk may be
unusually active or hot, as indicated by its association with water vapor
masers. The existence of two very dissimilar disks in a binary system suggests
that the formation process of multiple systems has a controlling agent lacking
in the isolated star formation process and that stars belonging to a multiple
system do not necessarily evolve in phase with each other.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 02:47:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Choi",
"Minho",
""
],
[
"Tatematsu",
"Ken'ichi",
""
],
[
"Park",
"Geumsook",
""
],
[
"Kang",
"Miju",
""
]
] |
0708.1040 | Christopher J. Conselice | C. J. Conselice, K. Bundy, I. Trujillo, A. Coil, P. Eisenhardt, R.S.
Ellis, A. Georgakakis, J. Huang, J. Lotz, K. Nandra, J. Newman, C. Papovich,
B. Weiner, C. Willmer | The Properties and Evolution of a K-band Selected Sample of Massive
Galaxies at z~0.4 - 2 in the Palomar/DEEP2 Survey | MNRAS, in press, 28 pages | null | 10.1111/j.1365-2966.2007.12316.x | null | astro-ph | null | We present the results of a study on the properties and evolution of massive
(M_* > 10^11 M_0) galaxies at z~0.4 - 2 utilising Keck spectroscopy,
near-Infrared Palomar imaging, and Hubble, Chandra, and Spitzer data covering
fields targeted by the DEEP2 galaxy spectroscopic survey. Our sample is K band
selected based on wide-area NIR imaging from the Palomar Observatory Wide-Field
Infrared Survey, which covers 1.53 deg^2 to K_s,vega~20.5. Our major findings
include: (i) statistically the mass and number densities of M_* > 10^11 M_0
galaxies show little evolution between z = 0 - 1, and from z ~ 0 - 2 for M_* >
10^11.5 M_0 galaxies. (ii) Using Hubble ACS imaging, we find that M_* > 10^11
selected galaxies show a nearly constant elliptical fraction of ~70-90% at all
redshifts. The remaining objects are peculiars possibly undergoing mergers at z
> 0.8, while spirals dominate the remainder at lower redshifts. (iii) We find
that only a fraction (~60%) of massive galaxies with M_* > 10^11 M_0 are on the
red-sequence at z~1.4, while nearly 100% evolve onto it by z~0.4. (iv) By
utilising Spitzer MIPS imaging and [OII] line fluxes we argue that M_* >
10^11.5 galaxies have a steeply declining star formation rate density ~(1+z)^6.
By examining the contribution of star formation to the evolution of the mass
function, as well as the merger history through the CAS parameters, we
determine that M_* >10^11 M_0 galaxies undergo on average 0.9^+0.7_-0.5 major
mergers at 0.4 < z < 1.4. (v) A high (5%) fraction of all M_* > 10^11 M_0
galaxies are X-ray emitters. Roughly half of these are morphologically
distorted ellipticals or peculiars. We compare our results with the Millennium
simulation, finding that the number and mass densities of M_* > 10^11.5 M_0
galaxies are under predicted by a factor of > 100.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 02:48:12 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Conselice",
"C. J.",
""
],
[
"Bundy",
"K.",
""
],
[
"Trujillo",
"I.",
""
],
[
"Coil",
"A.",
""
],
[
"Eisenhardt",
"P.",
""
],
[
"Ellis",
"R. S.",
""
],
[
"Georgakakis",
"A.",
""
],
[
"Huang",
"J.",
""
],
[
"Lotz",
"J.",
""
],
[
"Nandra",
"K.",
""
],
[
"Newman",
"J.",
""
],
[
"Papovich",
"C.",
""
],
[
"Weiner",
"B.",
""
],
[
"Willmer",
"C.",
""
]
] |
0708.1041 | D. M. Cardamone | David M. Cardamone and George Kirczenow | Single-Molecule Device Prototypes for Protein-Based Nanoelectronics:
Negative Differential Resistance and Current Rectification in Oligopeptides | 8 pages, 6 figures, 1 table. v2: new discussion of conductance as a
function of molecular stretching, including new Fig. 3; expanded discussion
of solution of the electrostatics problem; minor correction to Fig. 4 (was
old Fig. 3); and minor clarifications throughout | Physical Review B, Volume 77, 165403 (2008) | 10.1103/PhysRevB.77.165403 | null | cond-mat.mes-hall | null | We investigate electrical conduction through individual oligopeptide
molecules thiol-bonded between gold nanocontacts using ab initio and
semi-empirical techniques. Our theory explains for the first time these
molecules' experimentally observed current-voltage characteristics, including
both the magnitude and rectification of the current, and uses no adjustable
parameters. We identify the mechanism of the observed current rectification,
and predict that it will result in negative differential resistance at moderate
biases. Our findings open the way to the realization of protein-based
nanoelectronic devices.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 02:51:40 GMT"
},
{
"version": "v2",
"created": "Sun, 6 Jan 2008 04:55:37 GMT"
}
] | 2008-04-15T00:00:00 | [
[
"Cardamone",
"David M.",
""
],
[
"Kirczenow",
"George",
""
]
] |
0708.1042 | Yuichi Kasahara | Y. Kasahara, T. Iwasawa, H. Shishido, T. Shibauchi, K. Behnia, Y.
Haga, T. D. Matsuda, Y. Onuki, M. Sigrist, Y. Matsuda | Exotic Superconducting Properties in the Electron-Hole Compensated Heavy
Fermion `Semimetal' URu2Si2 | 4 pages, 4 figures, accepted for publication in Phys. Rev. Lett | null | 10.1103/PhysRevLett.99.116402 | null | cond-mat.supr-con cond-mat.str-el | null | We show that the charge and thermal transport measurements on ultraclean
crystals of URu2Si2 reveal a number of unprecedented superconducting
properties. The uniqueness is best highlighted by the peculiar field dependence
of thermal conductivity including the first order transition at Hc2 with a
reduction of entropy flow. This is a consequence of multi-band
superconductivity with compensated electronic structure in the hidden order
state of this system. We provide strong evidence for a new type of
unconventional superconductivity with two distinct gaps having different nodal
topology.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 04:15:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kasahara",
"Y.",
""
],
[
"Iwasawa",
"T.",
""
],
[
"Shishido",
"H.",
""
],
[
"Shibauchi",
"T.",
""
],
[
"Behnia",
"K.",
""
],
[
"Haga",
"Y.",
""
],
[
"Matsuda",
"T. D.",
""
],
[
"Onuki",
"Y.",
""
],
[
"Sigrist",
"M.",
""
],
[
"Matsuda",
"Y.",
""
]
] |
0708.1043 | Kohei Motegi | Kohei Motegi and Kazumitsu Sakai | Form factors and correlation functions of an interacting spinless
fermion model | 18 pages, v2: typos corrected, published version | Nucl. Phys. B 793 (2008) 451-468 | 10.1016/j.nuclphysb.2007.10.009 | null | cond-mat.stat-mech math-ph math.MP nlin.SI | null | Introducing the fermionic R-operator and solutions of the inverse scattering
problem for local fermion operators, we derive a multiple integral
representation for zero-temperature correlation functions of a one-dimensional
interacting spinless fermion model. Correlation functions particularly
considered are the one-particle Green's function and the density-density
correlation function both for any interaction strength and for arbitrary
particle densities. In particular for the free fermion model, our formulae
reproduce the known exact results. Form factors of local fermion operators are
also calculated for a finite system.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 04:40:35 GMT"
},
{
"version": "v2",
"created": "Fri, 18 Jan 2008 06:19:16 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Motegi",
"Kohei",
""
],
[
"Sakai",
"Kazumitsu",
""
]
] |
0708.1044 | Shintaro Nomura | Kohei Tsumura, Shintaro Nomura, Pamela Mohan, Junichi Motohisa, and
Takashi Fukui | Aharonov-Bohm Oscillations in Photoluminescence from Charged Exciton in
Quantum Tubes | 14 pages, 4 figures | Japanese Journal of Applied Physics Vol. 46, No. 18, 2007, pp.
L440-L443 | 10.1143/JJAP.46.L440 | null | cond-mat.mes-hall | null | The oscillation of photoluminescence peak energies is observed in InAs
quantum tubes depending on the magnetic flux through the tube. The oscillation
is shown to be due to the Aharonov-Bohm effect of a charged exciton in a
quantum tube. No quadratic shift in photoluminescence peak energies is
observed, which is a characteristic feature of a thin quantum tube with a
single channel surrounding the magnetic flux through the tube.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 04:32:39 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Tsumura",
"Kohei",
""
],
[
"Nomura",
"Shintaro",
""
],
[
"Mohan",
"Pamela",
""
],
[
"Motohisa",
"Junichi",
""
],
[
"Fukui",
"Takashi",
""
]
] |
0708.1045 | Masako Yamada | Masako Yamada, Keiichi Wada, and Kohji Tomisaka | HCN to HCO^+ Millimeter Line Diagnostics of AGN Molecular Torus I :
Radiative Transfer Modeling | 29 pages, 13 figures, Accepted for publication in ApJ, For high
resolution figures see http://alma.mtk.nao.ac.jp/~masako/MS72533v2.pdf | null | 10.1086/522332 | null | astro-ph | null | We explore millimeter line diagnostics of an obscuring molecular torus
modeled by a hydrodynamic simulation with three-dimensional nonLTE radiative
transfer calculations. Based on the results of high-resolution hydrodynamic
simulation of the molecular torus around an AGN, we calculate intensities of
HCN and HCO^{+} rotational lines as two representative high density tracers.
The three-dimensional radiative transfer calculations shed light on a
complicated excitation state in the inhomogeneous torus, even though a
spatially uniform chemical structure is assumed. Our results suggest that HCN
must be much more abundant than HCO^{+} in order to obtain a high ratio
($R_{HCN/HCO+}\sim 2$) observed in some of the nearby galaxies. There is a
remarkable dispersion in the relation between integrated intensity and column
density, indicative of possible shortcomings of HCN(1-0) and HCO^{+}(1-0) lines
as high density tracers. The internal structures of the inhomogeneous molecular
torus down to subparsec scale in external galaxies will be revealed by the
forthcoming Atacama Large Millimeter/submillimeter Array (ALMA). The
three-dimensional radiative transfer calculations of molecular lines with
high-resolution hydrodynamic simulation prove to be a powerful tool to provide
a physical basis for molecular line diagnostics of the central regions of
external galaxies.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 05:13:31 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yamada",
"Masako",
""
],
[
"Wada",
"Keiichi",
""
],
[
"Tomisaka",
"Kohji",
""
]
] |
0708.1046 | Galina Korotkova Gennadievna | Igor D. Karachentsev, Valentina E. Karachentseva, Walter K.
Huchtmeier, Dmitry I. Makarov, and Serafim S. Kaisin | Probe of dark galaxies via disturbed/ lopsided isolated galaxies | To appear in proceedings IAU Symp 244, 'Dark Galaxies and Lost
Baryons', June 2007 | null | 10.1017/S1743921307014044 | null | astro-ph | null | Searching for lopsided/interacting objects among ~1500 isolated galaxies
yields only eight strongly disturbed galaxies which may be explained as a
result of their interaction with massive dark objects. We present results of
spectral and photometric observations of these galaxies performed with the 6-m
telescope that lead to significant restriction on cosmic abundance of dark
galaxies.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 11:48:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Karachentsev",
"Igor D.",
""
],
[
"Karachentseva",
"Valentina E.",
""
],
[
"Huchtmeier",
"Walter K.",
""
],
[
"Makarov",
"Dmitry I.",
""
],
[
"Kaisin",
"Serafim S.",
""
]
] |
0708.1047 | Gideon Maschler | Gideon Maschler (Emory University) | Special K\"ahler-Ricci potentials and Ricci solitons | 13 pages, corrected Report-no | null | null | TR-2007-016 | math.DG | null | On a manifold of dimension at least six, let $(g,\tau)$ be a pair consisting
of a K\"ahler metric g which is locally K\"ahler irreducible, and a nonconstant
smooth function $\tau$. Off the zero set of $\tau$, if the metric
$\hat{g}=g/\tau^2$ is a gradient Ricci soliton which has soliton function
$1/\tau$, we show that $\hat{g}$ is K\"ahler with respect to another complex
structure, and locally of a type first described by Koiso. Moreover, $\tau$ is
a special K\"ahler-Ricci potential, a notion defined in earlier works of
Derdzinski and Maschler. The result extends to dimension four with additional
assumptions. We also discuss a Ricci-Hessian equation, which is a
generalization of the soliton equation, and observe that the set of pairs
$(g,\tau)$ satisfying a Ricci-Hessian equation is invariant, in a suitable
sense, under the map $(g,\tau)\to (\hat{g},1/\tau)$.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 17:26:28 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Maschler",
"Gideon",
"",
"Emory University"
]
] |
0708.1048 | Alexander Vasil'ev | Dmitri Prokhorov, Alexander Vasil'ev | Singular and tangent slit solutions to the Loewner equation | 8 pages | null | null | null | math.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Loewner differential equation generating univalent maps of
the unit disk (or of the upper half-plane) onto itself minus a single slit. We
prove that the circular slits, tangent to the real axis are generated by
H\"older continuous driving terms with exponent 1/3 in the Loewner equation.
Singular solutions are described, and the critical value of the norm of driving
terms generating quasisymmetric slits in the disk is obtained.
| [
{
"version": "v1",
"created": "Wed, 8 Aug 2007 06:21:50 GMT"
},
{
"version": "v2",
"created": "Mon, 23 Jun 2008 06:40:19 GMT"
}
] | 2008-06-23T00:00:00 | [
[
"Prokhorov",
"Dmitri",
""
],
[
"Vasil'ev",
"Alexander",
""
]
] |
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