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801.3273 | Johan Peter Uldall Fynbo | Johan P. U. Fynbo (1), J. Xavier Prochaska (2), Jesper Sommer-Larsen
(3,1), Miroslava Dessauges-Zavadsky (4), Palle Moller (5) ((1) Dark Cosmology
Centre, NBI, Copenhagen, Denmark; (2) UCO/Lick Observatory, USA; (3)
Excellence Cluster Universe, TUM, Munich, Germany; (4) Geneva Observatory,
Switzerland; (5) European Southern Observatory, Garching, Germany) | Reconciling the Metallicity Distributions of Gamma-ray Burst, Damped
Lyman-alpha, and Lyman-break Galaxies at z=3 | 31 pages, 6 figures. Accepted for publication in ApJ | Astrophys. J. 683 (2008) 321-328 | 10.1086/589555 | null | astro-ph | null | We test the hypothesis that the host galaxies of long-duration gamma-ray
bursts (GRBs) as well as quasar-selected damped Lyman-alpha (DLA) systems are
drawn from the population of UV-selected star-forming, high-z galaxies
(generally referred to as Lyman-break galaxies). Specifically, we compare the
metallicity distributions of the GRB and DLA populations to simple models where
these galaxies are drawn randomly from the distribution of star-forming
galaxies according to their star-formation rate and HI cross-section
respectively. We find that it is possible to match both observational
distributions assuming very simple and constrained relations between
luminosity, metallicity and HI sizes. The simple model can be tested by
observing the luminosity distribution of GRB host galaxies and by measuring the
luminosity and impact parameters of DLA selected galaxies as a function of
metallicity. Our results support the expectation that GRB and DLA samples, in
contrast to magnitude limited surveys, provide an almost complete census of z=3
star-forming galaxies that are not heavily dust-obscured.
| [
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{
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"created": "Sun, 13 Apr 2008 10:55:13 GMT"
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] | 2008-08-08T00:00:00 | [
[
"Fynbo",
"Johan P. U.",
""
],
[
"Prochaska",
"J. Xavier",
""
],
[
"Sommer-Larsen",
"Jesper",
""
],
[
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"Miroslava",
""
],
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""
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801.3274 | Zohar Komargodski | Zohar Komargodski | On collinear factorization of Wilson loops and MHV amplitudes in N=4 SYM | 26 pages, 7 figures, JHEP format. v2: minor corrections. v3: minor
improvements | JHEP 0805:019,2008 | 10.1088/1126-6708/2008/05/019 | WIS/01/08-JAN-DPP | hep-th | null | We consider the (multi) Splitting function of Wilson loops and MHV gluon
scattering S matrix elements in N=4 SYM. At strong coupling, one can utilize
the methods of Alday and Maldacena and at weak coupling (one loop) the
correspondence to light like Wilson loops is used. In both cases, the (multi)
Splitting function corresponds to flattened cusps in the light like polygon,
allowing for a clean disentanglement from the other gluons. We compute it in
some cases and estimate some terms in other cases. We also prove the anomalous
Ward identity of Drummond et al. in the strong coupling regime. Lastly, we
briefly comment on a possible strategy for a proof of collinear factorization
of Wilson loops at higher orders of perturbation theory.
| [
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},
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"version": "v2",
"created": "Tue, 11 Mar 2008 21:24:57 GMT"
},
{
"version": "v3",
"created": "Thu, 17 Apr 2008 12:24:48 GMT"
}
] | 2014-11-18T00:00:00 | [
[
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"Zohar",
""
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801.3275 | Robert Feldmann | R. Feldmann, C. M. Carollo, C. Porciani, S. J. Lilly, P. Oesch | The Zurich Extragalactic Bayesian Redshift Analyzer (ZEBRA), version 1.0
-- User manual | 33 pages, 3 Figures, 7 Tables. title and abstract adjusted. ZEBRA is
available at http://www.exp-astro.phys.ethz.ch/ZEBRA | null | null | null | astro-ph | null | ZEBRA, the Zurich Extragalactic Bayesian Redshift Analyzer, is a tool for
estimating redshifts and template types of galaxies using medium- and
broad-band photometric data. ZEBRA employs novel techniques within the
template-fitting approach to produce high-quality Maximum-Likelihood and
Bayesian redshift estimates.
This manuscript serves as a user guide to ZEBRA. It explains how to use
ZEBRA, specifies input and output formats, and gives a short account of the
available options. ZEBRA is a free and open-source software distributed under
the GNU Public License 3 and available at
http://www.exp-astro.phys.ethz.ch/ZEBRA .
Several upgrades are currently being implemented in ZEBRA. An updated
documentation will be provided at each new release. Any problems, comments and
suggestions on the code and the manual should be sent via e-mail to
[email protected].
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:11:25 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Feb 2008 09:39:38 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Feldmann",
"R.",
""
],
[
"Carollo",
"C. M.",
""
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[
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"C.",
""
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801.3276 | Asantha R. Cooray | Paolo Serra, Asantha Cooray (Irvine) | Impact of Secondary non-Gaussianities on the Search for Primordial
Non-Gaussianity with CMB Maps | 4 pages; submitted as a PRD Brief Report | Phys.Rev.D77:107305,2008 | 10.1103/PhysRevD.77.107305 | null | astro-ph | null | When constraining the primordial non-Gaussianity parameter f_NL with cosmic
microwave background anisotropy maps, the bias resulting from the covariance
between primordial non-Gaussianity and secondary non-Gaussianities to the
estimator of f_NL is generally assumed to be negligible. We show that this
assumption may not hold when attempting to measure the primordial
non-Gaussianity out to angular scales below a few tens arcminutes with an
experiment like Planck, especially if the primordial non-Gaussianity parameter
is around the minimum detectability level with f_NL between 5 and 10. In
future, it will be necessary to jointly estimate the combined primordial and
secondary contributions to the CMB bispectrum and establish f_NL by properly
accounting for the confusion from secondary non-Gaussianities.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:11:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Serra",
"Paolo",
"",
"Irvine"
],
[
"Cooray",
"Asantha",
"",
"Irvine"
]
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801.3277 | Doug Pickrell | Doug Pickrell | Homogeneous Poisson Structures on Loop Spaces of Symmetric Spaces | This is a contribution to the Special Issue on Kac-Moody Algebras and
Applications, published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4 (2008), 069, 33 pages | 10.3842/SIGMA.2008.069 | null | math.SG math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/3.0/ | This paper is a sequel to [Caine A., Pickrell D., arXiv:0710.4484], where we
studied the Hamiltonian systems which arise from the Evens-Lu construction of
homogeneous Poisson structures on both compact and noncompact type symmetric
spaces. In this paper we consider loop space analogues. Many of the results
extend in a relatively routine way to the loop space setting, but new issues
emerge. The main point of this paper is to spell out the meaning of the
results, especially in the SU(2) case. Applications include integral formulas
and factorizations for Toeplitz determinants.
| [
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"created": "Sun, 13 Jul 2008 17:30:49 GMT"
},
{
"version": "v4",
"created": "Tue, 7 Oct 2008 07:27:46 GMT"
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] | 2008-10-07T00:00:00 | [
[
"Pickrell",
"Doug",
""
]
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801.3278 | David Shih | Patrick Meade, Nathan Seiberg, David Shih | General Gauge Mediation | 19 pages, 1 figure, minor changes | Prog.Theor.Phys.Suppl.177:143-158,2009 | 10.1143/PTPS.177.143 | null | hep-ph hep-th | null | We give a general definition of gauge mediated supersymmetry breaking which
encompasses all the known gauge mediation models. In particular, it includes
both models with messengers as well as direct mediation models. A formalism for
computing the soft terms in the generic model is presented. Such a formalism is
necessary in strongly-coupled direct mediation models where perturbation theory
cannot be used. It allows us to identify features of the entire class of gauge
mediation models and to distinguish them from specific signatures of various
subclasses.
| [
{
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},
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},
{
"version": "v3",
"created": "Sat, 8 Mar 2008 00:04:57 GMT"
}
] | 2009-09-15T00:00:00 | [
[
"Meade",
"Patrick",
""
],
[
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"Nathan",
""
],
[
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""
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] |
801.3279 | Allan Greenleaf | Allan Greenleaf, Yaroslav Kurylev, Matti Lassas and Gunther Uhlmann | Comment on "Scattering Theory Derivation of a 3D Acoustic Cloaking
Shell" | 3 pages, RevTex | null | null | null | physics.optics | null | In a recent Letter, Cummer et al. give a description of material parameters
for acoustic wave propagation giving rise to a 3D spherical cloak, and verify
the cloaking phenomenon on the level of scattering coefficients. A similar
configuration has been given by Chen and Chan. In this Comment, we show that
these theoretical constructions follow directly from our earlier work
http://arxiv.org/abs/math/0611185 on full wave analysis of cloaking for the
Helmholtz equation with respect to Riemannian metrics. Furthermore, the
analysis there covers the case of acoustically radiating objects being enclosed
in the cloaked region.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:23:47 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Greenleaf",
"Allan",
""
],
[
"Kurylev",
"Yaroslav",
""
],
[
"Lassas",
"Matti",
""
],
[
"Uhlmann",
"Gunther",
""
]
] | [
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] |
801.328 | Cristina Buzea | Cristina Buzea, Ivan I. Pacheco, Kevin Robbie | Nanomaterials and nanoparticles: Sources and toxicity | State of the art review on nanoparticles and dust toxicity intended
for a wide audience. Comprehensible to non-specialists in medicine - contains
minidictionary of medical terminology; 41 Figures, 4 Tables, 103 pages, 345
references | Published in Biointerphases Vol. 2, issue 4 (2007) pages MR17 -
MR71 | null | null | physics.med-ph | null | This review is written with the goal of informing public health concerns
related to nanoscience, while raising awareness of nanomaterials toxicity among
scientists and manufacturers handling them. We show that humans have always
been exposed to nanoparticles and dust from natural sources and human
activities, the recent development of industry and combustion-based engine
transportation profoundly increasing anthropogenic nanoparticulate pollution.
The key to understanding the toxicity of nanoparticles is that their minute
size, smaller than cells and cellular organelles, allows them to penetrate
these basic biological structures, disrupting their normal function. Among
diseases associated with nanoparticles are asthma, bronchitis, lung cancer,
neurodegenerative diseases (such as Parkinson`s and Alzheimer`s diseases),
Crohn`s disease, colon cancer. Nanoparticles that enter the circulatory system
are related to occurrence of arteriosclerosis, and blood clots, arrhythmia,
heart diseases, and ultimately cardiac death. We show that possible adverse
effects of nanoparticles on human health depend on individual factors such as
genetics and existing disease, as well as exposure, and nanoparticle chemistry,
size, shape, and agglomeration state. The faster we will understand their
causes and mechanisms, the more likely we are to find cures for diseases
associated with nanoparticle exposure. We foresee a future with
better-informed, and hopefully more cautious manipulation of engineered
nanomaterials, as well as the development of laws and policies for safely
managing all aspects of nanomaterial manufacturing, industrial and commercial
use, and recycling.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 20:36:12 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Buzea",
"Cristina",
""
],
[
"Pacheco",
"Ivan I.",
""
],
[
"Robbie",
"Kevin",
""
]
] | [
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] |
801.3281 | Arunava Roy | Arunava Roy and Marco Cavaglia | Discriminating Supersymmetry and Black Holes at the Large Hadron
Collider | 12 pages, 8 figures | Phys.Rev.D77:064029,2008 | 10.1103/PhysRevD.77.064029 | null | hep-ph | null | We show how to differentiate the minimal supersymmetric extension of the
standard model from black hole events at the Large Hadron Collider. Black holes
are simulated with the CATFISH generator. Supersymmetry simulations use a
combination of PYTHIA and ISAJET. Our study, based on event shape variables,
visible and missing momenta, and analysis of dilepton events, demonstrates that
supersymmetry and black hole events at the LHC can be easily discriminated.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:22:10 GMT"
}
] | 2008-12-18T00:00:00 | [
[
"Roy",
"Arunava",
""
],
[
"Cavaglia",
"Marco",
""
]
] | [
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] |
801.3282 | Abilio Mateus | Abilio Mateus (1,2), Raul Jimenez (1), Enrique Gaztanaga (1) ((1) ICE,
Barcelona, Spain; (2) LAM, Marseille, France) | The scale dependence of mass assembly in galaxies | 4 pages, 4 figures, final version accepted for publication in ApJ
Letters | null | 10.1086/591732 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the results of the mark correlation analysis of galaxies in a
sample from the Sloan Digital Sky Survey and from two galaxy catalogs obtained
by semi-analytical galaxy formation models implemented on the Millennium
Simulation. We use the MOPED method to retrieve the star formation history of
observed galaxies and use star formation parameters as weights to the mark
correlations. We find an excellent match between models and observations when
the mark correlations use stellar mass and luminosity as weights. The most
remarkable result is related to the mark correlations associated to the
evolution of mass assembly through star formation in galaxies, where we find
that semi-analytical models are able to reproduce the main trends seen in the
observational data. In addition, we find a good agreement between the redshift
evolution of the mean total mass formed by star formation predicted by the
models and that measured by MOPED. Our results show that close galaxy pairs
today formed more stellar mass ~10 Gyr ago than the average, while more
recently this trend is the opposite, with close pairs showing low levels of
star formation activity. We also show a strong correlation in simulations
between the shape and time evolution of the star formation marks and the number
of major mergers experienced by galaxies, which drive the environmental
dependence in galaxy formation by regulating the star formation process.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:23:32 GMT"
},
{
"version": "v2",
"created": "Fri, 2 May 2008 04:51:55 GMT"
},
{
"version": "v3",
"created": "Thu, 10 Jul 2008 16:26:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mateus",
"Abilio",
""
],
[
"Jimenez",
"Raul",
""
],
[
"Gaztanaga",
"Enrique",
""
]
] | [
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801.3283 | Hamid Hezari | Hamid Hezari | Inverse Spectral Problem for Schr\"odinger Operators | 22 pages | null | 10.1007/s00220-008-0718-8 | null | math.SP | null | In this article we improve some of the inverse spectral results proved by
Guillemin and Uribe in \cite{GU}. They proved that under some symmetry
assumptions on the potential $V(x)$, the Taylor expansion of $V(x)$ near a
non-degenerate global minimum can be recovered from the knowledge of the
low-lying eigenvalues of the associated Schr\"odinger operator in $\mathbb
R^n$. We prove some similar inverse spectral results using fewer symmetry
assumptions. We also show that in dimension 1, no symmetry assumption is needed
to recover the Taylor coefficients of $V(x)$. We establish our results by
finding some explicit formulas for wave invariants at the bottom of the well.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:31:05 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 18:21:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hezari",
"Hamid",
""
]
] | [
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] |
801.3284 | Kenichi Konishi | Daniele Dorigoni, Kenichi Konishi, Keisuke Ohashi | Non-Abelian Vortices without Dynamical Abelianization | 22 pages, 4 figures, One section (Section 2) added, and an extended
discussion added in Section 5 | Phys.Rev.D79:045011,2009 | 10.1103/PhysRevD.79.045011 | IFUP-TH/2007-35, DAMTP-2008-4 | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vortices carrying truly non-Abelian flux moduli, which do not dynamically
reduce to Abelian vortices, are found in the context of softly-broken ${\cal
N}=2$ supersymmetric chromodynamics (SQCD). By tuning the bare quark masses
appropriately we identify the vacuum in which the underlying SU(N) gauge group
is partially broken to $SU(n) \times SU(r) \times U(1)/{\mathbbm Z}_{K}$, where
$K$ is the least common multiple of $(n, r)$, and with $N_{f}^{su(n)}=n$ and
$N_{f}^{su(r)}=r$ flavors of light quark multiplets. At much lower energies the
gauge group is broken completely by the squark VEVs, and vortices develop which
carry non-Abelian flux moduli $CP^{n-1}\times CP^{r-1}$. For $n>r$ we argue
that the SU(n) fluctuations become strongly coupled and Abelianize, while
leaving weakly fluctuating $SU(r)$ flux moduli. This allows us to recognize the
semi-classical origin of the light non-Abelian monopoles found earlier in the
fully quantum-mechanical treatment of 4D SQCD.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:35:44 GMT"
},
{
"version": "v2",
"created": "Wed, 11 Jun 2008 15:20:49 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Dorigoni",
"Daniele",
""
],
[
"Konishi",
"Kenichi",
""
],
[
"Ohashi",
"Keisuke",
""
]
] | [
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801.3285 | Debora Sijacki | D. Sijacki (1,2), C. Pfrommer (3), V. Springel (1), and T. A. Ensslin
(1) ((1) MPA Garching, (2) IoA Cambridge, (3) CITA Toronto) | Simulations of cosmic ray feedback by AGN in galaxy clusters | 15 pages, 7 figures, minor revisions, MNRAS accepted | null | 10.1111/j.1365-2966.2008.13310.x | null | astro-ph | null | We investigate a numerical model for AGN feedback where for the first time a
relativistic particle population in AGN-inflated bubbles is followed within a
full cosmological context. In our high-resolution simulations of galaxy cluster
formation, we assume that BH accretion is accompanied by energy feedback that
occurs in two different modes, depending on the accretion rate itself. Unlike
in previous work, we inject a non-thermal particle population of relativistic
protons into the AGN bubbles, instead of adopting a purely thermal heating. We
then follow the subsequent evolution of the cosmic ray (CR) plasma inside the
bubbles, considering both its hydrodynamical interactions and dissipation
processes relevant for the CR population. Due to the different buoyancy of
relativistic plasma and the comparatively long CR dissipation timescale we find
substantial changes in the evolution of clusters as a result of CR feedback. In
particular, the non-thermal population can provide significant pressure support
in central cluster regions at low thermal temperatures, providing a natural
explanation for the decreasing temperature profiles found in cool core
clusters. At the same time, the morphologies of the bubbles and of the induced
X-ray cavities show a striking similarity to observational findings. AGN
feedback with CRs also proves efficient in regulating cluster cooling flows so
that the total baryon fraction in stars becomes limited to realistic values of
the order of 10%. We find that the partial CR support of the intracluster gas
also affects the expected signal of the thermal Sunyaev-Zel'dovich effect, with
typical modifications of the integrated Compton-y parameter within the virial
radius of the order of 10%. [Abridged]
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:44:05 GMT"
},
{
"version": "v2",
"created": "Wed, 28 May 2008 14:51:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sijacki",
"D.",
"",
"MPA Garching",
"IoA Cambridge"
],
[
"Pfrommer",
"C.",
"",
"CITA Toronto"
],
[
"Springel",
"V.",
"",
"MPA Garching"
],
[
"Ensslin",
"T. A.",
"",
"MPA Garching"
]
] | [
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] |
801.3286 | Ariyeh Maller | Ariyeh H. Maller, Andreas A. Berlind, Michael R. Blanton and David W.
Hogg | The Intrinsic Properties of SDSS Galaxies | 11 pages, 12 figures submitted to ApJ | Astrophys.J.691:394-406,2009 | 10.1088/0004-637X/691/1/394 | null | astro-ph | null | The observed properties of galaxies vary with inclination; for most
applications we would rather have properties that are independent of
inclination, intrinsic properties. One way to determine inclination corrections
is to consider a large sample of galaxies, study how the observed properties of
these galaxies depend on inclination and then remove this dependence to recover
the intrinsic properties. We perform such an analysis for galaxies selected
from the Sloan Digital Sky Survey which have been matched to galaxies from the
Two-Micron All Sky Survey. We determine inclination corrections for these
galaxies as a function of galaxy luminosity and Sersic index. In the g-band
these corrections reach as as high as 1.2 mag and have a median value of 0.3
mag for all galaxies in our sample. We find that the corrections show little
dependence on galaxy luminosity, except in the $u$ band, but are strongly
dependent on galaxy Sersic index.
We find that the ratio of red-to-blue galaxies changes from 1:1 to 1:2 when
going from observed to intrinsic colors for galaxies in the range -22.75 < M_K
< -17.75. We also discuss how survey completeness and photometric redshifts
should be determined when taking into account that observed and intrinsic
properties differ. Finally, we examine whether previous determinations of
stellar mass give an intrinsic quantity or one that depends on galaxy
inclination.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 21:55:43 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Maller",
"Ariyeh H.",
""
],
[
"Berlind",
"Andreas A.",
""
],
[
"Blanton",
"Michael R.",
""
],
[
"Hogg",
"David W.",
""
]
] | [
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] |
801.3287 | Holger Weyer | Martin Reuter and Holger Weyer | Background Independence and Asymptotic Safety in Conformally Reduced
Gravity | 4 figures, | Phys.Rev.D79:105005,2009 | 10.1103/PhysRevD.79.105005 | MZ-TH/08-04 | hep-th gr-qc | null | We analyze the conceptual role of background independence in the application
of the effective average action to quantum gravity. Insisting on a background
independent renormalization group (RG) flow the coarse graining operation must
be defined in terms of an unspecified variable metric since no rigid metric of
a fixed background spacetime is available. This leads to an extra field
dependence in the functional RG equation and a significantly different RG flow
in comparison to the standard flow equation with a rigid metric in the mode
cutoff. The background independent RG flow can possess a non-Gaussian fixed
point, for instance, even though the corresponding standard one does not. We
demonstrate the importance of this universal, essentially kinematical effect by
computing the RG flow of Quantum Einstein Gravity in the ``conformally
reduced'' Einstein--Hilbert approximation which discards all degrees of freedom
contained in the metric except the conformal one. Without the extra field
dependence the resulting RG flow is that of a simple $\phi^4$-theory. Including
it one obtains a flow with exactly the same qualitative properties as in the
full Einstein--Hilbert truncation. In particular it possesses the non-Gaussian
fixed point which is necessary for asymptotic safety.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 22:01:52 GMT"
}
] | 2009-10-29T00:00:00 | [
[
"Reuter",
"Martin",
""
],
[
"Weyer",
"Holger",
""
]
] | [
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] |
801.3288 | Jan-Uwe Ness | J.U-. Ness, G. Schwarz, S. Starrfield, J.P. Osborne, K.L. Page, A.P.
Beardmore, R.M. Wagner, C.E. Woodward | V723 Cassiopeia still on in X-rays: A bright Super Soft Source 12 years
after outburst | Accepted by AJ; 7 pages, 5 figures, 2 tables | null | null | null | astro-ph | null | We find that the classical nova V723 Cas (1995) is still an active X-ray
source more than 12 years after outburst and analyze seven X-ray observations
carried out with Swift between 2006 January 31 and 2007 December 3. The average
count rate is 0.022+/-0.01 cts s^-1 but the source is variable within a factor
of two of the mean and does not show any signs of turning off. We present
supporting optical observations which show that between 2001 and 2006 an
underlying hot source was present with steadily increasing temperature. In
order to confirm that the X-ray emission is from V723 Cas, we extract a ROSAT
observation taken in 1990 and find that there was no X-ray source at the
position of the nova. The Swift XRT spectra resemble those of the Super Soft
X-ray binary Sources (SSS) which is confirmed by RXTE survey data which show no
X-ray emission above 2 keV between 1996 and 2007. Using blackbody fits we
constrain the effective temperature to between T_eff=(2.8-3.8)x10^5 K and a
bolometric luminosity >5x10^36 erg s^-1 and caution that luminosities from
blackbodies are generally overestimated and temperatures underestimated. We
discuss a number of possible explanations for the continuing X-ray activity,
including the intriguing possibility of steady hydrogen burning due to renewed
accretion.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 22:42:55 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 16:52:57 GMT"
}
] | 2008-02-05T00:00:00 | [
[
"Ness",
"J. U-.",
""
],
[
"Schwarz",
"G.",
""
],
[
"Starrfield",
"S.",
""
],
[
"Osborne",
"J. P.",
""
],
[
"Page",
"K. L.",
""
],
[
"Beardmore",
"A. P.",
""
],
[
"Wagner",
"R. M.",
""
],
[
"Woodward",
"C. E.",
""
]
] | [
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] |
801.3289 | Lifeng Lai | Lifeng Lai, Hesham El Gamal, Hai Jiang and H. Vincent Poor | Optimal Medium Access Control in Cognitive Radios: A Sequential Design
Approach | To appear in the Proceedings of the 2008 IEEE International
Conference on Acoustics, Speech and Signal Processing, Las Vegas, NV, March
30- April 4, 2008 | null | 10.1109/ICASSP.2008.4518049 | null | cs.IT cs.NI math.IT | null | The design of medium access control protocols for a cognitive user wishing to
opportunistically exploit frequency bands within parts of the radio spectrum
having multiple bands is considered. In the scenario under consideration, the
availability probability of each channel is unknown a priori to the cognitive
user. Hence efficient medium access strategies must strike a balance between
exploring the availability of channels and exploiting the opportunities
identified thus far. Using a sequential design approach, an optimal medium
access strategy is derived. To avoid the prohibitive computational complexity
of this optimal strategy, a low complexity asymptotically optimal strategy is
also developed. The proposed strategy does not require any prior statistical
knowledge about the traffic pattern on the different channels.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 22:45:28 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Lai",
"Lifeng",
""
],
[
"Gamal",
"Hesham El",
""
],
[
"Jiang",
"Hai",
""
],
[
"Poor",
"H. Vincent",
""
]
] | [
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801.329 | Todd Kaplan | Todd D. Kaplan and Stephanie Forrest | A dual assortative measure of community structure | null | null | null | null | physics.data-an physics.soc-ph | null | Current community detection algorithms operate by optimizing a statistic
called modularity, which analyzes the distribution of positively weighted edges
in a network. Modularity does not account for negatively weighted edges. This
paper introduces a dual assortative modularity measure (DAMM) that incorporates
both positively and negatively weighted edges. We describe the the DAMM
statistic and illustrate its utility in a community detection algorithm. We
evaluate the efficacy of the algorithm on both computer generated and
real-world networks, showing that DAMM broadens the domain of networks that can
be analyzed by community detection algorithms.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 22:53:32 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Kaplan",
"Todd D.",
""
],
[
"Forrest",
"Stephanie",
""
]
] | [
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801.3291 | Xiao-Gang Wen | Xiao-Gang Wen and Zhenghan Wang | A classification of symmetric polynomials of infinite variables -- a
construction of Abelian and non-Abelian quantum Hall states | 21 pages, RevTeX4 | Phys. Rev. B 77, 235108 (2008) | 10.1103/PhysRevB.77.235108 | null | cond-mat.str-el cond-mat.mes-hall math-ph math.MP | null | Classification of complex wave functions of infinite variables is an
important problem since it is related to the classification of possible quantum
states of matter. In this paper, we propose a way to classify symmetric
polynomials of infinite variables using the pattern of zeros of the
polynomials. Such a classification leads to a construction of a class of simple
non-Abelian quantum Hall states which are closely related to parafermion
conformal field theories.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 23:21:15 GMT"
},
{
"version": "v2",
"created": "Fri, 2 May 2008 22:56:59 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wen",
"Xiao-Gang",
""
],
[
"Wang",
"Zhenghan",
""
]
] | [
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] |
801.3292 | Alexander Hariton | A. M. Grundland, A. J. Hariton | Supersymmetric version of a hydrodynamic system in Riemann invariants
and its solutions | 30 pages | J.Math.Phys.49:043502,2008 | 10.1063/1.2898094 | null | math-ph math.MP | null | In this paper, a supersymmetric extension of a system of hydrodynamic type
equations involving Riemann invariants is formulated in terms of a superspace
and superfield formalism. The symmetry properties of both the classical and
supersymmetric versions of this hydrodynamical model are analyzed through the
use of group-theoretical methods applied to partial differential equations
involving both bosonic and fermionic variables. More specifically, we compute
the Lie superalgebras of both models and perform classifications of their
respective subalgebras. A systematic use of the subalgebra structures allow us
to construct several classes of invariant solutions, including travelling
waves, centered waves and solutions involving monomials, exponentials and
radicals.
| [
{
"version": "v1",
"created": "Mon, 21 Jan 2008 23:21:52 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Grundland",
"A. M.",
""
],
[
"Hariton",
"A. J.",
""
]
] | [
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] |
801.3293 | Daniel Price | Daniel Price (U. Exeter), Matthew Bate (U. Exeter) | The effect of magnetic fields on star cluster formation | 16 pages, 9 figures, 8 very pretty movies, MNRAS, accepted. Version
with high-res figures + movies available from
http://www.astro.ex.ac.uk/people/dprice/pubs/mcluster/index.html | null | 10.1111/j.1365-2966.2008.12976.x | null | astro-ph | null | We examine the effect of magnetic fields on star cluster formation by
performing simulations following the self-gravitating collapse of a turbulent
molecular cloud to form stars in ideal MHD. The collapse of the cloud is
computed for global mass-to-flux ratios of infinity, 20, 10, 5 and 3, that is
using both weak and strong magnetic fields. Whilst even at very low strengths
the magnetic field is able to significantly influence the star formation
process, for magnetic fields with plasma beta < 1 the results are substantially
different to the hydrodynamic case. In these cases we find large-scale
magnetically-supported voids imprinted in the cloud structure; anisotropic
turbulent motions and column density structure aligned with the magnetic field
lines, both of which have recently been observed in the Taurus molecular cloud.
We also find strongly suppressed accretion in the magnetised runs, leading to
up to a 75% reduction in the amount of mass converted into stars over the
course of the calculations and a more quiescent mode of star formation. There
is also some indication that the relative formation efficiency of brown dwarfs
is lower in the strongly magnetised runs due to the reduction in the importance
of protostellar ejections.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 00:08:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Price",
"Daniel",
"",
"U. Exeter"
],
[
"Bate",
"Matthew",
"",
"U. Exeter"
]
] | [
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] |
801.3294 | Ian F. Putnam | Ian F. Putnam | A homology theory for Smale spaces: a summary | Research summary; complete version in preparation. The new version
gives a substantially simplified and more natural definition | null | null | null | math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Smale spaces, a particular class of hyperbolic topological
dynamical systems, which include the basic sets for Smale's Axiom A systems. We
present a homology theory for such systems which is based on the dimension
group in the special case of shifts of finite type. This theory provides a
Lefschetz formula relating trace data with the number of periodic points of the
system.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 00:46:52 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Nov 2008 00:05:46 GMT"
}
] | 2008-11-20T00:00:00 | [
[
"Putnam",
"Ian F.",
""
]
] | [
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] |
801.3295 | Eugene Lim | Xingang Chen, Richard Easther, Eugene A. Lim | Generation and Characterization of Large Non-Gaussianities in Single
Field Inflation | 29 pp, 8 figs | JCAP 0804:010,2008 | 10.1088/1475-7516/2008/04/010 | null | astro-ph hep-th | null | Inflation driven by a single, minimally coupled, slowly rolling field
generically yields a negligible primordial non-Gaussianity. We discuss two
distinct mechanisms by which a non-trivial potential can generate large
non-Gaussianities. Firstly, if the inflaton traverses a feature in the
potential, or if the inflationary phase is short enough so that initial
transient contributions to the background dynamics have not been erased, modes
near horizon-crossing can acquire significant non-Gaussianities. Secondly,
potentials with small-scale structure may induce significant non-Gaussianities
while the relevant modes are deep inside the horizon. The first case includes
the "step" potential we previously analyzed while the second "resonance" case
is novel. We derive analytic approximations for the 3-point terms generated by
both mechanisms written as products of functions of the three individual
momenta, permitting the use of efficient analysis algorithms. Finally, we
present a significantly improved approach to regularizing and numerically
evaluating the integrals that contribute to the 3-point function.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 01:13:52 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Feb 2008 20:13:38 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Chen",
"Xingang",
""
],
[
"Easther",
"Richard",
""
],
[
"Lim",
"Eugene A.",
""
]
] | [
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] |
801.3296 | Nitu Kitchloo | Ralph L. Cohen, Soren Galatius, Nitu Kitchloo | Universal moduli spaces of surfaces with flat connections and cobordism
theory | 22 pages | null | null | null | math.AT math.GT | null | Given a semisimple, compact, connected Lie group G with complexification G^c,
we show there is a stable range in the homotopy type of the universal moduli
space of flat connections on a principal G-bundle on a closed Riemann surface,
and equivalently, the universal moduli space of semistable holomorphic
G^c-bundles. The stable range depends on the genus of the surface. We then
identify the homology of this moduli space in the stable range in terms of the
homology of an explicit infinite loop space. Rationally this says that the
stable cohomology of this moduli space is generated by the
Mumford-Morita-Miller kappa-classes, and the ring of characteristic classes of
principal G-bundles, H^*(BG). We then identify the homotopy type of the
category of one-manifolds and surface cobordisms, each equipped with a flat
G-bundle. We also explain how these results may be generalized to arbitrary
compact connected Lie groups. Our methods combine the classical techniques of
Atiyah and Bott, with the new techniques coming out of Madsen and Weiss's proof
of Mumford's conjecture on the stable cohomology of the moduli space of Riemann
surfaces.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 02:39:55 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Cohen",
"Ralph L.",
""
],
[
"Galatius",
"Soren",
""
],
[
"Kitchloo",
"Nitu",
""
]
] | [
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] |
801.3297 | Ben Dilday | Benjamin Dilday, R. Kessler, J. A. Frieman, J. Holtzman, J. Marriner,
G. Miknaitis, R. C. Nichol, R. Romani, M. Sako, B. Bassett, A. Becker, D.
Cinabro, F. DeJongh, D. L. Depoy, M. Doi, P. M. Garnavich, C. J. Hogan, S.
Jha, K. Konishi, H. Lampeitl, J. L. Marshall, D. McGinnis, J. L. Prieto, A.
G. Riess, M. W. Richmond, D. P. Schneider, M. Smith, N. Takanashi, K. Tokita,
K. van der Heyden, N. Yasuda, C. Zheng, J. Barentine, H. Brewington, C. Choi,
A. Crotts, J. Dembicky, M. Harvanek, M. Im, W. Ketzeback, S. J. Kleinman, J.
Krzesi\'nski, D. C. Long, E. Malanushenko, V. Malanushenko, R. J. McMillan,
A. Nitta, K. Pan, G. Saurage, S. A. Snedden, S. Watters, J. C. Wheeler, and
D. York | A Measurement of the Rate of type-Ia Supernovae at Redshift $z\approx$
0.1 from the First Season of the SDSS-II Supernova Survey | 65 pages, 12 figures | Astrophys.J.682:262-282,2008 | 10.1086/587733 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a measurement of the rate of type Ia supernovae (SNe Ia) from the
first of three seasons of data from the SDSS-II Supernova Survey. For this
measurement, we include 17 SNe Ia at redshift $z\le0.12$. Assuming a flat
cosmology with $\Omega_m = 0.3=1-\Omega_\Lambda$, we find a volumetric SN Ia
rate of $[2.93^{+0.17}_{-0.04}({\rm systematic})^{+0.90}_{-0.71}({\rm
statistical})] \times 10^{-5} {\rm SNe} {\rm Mpc}^{-3} h_{70}^3 {\rm
year}^{-1}$, at a volume-weighted mean redshift of 0.09. This result is
consistent with previous measurements of the SN Ia rate in a similar redshift
range. The systematic errors are well controlled, resulting in the most precise
measurement of the SN Ia rate in this redshift range. We use a maximum
likelihood method to fit SN rate models to the SDSS-II Supernova Survey data in
combination with other rate measurements, thereby constraining models for the
redshift-evolution of the SN Ia rate. Fitting the combined data to a simple
power-law evolution of the volumetric SN Ia rate, $r_V \propto (1+z)^{\beta}$,
we obtain a value of $\beta = 1.5 \pm 0.6$, i.e. the SN Ia rate is determined
to be an increasing function of redshift at the $\sim 2.5 \sigma$ level.
Fitting the results to a model in which the volumetric SN rate,
$r_V=A\rho(t)+B\dot \rho(t)$, where $\rho(t)$ is the stellar mass density and
$\dot \rho(t)$ is the star formation rate, we find $A = (2.8 \pm 1.2) \times
10^{-14} \mathrm{SNe} \mathrm{M}_{\sun}^{-1} \mathrm{year}^{-1}$, $B =
(9.3^{+3.4}_{-3.1})\times 10^{-4} \mathrm{SNe} \mathrm{M}_{\sun}^{-1}$.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 15:15:27 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 19:54:27 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Jul 2008 13:18:17 GMT"
}
] | 2010-11-05T00:00:00 | [
[
"Dilday",
"Benjamin",
""
],
[
"Kessler",
"R.",
""
],
[
"Frieman",
"J. A.",
""
],
[
"Holtzman",
"J.",
""
],
[
"Marriner",
"J.",
""
],
[
"Miknaitis",
"G.",
""
],
[
"Nichol",
"R. C.",
""
],
[
"Romani",
"R.",
""
],
[
"Sako",
"M.",
""
],
[
"Bassett",
"B.",
""
],
[
"Becker",
"A.",
""
],
[
"Cinabro",
"D.",
""
],
[
"DeJongh",
"F.",
""
],
[
"Depoy",
"D. L.",
""
],
[
"Doi",
"M.",
""
],
[
"Garnavich",
"P. M.",
""
],
[
"Hogan",
"C. J.",
""
],
[
"Jha",
"S.",
""
],
[
"Konishi",
"K.",
""
],
[
"Lampeitl",
"H.",
""
],
[
"Marshall",
"J. L.",
""
],
[
"McGinnis",
"D.",
""
],
[
"Prieto",
"J. L.",
""
],
[
"Riess",
"A. G.",
""
],
[
"Richmond",
"M. W.",
""
],
[
"Schneider",
"D. P.",
""
],
[
"Smith",
"M.",
""
],
[
"Takanashi",
"N.",
""
],
[
"Tokita",
"K.",
""
],
[
"van der Heyden",
"K.",
""
],
[
"Yasuda",
"N.",
""
],
[
"Zheng",
"C.",
""
],
[
"Barentine",
"J.",
""
],
[
"Brewington",
"H.",
""
],
[
"Choi",
"C.",
""
],
[
"Crotts",
"A.",
""
],
[
"Dembicky",
"J.",
""
],
[
"Harvanek",
"M.",
""
],
[
"Im",
"M.",
""
],
[
"Ketzeback",
"W.",
""
],
[
"Kleinman",
"S. J.",
""
],
[
"Krzesiński",
"J.",
""
],
[
"Long",
"D. C.",
""
],
[
"Malanushenko",
"E.",
""
],
[
"Malanushenko",
"V.",
""
],
[
"McMillan",
"R. J.",
""
],
[
"Nitta",
"A.",
""
],
[
"Pan",
"K.",
""
],
[
"Saurage",
"G.",
""
],
[
"Snedden",
"S. A.",
""
],
[
"Watters",
"S.",
""
],
[
"Wheeler",
"J. C.",
""
],
[
"York",
"D.",
""
]
] | [
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] |
801.3298 | Zhiming Wang | Zhiming Wang, Feng Xu, Chao Lu, He Zhang, Qingyu Xu, Jinan Zhu
(Institute of Mechanical Engineering, Nanjing University of science and
technology, Nanjing, China) | Electronic Conductivity Upturn of HOPG Contrast to Transport Properties
of Polycrystal Graphite | 11 pages 5 figures | null | null | null | cond-mat.mtrl-sci cond-mat.other | null | The transport properties of highly oriented pyrolitic graphite (HOPG) and
polycrystal graphite have been studied. The electric conductivity of HOPG is
several times larger than that of the polycrystal graphite. Along with the
large magnetoresistances (MR), the polycrystal graphite show the accordant
semiconductor-like character in a wide temperature (roughly range from 20K to
120K) under 0, 4, 8, 12 T applied magnetic field, while the
magnetic-field-induced metal-semiconductor-like transition was only found in
HOPG. The difference of transport properties originates from the Coulomb
interaction quasipartical in HOPG graphite layers in contrast with the grain
boundary scattering in the polycrystal graphite.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 02:20:37 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Wang",
"Zhiming",
"",
"Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China"
],
[
"Xu",
"Feng",
"",
"Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China"
],
[
"Lu",
"Chao",
"",
"Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China"
],
[
"Zhang",
"He",
"",
"Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China"
],
[
"Xu",
"Qingyu",
"",
"Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China"
],
[
"Zhu",
"Jinan",
"",
"Institute of Mechanical Engineering, Nanjing University of science and\n technology, Nanjing, China"
]
] | [
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] |
801.3299 | Stephen D. Miller | Stephen D. Miller | A method for computing general automorphic forms on general groups | v1:6 pages v2:updates to mention recent computational work by other
researchers v3:7 pages, updates and adds some comments and references | null | null | null | math.NT math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article describes a general method for computing automorphic forms using
Voronoi-type summation formulas. It gives a numerical example where the
technique is successful in quickly finding a cusp form on GL(3,Z)\GL(3,R),
albeit one whose existence was already known as a Langlands lift.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 02:51:59 GMT"
},
{
"version": "v2",
"created": "Wed, 4 Jun 2008 20:04:54 GMT"
},
{
"version": "v3",
"created": "Thu, 23 Jul 2009 18:05:16 GMT"
}
] | 2009-07-23T00:00:00 | [
[
"Miller",
"Stephen D.",
""
]
] | [
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] |
801.33 | Sang Pyo Kim | Sang Pyo Kim (Kunsan Nat'l Univ.) | Strong Scalar QED in Inhomogeneous Electromagnetic Fields | RevTex 8 pages, no figure; to appear in the Proceedings of the 10th
Italian-Korean Symposium on Relativistic Astrophysics, Pescara, Italy, June
25-30, 2007; pair production rate and mean number of pairs clarified in the
strong electric field limit and references added | null | null | null | hep-th | null | Strong QED has attracted attention recently partly because many astrophysical
phenomena have been observed to involve electromagnetic fields beyond the
critical strength for electron-positron pair production and partly because
terrestrial experiments will generate electromagnetic fields above or near the
critical strength in the near future. In this talk we critically review QED
phenomena involving strong external electromagnetic fields. Strong QED is
characterized by vacuum polarization due to quantum fluctuations and pair
production due to the vacuum instability. A canonical method is elaborated for
pair production at zero or finite temperature by inhomogeneous electric fields.
An algorithm is advanced to calculate pair production rate for electric fields
acting for finite periods of time or localized in space or oscillating electric
fields. Finally, strong QED is discussed in astrophysics, in particular,
strange stars.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 02:54:34 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 18:01:55 GMT"
}
] | 2008-02-06T00:00:00 | [
[
"Kim",
"Sang Pyo",
"",
"Kunsan Nat'l Univ."
]
] | [
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] |
801.3301 | Yoshio Koide | Naoyuki Haba and Yoshio Koide | F-term Induced Flavor Mass Spectrum | 12 pages, no figure | JHEP 0806:023,2008 | 10.1088/1126-6708/2008/06/023 | OU-HET 596/2008 | hep-ph | null | New mechanism of generating flavor mass spectrum is proposed by using an
O'Raifeartaigh-type supersymmetry breaking model. A desired bilinear form of
fermion mass spectrum is naturally realized through F-components of
gauge-singlet (nonet of SU(3) flavor symmetry) superfields, and the suitable
charged-lepton mass relation is reproduced. The charged-slepton mass spectrum
is non-degenerate in general, and can be even hierarchical (proportional to the
charged-lepton masses in the specific case). Flavor changing neutral processes
are suppressed since the charged-lepton and slepton (except for right-handed
sneutrino) mass matrices are diagonalized simultaneously in the flavor space.
The right-handed sneutrinos are light with the similar ratio to the lepton
sector ($\tilde{m}_{\nu_R}$/$\tilde{m}_e \sim m_\nu$/$m_e$).
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 05:07:17 GMT"
}
] | 2009-01-06T00:00:00 | [
[
"Haba",
"Naoyuki",
""
],
[
"Koide",
"Yoshio",
""
]
] | [
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] |
801.3302 | Farhan Rana | Jahan M. Dawlaty, Shriram Shivaraman, Jared Strait, Paul George, Mvs
Chandrashekhar, Farhan Rana, Michael G. Spencer, Dmitry Veksler, Yunqing Chen | Measurement of the Optical Absorption Spectra of Epitaxial Graphene from
Terahertz to Visible | null | null | 10.1063/1.2990753 | null | cond-mat.mtrl-sci cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present experimental results on the optical absorption spectra of
epitaxial graphene from the visible to the terahertz (THz) frequency range. In
the THz range, the absorption is dominated by intraband processes with a
frequency dependence similar to the Drude model. In the near IR range, the
absorption is due to interband processes and the measured optical conductivity
is close to the theoretical value of $e^{2}/4\hbar$. We extract values for the
carrier densities, the number of carbon atom layers, and the intraband
scattering times from the measurements.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 20:35:54 GMT"
},
{
"version": "v2",
"created": "Sun, 27 Jan 2008 05:18:07 GMT"
},
{
"version": "v3",
"created": "Sat, 16 Aug 2008 11:43:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dawlaty",
"Jahan M.",
""
],
[
"Shivaraman",
"Shriram",
""
],
[
"Strait",
"Jared",
""
],
[
"George",
"Paul",
""
],
[
"Chandrashekhar",
"Mvs",
""
],
[
"Rana",
"Farhan",
""
],
[
"Spencer",
"Michael G.",
""
],
[
"Veksler",
"Dmitry",
""
],
[
"Chen",
"Yunqing",
""
]
] | [
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] |
801.3303 | Yanfei Jiang | Yu-Qing Lou, Yan-Fei Jiang, Chi-Chuan Jin | Self-Similar Shocks and Winds in Galaxy Clusters | 26 pages, 20 figures | null | 10.1111/j.1365-2966.2008.12999.x | null | astro-ph | null | A theoretical model framework of spherical symmetry is presented for a
composite astrophysical system of two polytropic fluids coupled together by
gravity to explore large-scale shocks and flow dynamics in clusters of galaxies
or in globular clusters. The existence of such large-scale shocks in clusters
of galaxies as inferred by high-resolution X-ray and radio imaging observations
implies large-scale systematic flows that are beyond usual static models for
clusters of galaxies. Here, we explore self-similar two-fluid flow solutions
with shocks for a hot polytropic gas flow in a cluster of galaxies in the
presence of a massive dark matter (DM) flow after the initiation of a
gravitational core collapse or a central AGN activity or a large-scale merging
process. In particular, the possibility of DM shocks or sharp jumps of mass
density and of velocity dispersion in dark matter halo is discussed and such DM
shocks might be detectable through gravitational lensing effects. To examine
various plausible scenarios for clusters of galaxies, we describe three
possible classes of shock flows within our model framework for different types
of temperature, density and flow speed profiles. Depending upon sensible model
parameters and shock locations, the hot ICM and DM halo may have various
combinations of asymptotic behaviours of outflow, breeze, inflow, contraction
or static envelopes at large radii at a given time. We refer to asymptotic
outflows of hot ICM at large radii as the galaxy cluster wind. As a result of
such galaxy cluster winds and simultaneous contractions of DM halo during the
course of galaxy cluster evolution, there would be less hot ICM within clusters
of galaxies as compared to the average baryon fraction in the Universe.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 04:23:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lou",
"Yu-Qing",
""
],
[
"Jiang",
"Yan-Fei",
""
],
[
"Jin",
"Chi-Chuan",
""
]
] | [
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] |
801.3304 | Rebecca McFadden | R. A. McFadden, N. D. R. Bhat, R. D. Ekers, C. W. James, D. Jones, S.
J. Tingay, P. P. Roberts, C. J. Phillips, R. J. Protheroe | Developments in Nanosecond Pulse Detection Methods and Technology | 4 pages, 1 figure, Proceedings from 30th ICRC, Merida, Mexico, 2007 | null | null | null | astro-ph | null | A promising method for the detection of UHE neutrinos is the Lunar Cherenkov
technique, which utilises Earth-based radio telescopes to detect the coherent
Cherenkov radiation emitted when a UHE neutrino interacts in the outer layers
of the Moon. The LUNASKA project aims to overcome the technological limitations
of past experiments to utilise the next generation of radio telescopes in the
search for these elusive particles. To take advantage of broad-bandwidth data
from potentially thousands of antennas requires advances in signal processing
technology. Here we describe recent developments in this field and their
application in the search for UHE neutrinos, from a preliminary experiment
using the first stage of an upgrade to the Australia Telescope Compact Array,
to possibilities for fully utilising the completed Square Kilometre Array. We
also explore a new real time technique for characterising ionospheric pulse
dispersion which specifically measures ionospheric electron content that is
line of sight to the moon.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 04:24:19 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"McFadden",
"R. A.",
""
],
[
"Bhat",
"N. D. R.",
""
],
[
"Ekers",
"R. D.",
""
],
[
"James",
"C. W.",
""
],
[
"Jones",
"D.",
""
],
[
"Tingay",
"S. J.",
""
],
[
"Roberts",
"P. P.",
""
],
[
"Phillips",
"C. J.",
""
],
[
"Protheroe",
"R. J.",
""
]
] | [
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] |
801.3305 | Masahiro Machida N | Masahiro N. Machida, Eiichiro Kokubo, Shu-ichiro Inutsuka, Tomoaki
Matsumoto | Angular Momentum Accretion onto a Gas Giant Planet | 39 pages,13 figures, Submitted to ApJ, For high resolution figures
see http://www2.scphys.kyoto-u.ac.jp/~machidam/jupiter2/ms08jan22.pdf | null | 10.1086/590421 | null | astro-ph | null | We investigate the accretion of angular momentum onto a protoplanet system
using three-dimensional hydrodynamical simulations. We consider a local region
around a protoplanet in a protoplanetary disk with sufficient spatial
resolution. We describe the structure of the gas flow onto and around the
protoplanet in detail. We find that the gas flows onto the protoplanet system
in the vertical direction crossing the shock front near the Hill radius of the
protoplanet, which is qualitatively different from the picture established by
two-dimensional simulations. The specific angular momentum of the gas accreted
by the protoplanet system increases with the protoplanet mass. At Jovian orbit,
when the protoplanet mass M_p is M_p < 1 M_J, where M_J is Jovian mass, the
specific angular momentum increases as j \propto M_p. On the other hand, it
increases as j \propto M_p^2/3 when the protoplanet mass is M_p > 1 M_J. The
stronger dependence of the specific angular momentum on the protoplanet mass
for M_p < 1 M_J is due to thermal pressure of the gas. The estimated total
angular momentum of a system of a gas giant planet and a circumplanetary disk
is two-orders of magnitude larger than those of the present gas giant planets
in the solar system. A large fraction of the total angular momentum contributes
to the formation of the circumplanetary disk. We also discuss the satellite
formation from the circumplanetary disk.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 04:24:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Machida",
"Masahiro N.",
""
],
[
"Kokubo",
"Eiichiro",
""
],
[
"Inutsuka",
"Shu-ichiro",
""
],
[
"Matsumoto",
"Tomoaki",
""
]
] | [
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] |
801.3306 | Lionel Levine | Alexander E. Holroyd, Lionel Levine, Karola Meszaros, Yuval Peres,
James Propp, David B. Wilson | Chip-Firing and Rotor-Routing on Directed Graphs | 34 pages, 11 figures. v2 has additional references, v3 corrects
figure 9, v4 corrects several typos | In and Out of Equilibrium 2, "Progress in Probability'' vol. 60,
pages 331--364 (2008) | 10.1007/978-3-7643-8786-0_17 | null | math.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a rigorous and self-contained survey of the abelian sandpile model
and rotor-router model on finite directed graphs, highlighting the connections
between them. We present several intriguing open problems.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 18:08:35 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Feb 2008 23:19:42 GMT"
},
{
"version": "v3",
"created": "Fri, 18 Apr 2008 13:23:44 GMT"
},
{
"version": "v4",
"created": "Thu, 20 Jun 2013 13:11:54 GMT"
}
] | 2015-03-13T00:00:00 | [
[
"Holroyd",
"Alexander E.",
""
],
[
"Levine",
"Lionel",
""
],
[
"Meszaros",
"Karola",
""
],
[
"Peres",
"Yuval",
""
],
[
"Propp",
"James",
""
],
[
"Wilson",
"David B.",
""
]
] | [
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] |
801.3307 | Shunji Tsuchiya | Shunji Tsuchiya, Franco Dalfovo, Lev P. Pitaevskii | Solitons in two-dimensional Bose-Einstein condensates | 4 pages, 4 figures, published version | Phys. Rev. A 77, 045601 (2008) | 10.1103/PhysRevA.77.045601 | null | cond-mat.supr-con cond-mat.other | null | The excitations of a two-dimensional (2D) Bose-Einstein condensate in the
presence of a soliton are studied by solving the Kadomtsev-Petviashvili
equation which is valid when the velocity of the soliton approaches the speed
of sound. The excitation spectrum is found to contain states which are
localized near the soliton and have a dispersion law similar to the one of the
stable branch of transverse oscillations of a 1D gray soliton in a 2D
condensate. By using the stabilization method we show that these localized
excitations behave as resonant states coupled to the continuum of free
excitations of the condensate.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 05:15:06 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Mar 2008 05:03:01 GMT"
},
{
"version": "v3",
"created": "Fri, 4 Apr 2008 07:52:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tsuchiya",
"Shunji",
""
],
[
"Dalfovo",
"Franco",
""
],
[
"Pitaevskii",
"Lev P.",
""
]
] | [
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] |
801.3308 | Alok Shukla | Priya Sony and Alok Shukla | Ab initio Wannier-function-based correlated calculations of Born
effective charges of crystalline Li$_{2}$O and LiCl | 11 pages, 1 figure. To appear in Phys. Rev. B (Feb 2008) | Phys. Rev. B 77, 075130 (2008). | 10.1103/PhysRevB.77.075130 | null | cond-mat.mtrl-sci | null | In this paper we have used our recently developed ab initio
Wannier-function-based methodology to perform extensive Hartree-Fock and
correlated calculations on Li$_{2}$O and LiCl to compute their Born effective
charges. Results thus obtained are in very good agreement with the experiments.
In particular, for the case of Li$_{2}$O, we resolve a controversy originating
in the experiment of Osaka and Shindo {[}Solid State Commun. 51 (1984) 421] who
had predicted the effective charge of Li ions to be in the range 0.58--0.61, a
value much smaller compared to its nominal value of unity, thereby, suggesting
that the bonding in the material could be partially covalent. We demonstrate
that effective charge computed by Osaka and Shindo is the Szigeti charge, and
once the Born charge is computed, it is in excellent agreement with our
computed value. Mulliken population analysis of Li$_{2}$O also confirms ionic
nature of the bonding in the substance.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 05:56:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sony",
"Priya",
""
],
[
"Shukla",
"Alok",
""
]
] | [
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] |
801.3309 | Li Yu | Yu Guo, Li Yu | Surgery on links with unknotted components and three-manifolds | 10 pages, 8 figures | Journal of Knot Theory and Its Ramifications, Vol. 19, No. 12
(2010) 1645--1653 | null | null | math.GT | null | It is shown that any closed three-manifold M obtained by integral surgery on
a knot in the three-sphere can always be constructed from integral surgeries on
a 3-component link L with each component being an unknot in the three-sphere.
It is also interesting to notice that infinitely many different integral
surgeries on the same link L could give the same three-manifold M.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 06:00:11 GMT"
}
] | 2011-01-25T00:00:00 | [
[
"Guo",
"Yu",
""
],
[
"Yu",
"Li",
""
]
] | [
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] |
801.331 | Tatiana Hessami Pilehrood | Kh. Hessami Pilehrood, T. Hessami Pilehrood | Simultaneous generation for zeta values by the Markov-WZ method | 7 pages | Discrete Math. Theor. Comput. Sci. 10 (2008), no. 3, 115-123 | null | null | math.CO math.NT | null | By application of the Markov-WZ method, we prove a more general form of a
bivariate generating function identity containing, as particular cases,
Koecher's and Almkvist-Granville's Ap\'ery-like formulae for odd zeta values.
As a consequence, we get a new identity producing Ap\'ery-like series for all
$\zeta(2n+4m+3),$ $n,m\ge 0,$ convergent at the geometric rate with ratio
$2^{-10}.$
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 06:10:44 GMT"
}
] | 2013-12-31T00:00:00 | [
[
"Pilehrood",
"Kh. Hessami",
""
],
[
"Pilehrood",
"T. Hessami",
""
]
] | [
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] |
801.3311 | Alex T. Granik | Alex Granik | Straightforward Derivation of the Schr{\"o}dinger Equation from
Classical Mechanics and the Planck Postulate | 18 pages, 2 appendices, the title is changed, introduction and
conclusions are revised for making more clear the purpose and the results of
the paper | null | null | null | quant-ph | null | According to the widely accepted notion, the Schr{\"o}dinger equation (SE) is
not derivable in principle. Contrary to this belief, we present here a
straightforward derivation of SE. It is based on only two fundamentals of
mechanics: the classical Hamilton-Jacobi equation(HJE) and the Planck postulate
about the discrete transfer of energy at micro-scales. Our approach is
drastically different from the other published derivations of SE which either
employ an ad hoc underlying assumption about the probabilistic or the
statistical nature of the micro-scale phenomena, or rely on the prior knowledge
of SE and arrive at it by introducing a new postulate - neither present in
classical mechanics nor following from experiments - with a suitable but
physically unjustifiable choice of a key arbitrary constant.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 06:48:27 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 09:19:41 GMT"
},
{
"version": "v3",
"created": "Wed, 16 Apr 2008 06:33:00 GMT"
}
] | 2008-04-16T00:00:00 | [
[
"Granik",
"Alex",
""
]
] | [
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-0.1454270184,
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] |
801.3312 | Cory Dean | C.R. Dean, B.A. Piot, P. Hayden, S. Das Sarma, G. Gervais, L.N.
Pfeiffer, and K.W. West | Intrinsic Gap of the nu=5/2 Fractional Quantum Hall State | 5 pages, 4 figures; typo corrected, comment expanded | Phys. Rev. Lett. 100, 146803 (2008) | 10.1103/PhysRevLett.100.146803 | null | cond-mat.mes-hall | null | The fractional quantum Hall effect is observed at low field, in a regime
where the cyclotron energy is smaller than the Coulomb interaction. The nu=5/2
excitation gap is measured to be 262+/-15 mK at ~2.6 T, in good agreement with
previous measurements performed on samples with similar mobility, but with
electronic density larger by a factor of two. The role of disorder on the
nu=5/2 gap is examined. Comparison between experiment and theory indicates that
a large discrepancy remains for the intrinsic gap extrapolated from the
infinite mobility (zero disorder) limit. In contrast, no such large discrepancy
is found for the nu=1/3 Laughlin state. The observation of the nu=5/2 state in
the low-field regime implies that inclusion of non-perturbative Landau level
mixing may be necessary to better understand the energetics of half-filled
fractional quantum hall liquids.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 06:54:48 GMT"
},
{
"version": "v2",
"created": "Wed, 30 Jan 2008 18:53:11 GMT"
}
] | 2008-04-10T00:00:00 | [
[
"Dean",
"C. R.",
""
],
[
"Piot",
"B. A.",
""
],
[
"Hayden",
"P.",
""
],
[
"Sarma",
"S. Das",
""
],
[
"Gervais",
"G.",
""
],
[
"Pfeiffer",
"L. N.",
""
],
[
"West",
"K. W.",
""
]
] | [
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] |
801.3313 | Yuliang Yan | Yu-Liang Yan, Bao-Guo Dong, Dai-Mei Zhou, Xiao-Mei Li, Hai-Liang Ma,
Ben-Hao Sa | Parton rescattering effect on the charged hadron forward-backward
multiplicity correlation in $pp$ collisions at $\sqrt s$=200 GeV | 5 pages, 3 figures | null | null | null | nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parton rescattering effect on the charged hadron forward-backward
multiplicity correlation in $pp$ collisions at $\sqrt s$=200 GeV is studied by
a parton and hadron cascade model, PACIAE, based on the PYTHIA model. The
calculated multiplicity and pseudorapidity distribution of the final state
charged hadron are well compared with experimental data. It turned out that the
final state charged hadron pseudorapidity distribution are different from the
initial state charged partons. The parton rescattering effect on the charged
hadron forward-backward multiplicity correlation increases with increasing
parton rescattering strength in the center pseudorapidity region ($|\eta| <1$).
However, this effect becomes weaker in the outer pseudorapidity region
($|\eta|> 1$).
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 07:04:57 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Dec 2009 06:16:16 GMT"
}
] | 2009-12-16T00:00:00 | [
[
"Yan",
"Yu-Liang",
""
],
[
"Dong",
"Bao-Guo",
""
],
[
"Zhou",
"Dai-Mei",
""
],
[
"Li",
"Xiao-Mei",
""
],
[
"Ma",
"Hai-Liang",
""
],
[
"Sa",
"Ben-Hao",
""
]
] | [
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-0.0320401751,
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] |
801.3314 | Ciprian Tudor | Khalifa Es-Sebaiy, David Nualart, Youssef Ouknine, Ciprian Tudor (CES,
SAMOS) | Occupation densities for certain processes related to fractional
Brownian motion | null | null | null | null | math.PR | null | In this paper we establish the existence of a square integrable occupation
density for two classes of stochastic processes. First we consider a Gaussian
process with an absolutely continuous random drift, and secondly we handle the
case of a (Skorohod) integral with respect to the fractional Brownian motion
with Hurst parameter $H>\frac 12$. The proof of these results uses a general
criterion for the existence of a square integrable local time, which is based
on the techniques of Malliavin calculus.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 07:09:18 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Es-Sebaiy",
"Khalifa",
"",
"CES,\n SAMOS"
],
[
"Nualart",
"David",
"",
"CES,\n SAMOS"
],
[
"Ouknine",
"Youssef",
"",
"CES,\n SAMOS"
],
[
"Tudor",
"Ciprian",
"",
"CES,\n SAMOS"
]
] | [
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] |
801.3315 | Hiromitsu Takahashi | Kazuo Makishima, Hiromitsu Takahashi, Shin'ya Yamada, Chris Done, Aya
Kubota, Tadayasu Dotani, Ken Ebisawa, Takeshi Itoh, Shunji Kitamoto, Hitoshi
Negoro, Yoshihiro Ueda and Kazutaka Yamaoka | Suzaku Results on Cygnus X-1 in the Low/Hard State | 21 pages, 12 figures, accepted for Publications of the Astronomical
Society of Japan | null | 10.1093/pasj/60.3.585 | null | astro-ph | null | The black-hole binary Cygnus X-1 was observed for 17 ks with the Suzaku X-ray
observatory in 2005 October, while it was in a low/hard state with a 0.7-300
keV luminosity of 4.6 x 10^37 erg/s. The XIS and HXD spectra, spanning 0.7-400
keV, were reproduced successfully incorporating a cool accretion disk and a hot
Comptonizing corona. The corona is characterized by an electron temperature of
~100 keV, and two optical depths of ~0.4 and ~1.5 which account for the harder
and softer continua, respectively. The disk has the innermost temperature of
~0.2 keV, and is thought to protrude half way into the corona. The disk not
only provides seed photons to the Compton cloud, but also produces a soft
spectral excess, a mild reflection hump, and a weakly broadened iron line. A
comparison with the Suzaku data on GRO J1655-40 reveals several interesting
spectral differences, which can mostly be attributed to inclination effects
assuming that the disk has a flat geometry while the corona is grossly
spherical. An intensity-sorted spectroscopy indicates that the continuum
becomes less Comptonized when the source flares up on times scales of 1-200 s,
while the underlying disk remains unchanged.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 07:18:36 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Makishima",
"Kazuo",
""
],
[
"Takahashi",
"Hiromitsu",
""
],
[
"Yamada",
"Shin'ya",
""
],
[
"Done",
"Chris",
""
],
[
"Kubota",
"Aya",
""
],
[
"Dotani",
"Tadayasu",
""
],
[
"Ebisawa",
"Ken",
""
],
[
"Itoh",
"Takeshi",
""
],
[
"Kitamoto",
"Shunji",
""
],
[
"Negoro",
"Hitoshi",
""
],
[
"Ueda",
"Yoshihiro",
""
],
[
"Yamaoka",
"Kazutaka",
""
]
] | [
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] |
801.3316 | Zbigniew Koza | Maciej Matyka, Arzhang Khalili, Zbigniew Koza | Tortuosity-porosity relation in the porous media flow | null | Phys. Rev. E 78, 026306 (2008) | 10.1103/PhysRevE.78.026306 | null | physics.flu-dyn physics.comp-ph | null | We study numerically the tortuosity--porosity relation in a microscopic model
of a porous medium arranged as a collectin of freely overlapping squares. It is
demonstrated that the finite-size effects and the discretization errors, which
were ignored in previous studies, may cause significant underestimation of
tortuosity. The simple tortuosity calculation method proposed here eliminates
the need for using complicated, weighted averages. The numerical results
presented here are in good agreement with an empirical relation between
tortuosity ($T$) and porosity ($\phi$) given by $T-1\propto \ln\phi$, that was
found by others experimentally in granule packings and sediments. This relation
can be also written as $T-1\propto R S/\phi$ with $R$ and $S$ denoting the
hydraulic radius of granules and the specific surface area, respectively.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 12:21:45 GMT"
}
] | 2013-08-13T00:00:00 | [
[
"Matyka",
"Maciej",
""
],
[
"Khalili",
"Arzhang",
""
],
[
"Koza",
"Zbigniew",
""
]
] | [
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] |
801.3317 | Detlef Klimm | S. Ganschow, D. Klimm, P. Reiche, R. Uecker | On the Crystallization of Terbium Aluminium Garnet | 6 pages, 2 figures | Crystal Research and Technology 34 (1999) 615-619 | 10.1002/(SICI)1521-4079(199906)34:5/6<615::AID-CRAT615>3.0.CO;2-C | null | cond-mat.mtrl-sci physics.chem-ph | null | Attempts to grow terbium aluminium garnet (Tb3Al5O12, TAG) by the Czochralski
method lead to crystals of millimeter scale. Larger crystals could not be
obtained. DTA measurements within the binary system showed that TAG melts
incongruently at 1840 deg. C. The perovskite (TbAlO3, TAP) with a congruent
melting point of 1930 deg. C is the most stable phase in this system. The
region for primary crystallization of TAP covers the chemical composition of
TAG and suppresses the primary crystallization of the terbium aluminium garnet.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 07:41:57 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Ganschow",
"S.",
""
],
[
"Klimm",
"D.",
""
],
[
"Reiche",
"P.",
""
],
[
"Uecker",
"R.",
""
]
] | [
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] |
801.3318 | Yoav Tsori | Yoav Tsori, David Andelman and Jean-Fran\c{c}ois Joanny | Interfacial Instability of Charged End-Group Polymer Brushes | 6 pages, 3 figures | Europhys. Lett. 82, 46001 (2008) | 10.1209/0295-5075/82/46001 | null | cond-mat.soft | null | We consider a polymer brush grafted to a surface (acting as an electrode) and
bearing a charged group at its free end. Using a second distant electrode, the
brush is subject to a constant electric field. Based on a coarse-grained
continuum model, we calculate the average brush height and find that the brush
can stretch or compress depending on the applied field and charge end-group. We
further look at an undulation mode of the flat polymer brush and find that the
electrostatic energy scales linearly with the undulation wavenumber, $q$.
Competition with surface tension, scaling as $q^2$, tends to stabilize a
lateral $q$-mode of the polymer brush with a well-defined wavelength. This
wavelength depends on the brush height, surface separation, and several system
parameters.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 07:55:22 GMT"
}
] | 2012-01-31T00:00:00 | [
[
"Tsori",
"Yoav",
""
],
[
"Andelman",
"David",
""
],
[
"Joanny",
"Jean-François",
""
]
] | [
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] |
801.3319 | Pierpaolo Brutti | Pierpaolo Brutti | Warped Wavelet and Vertical Thresholding | Submitted to the Electronic Journal of Statistics
(http://www.i-journals.org/ejs/) by the Institute of Mathematical Statistics
(http://www.imstat.org) | null | null | IMS-EJS-EJS_2008_175 | math.ST stat.TH | null | Let $\{(X_i,Y_i)\}_{i\in \{1,..., n\}}$ be an i.i.d. sample from the random
design regression model $Y=f(X)+\epsilon$ with $(X,Y)\in [0,1]\times [-M,M]$.
In dealing with such a model, adaptation is naturally to be intended in terms
of $L^2([0,1],G_X)$ norm where $G_X(\cdot)$ denotes the (known) marginal
distribution of the design variable $X$. Recently much work has been devoted to
the construction of estimators that adapts in this setting (see, for example,
[5,24,25,32]), but only a few of them come along with a easy--to--implement
computational scheme. Here we propose a family of estimators based on the
warped wavelet basis recently introduced by Picard and Kerkyacharian [36] and a
tree-like thresholding rule that takes into account the hierarchical
(across-scale) structure of the wavelet coefficients. We show that, if the
regression function belongs to a certain class of approximation spaces defined
in terms of $G_X(\cdot)$, then our procedure is adaptive and converge to the
true regression function with an optimal rate. The results are stated in terms
of excess probabilities as in [19].
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 07:56:26 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Brutti",
"Pierpaolo",
""
]
] | [
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] |
801.332 | Roberto Floreanini | S. Anderloni, F. Benatti and R. Floreanini | Noise induced current in a double-well trap | 10 pages, LaTeX | null | null | null | quant-ph cond-mat.other | null | We study the behavior of cold atoms trapped in optical double well potentials
in presence of noise, either generated by an external environment or by the
trap itself. We show that quite in general the noise can induce a current
between the two wells even when tunneling between the two wells is highly
suppressed (Mott insulator phase). An engineered environment could provide a
test ground for the behavior of such a current.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 08:01:11 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Anderloni",
"S.",
""
],
[
"Benatti",
"F.",
""
],
[
"Floreanini",
"R.",
""
]
] | [
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] |
801.3321 | W. Prellier | R. Ranjith, Asish K. Kundu, M.Filippi, B.Kundys, W. Prellier, B.
Raveau, J. Laverdiere, M.P. Singh and S. Jandl | Ferromagnetism and magneto-dielectric effect in insulating
LaBiMn4/3Co2/3O6 thin films | Submitted to Appl. Phys. Lett. (2008) | Appl. Phys. Lett. 92, 062909 (2008) | 10.1063/1.2842409 | null | cond-mat.mtrl-sci | null | High quality epitaxial thin films of LaBiMn4/3Co2/3O6 perovskite were
fabricated on (001)-oriented SrTiO3 and LaAlO3 substrates by the pulsed laser
deposition technique. Magnetization measurements reveal a strong magnetic
anisotropy and a ferromagnetic behavior that is in agreement with a
super-exchange interaction between Mn4+ and Co2+ ions, which are randomly
distributed in the B-site. A distinct anomaly is observed in the dielectric
measurements at 130K corresponding to the onset of the magnetic ordering,
suggesting a coupling. Above this temperature, the extrinsic Maxwell-Wagner
effect is dominating. Theses results are explained using the Raman
spectroscopic studies indicating a weak spin-lattice interaction around this
magnetic transition.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 08:07:00 GMT"
}
] | 2008-02-18T00:00:00 | [
[
"Ranjith",
"R.",
""
],
[
"Kundu",
"Asish K.",
""
],
[
"Filippi",
"M.",
""
],
[
"Kundys",
"B.",
""
],
[
"Prellier",
"W.",
""
],
[
"Raveau",
"B.",
""
],
[
"Laverdiere",
"J.",
""
],
[
"Singh",
"M. P.",
""
],
[
"Jandl",
"S.",
""
]
] | [
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] |
801.3322 | Kaitai Li | Kaitai Li, Jian Su, Liquan Mei | Boundary Shape Control of Navier-Stokes Equations and Geometrical Design
Method for Blade's Surface in the Impeller | 27 pages | null | null | null | math.AP math-ph math.MP | null | In this paper A Geometrical Design Method for Blade's surface $\Im$ in the
impeller is provided here $\Im$ is a solution to a coupling system consisting
of the well-known Navier-Stokes equations and a four order elliptic boundary
value problem . The coupling system is used to describe the relations between
solutions of Navier-Stokes equations and the geometry of the domain occupied by
fluids, and also provides new theory and methods for optimal geometric design
of the boundary of domain mentioned above. This coupling system is the
Eular-Lagrange equations of the optimal control problem which is describing a
new principle of the geometric design for the blade's surface of an impeller.
The control variable is the surface of the blade and the state equations are
Navier-Stokes equations with mixed boundary conditions in the channel between
two blades. The objective functional depending on the geometry shape of blade's
surface describes the dissipation energy of the flow and the power of the
impeller. First we prove the existence of a solution of the optimal control
problem. Then we use a special coordinate system of the Navier-Stokes equations
to derive the objective functional which depends on the surface $\Theta$
explicitly. We also show the weakly continuity of the solution of the
Navier-Stokes equations with respect to the geometry shape of the blade's
surface.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 08:11:18 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Li",
"Kaitai",
""
],
[
"Su",
"Jian",
""
],
[
"Mei",
"Liquan",
""
]
] | [
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] |
801.3323 | Seung Chul Chae | Chunli Liu, S. C. Chae, S. H. Chang, S. B. Lee, T. W. Noh, J. S. Lee,
B. Kahng, D.-W. Kim, C. U. Jung, S. Seo and Seung-Eon Ahn | Abnormal Resistance Switching Behaviors of NiO Thin Films: Possible
Occurrence of Simultaneous Formation and Rupture of Conducting Channels | 12 pages, 5 figures | null | 10.1088/0022-3727/42/1/015506 | null | cond-mat.mtrl-sci | null | We report the detailed current-voltage (I-V) characteristics of resistance
switching in NiO thin films. In unipolar resistance switching, it is commonly
believed that conducting filaments will rupture when NiO changes from a low
resistance to a high resistance state. However, we found that this resistance
switching can sometimes show abnormal behavior during voltage- and
current-driven I-V measurements. We used the random circuit breaker network
model to explain how abnormal switching behaviors could occur. We found that
this resistance change can occur via a series of avalanche processes, where
conducting filaments could be formed as well as ruptured.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 08:24:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Liu",
"Chunli",
""
],
[
"Chae",
"S. C.",
""
],
[
"Chang",
"S. H.",
""
],
[
"Lee",
"S. B.",
""
],
[
"Noh",
"T. W.",
""
],
[
"Lee",
"J. S.",
""
],
[
"Kahng",
"B.",
""
],
[
"Kim",
"D. -W.",
""
],
[
"Jung",
"C. U.",
""
],
[
"Seo",
"S.",
""
],
[
"Ahn",
"Seung-Eon",
""
]
] | [
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801.3324 | Roberto A. Sussman | Roberto A. Sussman | Quasi-local variables in spherical symmetry: numerical applications to
dark matter and dark energy sources | Final version to appear in Physical Review D. More references added.
20 pages, RevTex 4 style, 8 pdf figures | Phys.Rev.D79:025009,2009 | 10.1103/PhysRevD.79.025009 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A numerical approach is considered for spherically symmetric spacetimes that
generalize Lemaitre-Tolman-Bondi dust solutions to nonzero pressure ("LTB
spacetimes"). We introduce quasi-local (QL) variables that are covariant LTB
objects satisfying evolution equations of Friedman-Lemaitre-Robertson-Walker
(FLRW) cosmologies. We prove rigorously that relative deviations of the local
covariant scalars from the QL scalars are non-linear, gauge invariant and
covariant perturbations on a FLRW formal "background" given by the QL scalars.
The dynamics of LTB spacetimes is completely determined by the QL scalars and
these exact perturbations. Since LTB spacetimes are compatible with a wide
variety of "equations of state", either single fluids or mixtures, a large
number of known solutions with dark matter and dark energy sources in a FLRW
framework (or with linear perturbations) can be readily examined under
idealized but non-trivial inhomogeneous conditions. Coordinate choices and
initial conditions are derived for a numerical treatment of the perturbation
equations, allowing us to study non-linear effects in a variety of phenomena,
such as gravitational collapse, non-local effects, void formation, dark matter
and dark energy couplings and particle creation. In particular, the embedding
of inhomogeneous regions can be performed by a smooth matching with a suitable
FLRW solution, thus generalizing the Newtonian "top hat" models that are widely
used in astrophysical literature. As examples of the application of the
formalism, we examine numerically the formation of a black hole in an expanding
Chaplygin gas FLRW universe, as well as the evolution of density clumps and
voids in an interactive mixture of cold dark matter and dark energy.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 09:44:07 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 22:41:41 GMT"
},
{
"version": "v3",
"created": "Wed, 30 Jan 2008 06:34:52 GMT"
},
{
"version": "v4",
"created": "Tue, 7 Oct 2008 07:40:43 GMT"
},
{
"version": "v5",
"created": "Tue, 23 Dec 2008 16:17:13 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"Sussman",
"Roberto A.",
""
]
] | [
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] |
801.3325 | Sergey Troshin | S.M. Troshin, N.E. Tyurin | Directed flow and rotation of transient matter | 4 pages, no figures, talk given at the XII Workshop on High Energy
Spin Physics, Dubna, Russia, September 3 - 7, 2007; to appear in the
Proceedings | null | null | null | hep-ph | null | Directed flow $v_1$ treated as an effect of the transient matter rotation in
hadronic and nuclei reactions.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 08:38:48 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] | [
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] |
801.3326 | Yaron Antebi | Ofer Aharony, Yaron E. Antebi, Micha Berkooz | On the Conformal Field Theory Duals of type IIA AdS_4 Flux
Compactifications | 42 pages, 1 figure, latex; v2: added references | JHEP 0802:093,2008 | 10.1088/1126-6708/2008/02/093 | WIS/02/08-JAN-DPP | hep-th | null | We study the conformal field theory dual of the type IIA flux
compactification model of DeWolfe, Giryavets, Kachru and Taylor, with all
moduli stabilized. We find its central charge and properties of its operator
spectrum. We concentrate on the moduli space of the conformal field theory,
which we investigate through domain walls in the type IIA string theory. The
moduli space turns out to consist of many different branches. We use Bezout's
theorem and Bernstein's theorem to enumerate the different branches of the
moduli space and estimate their dimension.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 09:39:39 GMT"
},
{
"version": "v2",
"created": "Tue, 5 Feb 2008 13:21:54 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Aharony",
"Ofer",
""
],
[
"Antebi",
"Yaron E.",
""
],
[
"Berkooz",
"Micha",
""
]
] | [
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] |
801.3327 | Albert Zijlstra | Albert Zijlstra, P.A.M. van Hoof, and R.A. Perley | The Evolution of NGC 7027 at Radio Frequencies: A New Determination of
the Distance and Core Mass | submitted to the Astrophysical Journal | null | 10.1086/588778 | null | astro-ph | null | We present the results of a 25-year program to monitor the radio flux
evolution of the planetary nebula NGC7027. We find significant evolution of the
spectral flux densities. The flux density at 1465 MHz, where the nebula is
optically thick, is increasing at a rate of 0.251+-0.015 % per year, caused by
the expansion of the ionized nebula. At frequencies where the emission is
optically thin, the spectral flux density is changing at a rate of
-0.145+-0.005 % per year, caused by a decrease in the number of ionizing
photons coming from the central star. A distance of 980+-100 pc is derived. By
fitting interpolated models of post-AGB evolution to the observed changes, we
find that over the 25-yr monitoring period, the stellar temperature has
increased by 3900+-900 K and the stellar bolometric luminosity has decreased by
1.75+-0.38 %. We derive a distance-independent stellar mass of 0.655+-0.01
solar masses adopting the Bloecker stellar evolution models, or about 0.04
solar masses higher when using models of Vassiliadis & Wood which may provide a
better fit. A Cloudy photoionization model is used to fit all epochs at all
frequencies simultaneously. The differences between the radio flux density
predictions and the observed values show some time-independent residuals of
typically 1 %. A possible explanation is inaccuracies in the radio flux scale
of Baars et al. We propose an adjustment to the flux density scale of the
primary radio flux calibrator 3C286, based on the Cloudy model of NGC7027. We
also calculate precise flux densities for NGC7027 for all standard continuum
bands used at the VLA, as well as for some new 30GHz experiments.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 09:16:45 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zijlstra",
"Albert",
""
],
[
"van Hoof",
"P. A. M.",
""
],
[
"Perley",
"R. A.",
""
]
] | [
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] |
801.3328 | Mihai Tibar | Raimundo Ara\'ujo dos Santos and Mihai Tib\u{a}r | Real map germs and higher open books | 12 pages | originally sent to London Math Soc on Dec. 7, 2007. Published
without Section 5 in Geom. Dedicata (2010), 147:177-185 | 10.1007/s10711-009-9449-z | null | math.AG math.CV | null | We present a general criterion for the existence of open book structures
defined by real map germs $(\bR^m, 0) \to (\bR^p, 0)$, where $m> p \ge 2$, with
isolated critical point. We show that this is satisfied by weighted-homogeneous
maps. We also derive sufficient conditions in case of map germs with isolated
critical value.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 09:18:37 GMT"
}
] | 2010-12-21T00:00:00 | [
[
"Santos",
"Raimundo Araújo dos",
""
],
[
"Tibăr",
"Mihai",
""
]
] | [
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] |
801.3329 | YaJuan Lei | Y.J. Lei, J.L. Qu, L.M. Song, C.M. Zhang, S. Zhang, F. Zhang, J.M.
Wang, Z.B. Li, G.B. Zhang | Evolution of cross-correlation and time lag of Cyg X-2 along the
branches | 23 pages 106 figures accepted for publication in ApJ | null | 10.1086/533423 | null | astro-ph | null | We report the detections of the anti-correlated soft and hard X-rays, and the
time lags of $\sim$ hecto-second from the neutron star low-mass X-ray binary
Cyg X-2, a well-known Z-type luminous source. Both the anti-correlation and the
positive correlation were detected during the low-intensity states, while only
the latter showed up during high-intensity states. Comparing with the lower
part of normal branch and flaring branch, more observations located on the
horizontal and the upper normal branches are accompanied with the
anti-correlation, implying the occurrence of the anti-correlation under
circumstance of a low mass accretion rate. So far the anti-correlated hard lag
of thousand-second timescale are only reported from the Galactic black hole
candidates in their hard states. Here we provide the first evidence that a
similar feature can also establish in a neutron-star system like Cyg X-2.
Finally, the possible origins of the observed time lags are discussed under the
current LMXB models.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:07:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lei",
"Y. J.",
""
],
[
"Qu",
"J. L.",
""
],
[
"Song",
"L. M.",
""
],
[
"Zhang",
"C. M.",
""
],
[
"Zhang",
"S.",
""
],
[
"Zhang",
"F.",
""
],
[
"Wang",
"J. M.",
""
],
[
"Li",
"Z. B.",
""
],
[
"Zhang",
"G. B.",
""
]
] | [
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] |
801.333 | Jean-Fran\c{c}ois Marckert | Jean-Fran\c{c}ois Marckert | The lineage process in Galton--Watson trees and globally centered
discrete snakes | Published in at http://dx.doi.org/10.1214/07-AAP450 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 209-244 | 10.1214/07-AAP450 | IMS-AAP-AAP450 | math.PR | null | We consider branching random walks built on Galton--Watson trees with
offspring distribution having a bounded support, conditioned to have $n$ nodes,
and their rescaled convergences to the Brownian snake. We exhibit a notion of
``globally centered discrete snake'' that extends the usual settings in which
the displacements are supposed centered. We show that under some additional
moment conditions, when $n$ goes to $+\infty$, ``globally centered discrete
snakes'' converge to the Brownian snake. The proof relies on a precise study of
the lineage of the nodes in a Galton--Watson tree conditioned by the size, and
their links with a multinomial process [the lineage of a node $u$ is the vector
indexed by $(k,j)$ giving the number of ancestors of $u$ having $k$ children
and for which $u$ is a descendant of the $j$th one]. Some consequences
concerning Galton--Watson trees conditioned by the size are also derived.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 09:42:39 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Marckert",
"Jean-François",
""
]
] | [
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] |
801.3331 | Guillaume Hanrot | Guillaume Hanrot (INRIA Lorraine - LORIA), Damien Stehl\'e (INRIA
Rh\^one-Alpes) | Worst-Case Hermite-Korkine-Zolotarev Reduced Lattice Bases | null | null | null | null | math.NT cs.CC cs.CR | null | The Hermite-Korkine-Zolotarev reduction plays a central role in strong
lattice reduction algorithms. By building upon a technique introduced by Ajtai,
we show the existence of Hermite-Korkine-Zolotarev reduced bases that are
arguably least reduced. We prove that for such bases, Kannan's algorithm
solving the shortest lattice vector problem requires
$d^{\frac{d}{2\e}(1+o(1))}$ bit operations in dimension $d$. This matches the
best complexity upper bound known for this algorithm. These bases also provide
lower bounds on Schnorr's constants $\alpha_d$ and $\beta_d$ that are
essentially equal to the best upper bounds. Finally, we also show the existence
of particularly bad bases for Schnorr's hierarchy of reductions.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 09:52:35 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 15:13:23 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Hanrot",
"Guillaume",
"",
"INRIA Lorraine - LORIA"
],
[
"Stehlé",
"Damien",
"",
"INRIA\n Rhône-Alpes"
]
] | [
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] |
801.3332 | Miguel Marques | Miguel A. L. Marques and N. N. Lathiotakis | Empirical Functionals for Reduced Density Matrix Functional Theory | 4 pages, 2 figures | Phys. Rev. A 77, 032509 (2008) | 10.1103/PhysRevA.77.032509 | null | physics.comp-ph physics.chem-ph | null | We present fully empirical exchange-correlation functionals to be used within
reduced density matrix functional theory (RDMFT). These are of the popular J-K
form, where the function of the occupation numbers that multiplies the Fock
orbital term is written as a Pade approximant. The coefficients of the Pade are
optimized for a testset of eight molecules, and then refined for a larger set
of 35 molecules. Two different approaches were tried, either keeping the
self-interaction terms, or by removing them explicitly from the functional. The
functionals thus obtained involve very few parameters, but are able to
outperform other RDMFT functionals, yielding correlation energies that are, on
average, even slightly better than Moeller-Plesset MP2 theory.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 09:59:50 GMT"
}
] | 2017-03-03T00:00:00 | [
[
"Marques",
"Miguel A. L.",
""
],
[
"Lathiotakis",
"N. N.",
""
]
] | [
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] |
801.3333 | Qing-Bo Yan | Qing-Bo Yan, Qing-Rong Zheng, and Gang Su | Structures, Electronic Properties, Spectroscopies and Hexagonal
Monolayer Phase of a Family of Unconventional Fullerenes C64X4 (X = H;
F;Cl;Br) | 17 pages, 6 figures | J. Phys. Chem. C 2007, 111, 549-554 | null | null | cond-mat.mtrl-sci | null | A systematic first-principles study within density functional theory on the
geometrical structures and electronic properties of unconventional fullerene
C64 and its derivatives C64X4 (X = H; F;Cl;Br) has been performed. By searching
through all 3465 isomers of C64, the ground state of C64 is found to be
spherical shape with D2 symmetry, which differs from the parent cage of the
recently synthesized C64H4 that is pear-shaped with C3v symmetry. We found that
the addition of the halogen atoms like F;Cl;Br to the pentagon-pentagon fusion
vertex of C64 cage could enhance the stability, forming the unconventional
fullerenes C64X4. The Mulliken charge populations, LUMO-HOMO gap energies and
density of states are calculated, showing that different halogen atoms added to
C64 will cause remarkably different charge populations of the C64X4 molecule;
the chemical deriving could enlarge the energy gaps and affect the electronic
structures distinctly. It is unveiled that C64F4 is even more stable than
C64H4, as the C-X bond energy of the former is higher than that of the latter.
The computed spectra of C64H4 molecules agree well with the experimental data;
the IR, Raman, NMR spectra of C64X4 (X = F;Cl;Br) are also calculated to
stimulate further experimental investigations. Finally, it is uncovered by
total energy calculations that C64X4 could form a stable hexagonal monolayer.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:05:33 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Yan",
"Qing-Bo",
""
],
[
"Zheng",
"Qing-Rong",
""
],
[
"Su",
"Gang",
""
]
] | [
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] |
801.3334 | Stefano Scopel | A. Bottino (1), N. Fornengo (1), G. Polesello (2), S. Scopel (3) ((1)
Univ. of Torino and INFN-Torino (2) INFN-Pavia (3) Korea Institute of
Advanced Study, Seoul) | Light neutralinos at LHC in cosmologically-inspired scenarios: new
benchmarks in the search for supersymmetry | 21 pages, 17 figures | Phys.Rev.D77:115026,2008 | 10.1103/PhysRevD.77.115026 | DFTT 3/2008, KIAS-P08014 | hep-ph astro-ph | null | We study how the properties of the four neutralino states, chi_i (i = 1, 2,
3, 4), can be investigated at the Large Hadron Collider (LHC), in the case when
the lightest one, chi_1, has a mass m_chi < 50 GeV and is stable. This
situation arises naturally in supersymmetric models where gaugino masses are
not unified at a Grand Unified (GUT) scale and R-parity is conserved. The main
features of these neutralino states are established by analytical and numerical
analyses, and two scenarios are singled out on the basis of the cosmological
properties required for the relic neutralinos. Signals expected at LHC are
discussed through the main chain processes started by a squark, produced in the
initial proton-proton scattering. We motivate the selection of some convenient
benchmarks, in the light of the spectroscopical properties (mass spectrum and
transitions) of the four neutralino states. Branching ratios and the expected
total number of events are derived in the various benchmarks, and their
relevance for experimental determination of neutralino properties is finally
discussed.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:15:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bottino",
"A.",
""
],
[
"Fornengo",
"N.",
""
],
[
"Polesello",
"G.",
""
],
[
"Scopel",
"S.",
""
]
] | [
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] |
801.3335 | Daniel Gazda | D. Gazda, E. Friedman, A. Gal, J. Mare\v{s} | Multi-$\bar{K}$ nuclei and kaon condensation | 21 pages, 8 figures, revised text and references | Phys.Rev.C77:045206,2008 | 10.1103/PhysRevC.77.045206 | null | nucl-th | null | We extend previous relativistic mean-field (RMF) calculations of multi-$\bar
K$ nuclei, using vector boson fields with SU(3) PPV coupling constants and
scalar boson fields constrained phenomenologically. For a given core nucleus,
the resulting $\bar K$ separation energy $B_{\bar K}$, as well as the
associated nuclear and $\bar K$-meson densities, saturate with the number
$\kappa$ of $\bar K$ mesons for $\kappa > \kappa_{\rm sat} \sim 10$. Saturation
appears robust against a wide range of variations, including the RMF nuclear
model used and the type of boson fields mediating the strong interactions.
Because $B_{\bar K}$ generally does not exceed 200 MeV, it is argued that
multi-$\bar K$ nuclei do not compete with multihyperonic nuclei in providing
the ground state of strange hadronic configurations and that kaon condensation
is unlikely to occur in strong-interaction self-bound strange hadronic matter.
Last, we explore possibly self-bound strange systems made of neutrons and
${\bar K}^0$ mesons, or protons and $K^-$ mesons, and study their properties.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:52:43 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 16:42:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Gazda",
"D.",
""
],
[
"Friedman",
"E.",
""
],
[
"Gal",
"A.",
""
],
[
"Mareš",
"J.",
""
]
] | [
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] |
801.3336 | Luca Pasquini | Luca Pasquini, M.P. Doellinger, A. Hatzes, J. Setiawan, L. Girardi, L.
da Silva, J.R. de Medeiros | Testing planet formation theories with Giant stars | IAU 249: Exoplanets: Detection, Formation and Dynamics J.L. Zhou,
Y.S. Sun & S. Ferraz-Mello, eds. in press | null | null | null | astro-ph | null | Planet searches around evolved giant stars are bringing new insights to
planet formation theories by virtue of the broader stellar mass range of the
host stars compared to the solar-type stars that have been the subject of most
current planet searches programs. These searches among giant stars are
producing extremely interesting results. Contrary to main sequence stars
planet-hosting giants do not show a tendency of being more metal rich. Even if
limited, the statistics also suggest a higher frequency of giant planets (at
least 10 %) that are more massive compared to solar-type main sequence stars.
The interpretation of these results is not straightforward. We propose that the
lack of a metallicity-planet connection among giant stars is due to pollution
of the star while on the main sequence, followed by dilution during the giant
phase. We also suggest that the higher mass and frequency of the planets are
due to the higher stellar mass. Even if these results do not favor a specific
formation scenario, they suggest that planetary formation might be more complex
than what has been proposed so far, perhaps with two mechanisms at work and one
or the other dominating according to the stellar mass. We finally stress as the
detailed study of the host stars and of the parent sample is essential to
derive firm conclusions.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:20:22 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Pasquini",
"Luca",
""
],
[
"Doellinger",
"M. P.",
""
],
[
"Hatzes",
"A.",
""
],
[
"Setiawan",
"J.",
""
],
[
"Girardi",
"L.",
""
],
[
"da Silva",
"L.",
""
],
[
"de Medeiros",
"J. R.",
""
]
] | [
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801.3337 | Jose Luis Toca-Herrera | Johann Faccelo Osma Cruz | Banana skin: a novel material for a low-cost production of laccase | Master Thesis (Chemical Engineering Department, Rovira i Virgili
University, Spain) Supervisors: Susana Rodriguez Couto and Jose L.
Toca-Herrera Pages: 28, Figures: 12, Tables: 1 | null | null | null | physics.chem-ph physics.bio-ph | null | Laccases (benzenodiol: oxygen oxidoreductases; EC 1.10.3.2) are multicopper
oxidases of wide substrate specificity mainly found in white-rot fungi, which
are the only microorganisms able to degrade the whole wood components, but they
are also expressed in bacteria and higher plants. Laccases are used currently
in biotechnological processes because this enzyme oxidizes both phenolic and
non-phenolic lignin-related compounds as well as highly recalcitrant
environmental pollutants. In this work banana skin has been selected as a
supporting material for laccase produntion because of its high content in
carbohydrates, which due to their organic nature are easily metabolized by the
fungus. In addition, its content in ascorbic acid exerts an inhibitory effect
against bacteria. The activity of the produced laccase is tested in
decoloration studies.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:23:03 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Cruz",
"Johann Faccelo Osma",
""
]
] | [
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] |
801.3338 | Andrea Fischer Miss | Andrzej Eilmes, Andrea M. Fischer, Rudolf A. R\"omer | Critical parameters for the disorder-induced metal-insulator transition
in FCC and BCC lattices | 7 RevTex pages, 9 figures with 10 figure files included, submitted to
Physical Review B | Phys. Rev. B 77, 245117-8 (2008) | 10.1103/PhysRevB.77.245117 | null | cond-mat.dis-nn cond-mat.mtrl-sci | null | We use a transfer-matrix method to study the disorder-induced metal-insulator
transition. We take isotropic nearest- neighbor hopping and an onsite potential
with uniformly distributed disorder. Following previous work done on the simple
cubic lattice, we perform numerical calculations for the body centered cubic
and face centered cubic lattices, which are more common in nature. We obtain
the localization length from calculated Lyapunov exponents for different system
sizes. This data is analyzed using finite-size scaling to find the critical
parameters. We create an energy-disorder phase diagram for both lattice types,
noting that it is symmetric about the band center for the body centered cubic
lattice, but not for the face centered cubic lattice. We find a critical
exponent of approximately 1.5-1.6 for both lattice types for transitions
occurring either at fixed energy or at fixed disorder, agreeing with results
previously obtained for other systems belonging to the same orthogonal
universality class. We notice an increase in critical disorder with the number
of nearest neighbors, which agrees with intuition.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:23:37 GMT"
}
] | 2008-07-16T00:00:00 | [
[
"Eilmes",
"Andrzej",
""
],
[
"Fischer",
"Andrea M.",
""
],
[
"Römer",
"Rudolf A.",
""
]
] | [
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] |
801.3339 | Colette Moeglin | Colette Moeglin (IMJ) | Holomorphie des op\'erateurs d'entrelacement normalis\'es \`a l'aide des
param\`etres d'Arthur | null | null | null | null | math.RT | null | In this paper we prove holomorphy for certain intertwining operators arising
from the theory of Eisenstein series.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:37:23 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Moeglin",
"Colette",
"",
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] |
801.334 | Long Jiang | Long Jiang | Convexity, translation invariance and subadditivity for $g$-expectations
and related risk measures | Published in at http://dx.doi.org/10.1214/105051607000000294 the
Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute
of Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 245-258 | 10.1214/105051607000000294 | IMS-AAP-AAP0229 | math.PR | null | Under the continuous assumption on the generator $g$, Briand et al.
[Electron. Comm. Probab. 5 (2000) 101--117] showed some connections between $g$
and the conditional $g$-expectation
$({\mathcal{E}}_g[\cdot|{\mathcal{F}}_t])_{t\in[0,T]}$ and Rosazza Gianin
[Insurance: Math. Econ. 39 (2006) 19--34] showed some connections between $g$
and the corresponding dynamic risk measure $(\rho^g_t)_{t\in[0,T]}$. In this
paper we prove that, without the additional continuous assumption on $g$, a
$g$-expectation ${\mathcal{E}}_g$ satisfies translation invariance if and only
if $g$ is independent of $y$, and ${\mathcal{E}}_g$ satisfies convexity (resp.
subadditivity) if and only if $g$ is independent of $y$ and $g$ is convex
(resp. subadditive) with respect to $z$. By these conclusions we deduce that
the static risk measure $\rho^g$ induced by a $g$-expectation ${\mathcal{E}}_g$
is a convex (resp. coherent) risk measure if and only if $g$ is independent of
$y$ and $g$ is convex (resp. sublinear) with respect to $z$. Our results extend
the results in Briand et al. [Electron. Comm. Probab. 5 (2000) 101--117] and
Rosazza Gianin [Insurance: Math. Econ. 39 (2006) 19--34] on these subjects.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 10:49:54 GMT"
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] | 2008-01-28T00:00:00 | [
[
"Jiang",
"Long",
""
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801.3341 | Mary Erlund | M.C. Erlund, A.C. Fabian, Katherine M. Blundell and Carolin S.
Crawford | The Compton-thick quasar at the heart of the high-redshift giant radio
galaxy 6C 0905+39 | 5 pages, 5 figures, accepted to MNRAS | null | 10.1111/j.1745-3933.2008.00448.x | null | astro-ph | null | Our XMM-Newton spectrum of the giant, high-redshift (z=1.88) radio galaxy 6C
0905+39 shows that it contains one of the most powerful, high-redshift,
Compton-thick quasars known. Its spectrum is very hard above 2 keV. The steep
XMM spectrum below that energy is shown to be due to extended emission from the
radio bridge using Chandra data. The nucleus of 6C 0905+39 has a column density
of 3.5 (+1.4,-0.4) X 10^24 cm^-2 and absorption-corrected X-ray luminosity of
1.7 (+0.9,-0.1) X 10^45 erg/s in the 2-10 keV band. A lower redshift active
galaxy in the same field, SDSS J090808.36+394313.6, may also be Compton-thick.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 12:07:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Erlund",
"M. C.",
""
],
[
"Fabian",
"A. C.",
""
],
[
"Blundell",
"Katherine M.",
""
],
[
"Crawford",
"Carolin S.",
""
]
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] |
801.3342 | Olaf Scholten | Olaf Scholten and Arjen van Vliet | Determining neutrino absorption spectra at Ultra-High Energies | 7 figures, submitted to JCAP revision: References updated and minor
changes in text | JCAP 0806:015,2008 | 10.1088/1475-7516/2008/06/015 | null | astro-ph | null | A very efficient method to measure the flux of Ultra-high energy (UHE)
neutrinos is through the detection of radio waves which are emitted by the
particle shower in the lunar regolith. The highest acceptance is reached for
radio waves in the frequency band of 100-200 MHz which can be measured with
modern radio telescopes. In this work we investigate the sensitivity of this
detection method to structures in the UHE neutrino spectrum caused by their
absorption on the low-energy relic anti-neutrino background through the Z-boson
resonance. The position of the absorption peak is sensitive to the neutrino
mass and the redshift of the source. A new generation of low-frequency digital
radio telescopes will provide excellent detection capabilities for measuring
these radio pulses, thus making our consideration here very timely.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:22:47 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Apr 2008 17:03:15 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Scholten",
"Olaf",
""
],
[
"van Vliet",
"Arjen",
""
]
] | [
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] |
801.3343 | Norbert Van den Bergh | H.R. Karimian, N. Van den Bergh and L. De Groote | Purely radiative perfect fluids with degenerate shear tensor | 8 pages, references added, typos corrected, simplified some algebraic
manipulations | Class.Quant.Grav.25:125010,2008 | 10.1088/0264-9381/25/12/125010 | null | gr-qc | null | We consider non-rotating geodesic perfect fluid spacetimes which are purely
radiative in the sense that the gravitational field satisfies the covariant
transverse conditions div H = div E = 0. We show that when the shear tensor S
is degenerate, H, E and S necessarily commute and hence the resulting
spacetimes are hypersurface homogeneous of Bianchi class A (modulo some purely
electric exceptions).
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:31:19 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Apr 2008 09:03:41 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Karimian",
"H. R.",
""
],
[
"Bergh",
"N. Van den",
""
],
[
"De Groote",
"L.",
""
]
] | [
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] |
801.3344 | Nicolas Clauvelin | N. Clauvelin, B. Audoly and S. Neukirch | Mechanical response of plectonemic DNA: an analytical solution | 14 pages, 4 figures | null | 10.1021/ma702713x | null | q-bio.BM | null | We consider an elastic rod model for twisted DNA in the plectonemic regime.
The molecule is treated as an impenetrable tube with an effective, adjustable
radius. The model is solved analytically and we derive formulas for the contact
pressure, twisting moment and geometrical parameters of the supercoiled region.
We apply our model to magnetic tweezer experiments of a DNA molecule subjected
to a tensile force and a torque, and extract mechanical and geometrical
quantities from the linear part of the experimental response curve. These
reconstructed values are derived in a self-contained manner, and are found to
be consistent with those available in the literature.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:36:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Clauvelin",
"N.",
""
],
[
"Audoly",
"B.",
""
],
[
"Neukirch",
"S.",
""
]
] | [
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801.3345 | Salih Celik | Salih Celik and Erg\"un Yasar | The Hopf algebra structure of the Z$_3$-graded quantum supergroup
GL$_{q,j}(1|1)$ | null | J. Math. Phys. 49 (2008) Art. No: 023511 | 10.1063/1.2873369 | null | math.QA | null | In this work, we give some features of the Z$_3$-graded quantum supergroup.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:38:38 GMT"
}
] | 2014-02-25T00:00:00 | [
[
"Celik",
"Salih",
""
],
[
"Yasar",
"Ergün",
""
]
] | [
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] |
801.3346 | Marco Lombardi | M. Lombardi, C. Lada, J. Alves | Hipparcos distances of Ophiuchus and Lupus cloud complexes | A&A in press - Corrected typo (Lupus distance) in the electronic
abstract | null | 10.1051/0004-6361:20079110 | null | astro-ph | null | We combine extinction maps from the Two Micron All Sky Survey (2MASS) with
Hipparcos and Tycho parallaxes to obtain reliable and high-precision estimates
of the distance to the Ophiuchus and Lupus dark complexes. Our analysis, based
on a rigorous maximum-likelihood approach, shows that the rho-Ophiuchi cloud is
located at (119 +/- 6) pc and the Lupus complex is located at (155 +/- 8) pc;
in addition, we are able to put constraints on the thickness of the clouds and
on their orientation on the sky (both these effects are not included in the
error estimate quoted above). For Ophiuchus, we find some evidence that the
streamers are closer to us than the core. The method applied in this paper is
currently limited to nearby molecular clouds, but it will find many natural
applications in the GAIA-era, when it will be possible to pin down the distance
and three-dimensional structure of virtually every molecular cloud in the
Galaxy.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:39:44 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 12:53:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lombardi",
"M.",
""
],
[
"Lada",
"C.",
""
],
[
"Alves",
"J.",
""
]
] | [
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] |
801.3347 | Grachev Stanislav | S.I. Grachev, V.K. Dubrovich | Dynamics of Primordial Hydrogen Recombination with Allowance for a
Recoil for Scattering in the Ly-alpha Line | 9 pages, 5 figures; accepted for publication in Astronomy Letters | null | 10.1134/S1063773708070013 | null | astro-ph | null | It is shown that taking into account a recoil for radiation scattering in the
Ly-alpha line can lead to a noticable acceleration of primordial hydrogen
recombination. Thus for LambdaCDM model a decrease of ionization degree exceeds
1% for redshifts z in a range 800 - 1050 achieving approximately 1.3% at z=900.
Corresponding corrections to the cosmic microwave background power spectra can
achieve 1.1% for TT spectra and 1.7% for EE ones. Radiative transfer in these
calculations was treated in a quasistationary approximation. Numerical
solutions are also obtained in diffusion approximation for a nonstationary
problem of Ly-alpha line radiative transfer under partial frequency
redistribution with a recoil. An evolution of a local line profile is traced to
as well as an evolution of a relative number of uncompensated transitions from
2p state down to 1s one. It is shown that taking into account nonstationarity
of Ly-alpha line radiative transfer can lead to an additional acceleration of
primordial hydrogen recombination.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:41:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Grachev",
"S. I.",
""
],
[
"Dubrovich",
"V. K.",
""
]
] | [
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] |
801.3348 | Theodoros Tsagaris | Theodoros Tsagaris | Statistical Arbitrage and Optimal Trading with Transaction Costs in
Futures Markets | 28 pages, submitted to journal | null | null | null | q-fin.TR math.OC math.PR | null | We consider the Brownian market model and the problem of expected utility
maximization of terminal wealth. We, specifically, examine the problem of
maximizing the utility of terminal wealth under the presence of transaction
costs of a fund/agent investing in futures markets. We offer some preliminary
remarks about statistical arbitrage strategies and we set the framework for
futures markets, and introduce concepts such as margin, gearing and slippage.
The setting is of discrete time, and the price evolution of the futures prices
is modelled as discrete random sequence involving Ito's sums. We assume the
drift and the Brownian motion driving the return process are non-observable and
the transaction costs are represented by the bid-ask spread. We provide
explicit solution to the optimal portfolio process, and we offer an example
using logarithmic utility.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:44:01 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Tsagaris",
"Theodoros",
""
]
] | [
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] |
801.3349 | Wei Zhu | Jianhong Ruan, Zhenqi Shen and Wei Zhu | Nuclear Shadowing and Antishadowing in a Unitarized BFKL Equation | 19 pages, 6 figures, to be appeared in Chinese Physics C | null | 10.1088/1674-1137/32/9/009 | null | hep-ph | null | The nuclear shadowing and antishadowing effects are explained by a unitarized
BFKL equation. The $Q^2$- and $x$-variations of the nuclear parton
distributions are detailed based on the level of the unintegrated gluon
distribution. In particular, the asymptotical behavior of the unintegrated
gluon distribution near the saturation limit in nuclear targets is studied. Our
results in the nuclear targets are insensitive to the input distributions if
the parameters are fixed by the data of a free proton.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:46:57 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Ruan",
"Jianhong",
""
],
[
"Shen",
"Zhenqi",
""
],
[
"Zhu",
"Wei",
""
]
] | [
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] |
801.335 | Xi Chen | Xi Chen, Qing-Rong Zheng and Gang Su | Quantum Oscillations of Tunnel Magnetoresistance Induced by Spin-Wave
Excitations in Ferromagnet-Ferromagnet-Ferromagnet Double Barrier Tunnel
Junctions | 19 pages, 6 figures | PHYSICAL REVIEW B 76,144409(2007) | 10.1103/PhysRevB.76.144409 | null | cond-mat.mes-hall | null | The possibility of quantum oscillations of the tunnel conductance and
magnetoresistance induced by spin-wave excitations in a
ferromagnet-ferromagnet-ferromagnet double barrier tunnel junction, when the
magnetizations of the two side ferromagnets are aligned antiparallel to that of
the middle ferromagnet, is investigated in a self-consistent manner by means of
Keldysh nonequilibrium Green function method. It has been found that owing to
the s-d exchange interactions between conduction electrons and the spin density
induced by spin accumulation in the middle ferromagnet, the differential
conductance and the TMR indeed oscillate with the increase of bias voltage,
being consistent with the phenomenon that is observed recently in experiments.
The effects of magnon modes, the energy levels of electrons as well as the
molecular field in the central ferromagnet on the oscillatory transport
property of the system are also discussed.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:47:47 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Chen",
"Xi",
""
],
[
"Zheng",
"Qing-Rong",
""
],
[
"Su",
"Gang",
""
]
] | [
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] |
801.3351 | Thorsten Schumm | Martin Trinker, S\"onke Groth, Stefan Haslinger, Stephanie Manz,
Thomas Betz, Israel Bar-Joseph, Thorsten Schumm, J\"org Schmiedmayer | Multi-layer atom chips for versatile atom micro manipulation | 4 pages, 5 figures | Appl. Phys. Lett. 92, 254102 (2008) | 10.1063/1.2945893 | null | physics.atom-ph physics.ins-det | null | We employ a combination of optical UV- and electron-beam-lithography to
create an atom chip combining sub-micron wire structures with larger
conventional wires on a single substrate. The new multi-layer fabrication
enables crossed wire configurations, greatly enhancing the flexibility in
designing potentials for ultra cold quantum gases and Bose-Einstein
condensates. Large current densities of >6 x 10^7 A/cm^2 and high voltages of
up to 65 V across 0.3 micron gaps are supported by even the smallest wire
structures. We experimentally demonstrate the flexibility of the next
generation atom chip by producing Bose-Einstein condensates in magnetic traps
created by a combination of wires involving all different fabrication methods
and structure sizes.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 11:48:15 GMT"
}
] | 2008-06-24T00:00:00 | [
[
"Trinker",
"Martin",
""
],
[
"Groth",
"Sönke",
""
],
[
"Haslinger",
"Stefan",
""
],
[
"Manz",
"Stephanie",
""
],
[
"Betz",
"Thomas",
""
],
[
"Bar-Joseph",
"Israel",
""
],
[
"Schumm",
"Thorsten",
""
],
[
"Schmiedmayer",
"Jörg",
""
]
] | [
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] |
801.3352 | Piero Barone | Piero Barone | On the condensed density of the generalized eigenvalues of pencils of
Hankel Gaussian random matrices and applications | 30 pages, 16 figures, better approximations provided | Journal of Multivariate Analysis 111 (2012) 160-173 | 10.1016/j.jmva.2012.05.009 | null | math.ST math.PR stat.CO stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pencils of Hankel matrices whose elements have a joint Gaussian distribution
with nonzero mean and not identical covariance are considered. An approximation
to the distribution of the squared modulus of their determinant is computed
which allows to get a closed form approximation of the condensed density of the
generalized eigenvalues of the pencils. Implications of this result for solving
several moments problems are discussed and some numerical examples are
provided.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 16:29:20 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Sep 2010 08:53:36 GMT"
}
] | 2012-09-28T00:00:00 | [
[
"Barone",
"Piero",
""
]
] | [
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] |
801.3353 | Yosef Rinott | Sergiu Hart, Yosef Rinott, Benjamin Weiss | Evolutionarily stable strategies of random games, and the vertices of
random polygons | Published in at http://dx.doi.org/10.1214/07-AAP455 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 259-287 | 10.1214/07-AAP455 | IMS-AAP-AAP455 | math.PR econ.TH | null | An evolutionarily stable strategy (ESS) is an equilibrium strategy that is
immune to invasions by rare alternative (``mutant'') strategies. Unlike Nash
equilibria, ESS do not always exist in finite games. In this paper we address
the question of what happens when the size of the game increases: does an ESS
exist for ``almost every large'' game? Letting the entries in the $n\times n$
game matrix be independently randomly chosen according to a distribution $F$,
we study the number of ESS with support of size $2.$ In particular, we show
that, as $n\to \infty$, the probability of having such an ESS: (i) converges to
1 for distributions $F$ with ``exponential and faster decreasing tails'' (e.g.,
uniform, normal, exponential); and (ii) converges to $1-1/\sqrt{e}$ for
distributions $F$ with ``slower than exponential decreasing tails'' (e.g.,
lognormal, Pareto, Cauchy). Our results also imply that the expected number of
vertices of the convex hull of $n$ random points in the plane converges to
infinity for the distributions in (i), and to 4 for the distributions in (ii).
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 12:37:16 GMT"
}
] | 2022-09-22T00:00:00 | [
[
"Hart",
"Sergiu",
""
],
[
"Rinott",
"Yosef",
""
],
[
"Weiss",
"Benjamin",
""
]
] | [
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801.3354 | Masaru Fujino | Masaru Fujino | $C^*$-algebras arising from substitutions | 19 pages | null | null | null | math.OA math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we introduce a $C^{\ast}$-algebra associated with a proper
primitive substitution. We show that the $C^{\ast}$-algebra is simple and
purely infinite and contains the associated Cuntz-Krieger algebra and the
crossed product $C^{\ast}$-algebra of the corresponding Cantor minimal system.
We calculate the $K$-groups.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 12:40:51 GMT"
},
{
"version": "v2",
"created": "Wed, 25 Jun 2008 22:32:18 GMT"
}
] | 2008-06-26T00:00:00 | [
[
"Fujino",
"Masaru",
""
]
] | [
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801.3355 | Robert Harlander | Robert Harlander, Jens Vollinga, Marcus Weber | Gluon-Induced Weak Boson Fusion | 9 pages, 8 figures (21 included ps- and eps-files) | Phys.Rev.D77:053010,2008 | 10.1103/PhysRevD.77.053010 | NIKHEF/2007-025, WUB/07-12 | hep-ph | null | The gluon-gluon induced terms for Higgs production through weak boson fusion
(WBF) are computed. Formally, these are of NNLO in the strong coupling
constant. This is the lowest order at which non-zero color exchange occurs
between the scattering quarks, leading to a color field and thus additional
hadronic activity between the outgoing jets. Using a minimal set of cuts, the
numerical impact of these terms is at the percent level with respect to the NLO
rate for weak boson fusion. Applying the so-called WBF cuts leads to an even
stronger suppression, so that we do not expect a significant deterioration of
the WFB signal by these color exchange effects.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 12:46:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Harlander",
"Robert",
""
],
[
"Vollinga",
"Jens",
""
],
[
"Weber",
"Marcus",
""
]
] | [
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] |
801.3356 | Viviane Baladi | Viviane Baladi and Daniel Smania | Analyticity of the SRB measure for holomorphic families of
quadratic-like Collet-Eckmann maps | 7 pages | null | null | null | math.DS | null | We show that if f_t is a holomorphic family of quadratic-like maps with all
periodic orbits repelling so that for each real t the map f_t is a real
Collet-Eckmann S-unimodal map then, writing m_t for the unique absolutely
continuous invariant probability measure of f_t, the map t -> \int g dm_t is
real analytic for any real analytic function g.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 12:48:36 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Baladi",
"Viviane",
""
],
[
"Smania",
"Daniel",
""
]
] | [
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] |
801.3357 | Florent Ravelet | Florent Ravelet (SPEC, AHD), Arnaud Chiffaudel (SPEC), Francois
Daviaud (SPEC) | Supercritical transition to turbulence in an inertially-driven von
Karman closed flow | null | Journal of Fluid Mechanics 601 (2008) 339-364 | null | null | physics.flu-dyn | null | We study the transition from laminar flow to fully developed turbulence for
an inertially-driven von Karman flow between two counter-rotating large
impellers fitted with curved blades over a wide range of Reynolds number (100 -
1 000 000). The transition is driven by the destabilisation of the azimuthal
shear-layer, i.e., Kelvin-Helmholtz instability which exhibits
travelling/drifting waves, modulated travelling waves and chaos below the
emergence of a turbulent spectrum. A local quantity -the energy of the velocity
fluctuations at a given point- and a global quantity -the applied torque- are
used to monitor the dynamics. The local quantity defines a critical Reynolds
number Rec for the onset of time-dependence in the flow, and an upper
threshold/crossover Ret for the saturation of the energy cascade. The
dimensionless drag coefficient, i.e., the turbulent dissipation, reaches a
plateau above this finite Ret, as expected for a "Kolmogorov"-like turbulence
for Re -> infinity. Our observations suggest that the transition to turbulence
in this closed flow is globally supercritical: the energy of the velocity
fluctuations can be considered as an order parameter characterizing the
dynamics from the first laminar time-dependence up to the fully developed
turbulence. Spectral analysis in temporal domain moreover reveals that almost
all of the fluctuations energy is stored in time-scales one or two orders of
magnitude slower than the time-scale based on impeller frequency.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 12:51:19 GMT"
}
] | 2008-03-17T00:00:00 | [
[
"Ravelet",
"Florent",
"",
"SPEC, AHD"
],
[
"Chiffaudel",
"Arnaud",
"",
"SPEC"
],
[
"Daviaud",
"Francois",
"",
"SPEC"
]
] | [
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] |
801.3358 | Mohammad R. Garousi | Mohammad R. Garousi, Hanif Golchin | On higher derivative corrections of tachyon action | 22 pages, 1 figure, latex file, V2: minor change in notation | Nucl.Phys.B800:547-564,2008 | 10.1016/j.nuclphysb.2008.03.005 | null | hep-th | null | We have examined the momentum expansion of the disk level S-matrix element of
two tachyons and two gauge fields to find, up to on-shell ambiguity, the
couplings of these fields in the world volume theory of N coincident non-BPS
D-branes to all order of $\alpha'$. Using the proposal that the action of
D-brane-anti-D-brane is given by the projection of the action of two non-BPS
D-branes with $(-1)^{F_L}$, we find the corresponding couplings in the world
volume theory of the brane-anti-brane system. Using these infinite tower of
couplings, we then calculate the massless pole of the scattering amplitude of
one RR field, two tachyons and one gauge field in the brane-anti-brane theory.
We find that the massless pole of the field theory amplitude is exactly equal
to the massless pole of the disk level S-matrix element of one RR, two tachyons
and one gauge field to all order of $\alpha'$.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:21:32 GMT"
},
{
"version": "v2",
"created": "Wed, 6 Feb 2008 14:31:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Garousi",
"Mohammad R.",
""
],
[
"Golchin",
"Hanif",
""
]
] | [
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] |
801.3359 | Ezio Maina | A. Ballestrero, A. Belhouari, G. Bevilacqua, V. Kashkan, E. Maina | PHANTOM: a Monte Carlo event generator for six parton final states at
high energy colliders | Version updated to agree with published one in Comp.Phys.Comm | null | 10.1016/j.cpc.2008.10.005 | DFTT 13/2007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | PHANTOM is a tree level Monte Carlo for six parton final states at
proton--proton, proton--antiproton and electron--positron collider at
O(alpha_ew^6) and O(alpha_ew^4*alpha_s^2) including possible interferences
between the two sets of diagrams. This comprehends all purely electroweak
contribution as well as all contributions with one virtual or two external
gluons. It can generate unweighted events for any set of processes and it is
interfaced to parton shower and hadronization packages via the last Les Houches
Accord protocol. It can be used to analyze the physics of boson boson
scattering, Higgs boson production in boson boson fusion, t-tbar and three
boson production.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:17:06 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Jan 2009 15:36:30 GMT"
}
] | 2009-01-05T00:00:00 | [
[
"Ballestrero",
"A.",
""
],
[
"Belhouari",
"A.",
""
],
[
"Bevilacqua",
"G.",
""
],
[
"Kashkan",
"V.",
""
],
[
"Maina",
"E.",
""
]
] | [
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] |
801.336 | Guido Montagna Dr | G. Balossini, C. Bignamini, C.M. Carloni Calame, G. Montagna, O.
Nicrosini and F. Piccinini | Photon pair production at flavour factories with per mille accuracy | 11 pages, 5 figures, 1 table | Phys.Lett.B663:209-213,2008 | 10.1016/j.physletb.2008.04.007 | FNT/T 2008/01, SHEP-08-05 | hep-ph hep-ex | null | We present a high-precision QED calculation, with 0.1% theoretical accuracy,
of two photon production in $e^+ e^-$ annihilation, as required by more and
more accurate luminosity monitoring at flavour factories. The accuracy of the
approach, which is based on the matching of exact next-to-leading order
corrections with a QED Parton Shower algorithm, is demonstrated through a
detailed analysis of the impact of the various sources of radiative corrections
to the experimentally relevant observables. The calculation is implemented in
the latest version of the event generator BabaYaga, available for precision
simulations of photon pair production at $e^+ e^-$ colliders of moderately high
energies.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:11:14 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Balossini",
"G.",
""
],
[
"Bignamini",
"C.",
""
],
[
"Calame",
"C. M. Carloni",
""
],
[
"Montagna",
"G.",
""
],
[
"Nicrosini",
"O.",
""
],
[
"Piccinini",
"F.",
""
]
] | [
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] |
801.3361 | Michael Buchoff | Paulo F. Bedaque, Michael I. Buchoff, Brian C. Tiburzi, Andre
Walker-Loud | Broken Symmetries from Minimally Doubled Fermions | 13 pages, 3 figures, published version, analysis reorganized and
condensed | Phys.Lett.B662:449-455,2008 | 10.1016/j.physletb.2008.03.034 | UMD-40762-406 | hep-lat hep-ph nucl-th | null | Novel chirally symmetric fermion actions containing the minimum amount of
fermion doubling have been recently proposed in the literature. We study the
symmetries and renormalization of these actions and find that in each case,
discrete symmetries, such as parity and time-reversal, are explicitly broken.
Consequently, when the gauge interactions are included, these theories
radiatively generate relevant and marginal operators. Thus the restoration of
these symmetries and the approach to the continuum limit require the
fine-tuning of several parameters. With some assumptions, we show that this
behavior is unavoidable for actions displaying minimal fermion doubling.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 20:18:14 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 20:17:28 GMT"
},
{
"version": "v3",
"created": "Mon, 21 Apr 2008 15:36:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bedaque",
"Paulo F.",
""
],
[
"Buchoff",
"Michael I.",
""
],
[
"Tiburzi",
"Brian C.",
""
],
[
"Walker-Loud",
"Andre",
""
]
] | [
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] |
801.3362 | Sophie Schlunk | Sophie Schlunk, Adela Marian, Wieland Schoellkopf, Gerard Meijer | AC electric trapping of neutral atoms | 10 pages, 13 figures, updated version, added journal reference | Phys. Rev. A 77, 043408 (2008) | 10.1103/PhysRevA.77.043408 | null | physics.atom-ph | null | We study the dynamic behavior of ultracold neutral atoms in a macroscopic ac
electric trap. Confinement in such a trap is achieved by switching between two
saddle-point configurations of the electric field. The gradual formation of a
stably trapped cloud is observed and the trap performance is studied versus the
switching frequency and the symmetry of the switching cycle. Additionally, the
electric field in the trap is mapped out by imaging the atom cloud while the
fields are still on. Finally, the phase-space acceptance of the trap is probed
by introducing a modified switching cycle. The experimental results are
reproduced using full three-dimensional trajectory calculations.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:37:14 GMT"
},
{
"version": "v2",
"created": "Mon, 14 Apr 2008 15:33:59 GMT"
}
] | 2008-04-14T00:00:00 | [
[
"Schlunk",
"Sophie",
""
],
[
"Marian",
"Adela",
""
],
[
"Schoellkopf",
"Wieland",
""
],
[
"Meijer",
"Gerard",
""
]
] | [
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] |
801.3363 | Daniel Neumaier | D. Neumaier, K. Wagner, U. Wurstbauer, M. Reinwald, W. Wegscheider and
D. Weiss | Phase coherent transport in (Ga,Mn)As | 22 pages, 10 figures | null | 10.1088/1367-2630/10/5/055016 | null | cond-mat.mes-hall | null | Quantum interference effects and resulting quantum corrections of the
conductivity have been intensively studied in disordered conductors over the
last decades. The knowledge of phase coherence lengths and underlying dephasing
mechanisms are crucial to understand quantum corrections to the resistivity in
the different material systems. Due to the internal magnetic field and the
associated breaking of time-reversal symmetry quantum interference effects in
ferromagnetic materials have been scarcely explored. Below we describe the
investigation of phase coherent transport phenomena in the newly discovered
ferromagnetic semiconductor (Ga,Mn)As. We explore universal conductance
fluctuations in mesoscopic (Ga,Mn)As wires and rings, the Aharonov-Bohm effect
in nanoscale rings and weak localization in arrays of wires, made of the
ferromagnetic semiconductor material. The experiments allow to probe the phase
coherence length L_phi and the spin flip length L_SO as well as the temperature
dependence of dephasing.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:39:48 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Neumaier",
"D.",
""
],
[
"Wagner",
"K.",
""
],
[
"Wurstbauer",
"U.",
""
],
[
"Reinwald",
"M.",
""
],
[
"Wegscheider",
"W.",
""
],
[
"Weiss",
"D.",
""
]
] | [
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] |
801.3364 | Mike Scherfner | M. Plaue, M. Scherfner, L.A.M. de Sousa Jr | On Spacetimes with Given Kinematical Invariants: Construction and
Examples | null | null | null | null | gr-qc | null | We present a useful method for the construction of cosmological models by
solving the differential equations arising from calculating the kinematical
invariants (shear, rotation, expansion and acceleration) of an observer field
in proper time description. As an application of our method we present two
generalizations of the G\"odel spacetime that follow naturally from our
approach.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:40:38 GMT"
},
{
"version": "v2",
"created": "Thu, 24 Jan 2008 13:24:40 GMT"
}
] | 2008-01-24T00:00:00 | [
[
"Plaue",
"M.",
""
],
[
"Scherfner",
"M.",
""
],
[
"Sousa",
"L. A. M. de",
"Jr"
]
] | [
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] |
801.3365 | Giuseppe Ruzzi | Romeo Brunetti, Giuseppe Ruzzi | Quantum charges and spacetime topology: The emergence of new
superselection sectors | null | Commun.Math.Phys.287:523-563,2009 | 10.1007/s00220-008-0671-6 | null | math-ph gr-qc hep-th math.MP | null | In which is developed a new form of superselection sectors of topological
origin. By that it is meant a new investigation that includes several
extensions of the traditional framework of Doplicher, Haag and Roberts in local
quantum theories. At first we generalize the notion of representations of nets
of C*-algebras, then we provide a brand new view on selection criteria by
adopting one with a strong topological flavour. We prove that it is coherent
with the older point of view, hence a clue to a genuine extension. In this
light, we extend Roberts' cohomological analysis to the case where 1--cocycles
bear non trivial unitary representations of the fundamental group of the
spacetime, equivalently of its Cauchy surface in case of global hyperbolicity.
A crucial tool is a notion of group von Neumann algebras generated by the
1-cocycles evaluated on loops over fixed regions. One proves that these group
von Neumann algebras are localized at the bounded region where loops start and
end and to be factorial of finite type I. All that amounts to a new invariant,
in a topological sense, which can be defined as the dimension of the factor. We
prove that any 1-cocycle can be factorized into a part that contains only the
charge content and another where only the topological information is stored.
This second part resembles much what in literature are known as geometric
phases. Indeed, by the very geometrical origin of the 1-cocycles that we
discuss in the paper, they are essential tools in the theory of net bundles,
and the topological part is related to their holonomy content. At the end we
prove the existence of net representations.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 14:00:42 GMT"
},
{
"version": "v2",
"created": "Mon, 3 Mar 2008 12:02:49 GMT"
}
] | 2009-03-20T00:00:00 | [
[
"Brunetti",
"Romeo",
""
],
[
"Ruzzi",
"Giuseppe",
""
]
] | [
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] |
801.3366 | Bulent Yilmaz | B. Yilmaz, S. Ayik, Y. Abe, and D. Boilley | Non-Markovian diffusion over a parabolic potential barrier: influence of
the friction-memory function | 20 pages, 12 figures, accepted to PRE | Phys. Rev. E 77, 011121 (2008). | 10.1103/PhysRevE.77.011121 | null | cond-mat.stat-mech cond-mat.other | null | The over-passing probability across an inverted parabolic potential barrier
is investigated according to the classical and quantal generalized Langevin
equations. It is shown that, in the classical case, the asymptotic value of the
over-passing probability is determined by a single dominant root of the
"characteristic function", and it is given by a simple expression. The
expression for the over-passing probability is quite general, and details of
dissipation mechanism and memory effects enter into the expression only through
the dominant root of the characteristic equation.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:47:43 GMT"
}
] | 2008-01-23T00:00:00 | [
[
"Yilmaz",
"B.",
""
],
[
"Ayik",
"S.",
""
],
[
"Abe",
"Y.",
""
],
[
"Boilley",
"D.",
""
]
] | [
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] |
801.3367 | Remon Cornelisse | Remon Cornelisse, Jorge Casares, Teo Munoz-Darias, Danny Steeghs, Phil
Charles, Rob Hynes, Kieran O'Brien | An Overview of the Bowen Survey; detecting donor star signatures in Low
Mass X-ray Binaries | 5 pages, 3 figures, Proceedings of "A Population Explosion: The
Nature and Evolution of X-ray Binaries in Diverse Environments", St.
Petersburg Beach, Florida, USA, 28 October - 2 November, 2007 | AIP Conf.Proc.1010:148-152,2008 | 10.1063/1.2945024 | null | astro-ph | null | In this paper we give a review of the Bowen fluorescence survey, showing that
narrow emission lines (mainly NIII and CIII lines between 4630 and 4660 A)
appear to be universally present in the Bowen blend of optically bright low
mass X-ray binaries. These narrow lines are attributed to reprocessing in the
companion star giving the first estimates of K_2, and thereby providing the
first constraints on their system parameters. We will give an overview of the
constraints on the masses of the compact objects and briefly highlight the most
important results of the survey. Furthermore, we will point out the most
promising systems for future follow-up studies and indicate how we think their
estimates of the component masses can be improved.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:49:10 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Cornelisse",
"Remon",
""
],
[
"Casares",
"Jorge",
""
],
[
"Munoz-Darias",
"Teo",
""
],
[
"Steeghs",
"Danny",
""
],
[
"Charles",
"Phil",
""
],
[
"Hynes",
"Rob",
""
],
[
"O'Brien",
"Kieran",
""
]
] | [
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801.3368 | Nakia Carlevaro | Nakia Carlevaro and Giovanni Montani | On the Role of Viscosity in Early Cosmology | 4 pages, no figure | Int. J. Mod. Phys. A 23, 1248-1252 (2008) | 10.1142/S0217751X08040160 | null | gr-qc astro-ph | null | We present a discussion of the effects induced by bulk viscosity on the very
early Universe stability. The viscosity coefficient is assumed to be related to
the energy density $\rho$ via a power-law of the form $\zeta=\zeta_0 \rho^s$
(where $\zeta_0, s=const.$) and the behavior of the density contrast in
analyzed.
In particular, we study both Einstein and hydrodynamic equations up to first
and second order in time in the so-called quasi-isotropic collapsing picture
near the cosmological singularity. As a result, we get a power-law solution
existing only in correspondence to a restricted domain of $\zeta_0$. The
particular case of pure isotropic FRW dynamics is then analyzed and we show how
the asymptotic approach to the initial singularity admits an unstable
collapsing picture.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:55:18 GMT"
},
{
"version": "v2",
"created": "Wed, 23 Jan 2008 10:36:22 GMT"
},
{
"version": "v3",
"created": "Tue, 15 Apr 2008 09:48:43 GMT"
},
{
"version": "v4",
"created": "Thu, 24 Apr 2008 10:00:11 GMT"
}
] | 2009-03-24T00:00:00 | [
[
"Carlevaro",
"Nakia",
""
],
[
"Montani",
"Giovanni",
""
]
] | [
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] |
801.3369 | Dr. Badam Singh Kushvah | Badam Singh Kushvah (Gwalior Engineering College Airport Road,
Maharajpura, Gwalior (M.P.)INDIA) | The Effect of Radiation Pressure on the Equilibrium Points in the
Generalised Photogravitational Restricted Three Body Problem | null | Astrophysics and Space Science, Volume 315, Numbers 1-4 / June,
2008 | 10.1007/s10509-008-9823-6 | null | math.DS | null | The existence of equilibrium points and the effect of radiation pressure have
been discussed numerically. The problem is generalized by considering bigger
primary as a source of radiation and small primary as an oblate spheroid. We
have also discussed the Poynting-Robertson(P-R) effect which is caused due to
radiation pressure. It is found that the collinear points $L_1,L_2,L_3$ deviate
from the axis joining the two primaries, while the triangular points $L_4,L_5$
are not symmetrical due to radiation pressure. We have seen that $L_1,L_2,L_3$
are linearly unstable while $L_4,L_5$ are conditionally stable in the sense of
Lyapunov when P-R effect is not considered. We have found that the effect of
radiation pressure reduces the linear stability zones while P-R effect induces
an instability in the sense of Lyapunov.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 13:59:14 GMT"
},
{
"version": "v2",
"created": "Fri, 16 May 2008 12:04:45 GMT"
}
] | 2009-02-08T00:00:00 | [
[
"Kushvah",
"Badam Singh",
"",
"Gwalior Engineering College Airport Road,\n Maharajpura, Gwalior"
]
] | [
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] |
801.337 | Richard Durrett | Richard Durrett, Mateo Restrepo | One-dimensional stepping stone models, sardine genetics and Brownian
local time | Published in at http://dx.doi.org/10.1214/07-AAP451 the Annals of
Applied Probability (http://www.imstat.org/aap/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Applied Probability 2008, Vol. 18, No. 1, 334-358 | 10.1214/07-AAP451 | IMS-AAP-AAP451 | math.PR | null | Consider a one-dimensional stepping stone model with colonies of size $M$ and
per-generation migration probability $\nu$, or a voter model on $\mathbb{Z}$ in
which interactions occur over a distance of order $K$. Sample one individual at
the origin and one at $L$. We show that if $M\nu/L$ and $L/K^2$ converge to
positive finite limits, then the genealogy of the sample converges to a pair of
Brownian motions that coalesce after the local time of their difference exceeds
an independent exponentially distributed random variable. The computation of
the distribution of the coalescence time leads to a one-dimensional parabolic
differential equation with an interesting boundary condition at 0.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 14:00:41 GMT"
}
] | 2008-01-28T00:00:00 | [
[
"Durrett",
"Richard",
""
],
[
"Restrepo",
"Mateo",
""
]
] | [
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] |
801.3371 | Zhuan Xu | X. F. Xu, Z. A. Xu, T. J. Liu, D. Fobes, Z. Q. Mao, J. L. Luo, Y. Liu | Band-dependent normal-state coherence in Sr$_{2}$RuO$_{4}$: Evidence
from Nernst effect and thermopower measurements | 4 pages, 4 figures; added figures, revised content; accepted by PRL | Phys. Rev. Lett. 101, 057002 (2008) | 10.1103/PhysRevLett.101.057002 | null | cond-mat.str-el cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first measurement on Nernst effect in the normal state of
odd-parity, spin-triplet superconductor Sr$_{2}$RuO$_{4}$. Below 100 K, the
Nernst signal was found to be negative, large, and, as a function of magnetic
field, nonlinear. Its magnitude increases with the decreasing temperature until
reaching a maximum around $T^*$ $\approx$ 20 - 25 K, below which it starts to
decrease linearly as a function of temperature. The large value of the Nernst
signal appears to be related to the multiband nature of the normal state and
the nonlinearity to band-dependent magnetic fluctuation in Sr$_{2}$RuO$_{4}$.
We argue that the sharp decrease in Nernst signal below $T^*$ is due to the
suppression of quasiparticle scattering and the emergence of band-dependent
coherence in the normal state. The observation of a sharp kink in the
temperature dependent thermopower around $T^*$ and a sharp drop of Hall angle
at low temperatures provide additional support to this picture.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 14:00:43 GMT"
},
{
"version": "v2",
"created": "Sat, 5 Jul 2008 12:04:59 GMT"
}
] | 2008-07-31T00:00:00 | [
[
"Xu",
"X. F.",
""
],
[
"Xu",
"Z. A.",
""
],
[
"Liu",
"T. J.",
""
],
[
"Fobes",
"D.",
""
],
[
"Mao",
"Z. Q.",
""
],
[
"Luo",
"J. L.",
""
],
[
"Liu",
"Y.",
""
]
] | [
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] |
801.3372 | Laurent Jacques | Laurent Jacques and Christophe De Vleeschouwer (Communications and
Remote Sensing Laboratory (TELE) Universit\'e catholique de Louvain (UCL),
Belgium.) | A Geometrical Study of Matching Pursuit Parametrization | 26 pages, 8 figures | null | 10.1109/TSP.2008.917379 | null | math.DG math.NA math.OC | null | This paper studies the effect of discretizing the parametrization of a
dictionary used for Matching Pursuit decompositions of signals. Our approach
relies on viewing the continuously parametrized dictionary as an embedded
manifold in the signal space on which the tools of differential (Riemannian)
geometry can be applied. The main contribution of this paper is twofold. First,
we prove that if a discrete dictionary reaches a minimal density criterion,
then the corresponding discrete MP (dMP) is equivalent in terms of convergence
to a weakened hypothetical continuous MP. Interestingly, the corresponding
weakness factor depends on a density measure of the discrete dictionary.
Second, we show that the insertion of a simple geometric gradient ascent
optimization on the atom dMP selection maintains the previous comparison but
with a weakness factor at least two times closer to unity than without
optimization. Finally, we present numerical experiments confirming our
theoretical predictions for decomposition of signals and images on regular
discretizations of dictionary parametrizations.
| [
{
"version": "v1",
"created": "Tue, 22 Jan 2008 14:05:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jacques",
"Laurent",
"",
"Communications and\n Remote Sensing Laboratory"
],
[
"De Vleeschouwer",
"Christophe",
"",
"Communications and\n Remote Sensing Laboratory"
]
] | [
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