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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0708.0149 | Marcel Clemens | M. S. Clemens, O. Vega, A. Bressan, G. L. Granato, L. Silva, P.
Panuzzo | Modeling the spectral energy distribution of ULIRGs I: the radio spectra | 16 pages. Submitted to A&A Re-submitted, with aesthetic improvements
to the text and figures | null | 10.1051/0004-6361:20077224 | null | astro-ph | null | As a constraint for new starburst/AGN models of IRAS bright galaxies we
determine the radio spectra of 31 luminous and ultraluminous IRAS galaxies
(LIRGs/ULIRGs). We construct the radio spectra using both new and archival
data. From our sample of radio spectra we find that very few have a straight
power-law slope. Although some sources show a flattening of the radio spectral
slope at high frequencies the average spectrum shows a steepening of the radio
spectrum from 1.4 to 22.5 GHz. This is unexpected because in sources with high
rates of star formation we expect flat spectrum, free-free emission to make a
significant contribution to the radio flux at higher radio frequencies. Despite
this trend the radio spectral indices between 8.4 and 22.5 GHz are flatter for
sources with higher values of the FIR-radio flux density ratio q, when this is
calculated at 8.4 GHz. Therefore, sources that are deficient in radio emission
relative to FIR emission (presumably younger sources) have a larger thermal
component to their radio emission. However, we find no correlation between the
radio spectral index between 1.4 and 4.8 GHz and q at 8.4 GHz. Because the low
frequency spectral index is affected by free-free absorption, and this is a
function of source size for a given mass of ionized gas, this is evidence that
the ionized gas in ULIRGs shows a range of densities. The youngest LIRGs and
ULIRGs are characterized by a larger contribution to their high-frequency radio
spectra from free-free emission. However, the youngest sources are not those
that have the greatest free-free absorption at low radio frequencies. The
sources in which the effects of free-free absorption are strongest are instead
the most compact sources. Although these have the warmest FIR colours, they are
not necessarily the youngest sources.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:18:50 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 13:57:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Clemens",
"M. S.",
""
],
[
"Vega",
"O.",
""
],
[
"Bressan",
"A.",
""
],
[
"Granato",
"G. L.",
""
],
[
"Silva",
"L.",
""
],
[
"Panuzzo",
"P.",
""
]
] |
0708.0150 | Gong Baihua | Baihua Gong, Jun Liu, Liang Huang, Kongqing Yang | Range-based attacks on links in random scale-free networks | null | null | 10.1088/1742-5468/2008/02/P02008 | null | cond-mat.stat-mech | null | $Range$ and $load$ play keys on the problem of attacking on links in random
scale-free (RSF) networks. In this Brief Report we obtain the relation between
$range$ and $load$ in RSF networks analytically by the generating function
theory, and then give an estimation about the impact of attacks on the
$efficiency$ of the network. The analytical results show that short range
attacks are more destructive for RSF networks, and are confirmed numerically.
Further our results are consistent with the former literature (Physical Review
E \textbf{66}, 065103(R) (2002)).
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:27:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gong",
"Baihua",
""
],
[
"Liu",
"Jun",
""
],
[
"Huang",
"Liang",
""
],
[
"Yang",
"Kongqing",
""
]
] |
0708.0151 | Matthias Kuenzer | Matthias Kuenzer | Nonisomorphic Verdier octahedra on the same base | typos corrected | JHRS 4(1), p. 7-38, 2009 | null | null | math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show by an example that in a Verdier triangulated category, there may
exist two mutually nonisomorphic Verdier octahedra containing the same
commutative triangle.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:31:39 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 11:17:33 GMT"
},
{
"version": "v3",
"created": "Wed, 11 Mar 2009 17:04:07 GMT"
},
{
"version": "v4",
"created": "Mon, 16 Mar 2009 13:53:24 GMT"
}
] | 2009-03-16T00:00:00 | [
[
"Kuenzer",
"Matthias",
""
]
] |
0708.0152 | Joachim Kopp | Joachim Kopp, Manfred Lindner, Toshihiko Ota, Joe Sato | Non-standard neutrino interactions in reactor and superbeam experiments | 24 pages, 12 figures, 2 tables, RevTeX 4, minor clarifications,
matches published version | Phys.Rev.D77:013007,2008 | 10.1103/PhysRevD.77.013007 | STUPP-07-192 | hep-ph hep-ex | null | The formalism of non-standard four-fermion interactions provides a
convenient, model-independent way of parameterizing a wide class of ``new
physics'' scenarios. In this article, we study the performance of reactor and
superbeam neutrino experiments in the presence of such non-standard
interactions (NSI). Due to interference between the standard and non-standard
amplitudes, sizeable effects are to be expected if the NSI parameters are close
to their current upper limits. We derive approximate formulas for the relevant
oscillation probabilities including NSI, and show how the leading effects can
be understood intuitively even without any calculations. We will present a
classification of all possible NSI according to their impact on reactor and
superbeam experiments, and it will turn out that these experiments are highly
complementary in terms of their sensitivity to the non-standard parameters. The
second part of the paper is devoted to detailed numerical simulations, which
will demonstrate how a standard oscillation fit of the mixing angle theta-13
may fail if experimental data is affected by NSI. We find that for some
non-standard terms, reactor and superbeam experiments would yield seemingly
conflicting results, while in other cases, they may agree well with each other,
but the resulting value for theta-13 could be far from the true value. This
offset may be so large that the true theta-13 is even ruled out erroneously. In
the last section of the paper, we demonstrate that reactor and superbeam data
can actually establish the presence of non-standard interactions. Throughout
our discussion, we pay special attention to the impact of the complex phases,
and of the near detectors.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:45:16 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 10:19:43 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kopp",
"Joachim",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Ota",
"Toshihiko",
""
],
[
"Sato",
"Joe",
""
]
] |
0708.0153 | Ginestra Bianconi | Ginestra Bianconi | The entropy of randomized network ensembles | (6 pages,1 figure,2 tables) | Europhys. Lett. 81, 28005 (2008) | 10.1209/0295-5075/81/28005 | null | cond-mat.dis-nn cond-mat.stat-mech | null | Randomized network ensembles are the null models of real networks and are
extensivelly used to compare a real system to a null hypothesis. In this paper
we study network ensembles with the same degree distribution, the same
degree-correlations or the same community structure of any given real network.
We characterize these randomized network ensembles by their entropy, i.e. the
normalized logarithm of the total number of networks which are part of these
ensembles.
We estimate the entropy of randomized ensembles starting from a large set of
real directed and undirected networks. We propose entropy as an indicator to
assess the role of each structural feature in a given real network.We observe
that the ensembles with fixed scale-free degree distribution have smaller
entropy than the ensembles with homogeneous degree distribution indicating a
higher level of order in scale-free networks.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:40:50 GMT"
},
{
"version": "v2",
"created": "Sat, 17 Nov 2007 14:23:58 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bianconi",
"Ginestra",
""
]
] |
0708.0154 | Mi Xie | Wu-Sheng Dai and Mi Xie | Upper limit on the transition temperature for non-ideal Bose gases | 7 pages, 1 figure | Ann. Phys. (New York) 322, 1771-1775 (2007) | 10.1016/j.aop.2006.11.003 | null | cond-mat.stat-mech cond-mat.supr-con | null | In this paper we show that for a non-ideal Bose gas there exists an upper
limit on the transition temperature above which Bose-Einstein condensation
cannot occur regardless of the pressure applied. Such upper limits for some
realistic Bose gases are estimated. This result implies that there may also
exist an upper limit on the transition temperature of superconductors.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:55:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dai",
"Wu-Sheng",
""
],
[
"Xie",
"Mi",
""
]
] |
0708.0155 | Zhi-Gang Wang | Zhi-Gang Wang (Baoding) | Is D_s(2700) a charmed tetraquark state ? | 12 pages, 3 figures, extended version | Chin.Phys.C32:797-802,2008 | 10.1088/1674-1137/32/10/006 | null | hep-ph | null | In this article, we take the point of view that the $D_s(2700)$ be a
tetraquark state, which consists of a scalar diquark and a vector antidiquark,
and calculate its mass with the QCD sum rules. The numerical result indicates
that the mass of the vector charmed tetraquark state is about
$M_V=(3.75\pm0.18)\rm{GeV}$ or $M_V=(3.71\pm0.15)\rm{GeV}$ from different sum
rules, which is about $1\rm{GeV}$ larger than the experimental data. Such
tetraquark component should be very small in the $D_s(2700)$.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:00:19 GMT"
},
{
"version": "v2",
"created": "Thu, 23 Aug 2007 09:12:19 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Jan 2008 03:14:06 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Wang",
"Zhi-Gang",
"",
"Baoding"
]
] |
0708.0156 | Maria Barbi | Aurelien Bancaud, Gaudeline Wagner, Natalia Conde e Silva, Christophe
Lavelle, Hua Wong, Julien Mozziconacci, Maria Barbi, Andrei Sivolob, Eric Le
Cam, Liliane Mouawad, Jean-Louis Viovy, Jean-Marc Victor and Ariel Prunell | Nucleosome Chiral Transition under Positive Torsional Stress in Single
Chromatin Fibers | 33 pages (double spacing), 7 figures | Molecular Cell 27, 135-147, 2007 | 10.1016/j.molcel.2007.05.037 | null | q-bio.BM | null | Using magnetic tweezers to investigate the mechanical response of single
chromatin fibers, we show that fibers submitted to large positive torsion
transiently trap positive turns, at a rate of one turn per nucleosome. A
comparison with the response of fibers of tetrasomes (the (H3-H4)2 tetramer
bound with ~50 bp of DNA) obtained by depletion of H2A-H2B dimers, suggests
that the trapping reflects a nucleosome chiral transition to a metastable form
built on the previously documented righthanded tetrasome. In view of its low
energy, <8 kT, we propose this transition is physiologically relevant and
serves to break the docking of the dimers on the tetramer which in the absence
of other factors exerts a strong block against elongation of transcription by
the main RNA polymerase.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:57:47 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Sep 2007 13:59:04 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Bancaud",
"Aurelien",
""
],
[
"Wagner",
"Gaudeline",
""
],
[
"Silva",
"Natalia Conde e",
""
],
[
"Lavelle",
"Christophe",
""
],
[
"Wong",
"Hua",
""
],
[
"Mozziconacci",
"Julien",
""
],
[
"Barbi",
"Maria",
""
],
[
"Sivolob",
"Andrei",
""
],
[
"Cam",
"Eric Le",
""
],
[
"Mouawad",
"Liliane",
""
],
[
"Viovy",
"Jean-Louis",
""
],
[
"Victor",
"Jean-Marc",
""
],
[
"Prunell",
"Ariel",
""
]
] |
0708.0157 | Wolfgang Lerche | H.Jockers and W.Lerche | Matrix Factorizations, D-Branes and their Deformations | 20p, 5 figs, Proceedings of Cargese school on string theory, 2006 | Nucl.Phys.Proc.Suppl.171:196-214,2007 | 10.1016/j.nuclphysbps.2007.06.012 | CERN-PH-TH/2007-134 | hep-th | null | We review in elementary, non-technical terms the description of topological
B-type of D-branes in terms of boundary Landau-Ginzburg theory, as well as some
applications.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 13:57:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Jockers",
"H.",
""
],
[
"Lerche",
"W.",
""
]
] |
0708.0158 | Kirpal Nandra | K. Nandra (Imperial College London), K. Iwasawa (MPE) | A Compton Thick AGN Powering the Hyperluminous Infrared Galaxy IRAS
00182--7112 | 6 pages, 3 figures, accepted for publication in MNRAS Letters | null | 10.1111/j.1745-3933.2007.00372.x | null | astro-ph | null | We present X-ray observations of the Hyperluminous Infrared Galaxy (HLIRG)
IRAS 00182--7112 (F00183--7111) obtained using the XMM-Newton EPIC camera. A
luminous hard X-ray source co-incident with the nucleus is revealed, along with
weaker soft X-ray emission which may be extended or offset from the hard. The
EPIC spectrum is extremely flat and shows Fe K$\alpha$ emission with very high
equivalent width: both are typical characteristics of a buried, Compton--thick
AGN which is seen only in scattered light. Perhaps the most remarkable
characteristic of the spectrum is that the Fe K$\alpha$ line energy is that of
He-like iron, making IRAS 00182--7112 the first hidden AGN known to be
dominated by ionized, Compton thick reflection. Taking an appropriate
bolometric correction we find that this AGN could easily dominate the FIR
energetics. The nuclear reflection spectrum is seen through a relatively cold
absorber with column density consistent with recent Spitzer observations. The
soft X-ray emission, which may be thermal in nature and associated with
star-forming activity, is seen unabsorbed. The soft X-rays and weak PAH
features both give estimates of the star formation rate $\sim 300 M_{\odot}$
yr$^{-1}$, insufficient to power the FIR emission and supportive of the idea
that this HLIRG is AGN-dominated.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:09:08 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Nandra",
"K.",
"",
"Imperial College London"
],
[
"Iwasawa",
"K.",
"",
"MPE"
]
] |
0708.0159 | Zhaoqing Feng | Feng Zhao-Qing, Jin Gen-Ming, Huang Ming-Hui, Gan Zai-Guo, Wang Nan,
Li Jun-Qing | Possible Way to Synthesize Superheavy Element Z=117 | 10 pages, 4 figures, 1 table | Chin.Phys.Lett.24:2551,2007 | 10.1088/0256-307X/24/9/024 | null | nucl-th | null | Within the framework of the dinuclear system model, the production of
superheavy element Z=117 in possible projectile-target combinations is analyzed
systematically. The calculated results show that the production cross sections
are strongly dependent on the reaction systems. Optimal combinations,
corresponding excitation energies and evaporation channels are proposed in this
letter, such as the isotopes ^{248,249}Bk in ^{48}Ca induced reactions in 3n
evaporation channels and the reactions ^{45}Sc+^{246,248}Cm in 3n and 4n
channels, and the system ^{51}V+^{244}Pu in 3n channel.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:09:18 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Zhao-Qing",
"Feng",
""
],
[
"Gen-Ming",
"Jin",
""
],
[
"Ming-Hui",
"Huang",
""
],
[
"Zai-Guo",
"Gan",
""
],
[
"Nan",
"Wang",
""
],
[
"Jun-Qing",
"Li",
""
]
] |
0708.0160 | Reinhard Schwienhorst | Reinhard Schwienhorst | Colliding neutrino beams | 29 pages, submitted to Phys. Rev. D; updated contents, added figures | Mod.Phys.Lett.A23:2751-2761,2008 | 10.1142/S0217732308028193 | null | hep-ex | null | From several neutrino oscillation experiments, we understand now that
neutrinos have mass. However, we really don't know what mechanism is
responsible for producing this neutrino mass. Current or planned neutrino
experiments utilize neutrino beams and long-baseline detectors to explore
flavor mixing but do not address the question of the origin of neutrino mass.
In order to answer that question, neutrino interactions need to be explored at
much higher energies. This paper outlines a program to explore neutrinos and
their interactions with various particles through a series of experiments
involving colliding neutrino beams.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:15:18 GMT"
},
{
"version": "v2",
"created": "Thu, 8 Nov 2007 12:43:50 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Schwienhorst",
"Reinhard",
""
]
] |
0708.0161 | Francesco Mezzadri | A. R. Its, F. Mezzadri and M. Y. Mo | Entanglement entropy in quantum spin chains with finite range
interaction | 75 pages, 10 figures. Revised version with minor corrections | Commun. Math. Phys., Vol. 284 (2008), 117-185 | 10.1007/s00220-008-0566-6 | null | math-ph math.MP quant-ph | null | We study the entropy of entanglement of the ground state in a wide family of
one-dimensional quantum spin chains whose interaction is of finite range and
translation invariant. Such systems can be thought of as generalizations of the
XY model. The chain is divided in two parts: one containing the first
consecutive L spins; the second the remaining ones. In this setting the entropy
of entanglement is the von Neumann entropy of either part. At the core of our
computation is the explicit evaluation of the leading order term as L tends to
infinity of the determinant of a block-Toeplitz matrix whose symbol belongs to
a general class of 2 x 2 matrix functions. The asymptotics of such determinant
is computed in terms of multi-dimensional theta-functions associated to a
hyperelliptic curve of genus g >= 1, which enter into the solution of a
Riemann-Hilbert problem. Phase transitions for thes systems are characterized
by the branch points of the hyperelliptic curve approaching the unit circle. In
these circumstances the entropy diverges logarithmically. We also recover, as
particular cases, the formulae for the entropy discovered by Jin and Korepin
(2004) for the XX model and Its, Jin and Korepin (2005,2006) for the XY model.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:14:06 GMT"
},
{
"version": "v2",
"created": "Thu, 10 Apr 2008 12:56:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Its",
"A. R.",
""
],
[
"Mezzadri",
"F.",
""
],
[
"Mo",
"M. Y.",
""
]
] |
0708.0162 | Anna-Zuzana Dubnickova | A.Z. Dubnickova, S. Dubnicka | Implication of the proton electric FF space-like behavior puzzle in
various physical phenomena | Talk given at XLI PNPI Winter School in Repino 19-25 February 2007 | null | null | null | hep-ph | null | By means of the 10-resonance unitary and analytic model of nucleon
electromagnetic structure it is demonstrated that the JLab proton polarization
data on the ratio $\mu_p G_{Ep}(Q^2)/G_{Mp}(Q^2)$ are consistent with all form
factor properties, however, they strongly require an existence of the zero in
G_{Ep}(Q^2) around Q^2=13 GeV^2. As a result there are two contradicting
behaviors of G_{Ep}(Q^2) in space-like region. Consequences of this phenomenon
on the charge distribution within the proton, on the saturation of the new
proton-neutron q^2-dependent sum rule, on the behavior of strange nucleon form
factors and the deuteron elastic structure functions through the impulse
approximation are investigated.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:24:45 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Dubnickova",
"A. Z.",
""
],
[
"Dubnicka",
"S.",
""
]
] |
0708.0163 | Gergely G\'abor Barnaf\"oldi | V. Gogokhia, G.G. Barnafoldi | Vacuum Energy Density in the Quantum Yang - Mills Theory | 28 pages and 4 figures, typos corrected, added new appendices and new
references in comparison with the published version | J.Phys.G37:025003,2010 | 10.1088/0954-3899/37/2/025003 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the effective potential approach for composite operators, we have
formulated a general method of calculation of the truly non-perturbative
Yang-Mills vacuum energy density (this is, by definition, the Bag constant
apart from the sign). It is the main dynamical characteristic of the QCD ground
state. Our method allows one to make it free of the perturbative contributions
('contaminations'), by construction. We also perform an actual numerical
calculation of the Bag constant for the confining effective charge. Its choice
uniquely defines the Bag constant, which becomes free of all the types of the
perturbative contributions now, as well as possessing many other desirable
properties as colorless, gauge independence, etc. Using further the trace
anomaly relation, we develop a general formalism which makes it possible to
relate the Bag constant to the gluon condensate not using the weak coupling
solution for the corresponding $\beta$ function. Our numerical result for the
Bag constant shows a good agreement with other phenomenological estimates of
the gluon condensate.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:24:33 GMT"
},
{
"version": "v2",
"created": "Wed, 5 Sep 2007 21:14:42 GMT"
},
{
"version": "v3",
"created": "Wed, 24 Oct 2007 02:50:34 GMT"
},
{
"version": "v4",
"created": "Fri, 28 Dec 2007 22:57:45 GMT"
},
{
"version": "v5",
"created": "Sun, 9 Aug 2009 23:12:52 GMT"
},
{
"version": "v6",
"created": "Tue, 19 Jan 2010 12:44:24 GMT"
}
] | 2010-01-21T00:00:00 | [
[
"Gogokhia",
"V.",
""
],
[
"Barnafoldi",
"G. G.",
""
]
] |
0708.0164 | Melik Demirel | Melik Demirel, Atul Parikh, Vincent Crespi, Scott Reed | Biologically Inspired Nanomaterials: A Conference Report | 7 pages, 1 figure, conference report | null | null | null | physics.bio-ph physics.soc-ph | null | The understanding of the nanoscale physical properties of biomolecules and
biomaterials will ultimately promote the research in the biological sciences.
In this review, we focused on theory, simulation, and experiments involving
nanoscale materials inspired by biological systems. Specifically, self-assembly
in living and synthetic materials, bio-functionalized nanomaterials and probing
techniques that use nanomaterials are discussed.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 19:41:47 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Demirel",
"Melik",
""
],
[
"Parikh",
"Atul",
""
],
[
"Crespi",
"Vincent",
""
],
[
"Reed",
"Scott",
""
]
] |
0708.0165 | Graciela Boente | Graciela Boente, Xuming He, Jianhui Zhou | Robust estimates in generalized partially linear models | Published at http://dx.doi.org/10.1214/009053606000000858 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 2856-2878 | 10.1214/009053606000000858 | IMS-AOS-AOS0136 | stat.ME | null | In this paper, we introduce a family of robust estimates for the parametric
and nonparametric components under a generalized partially linear model, where
the data are modeled by $y_i|(\mathbf{x}_i,t_i)\sim F(\cdot,\mu_i)$ with
$\mu_i=H(\eta(t_i)+\mathbf{x}_i^{$\mathrm{T}$}\beta)$, for some known
distribution function F and link function H. It is shown that the estimates of
$\beta$ are root-n consistent and asymptotically normal. Through a Monte Carlo
study, the performance of these estimators is compared with that of the
classical ones.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:33:41 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Boente",
"Graciela",
""
],
[
"He",
"Xuming",
""
],
[
"Zhou",
"Jianhui",
""
]
] |
0708.0166 | Michele Frigerio | Michele Frigerio (SPhT, Saclay) and Ernest Ma (UC, Riverside) | Common origin of \theta_{13} and \Delta m^2_{12} in a model of neutrino
mass with quaternion symmetry | revtex, 7 pages, 6 pdf figures; Appendix added discussing in detail
the alignment of VEVs | Phys.Rev.D76:096007,2007 | 10.1103/PhysRevD.76.096007 | SACLAY-T07/110, UCRHEP-T435 | hep-ph hep-ex | null | The smallness of the 1-3 lepton mixing angle $\theta_{13}$ and of the
neutrino mass-squared-difference ratio $\Delta m^2_{12}/\Delta m^2_{23}$ can be
understood as the departure from a common limit where they both vanish. We
discuss in general the conditions for realizing the mass degeneracy of a pair
of neutrinos and show that the vanishing of a CP violating phase is needed. We
find that the discrete quaternion group Q of eight elements is the simplest
family symmetry which correlates the smallness of $\Delta m^2_{12}$ to the
value of $\theta_{13}$. In such a model we predict $0.12\lesssim
\sin\theta_{13} \lesssim 0.2$ if the ordering of the neutrino mass spectrum is
normal, and $\sin\theta_{13}\lesssim 0.12$ if it is inverted.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:44:48 GMT"
},
{
"version": "v2",
"created": "Fri, 2 Nov 2007 12:37:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Frigerio",
"Michele",
"",
"SPhT, Saclay"
],
[
"Ma",
"Ernest",
"",
"UC, Riverside"
]
] |
0708.0167 | Yijun Zuo | Yijun Zuo, Xuming He | On the limiting distributions of multivariate depth-based rank sum
statistics and related tests | Published at http://dx.doi.org/10.1214/009053606000000876 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 2879-2896 | 10.1214/009053606000000876 | IMS-AOS-AOS0140 | math.ST stat.TH | null | A depth-based rank sum statistic for multivariate data introduced by Liu and
Singh [J. Amer. Statist. Assoc. 88 (1993) 252--260] as an extension of the
Wilcoxon rank sum statistic for univariate data has been used in multivariate
rank tests in quality control and in experimental studies. Those applications,
however, are based on a conjectured limiting distribution, provided by Liu and
Singh [J. Amer. Statist. Assoc. 88 (1993) 252--260]. The present paper proves
the conjecture under general regularity conditions and, therefore, validates
various applications of the rank sum statistic in the literature. The paper
also shows that the corresponding rank sum tests can be more powerful than
Hotelling's T^2 test and some commonly used multivariate rank tests in
detecting location-scale changes in multivariate distributions.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:47:41 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Zuo",
"Yijun",
""
],
[
"He",
"Xuming",
""
]
] |
0708.0168 | Junhao Shen | Don Hadwin and Junhao Shen | Topological Free Entropy Dimension in Unital C^* algebras (II) :
Orthogonal Sum of Unital C^*-algebras | null | null | null | null | math.OA | null | In the paper, we obtain a formula for topological free entropy dimension in
the orthogonal sum (or direct sum) of unital C^* algebras. As a corollary, we
compute the topological free entropy dimension of any family of self-adjoint
generators of a finite dimensional C^* algebra.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:59:21 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 14:58:28 GMT"
},
{
"version": "v3",
"created": "Fri, 31 Aug 2007 15:15:50 GMT"
},
{
"version": "v4",
"created": "Wed, 12 Mar 2008 16:07:08 GMT"
}
] | 2008-03-12T00:00:00 | [
[
"Hadwin",
"Don",
""
],
[
"Shen",
"Junhao",
""
]
] |
0708.0169 | Mikhail Langovoy | Mikhail Langovoy | Data-driven goodness-of-fit tests | Fully remastered version of the paper | null | null | null | math.ST math.PR stat.ME stat.TH | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose and study a general method for construction of consistent
statistical tests on the basis of possibly indirect, corrupted, or partially
available observations. The class of tests devised in the paper contains
Neyman's smooth tests, data-driven score tests, and some types of multi-sample
tests as basic examples. Our tests are data-driven and are additionally
incorporated with model selection rules. The method allows to use a wide class
of model selection rules that are based on the penalization idea. In
particular, many of the optimal penalties, derived in statistical literature,
can be used in our tests. We establish the behavior of model selection rules
and data-driven tests under both the null hypothesis and the alternative
hypothesis, derive an explicit detectability rule for alternative hypotheses,
and prove a master consistency theorem for the tests from the class. The paper
shows that the tests are applicable to a wide range of problems, including
hypothesis testing in statistical inverse problems, multi-sample problems, and
nonparametric hypothesis testing.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:54:16 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Sep 2007 10:04:44 GMT"
},
{
"version": "v3",
"created": "Tue, 18 Dec 2007 12:01:41 GMT"
},
{
"version": "v4",
"created": "Thu, 21 Sep 2017 15:20:30 GMT"
}
] | 2017-09-22T00:00:00 | [
[
"Langovoy",
"Mikhail",
""
]
] |
0708.0170 | Volker Perlick | Volker Perlick | On the radar method in general-relativistic spacetimes | Written version of talk given at 359th WE Heraeus Seminar ``Lasers,
Clocks, and Drag-Free. New Technologies for Testing Relativistic Gravity in
Space.'' Bremen, 2005; to appear in H. Dittus, C. L{\"a}mmerzahl, S. G.
Turyshev (eds.): ``Lasers, Clocks, and Drag-Free Control. Exploration of
Relativistic Gravity in Space.'' Springer, 2007 | null | 10.1007/978-3-540-34377-6_5 | null | gr-qc | null | If a clock, mathematically modeled by a parametrized timelike curve in a
general-relativistic spacetime, is given, the radar method assigns a time and a
distance to every event which is sufficiently close to the clock. Several
geometric aspects of this method are reviewed and their physical interpretation
is discussed.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 14:54:52 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Perlick",
"Volker",
""
]
] |
0708.0171 | Jean-Philippe Vert | Pierre Mah\'e (XRCE), Jean-Philippe Vert (CB) | Virtual screening with support vector machines and structure kernels | null | null | null | null | q-bio.QM cs.LG | null | Support vector machines and kernel methods have recently gained considerable
attention in chemoinformatics. They offer generally good performance for
problems of supervised classification or regression, and provide a flexible and
computationally efficient framework to include relevant information and prior
knowledge about the data and problems to be handled. In particular, with kernel
methods molecules do not need to be represented and stored explicitly as
vectors or fingerprints, but only to be compared to each other through a
comparison function technically called a kernel. While classical kernels can be
used to compare vector or fingerprint representations of molecules, completely
new kernels were developed in the recent years to directly compare the 2D or 3D
structures of molecules, without the need for an explicit vectorization step
through the extraction of molecular descriptors. While still in their infancy,
these approaches have already demonstrated their relevance on several toxicity
prediction and structure-activity relationship problems.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 19:13:52 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Mahé",
"Pierre",
"",
"XRCE"
],
[
"Vert",
"Jean-Philippe",
"",
"CB"
]
] |
0708.0172 | Bo-Qiang Ma | Jianghao Yu, Teng Wang, Chueng-Ryong Ji, Bo-Qiang Ma | Zero-Mode Contribution in Nucleon-Delta Transition | 16 latex pages, 7 figures, to appear in PRD | Phys.Rev.D76:074009,2007 | 10.1103/PhysRevD.76.074009 | null | hep-ph | null | We investigate the transition form factors between nucleon and $\Delta$(1232)
particles by using a covariant quark-spectator-diquark field theory model in
(3+1) dimensions. Performing a light-front calculation in parallel with the
manifestly covariant calculation in light-front helicity basis, we examine the
light-front zero-mode contribution to the helicity components of light-front
good ("+") current matrix elements. Choosing the light-front gauge
($\epsilon^+_{h=\pm}=0$) with circular polarization in Drell-Yan-West frame, we
find that only the helicity components $({1\over 2}, {1\over 2})$ and $({1\over
2},-{1\over 2})$ of the good current receive the zero-mode contribution. Taking
into account the zero-mode, we find the prescription independence in obtaining
the light-front solution of form factors from any three helicity matrix
elements with smeared light-front wavefunctions. The angular condition, which
guarantees the full covariance of different schemes, is recovered.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:00:17 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yu",
"Jianghao",
""
],
[
"Wang",
"Teng",
""
],
[
"Ji",
"Chueng-Ryong",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
0708.0173 | Mladen Martinis Dr | M. Martinis, M. Sosic | K-minus Estimator Approach to Large Scale Structure | 26 pages, 8 figures | null | null | null | astro-ph | null | Self similar 3D distributions of point-particles, with a given quasifractal
dimension D, were generated on a Menger sponge model and then compared with
\textit{2dfGRS} and \textit{Virgo project} data
\footnote{http://www.mso.anu.edu.au/2dFGRS/,
http://www.mpa-garching.mpg.de/Virgo/}. Using the principle of local knowledge,
it is argued that in a finite volume of space only the two-point minus
estimator is acceptable in the correlation analysis of self similar spatial
distributions. In this sense, we have simplified the Pietronero-Labini
correlative analysis by defining a K-minus estimator, which when applied to
2dfGRS data revealed the quasifractal dimension $D\approx 2$ as expected. In
our approach the K-minus estimator is used only locally. Dimensions between D =
1 and D = 1.7, as suggested by the standard $\xi (r)$ analysis, were found to
be fallacy of the method. In order to visualize spatial quasifractal objects,
we created a small software program called \textit{RoPo} (''Rotate Points'').
This program illustrates and manifests local correlative analysis in which the
visual inspection emerged as a first step and a key part of the method.
Finally, we discuss importance and perspective of the visual inspection on
available real and simulated distributions. It is also argued that results of
contemporary cosmological simulations do not faithfully represent real data, as
they show a formation of ever increasing collapsars. We consent that 2dfGRS
data are reminiscent of some kind of underlying turbulence like effects in
action.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:01:18 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Martinis",
"M.",
""
],
[
"Sosic",
"M.",
""
]
] |
0708.0174 | Wanda Maria Alberico | P. Czerski, W.M. Alberico, S. Chiacchiera, A. De Pace, H. Hansen, A.
Molinari, M. Nardi | HTL approach to the viscosity of quark plasma | 9 pages, 3 figures | J.Phys.G36:025008,2009 | 10.1088/0954-3899/36/2/025008 | null | hep-ph | null | The quark viscosity in the quark gluon plasma is evaluated in HTL
approximation. The different contributions to the viscosity arising from the
various components of the quark spectral function are discussed. The
calculation is extended to finite values of the chemical potential.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:05:31 GMT"
},
{
"version": "v2",
"created": "Sat, 22 Dec 2007 19:16:24 GMT"
}
] | 2009-10-06T00:00:00 | [
[
"Czerski",
"P.",
""
],
[
"Alberico",
"W. M.",
""
],
[
"Chiacchiera",
"S.",
""
],
[
"De Pace",
"A.",
""
],
[
"Hansen",
"H.",
""
],
[
"Molinari",
"A.",
""
],
[
"Nardi",
"M.",
""
]
] |
0708.0175 | Catia Scricciolo | Catia Scricciolo | Convergence rates for Bayesian density estimation of
infinite-dimensional exponential families | Published at http://dx.doi.org/10.1214/009053606000000911 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 2897-2920 | 10.1214/009053606000000911 | IMS-AOS-AOS0148 | math.ST stat.TH | null | We study the rate of convergence of posterior distributions in density
estimation problems for log-densities in periodic Sobolev classes characterized
by a smoothness parameter p. The posterior expected density provides a
nonparametric estimation procedure attaining the optimal minimax rate of
convergence under Hellinger loss if the posterior distribution achieves the
optimal rate over certain uniformity classes. A prior on the density class of
interest is induced by a prior on the coefficients of the trigonometric series
expansion of the log-density. We show that when p is known, the posterior
distribution of a Gaussian prior achieves the optimal rate provided the prior
variances die off sufficiently rapidly. For a mixture of normal distributions,
the mixing weights on the dimension of the exponential family are assumed to be
bounded below by an exponentially decreasing sequence. To avoid the use of
infinite bases, we develop priors that cut off the series at a
sample-size-dependent truncation point. When the degree of smoothness is
unknown, a finite mixture of normal priors indexed by the smoothness parameter,
which is also assigned a prior, produces the best rate. A rate-adaptive
estimator is derived.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:08:04 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Scricciolo",
"Catia",
""
]
] |
0708.0176 | Arul Lakshminarayan | Arul Lakshminarayan, Steven Tomsovic, Oriol Bohigas, Satya N. Majumdar | Extreme statistics of complex random and quantum chaotic states | 5 pages, 2 figures | Phys. Rev. Lett. 100, 044103 (2008) | 10.1103/PhysRevLett.100.044103 | IITM/PH/TH/2007/11 | quant-ph cond-mat.stat-mech nlin.CD | null | An exact analytical description of extreme intensity statistics in complex
random states is derived. These states have the statistical properties of the
Gaussian and Circular Unitary Ensemble eigenstates of random matrix theory.
Although the components are correlated by the normalization constraint, it is
still possible to derive compact formulae for all values of the dimensionality
N. The maximum intensity result slowly approaches the Gumbel distribution even
though the variables are bounded, whereas the minimum intensity result rapidly
approaches the Weibull distribution. Since random matrix theory is conjectured
to be applicable to chaotic quantum systems, we calculate the extreme
eigenfunction statistics for the standard map with parameters at which its
classical map is fully chaotic. The statistical behaviors are consistent with
the finite-N formulae.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:21:52 GMT"
}
] | 2011-08-02T00:00:00 | [
[
"Lakshminarayan",
"Arul",
""
],
[
"Tomsovic",
"Steven",
""
],
[
"Bohigas",
"Oriol",
""
],
[
"Majumdar",
"Satya N.",
""
]
] |
0708.0177 | Mihaela Aslan | Mihaela Aslan | Asymptotically minimax Bayes predictive densities | Published at http://dx.doi.org/10.1214/009053606000000885 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 2921-2938 | 10.1214/009053606000000885 | IMS-AOS-AOS0142 | math.ST stat.TH | null | Given a random sample from a distribution with density function that depends
on an unknown parameter $\theta$, we are interested in accurately estimating
the true parametric density function at a future observation from the same
distribution. The asymptotic risk of Bayes predictive density estimates with
Kullback--Leibler loss function $D(f_{\theta}||{\hat{f}})=\int{f_{\theta}
\log{(f_{\theta}/ hat{f})}}$ is used to examine various ways of choosing prior
distributions; the principal type of choice studied is minimax. We seek
asymptotically least favorable predictive densities for which the corresponding
asymptotic risk is minimax. A result resembling Stein's paradox for estimating
normal means by the maximum likelihood holds for the uniform prior in the
multivariate location family case: when the dimensionality of the model is at
least three, the Jeffreys prior is minimax, though inadmissible. The Jeffreys
prior is both admissible and minimax for one- and two-dimensional location
problems.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:23:44 GMT"
}
] | 2009-09-29T00:00:00 | [
[
"Aslan",
"Mihaela",
""
]
] |
0708.0178 | Volker Perlick | Volker Perlick | Theoretical gravitational lensing. Beyond the weak-field small-angle
approximation | 20 pages, 9 figures; extended written version of rapporteur talk,
given at the workshop on ``Theoretical Gravitational Lensing'' at the 11th
Marcel Grossmann Meeting, Berlin, 2006 | null | 10.1142/9789812834300_0030 | null | gr-qc | null | An overview is given on those theoretical gravitational lensing results that
can be formulated in a spacetime setting, without assuming that the
gravitational fields are weak and that the bending angles are small. The first
part is devoted to analytical methods considering spacetimes in which the
equations for light rays (lightlike geodesics) is completely integrable. This
includes spherically symmetric static spacetimes, the Kerr spacetime and plane
gravitational waves. The second part is devoted to qualitative methods which
give some information on lensing properties without actually solving the
equation for lightlike geodesics. This includes Morse theory, methods from
differential topology and bifurcation theory.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:31:22 GMT"
}
] | 2016-11-15T00:00:00 | [
[
"Perlick",
"Volker",
""
]
] |
0708.0179 | Katherine Holman | K. L. Holman, E. Morosan, P. A. Casey, Lu Li, N.P. Ong, T. Klimczuk,
C. Felser and R. J. Cava | Crystal Structure and Physical Properties of Mg6Cu16Si7-type M6Ni16Si7,
for M = Mg, Sc, Ti, Nb, and Ta | 9 pages, 6 figures, 1 table. 2 Authors added. Includes extra figure
with accompanying text and references | null | null | null | cond-mat.supr-con cond-mat.mtrl-sci | null | Five compounds were investigated for magnetic character and
superconductivity, all with non-magnetic nickel and band structures containing
flat bands and steep bands. The syntheses and crystal structures, refined by
powder X-ray diffraction, are reported for M6Ni16Si7, where M = Mg, Sc, Ti, Nb,
and Ta. All compounds form in the Mg6Cu16Si7 structure type. Resistance
measurements are also reported on M6Ni16Si7 (M = Mg, Sc, Ti, and Nb) down to
0.3 K, with all four showing metallic conductivity. No superconductivity is
observed. Magnetization measurements for all compounds reveal essentially
temperature independent paramagnetism, with a tendency toward more enhanced low
temperature paramagnetism for the cases of Mg6Ni16Si7 and Sc6Ni16Si7.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:42:47 GMT"
},
{
"version": "v2",
"created": "Wed, 15 Aug 2007 23:07:33 GMT"
}
] | 2007-08-16T00:00:00 | [
[
"Holman",
"K. L.",
""
],
[
"Morosan",
"E.",
""
],
[
"Casey",
"P. A.",
""
],
[
"Li",
"Lu",
""
],
[
"Ong",
"N. P.",
""
],
[
"Klimczuk",
"T.",
""
],
[
"Felser",
"C.",
""
],
[
"Cava",
"R. J.",
""
]
] |
0708.0180 | Fernando de Melo | Thomas Konrad, Fernando de Melo, Markus Tiersch, Christian Kasztelan,
Adriano Aragao and Andreas Buchleitner | A Factorization Law for Entanglement Decay | 4 pages, 5 figures | Nature Physics 4, 99 - 102 (2008) | 10.1038/nphys885 | null | quant-ph | null | We present a simple and general factorization law for quantum systems shared
by two parties, which describes the time evolution of entanglement upon passage
of either component through an arbitrary noisy channel. The robustness of
entanglement-based quantum information processing protocols is thus easily and
fully characterized by a single quantity.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:43:01 GMT"
},
{
"version": "v2",
"created": "Thu, 2 Aug 2007 18:46:23 GMT"
},
{
"version": "v3",
"created": "Thu, 20 Sep 2007 12:02:11 GMT"
}
] | 2008-02-19T00:00:00 | [
[
"Konrad",
"Thomas",
""
],
[
"de Melo",
"Fernando",
""
],
[
"Tiersch",
"Markus",
""
],
[
"Kasztelan",
"Christian",
""
],
[
"Aragao",
"Adriano",
""
],
[
"Buchleitner",
"Andreas",
""
]
] |
0708.0181 | Eduardo Candelario-Jalil | E Candelario-Jalil, A Gonzalez-Falcon, M Garcia-Cabrera, OS Leon, BL
Fiebich | Post-ischaemic treatment with the cyclooxygenase-2 inhibitor nimesulide
reduces blood-brain barrier disruption and leukocyte infiltration following
transient focal cerebral ischaemia in rats | null | Journal of Neurochemistry 100(4): 1108-1120 (2007) | null | null | q-bio.NC q-bio.TO | null | Several studies suggest that cyclooxygenase (COX)-2 plays a pivotal role in
the progression of ischaemic brain damage. In the present study, we
investigated the effects of selective inhibition of COX-2 with nimesulide (12
mg/kg) and selective inhibition of COX-1 with valeryl salicylate (VAS, 12-120
mg/kg) on prostaglandin E2 (PGE2) levels, myeloperoxidase (MPO) activity, Evans
blue (EB) extravasation and infarct volume in a standardized model of transient
focal cerebral ischaemia in the rat. Post-ischaemic treatment with nimesulide
markedly reduced the increase in PGE2 levels in the ischaemic cerebral cortex
24 h after stroke and diminished infarct size by 48% with respect to
vehicle-treated animals after 3 days of reperfusion. Furthermore, nimesulide
significantly attenuated the blood-brain barrier (BBB) damage and leukocyte
infiltration (as measured by EB leakage and MPO activity, respectively) seen at
48 h after the initial ischaemic episode. These studies provide the first
experimental evidence that COX-2 inhibition with nimesulide is able to limit
BBB disruption and leukocyte infiltration following transient focal cerebral
ischaemia. Neuroprotection afforded by nimesulide is observed even when the
treatment is delayed until 6 h after the onset of ischaemia, confirming a wide
therapeutic window of COX-2 inhibitors in experimental stroke. On the contrary,
selective inhibition of COX-1 with VAS had no significant effect on the
evaluated parameters. These data suggest that COX-2 activity, but not COX-1
activity, contributes to the progression of focal ischaemic brain injury, and
that the beneficial effects observed with non-selective COX inhibitors are
probably associated to COX-2 rather than to COX-1 inhibition.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:47:39 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Candelario-Jalil",
"E",
""
],
[
"Gonzalez-Falcon",
"A",
""
],
[
"Garcia-Cabrera",
"M",
""
],
[
"Leon",
"OS",
""
],
[
"Fiebich",
"BL",
""
]
] |
0708.0182 | Riccardo Faccini | The BABAR Collaboration: B. Aubert, et al | Search for b--> u transitions in B- -> [K+pi-pi0]_D K- | 4 pages, 10 postscript figues, submitted to Physical Review Letters | Phys.Rev.D76:111101,2007 | 10.1103/PhysRevD.76.111101 | BABAR-PUB-07/030, SLAC-PUB-12694 | hep-ex | null | We search for decays of a B meson into a neutral D meson and a kaon, with the
D meson decaying into K+pi-pi0. This final state can be reached through the b
--> c transition B- -> D0K- followed by the doubly Cabibbo-suppressed D0 -->
K+pi-pi0, or the b --> u transition B- --> D0bar K- followed by the
Cabibbo-favored D0bar --> K+ pi-pi 0. The interference of these two amplitudes
is sensitive to the angle gamma of the unitarity triangle. We present
preliminary results based on 226 10^{6} e+e- --> Y(4s) --> BBbar events
collected with the BABAR detector at SLAC. We find no significant evidence for
these decays and we set a limit R_ADS =(BR(B- -->[K+pi-pi0]_D K-)+ BR(B+ -->
[K-pi+pi0]_D K+))/(BR(B- -->[K-p i+pi0]_D K-)+ BR(B+ --> [K+pi-pi0]_D
K+))<0.039 at 95% confidence level, which we translate with a Bayesian approach
into r_B = |A(B- --> D0bar K-)|/|A(B- --> D0bar K-)| < 0.185 at 95% confidence
level.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:48:45 GMT"
}
] | 2010-04-12T00:00:00 | [
[
"The BABAR Collaboration",
"",
""
],
[
"Aubert",
"B.",
""
]
] |
0708.0183 | Ronald Cohen | Xianwei Sha and R. E. Cohen | First-principles thermal equation of state and thermoelasticity for hcp
Fe under high pressures | null | null | null | null | cond-mat.other | null | We investigate the equation of state and elastic properties of nonmagnetic
hcp iron at high pressures and high temperatures using the first principles
linear response linear-muffin-tin-orbital method in the generalized-gradient
approximation. We calculate the Helmholtz free energy as a function of volume,
temperature, and volume-constrained strain, including the electronic excitation
contributions from band structures and lattice vibrational contributions from
quasi-harmonic lattice dynamics. We perform detailed investigations on the
behavior of elastic moduli and equation of state properties as a function of
temperature and pressure, including the pressure-volume equation of state, bulk
modulus, the thermal expansion coefficient, the Gruneisen ratio, and the shock
Hugoniots. A detailed comparison has been made with available experimental
measurements and theoretical predictions.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:49:00 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Sha",
"Xianwei",
""
],
[
"Cohen",
"R. E.",
""
]
] |
0708.0184 | Domenico D'Alessandro | Domenico D'Alessandro, Gianfranco Parlangeli and Francesca Albertini | Non-stationary quantum walks on the cycle | Revised version with minor changes | J. Phys. A Math. Theor. (2007) 40 14447-14455 | 10.1088/1751-8113/40/48/010 | null | quant-ph | null | We consider quantum walks on the cycle in the non-stationary case where the
`coin' operation is allowed to change at each time step. We characterize, in
algebraic terms, the set of possible state transfers and prove that, as opposed
to the stationary case, it is possible to asymnptotically reach a uniform
distribution among the nodes of the associated graph.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 15:54:04 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Apr 2008 16:53:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"D'Alessandro",
"Domenico",
""
],
[
"Parlangeli",
"Gianfranco",
""
],
[
"Albertini",
"Francesca",
""
]
] |
0708.0185 | Willa W. Chen | Willa W. Chen, Clifford M. Hurvich | Semiparametric estimation of fractional cointegrating subspaces | Published at http://dx.doi.org/10.1214/009053606000000894 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 2939-2979 | 10.1214/009053606000000894 | IMS-AOS-AOS0144 | math.ST stat.TH | null | We consider a common-components model for multivariate fractional
cointegration, in which the $s\geq1$ components have different memory
parameters. The cointegrating rank may exceed 1. We decompose the true
cointegrating vectors into orthogonal fractional cointegrating subspaces such
that vectors from distinct subspaces yield cointegrating errors with distinct
memory parameters. We estimate each cointegrating subspace separately, using
appropriate sets of eigenvectors of an averaged periodogram matrix of tapered,
differenced observations, based on the first $m$ Fourier frequencies, with $m$
fixed. The angle between the true and estimated cointegrating subspaces is
$o_p(1)$. We use the cointegrating residuals corresponding to an estimated
cointegrating vector to obtain a consistent and asymptotically normal estimate
of the memory parameter for the given cointegrating subspace, using a
univariate Gaussian semiparametric estimator with a bandwidth that tends to
$\infty$ more slowly than $n$. We use these estimates to test for fractional
cointegration and to consistently identify the cointegrating subspaces.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:02:40 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Chen",
"Willa W.",
""
],
[
"Hurvich",
"Clifford M.",
""
]
] |
0708.0186 | Eduardo Candelario-Jalil | E. Candelario-Jalil, H. Slawik, I. Ridelis, A. Waschbisch, R.S.
Akundi, M. Hull, B.L. Fiebich | Regional distribution of the prostaglandin E2 receptor EP1 in the rat
brain: accumulation in Purkinje cells of the cerebellum | null | Journal of Molecular Neuroscience 27(3): 303-310 (2005) | null | null | q-bio.TO | null | Prostaglandin E2 (PGE2), is a major prostanoid produced by the activity of
cyclooxygenases (COX) in response to various physiological and pathological
stimuli. PGE2 exerts its effects by activating four specific E-type prostanoid
receptors (EP1, EP2, EP3, and EP4). In the present study, we analyzed the
expression of the PGE2 receptor EP1 (mRNA and protein) in different regions of
the adult rat brain (hippocampus, hypothalamus, striatum, prefrontal cerebral
cortex, parietal cortex, brain stem, and cerebellum) using reverse
transcription- polymerase chain reaction, Western blotting, and
immunohistochemical methods. On a regional basis, levels of EP1 mRNA were the
highest in parietal cortex and cerebellum. At the protein level, we found very
strong expression of EP1 in cerebellum, as revealed by Western blotting
experiments. Furthermore, the present study provides for the first time
evidence that the EP1 receptor is highly expressed in the cerebellum, where the
Purkinje cells displayed very high immunolabeling of their perikaryon and
dendrites, as observed in the immunohistochemical analysis. Results from the
present study indicate that the EP1 prostanoid receptor is expressed in
specific neuronal populations, which possibly determine the region-specific
response to PGE2.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:02:56 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Candelario-Jalil",
"E.",
""
],
[
"Slawik",
"H.",
""
],
[
"Ridelis",
"I.",
""
],
[
"Waschbisch",
"A.",
""
],
[
"Akundi",
"R. S.",
""
],
[
"Hull",
"M.",
""
],
[
"Fiebich",
"B. L.",
""
]
] |
0708.0187 | Eduardo Candelario-Jalil | E. Candelario-Jalil, A. Gonzalez-Falcon, M. Garcia-Cabrera, O. S.
Leon, B. L. Fiebich | Wide therapeutic time window for nimesulide neuroprotection in a model
of transient focal cerebral ischemia in the rat | null | Brain Research 1007(1-2): 98-108 (2004) | null | null | q-bio.NC q-bio.TO | null | Results from several studies indicate that cyclooxygenase-2 (COX-2) is
involved in ischemic brain injury. The purpose of this study was to evaluate
the neuroprotective effects of the selective COX-2 inhibitor nimesulide on
cerebral infarction and neurological deficits in a standardized model of
transient focal cerebral ischemia in rats. Three doses of nimesulide (3, 6 and
12 mg/kg; i.p.) or vehicle were administered immediately after stroke and
additional doses were given at 6, 12, 24, 36 and 48 h after ischemia. In other
set of experiments, the effect of nimesulide was studied in a situation in
which its first administration was delayed for 3-24 h after ischemia. Total,
cortical and subcortical infarct volumes and functional outcome (assessed by
neurological deficit score and rotarod performance) were determined 3 days
after ischemia. The effect of nimesulide on prostaglandin E(2) (PGE(2)) levels
in the injured brain was also investigated. Nimesulide dose-dependently reduced
infarct volume and improved functional recovery when compared to vehicle. Of
interest is the finding that neuroprotection conferred by nimesulide (reduction
of infarct size and neurological deficits and improvement of rotarod
performance) was also observed when treatment was delayed until 24 h after
ischemia. Further, administration of nimesulide in a delayed treatment paradigm
completely abolished PGE(2) accumulation in the postischemic brain, suggesting
that COX-2 inhibition is a promising therapeutic strategy for cerebral ischemia
to target the late-occurring inflammatory events which amplify initial damage.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:09:39 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Candelario-Jalil",
"E.",
""
],
[
"Gonzalez-Falcon",
"A.",
""
],
[
"Garcia-Cabrera",
"M.",
""
],
[
"Leon",
"O. S.",
""
],
[
"Fiebich",
"B. L.",
""
]
] |
0708.0188 | Volker Eyert | S. F. Matar, J. F. Riecken, B. Chevalier, R. Poettgen, and V. Eyert | First principles investigations of the electronic, magnetic and chemical
bonding properties of CeTSn (T=Rh,Ru) | 6 pages, 7 figures, for more information see
http://www.physik.uni-augsburg.de/~eyert/ | Phys. Rev. B 76, 174434 (2007) | 10.1103/PhysRevB.76.174434 | null | cond-mat.str-el cond-mat.mtrl-sci | null | The electronic structures of CeRhSn and CeRuSn are self-consistently
calculated within density functional theory using the local spin density
approximation for exchange and correlation. In agreement with experimental
findings, the analyses of the electronic structures and of the chemical bonding
properties point to the absence of magnetization within the mixed valent Rh
based system while a finite magnetic moment is observed for trivalent cerium
within the Ru-based stannide, which contains both trivalent and intermediate
valent Ce.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:10:02 GMT"
}
] | 2008-01-26T00:00:00 | [
[
"Matar",
"S. F.",
""
],
[
"Riecken",
"J. F.",
""
],
[
"Chevalier",
"B.",
""
],
[
"Poettgen",
"R.",
""
],
[
"Eyert",
"V.",
""
]
] |
0708.0189 | Agnieszka Sierpowska-Bartosik PhD | Agnieszka Sierpowska-Bartosik, Diego F. Torres | Pulsar model of the high energy phenomenology of LS 5039 | Figures and results are unchanged. Some new text and new references | Astrophys.J.671:L145-L148,2007 | 10.1086/525041 | null | astro-ph | null | Under the assumption that LS 5039 is a system composed by a pulsar rotating
around an O6.5V star in a $\sim 3.9$ day orbit, we present the results of a
theoretical modeling of the high energy phenomenology observed by the High
Energy Stereoscopy Array (H.E.S.S.). This model (including detailed account of
the system geometry, Klein-Nishina inverse Compton, $\gamma$-$\gamma$
absorption, and cascading) is able to describe well the rich observed
phenomenology found in the system at all timescales, both flux and
spectrum-wise.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:15:11 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 10:51:44 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sierpowska-Bartosik",
"Agnieszka",
""
],
[
"Torres",
"Diego F.",
""
]
] |
0708.0190 | Zs\'ofia Bogn\'ar | Zs. Bogn\'ar (1), M. Papar\'o (1), B. Steininger (2), G. Vir\'aghalmy
(1) ((1) Konkoly Observatory, Budapest, Hungary, (2) Institute of Astronomy,
University of Vienna, Vienna, Austria) | GD 99 - an unusual, rarely observed DAV white dwarf | 2 pages, 1 eps figure; has been accepted for publication in
Communications in Asteroseismology (Vol. 150, 2007), Proceedings of the
Vienna Workshop on the Future of Asteroseismology | null | 10.1553/cia150s251 | null | astro-ph | null | New observations of GD 99 are analysed. The unusual pulsation behaviour,
showing both long and short periods, has been confirmed. All the available
periods show a grouping of short and long period modes with roughly regular
spacing. If we interpret the groups separately, a binary nature can be a
possible explanation as in the similar cases of WD 2350-0054 and G29-38.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:24:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bognár",
"Zs.",
""
],
[
"Paparó",
"M.",
""
],
[
"Steininger",
"B.",
""
],
[
"Virághalmy",
"G.",
""
]
] |
0708.0191 | Helmut Katzgraber | A. Fabricio Albuquerque, Helmut G. Katzgraber, Matthias Troyer, Gianni
Blatter | Engineering exotic phases for topologically-protected quantum
computation by emulating quantum dimer models | 12 pages, 10 figures | Phys. Rev. B 78, 014503 (2008) | 10.1103/PhysRevB.78.014503 | null | cond-mat.other cond-mat.str-el | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a nonperturbative extended contractor renormalization (ENCORE) method
for engineering quantum devices for the implementation of topologically
protected quantum bits described by an effective quantum dimer model on the
triangular lattice. By tuning the couplings of the device, topological
protection might be achieved if the ratio between effective two-dimer
interactions and flip amplitudes lies in the liquid phase of the phase diagram
of the quantum dimer model. For a proposal based on a quantum Josephson
junction array [L. B. Ioffe {\it et al.}, Nature (London) {\bf 415}, 503
(2002)] our results show that optimal operational temperatures below 1 mK can
only be obtained if extra interactions and dimer flips, which are not present
in the standard quantum dimer model and involve three or four dimers, are
included. It is unclear if these extra terms in the quantum dimer Hamiltonian
destroy the liquid phase needed for quantum computation. Minimizing the effects
of multi-dimer terms would require energy scales in the nano-Kelvin regime. An
alternative implementation based on cold atomic or molecular gases loaded into
optical lattices is also discussed, and it is shown that the small energy
scales involved--implying long operational times--make such a device
impractical. Given the many orders of magnitude between bare couplings in
devices, and the topological gap, the realization of topological phases in
quantum devices requires careful engineering and large bare interaction scales.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:14:54 GMT"
},
{
"version": "v2",
"created": "Thu, 3 Jul 2008 13:41:36 GMT"
}
] | 2008-07-03T00:00:00 | [
[
"Albuquerque",
"A. Fabricio",
""
],
[
"Katzgraber",
"Helmut G.",
""
],
[
"Troyer",
"Matthias",
""
],
[
"Blatter",
"Gianni",
""
]
] |
0708.0192 | Klaus Mecke | Susan Sporer, Christian Goll and Klaus Mecke | Motion by Stopping: Rectifying Brownian Motion of Non-spherical
Particles | 11 pages, 5 figures | null | 10.1103/PhysRevE.78.011917 | null | cond-mat.soft | null | We show that Brownian motion is spatially not symmetric for mesoscopic
particles embedded in a fluid if the particle is not in thermal equilibrium and
its shape is not spherical. In view of applications on molecular motors in
biological cells, we sustain non-equilibrium by stopping a non-spherical
particle at periodic sites along a filament. Molecular dynamics simulations in
a Lennard-Jones fluid demonstrate that directed motion is possible without a
ratchet potential or temperature gradients if the asymmetric non-equilibrium
relaxation process is hindered by external stopping. Analytic calculations in
the ideal gas limit show that motion even against a fluid drift is possible and
that the direction of motion can be controlled by the shape of the particle,
which is completely characterized by tensorial Minkowski functionals.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:39:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Sporer",
"Susan",
""
],
[
"Goll",
"Christian",
""
],
[
"Mecke",
"Klaus",
""
]
] |
0708.0193 | Rosa A. Gonzalez | Rosa A. Gonzalez-Lopezlira (CRyA-UNAM, Morelia, Mexico) and A. Buzzoni
(INAF - Osservatorio Astronomico di Bologna, Bologna, Italy) | UV excess and AGB evolution in elliptical-galaxy stellar populations | 6 pages, LaTeX, 4 figures, uses svmult.cls. To appear in``Ultraviolet
properties of evolved stellar populations", ed. M. Chavez, E. Bertone, D.
Rosa-Gonzalez, and L.H. Rodriguez-Merino, Astrophysics and Space Science
Proceedings (Dordrecht:Springer), in press | null | null | null | astro-ph | null | The puzzling origin of the ``UV-upturn'' phenomenon, observed in some
elliptical galaxies, has recently been settled by identifying hot HB stars as
main contributors to galaxy ultraviolet luminosity excess. While a blue HB
morphology seems a natural characteristic of metal-poor stellar populations,
its appearence in metal-rich systems, often coupled with a poorer rate of
planetary nebulae per unit galaxy luminosity, might be calling for an intimate
connection between UV excess and AGB properties in early-type galaxies. In this
work, we want to briefly assess this issue, relying on infrared surface
brightness fluctuations as a powerful tool to trace AGB properties in external
galaxies with unresolved stellar populations.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:39:34 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Gonzalez-Lopezlira",
"Rosa A.",
"",
"CRyA-UNAM, Morelia, Mexico"
],
[
"Buzzoni",
"A.",
"",
"INAF - Osservatorio Astronomico di Bologna, Bologna, Italy"
]
] |
0708.0194 | Adriana P\'alffy | Adriana P\'alffy, J\"org Evers and Christoph H. Keitel | Isomer triggering via nuclear excitation by electron capture | minor changes - updated to the final version; 4 pages, 1 figure | Phys.Rev.Lett.99:172502,2007 | 10.1103/PhysRevLett.99.172502 | null | nucl-th physics.atom-ph | null | Triggering of long-lived nuclear isomeric states via coupling to the atomic
shells in the process of nuclear excitation by electron capture (NEEC) is
studied. NEEC occurring in highly-charged ions can excite the isomeric state to
a triggering level that subsequently decays to the ground state. We present
total cross sections for NEEC isomer triggering considering experimentally
confirmed low-lying triggering levels and reaction rates based on realistic
experimental parameters in ion storage rings. A comparison with other isomer
triggering mechanisms shows that, among these, NEEC is the most efficient.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:46:05 GMT"
},
{
"version": "v2",
"created": "Tue, 30 Oct 2007 09:36:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Pálffy",
"Adriana",
""
],
[
"Evers",
"Jörg",
""
],
[
"Keitel",
"Christoph H.",
""
]
] |
0708.0195 | Andrei Tokovinin | A. Tokovinin, V. Kornilov | Accurate seeing measurements with MASS and DIMM | 13 pages, 14 figures. Accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12307.x | null | astro-ph | null | Astronomical seeing is quantified by a single parameter, turbulence integral,
in the framework of the Kolmogorov turbulence model. This parameter can be
routinely measured by a Differential Image Motion Monitor, DIMM. A new
instrument, Multi-Aperture Scintillation Sensor (MASS), permits to measure the
seeing in the free atmosphere above ~0.5km and, together with a DIMM, to
estimate the ground-layer seeing. The absolute accuracy of both methods is
studied here using analytical theory, numerical simulation, and experiments. A
modification of the MASS data processing to compensate for partially saturated
scintillation is developed. We find that the DIMM can be severely biased by
optical aberrations (e.g. defocus) and propagation. Seeing measurements with
DIMM and MASS can reach absolute accuracy of ~10% when their biases are
carefully controlled. Pushing this limit to 1% appears unrealistic because the
seeing itself is just a model-dependent parameter of a non-stationary random
process.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:56:39 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tokovinin",
"A.",
""
],
[
"Kornilov",
"V.",
""
]
] |
0708.0196 | Zs\'ofia Bogn\'ar | Zs. Bogn\'ar (1), M. Papar\'o (1), A. M\'ar (2), Gy. Kerekes (2), P.
P\'apics (2), L. Moln\'ar (1,2), E. Plachy (2), N. Sztank\'o (2), E. Bokor
(2) ((1) Konkoly Observatory, Budapest, Hungary; (2) E\"otv\"os Lor\'and
University Faculty of Science, Budapest, Hungary) | More frequencies of KUV 02464+3239 | 3 pages, 3 eps figures; has been accepted for publication in
Astronomische Nachrichten (Vol. 8, 2007), proceedings of the
British-Hungarian-French N+N+N Workshop for Young Researchers | null | 10.1002/asna.200710816 | null | astro-ph | null | Preliminary results on KUV 02464+3239, a pulsating DA white dwarf are
presented. Located near the red edge of the DAV instability strip, KUV
02464+3239 shows large amplitude and long period pulsation modes. Up to now
only one mode was known from a 50-minute-long light curve. Our more extended
observations allowed the identification of three additional frequencies. The
presence of previously known harmonics were confirmed and weak subharmonics are
also noticeable at some parts of the light curve. This suggests the dominance
of nonlinear pulsation effects from time to time.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 16:56:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bognár",
"Zs.",
""
],
[
"Paparó",
"M.",
""
],
[
"Már",
"A.",
""
],
[
"Kerekes",
"Gy.",
""
],
[
"Pápics",
"P.",
""
],
[
"Molnár",
"L.",
""
],
[
"Plachy",
"E.",
""
],
[
"Sztankó",
"N.",
""
],
[
"Bokor",
"E.",
""
]
] |
0708.0197 | Daniel J. Nordman | Daniel J. Nordman, Soumendra N. Lahiri | A frequency domain empirical likelihood for short- and long-range
dependence | Published at http://dx.doi.org/10.1214/009053606000000902 in the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org) | Annals of Statistics 2006, Vol. 34, No. 6, 3019-3050 | 10.1214/009053606000000902 | IMS-AOS-AOS0146 | math.ST stat.TH | null | This paper introduces a version of empirical likelihood based on the
periodogram and spectral estimating equations. This formulation handles
dependent data through a data transformation (i.e., a Fourier transform) and is
developed in terms of the spectral distribution rather than a time domain
probability distribution. The asymptotic properties of frequency domain
empirical likelihood are studied for linear time processes exhibiting both
short- and long-range dependence. The method results in likelihood ratios which
can be used to build nonparametric, asymptotically correct confidence regions
for a class of normalized (or ratio) spectral parameters, including
autocorrelations. Maximum empirical likelihood estimators are possible, as well
as tests of spectral moment conditions. The methodology can be applied to
several inference problems such as Whittle estimation and goodness-of-fit
testing.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:01:53 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Nordman",
"Daniel J.",
""
],
[
"Lahiri",
"Soumendra N.",
""
]
] |
0708.0198 | Michael Jura | B. Zuckerman (1), D. Koester (2), C. Melis (1), B. Hansen (1), M. Jura
(1) ((1) UCLA, (2) University of Kiel) | The Chemical Composition of an Extrasolar Minor Planet | ApJ, in press | null | 10.1086/522223 | null | astro-ph | null | We report the relative abundances of 17 elements in the atmosphere of the
white dwarf star GD 362, material that, very probably, was contained previously
in a large asteroid or asteroids with composition similar to the Earth/Moon
system. The asteroid may have once been part of a larger parent body not unlike
one of the terrestrial planets of our solar system.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:02:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zuckerman",
"B.",
"",
"UCLA"
],
[
"Koester",
"D.",
"",
"University of Kiel"
],
[
"Melis",
"C.",
"",
"UCLA"
],
[
"Hansen",
"B.",
"",
"UCLA"
],
[
"Jura",
"M.",
"",
"UCLA"
]
] |
0708.0199 | Alfredo Valcarce | H. Garcilazo, A. Valcarce, T. Fernandez-Carames | $\Lambda NN$ and $\Sigma NN$ systems at threshold: II. The effect of D
waves | 19 pages, 4 tables, 6 figures. Accepted for publication in Phys. Rev.
C | Phys.Rev.C76:034001,2007 | 10.1103/PhysRevC.76.034001 | null | hep-ph nucl-th | null | Using the two-body interactions obtained from a chiral constituent quark
model we study all $\Lambda NN$ and $\Sigma NN$ states with I=0,1,2 and
J=1/2,3/2 at threshold, taking into account all three-body configurations with
S and D wave components. We constrain further the limits for the $\Lambda N$
spin-triplet scattering length a_{1/2,1}. Using the hypertriton binding energy
we find a narrow interval for the possible values of the $\Lambda N$
spin-singlet scattering length a_{1/2,0}. We found that the $\Sigma NN$ system
has a quasibound state in the (I,J) = (1,1/2) channel very near threshold with
a width of about 2.1 MeV.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:17:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Garcilazo",
"H.",
""
],
[
"Valcarce",
"A.",
""
],
[
"Fernandez-Carames",
"T.",
""
]
] |
0708.0200 | Morten Heine S{\o}rensen | Morten Heine S{\o}rensen | A Note on Shortest Developments | null | Logical Methods in Computer Science, Volume 3, Issue 4 (November
5, 2007) lmcs:838 | 10.2168/LMCS-3(4:2)2007 | null | cs.LO | null | De Vrijer has presented a proof of the finite developments theorem which, in
addition to showing that all developments are finite, gives an effective
reduction strategy computing longest developments as well as a simple formula
computing their length.
We show that by applying a rather simple and intuitive principle of duality
to de Vrijer's approach one arrives at a proof that some developments are
finite which in addition yields an effective reduction strategy computing
shortest developments as well as a simple formula computing their length. The
duality fails for general beta-reduction.
Our results simplify previous work by Khasidashvili.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:22:48 GMT"
},
{
"version": "v2",
"created": "Mon, 5 Nov 2007 09:48:05 GMT"
}
] | 2015-07-01T00:00:00 | [
[
"Sørensen",
"Morten Heine",
""
]
] |
0708.0201 | Alexander Popov | Alexander K. Popov, Sergey A. Myslivets, Thomas F. George and Vladimir
M. Shalaev | Four-wave mixing, quantum control and compensating losses in doped
negative-index photonic metamaterials | 3 pages, 3 figures, LaTeX, corrected typos in eqs. (1) and (2) | Optics Letters vol. 32, No 20, October 15, 2007, pp. 3044-3046 | 10.1364/OL.32.003044 | null | quant-ph physics.optics | null | The possibility of compensating absorption in negative-index metatamterials
(NIMs) doped by resonant nonlinear-optical centers is shown. The role of
quantum interference and extraordinary properties of four-wave parametric
amplification of counter-propagating electromagnetic waves in NIMs are
discussed.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:31:36 GMT"
},
{
"version": "v2",
"created": "Mon, 13 Aug 2007 16:56:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Popov",
"Alexander K.",
""
],
[
"Myslivets",
"Sergey A.",
""
],
[
"George",
"Thomas F.",
""
],
[
"Shalaev",
"Vladimir M.",
""
]
] |
0708.0202 | B\'ela Csaba | B\'ela Csaba | Regular spanning subgraphs of bipartite graphs of high minimum degree | submitted | null | null | null | math.CO | null | Let G be a simple balanced bipartite graph on $2n$ vertices, $\delta =
\delta(G)/n$, and $\rho={\delta + \sqrt{2 \delta -1} \over 2}$. If $\delta >
1/2$ then it has a $\lfloor \rho n \rfloor$-regular spanning subgraph. The
statement is nearly tight.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:35:10 GMT"
},
{
"version": "v2",
"created": "Sat, 13 Oct 2007 19:35:39 GMT"
}
] | 2007-10-13T00:00:00 | [
[
"Csaba",
"Béla",
""
]
] |
0708.0203 | Cinzia De Donato | C. De Donato (1), G. A. Medina-Tanco (2) ((1) Dipartimento di Fisica
dell'Universit\`a degli Studi di Milano and INFN, Milano, Italy (2) Dep.
Altas Energias, Inst. de Ciencias Nucleares, Universidad Nacional Autonoma de
Mexico, Mexico DF) | The end of the Galactic spectrum | 4 pages, 7 figures, Proceeding of the 30th International Cosmic Ray
Conference, Merida (2007), Yucatan, Mexico | null | null | null | astro-ph | null | We use a diffusion galactic model to analyze the end of the Galactic cosmic
ray spectrum and its mixing with the extragalactic cosmic ray flux. We analyze
the transition between Galactic and extragalactic components using two
different extragalactic models. We compare the sum of the diffusive galactic
spectrum and extragalactic spectrum with the available experimental data.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:38:21 GMT"
},
{
"version": "v2",
"created": "Thu, 18 Oct 2007 08:00:02 GMT"
}
] | 2007-10-18T00:00:00 | [
[
"De Donato",
"C.",
""
],
[
"Medina-Tanco",
"G. A.",
""
]
] |
0708.0204 | Karl G. Sandeman | J.B.A. Hamer (1), R. Daou (1), S. \"Ozcan (1), N.D. Mathur (2), D.J.
Fray (2) and K.G. Sandeman (2) ((1) Cavendish Laboratory, University of
Cambridge, UK, (2) Dept. of Materials Science and Metallurgy, University of
Cambridge, UK) | Phase diagram and magnetocaloric effect of CoMnGe_{1-x}Sn_{x} alloys | 12 pages, 5 figures | Journal of Magnetism and Magnetic Materials, 321, 3535 (2009) | 10.1016/j.jmmm.2008.03.003 | null | cond-mat.mtrl-sci cond-mat.str-el | null | We propose the phase diagram of a new pseudo-ternary compound,
CoMnGe_{1-x}Sn_{x}, in the range x less than or equal to 0.1. Our phase diagram
is a result of magnetic and calometric measurements. We demonstrate the
appearance of a hysteretic magnetostructural phase transition in the range
x=0.04 to x=0.055, similar to that observed in CoMnGe under hydrostatic
pressure. From magnetisation measurements, we show that the isothermal entropy
change associated with the magnetostructural transition can be as high as 4.5
J/(K kg) in a field of 1 Tesla. However, the large thermal hysteresis in this
transition (~20 K) will limit its straightforward use in a magnetocaloric
device.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 17:45:04 GMT"
}
] | 2009-08-17T00:00:00 | [
[
"Hamer",
"J. B. A.",
""
],
[
"Daou",
"R.",
""
],
[
"Özcan",
"S.",
""
],
[
"Mathur",
"N. D.",
""
],
[
"Fray",
"D. J.",
""
],
[
"Sandeman",
"K. G.",
""
]
] |
0708.0205 | Ferrier Meydi | L. Angers, F. Chiodi, J. C. Cuevas, G. Montambaux, M. Ferrier, S.
Gueron, H. Bouchiat | Proximity DC squids in the long junction limit | 12 pages, 16 figures | null | 10.1103/PhysRevB.77.165408 | null | cond-mat.mes-hall cond-mat.supr-con | null | We report the design and measurement of
Superconducting/normal/superconducting (SNS) proximity DC squids in the long
junction limit, i.e. superconducting loops interrupted by two normal metal
wires roughly a micrometer long. Thanks to the clean interface between the
metals, at low temperature a large supercurrent flows through the device. The
dc squid-like geometry leads to an almost complete periodic modulation of the
critical current through the device by a magnetic flux, with a flux periodicity
of a flux quantum h/2e through the SNS loop. In addition, we examine the entire
field dependence, notably the low and high field dependence of the maximum
switching current. In contrast with the well-known Fraunhoffer-type
oscillations typical of short wide junctions, we find a monotonous gaussian
extinction of the critical current at high field. As shown in [15], this
monotonous dependence is typical of long and narrow diffusive junctions. We
also find in some cases a puzzling reentrance at low field. In contrast, the
temperature dependence of the critical current is well described by the
proximity effect theory, as found by Dubos {\it et al.} [16] on SNS wires in
the long junction limit. The switching current distributions and hysteretic IV
curves also suggest interesting dynamics of long SNS junctions with an
important role played by the diffusion time across the junction.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:10:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Angers",
"L.",
""
],
[
"Chiodi",
"F.",
""
],
[
"Cuevas",
"J. C.",
""
],
[
"Montambaux",
"G.",
""
],
[
"Ferrier",
"M.",
""
],
[
"Gueron",
"S.",
""
],
[
"Bouchiat",
"H.",
""
]
] |
0708.0206 | Michael A. Mandell | Andrew J. Blumberg, Michael A. Mandell | Algebraic K-theory and abstract homotopy theory | Final version | Advances in Mathematics 226 (2011), no. 4, 3760-3812 | null | null | math.KT math.AT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We decompose the K-theory space of a Waldhausen category in terms of its
Dwyer-Kan simplicial localization. This leads to a criterion for functors to
induce equivalences of K-theory spectra that generalizes and explains many of
the criteria appearing in the literature. We show that under mild hypotheses, a
weakly exact functor that induces an equivalence of homotopy categories induces
an equivalence of K-theory spectra.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:11:03 GMT"
},
{
"version": "v2",
"created": "Fri, 31 Aug 2007 21:19:30 GMT"
},
{
"version": "v3",
"created": "Wed, 20 May 2009 20:38:40 GMT"
},
{
"version": "v4",
"created": "Tue, 2 Nov 2010 15:20:34 GMT"
}
] | 2011-08-09T00:00:00 | [
[
"Blumberg",
"Andrew J.",
""
],
[
"Mandell",
"Michael A.",
""
]
] |
0708.0207 | Andr\'e Walker-Loud | Paulo F. Bedaque and Andre Walker-Loud | Restless pions: orbifold boundary conditions and noise suppression in
lattice QCD | 15 pages, 4 figures | Phys.Lett.B660:369-375,2008 | 10.1016/j.physletb.2008.01.011 | UMD-40762-395 | hep-lat hep-ph hep-th nucl-th | null | The study of one or more baryons in lattice QCD is severely hindered by the
exponential decay in time of the signal-to-noise ratio. The rate at which the
signal-to-noise decreases is a function of the the pion mass. More precisely,
it depends on the minimum allowed pion energy in the box, which, for periodic
boundary conditions, is equal to its mass. We propose a set of boundary
conditions, given by a "parity orbifold'' construction, which eliminates the
zero momentum pion modes, raising the minimum pion energy without altering the
QCD ground state, and thereby improving the signal-to-noise ratio of
(multi)-baryon correlation functions at long Euclidean times. We discuss
variations of these "restless pions" boundary conditions and focus on their
impact on the study of nuclear forces.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:09:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bedaque",
"Paulo F.",
""
],
[
"Walker-Loud",
"Andre",
""
]
] |
0708.0208 | F. Javier Garcia de Abajo | F. J. Garcia de Abajo | Collective oscillations in optical matter | 4 figures. Optics Express (in press) | Optics Express 15, 11082-11094 (2007) | 10.1364/OE.15.011082 | null | cond-mat.soft cond-mat.other | null | Atom and nanoparticle arrays trapped in optical lattices are shown to be
capable of sustaining collective oscillations of frequency proportional to the
strength of the external light field. The spectrum of these oscillations
determines the mechanical stability of the arrays. This phenomenon is studied
for dimers, strings, and two-dimensional planar arrays. Laterally confined
particles free to move along an optical channel are also considered as an
example of collective motion in partially-confined systems. The fundamental
concepts of dynamical response in optical matter introduced here constitute the
basis for potential applications to quantum information technology and signal
processing. Experimental realizations of these systems are proposed.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:15:42 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"de Abajo",
"F. J. Garcia",
""
]
] |
0708.0209 | Yeung Chi Ho | C. H. Yeung, K. Y. Michael Wong, Y.-C. Zhang | Models of Financial Markets with Extensive Participation Incentives | 17 pages, 16 figures | Phys. Rev. E Vol. 77 026107 (2008) | 10.1103/PhysRevE.77.026107 | null | q-fin.TR physics.soc-ph | null | We consider models of financial markets in which all parties involved find
incentives to participate. Strategies are evaluated directly by their virtual
wealths. By tuning the price sensitivity and market impact, a phase diagram
with several attractor behaviors resembling those of real markets emerge,
reflecting the roles played by the arbitrageurs and trendsetters, and including
a phase with irregular price trends and positive sums. The positive-sumness of
the players' wealths provides participation incentives for them. Evolution and
the bid-ask spread provide mechanisms for the gain in wealth of both the
players and market-makers. New players survive in the market if the
evolutionary rate is sufficiently slow. We test the applicability of the model
on real Hang Seng Index data over 20 years. Comparisons with other models show
that our model has a superior average performance when applied to real
financial data.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:22:47 GMT"
},
{
"version": "v2",
"created": "Wed, 21 Nov 2007 07:54:01 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yeung",
"C. H.",
""
],
[
"Wong",
"K. Y. Michael",
""
],
[
"Zhang",
"Y. -C.",
""
]
] |
0708.0210 | Hiroshige Kajiura | Hiroshige Kajiura, Kyoji Saito, Atsushi Takahashi | Triangulated categories of matrix factorizations for regular systems of
weights with $\epsilon=-1$ | 57 pages, 5 figures | null | null | RIMS-1600 | math.AG math.RT | null | We construct a full strongly exceptional collection in the triangulated
category of graded matrix factorizations of a polynomial associated to a
non-degenerate regular system of weights whose smallest exponents are equal to
-1. In the associated Grothendieck group, the strongly exceptional collection
defines a root basis of a generalized root system of sign (l,0,2) and a Coxeter
element of finite order, whose primitive eigenvector is a regular element in
the expanded symmetric domain of type IV with respect to the Weyl group.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:23:25 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Kajiura",
"Hiroshige",
""
],
[
"Saito",
"Kyoji",
""
],
[
"Takahashi",
"Atsushi",
""
]
] |
0708.0211 | Jacob Hartman | Jacob M. Hartman (1), Alessandro Patruno (2), Deepto Chakrabarty (1),
David L. Kaplan (1), Craig B. Markwardt (3), Edward H. Morgan (1), Paul S.
Ray (4), Michiel van der Klis (2), and Rudy Wijnands (2) ((1) MIT, (2) Univ.
Amsterdam, (3) Univ. Maryland and GSFC, (4) Naval Research Lab) | The long-term evolution of the spin, pulse shape, and orbit of the
accretion-powered millisecond pulsar SAX J1808.4-3658 | 22 pages, 10 figures; accepted for publication in ApJ | Astrophys.J.675:1468-1486,2008 | 10.1086/527461 | null | astro-ph | null | We present a 7 yr timing study of the 2.5 ms X-ray pulsar SAX J1808.4-3658,
an X-ray transient with a recurrence time of ~2 yr, using data from the Rossi
X-ray Timing Explorer covering 4 transient outbursts (1998-2005). We verify
that the 401 Hz pulsation traces the spin frequency fundamental and not a
harmonic. Substantial pulse shape variability, both stochastic and systematic,
was observed during each outburst. Analysis of the systematic pulse shape
changes suggests that, as an outburst dims, the X-ray "hot spot" on the pulsar
surface drifts longitudinally and a second hot spot may appear. The overall
pulse shape variability limits the ability to measure spin frequency evolution
within a given X-ray outburst (and calls previous nudot measurements of this
source into question), with typical upper limits of |nudot| < 2.5x10^{-14} Hz/s
(2 sigma). However, combining data from all the outbursts shows with high (6
sigma) significance that the pulsar is undergoing long-term spin down at a rate
nudot = (-5.6+/-2.0)x10^{-16} Hz/s, with most of the spin evolution occurring
during X-ray quiescence. We discuss the possible contributions of magnetic
propeller torques, magnetic dipole radiation, and gravitational radiation to
the measured spin down, setting an upper limit of B < 1.5x10^8 G for the
pulsar's surface dipole magnetic field and and Q/I < 5x10^{-9} for the
fractional mass quadrupole moment. We also measured an orbital period
derivative of Pdot = (3.5+/-0.2)x10^{-12} s/s. This surprising large Pdot is
reminiscent of the large and quasi-cyclic orbital period variation observed in
the so-called "black widow" millisecond radio pulsars, supporting speculation
that SAX J1808.4-3658 may turn on as a radio pulsar during quiescence. In an
appendix we derive an improved (0.15 arcsec) source position from optical data.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:47:19 GMT"
},
{
"version": "v2",
"created": "Sun, 16 Dec 2007 17:11:19 GMT"
}
] | 2010-11-11T00:00:00 | [
[
"Hartman",
"Jacob M.",
""
],
[
"Patruno",
"Alessandro",
""
],
[
"Chakrabarty",
"Deepto",
""
],
[
"Kaplan",
"David L.",
""
],
[
"Markwardt",
"Craig B.",
""
],
[
"Morgan",
"Edward H.",
""
],
[
"Ray",
"Paul S.",
""
],
[
"van der Klis",
"Michiel",
""
],
[
"Wijnands",
"Rudy",
""
]
] |
0708.0212 | Konstantin Matveev | K. A. Matveev, A. Furusaki, L. I. Glazman | Bosonization of strongly interacting electrons | 21 pages, 4 figures | Phys. Rev. B 76, 155440 (2007) | 10.1103/PhysRevB.76.155440 | null | cond-mat.mes-hall cond-mat.str-el | null | Strong repulsive interactions in a one-dimensional electron system suppress
the exchange coupling J of electron spins to a value much smaller than the
Fermi energy E_F. The conventional theoretical description of such systems
based on the bosonization approach and the concept of Tomonaga-Luttinger liquid
is applicable only at energies below J. In this paper we develop a theoretical
approach valid at all energies below the Fermi energy, including a broad range
of energies between J and E_F. The method involves bosonization of the charge
degrees of freedom, while the spin excitations are treated exactly. We use this
technique to calculate the spectral functions of strongly interacting electron
systems at energies in the range J<<epsilon<< E_F$. We show that in addition to
the expected features at the wavevector k near the Fermi point k_F, the
spectral function has a strong peak centered at k=0. Our theory also provides
analytical description of the spectral function singularities near 3k_F (the
"shadow band" features).
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:28:55 GMT"
}
] | 2007-11-01T00:00:00 | [
[
"Matveev",
"K. A.",
""
],
[
"Furusaki",
"A.",
""
],
[
"Glazman",
"L. I.",
""
]
] |
0708.0213 | Ilan Hirshberg | Ilan Hirshberg and Wilhelm Winter | Permutations of Strongly Self-Absorbing C*-algebras | 8 pages | null | null | null | math.OA | null | Let G be a finite group acting on {1,...,n}. For any C*-algebra A, this
defines an action of \alpha of G on A^{\otimes n}. We show that if A
tensorially absorbs a UHF algebra of infinite type, the Jiang-Su algebra, or is
approximately divisible, then A \times_{\alpha} G has the corresponding
property as well.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:29:35 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Hirshberg",
"Ilan",
""
],
[
"Winter",
"Wilhelm",
""
]
] |
0708.0214 | Douglas Braun | D. C. Braun, A. C. Birch, D. Benson, R. F. Stein, \AA. Nordlund | Helioseismic Holography of Simulated Solar Convection and Prospects for
the Detection of Small-Scale Subsurface Flows | 32 pages, 10 figures | null | 10.1086/521782 | null | astro-ph | null | We perform helioseismic holography on realistic solar convection simulations
and compare the observed travel-time perturbations with the expected travel
times from the horizontal flows in the simulations computed from forward models
under the assumption of the Born approximation. We demonstrate reasonable
agreement between the observed and model travel times which reinforces the
validity of helioseismic holography in the detection of subsurface horizontal
flows. From the variation of the signal-to-noise ratio with depth, we conclude
that the helioseismic detection of individual flow structures with spatial
scales of supergranulation or smaller is not possible for depths below about 5
Mm below the surface over time scales less than a day. Approximately half of
the observed signal originates within the first 2 Mm below the surface. A
consequence of this is a rapid decrease (and reversal in some cases) of the
travel-time perturbations with depth due to the contribution to the
measurements of oppositely directed surface flows in neighboring convective
cells. This confirms an earlier interpretation of similar effects reported from
observations.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:29:38 GMT"
}
] | 2016-03-28T00:00:00 | [
[
"Braun",
"D. C.",
""
],
[
"Birch",
"A. C.",
""
],
[
"Benson",
"D.",
""
],
[
"Stein",
"R. F.",
""
],
[
"Nordlund",
"Å.",
""
]
] |
0708.0215 | Marco Spaans | M. Spaans | Comments on the Invariance of Physical Laws Under Particle
Re-Arrangement | 2 pages, reactions appreciated; final edits | null | null | null | gr-qc | null | Observationally and experimentally, physical laws express how particles
interact. Conversely, physical laws should be invariant under any
re-arrangement of those particles, e.g., the laws of gravity do not change if
one re-arranges the stars in the sky. To explore the physical meaning of these
assertions, arguments are presented that show how the freedom of particle
re-arrangement leads to an identical twin associated with any photon, i.e.,
nature sees double. These twins can become spatially separated for
astronomically distant objects and are special in that detection of the one
causes the disappearance of the other. A tilting detector then leads to
brightness variations across an image for twin separations on the order of the
detector size.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:34:00 GMT"
},
{
"version": "v2",
"created": "Sat, 4 Aug 2007 14:46:33 GMT"
},
{
"version": "v3",
"created": "Fri, 10 Aug 2007 07:31:54 GMT"
},
{
"version": "v4",
"created": "Mon, 20 Aug 2007 07:01:38 GMT"
}
] | 2007-08-20T00:00:00 | [
[
"Spaans",
"M.",
""
]
] |
0708.0216 | Jon-Hsu Ho | J. H. Ho, Y. H. Lai, Y. H. Chiu, and M. F. Lin | Modulation effects on Landau levels in a monolayer graphene | 11 pages,4 figures | null | null | null | cond-mat.mes-hall | null | A monolayer graphene exists in an environment where a uniform magnetic field
interacts a spatially modulated magnetic field. The spatially modulated
magnetic field could affect Landau levels due to a uniform magnetic field. The
modulation effects on Landau levels are investigated through the Peierl's
tight-binding model. The magneto-electronic properties are dominated by the
period, the strength, and the direction of a spatially modulated magnetic
field. Such a field could induce the growth in dimensionality, the change of
energy dispersions, the destroy of state degeneracy, and the creation of
band-edge states. There are a robust Landau level at Fermi level and 1D
parabolic subbands located around the original Landau levels, which make
density of states exhibit a delta-function-like structure and many pairs of
asymmetric peak structure, respectively. The density of states and the energies
of band-edge states strongly depend on the strength, but not on the period and
the direction.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:42:25 GMT"
}
] | 2007-08-02T00:00:00 | [
[
"Ho",
"J. H.",
""
],
[
"Lai",
"Y. H.",
""
],
[
"Chiu",
"Y. H.",
""
],
[
"Lin",
"M. F.",
""
]
] |
0708.0217 | Tayseer Abu Alrub T. Abu Alrub | T. R. Abu Alrub, S. H. Curnoe | Impurity induced density of states and residual transport in nonunitary
superconductors | 8 pages, 1 figure | http://link.aps.org/abstract/PRB/v76/e184511, Phys. Rev. B 76,
184511 (2007) | 10.1103/PhysRevB.76.184511 | null | cond-mat.supr-con cond-mat.str-el | null | We obtain general expressions for the residual density of states, electrical
conductivity and thermal conductivity for non-unitary superconductors due to
impurity scattering. We apply the results to the so-called `B phase' of
PrOs4Sb12, which we describe using a non-unitary gap function derived from
symmetry considerations. The conductivity tensor has inequivalent diagonal
components due to off-axis nodal positions which may be detectable in
experiments.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 18:41:33 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 22:50:14 GMT"
},
{
"version": "v3",
"created": "Mon, 12 Nov 2007 21:23:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Alrub",
"T. R. Abu",
""
],
[
"Curnoe",
"S. H.",
""
]
] |
0708.0218 | Paul Koehler | P. E. Koehler, J. L. Ullmann, T. A. Bredeweg, J. M. O`Donnell, R.
Reifarth, R. S. Rundberg, D. J. Vieira, and J. M. Wouters | Spin measurements for 147Sm+n resonances: Further evidence for
non-statistical effects | 40 pages, 13 figures, accepted by Phys. Rev. C | Phys.Rev.C76:025804,2007 | 10.1103/PhysRevC.76.025804 | null | nucl-ex nucl-th | null | We have determined the spins J of resonances in the 147Sm(n,gamma) reaction
by measuring multiplicities of gamma-ray cascades following neutron capture.
Using this technique, we were able to determine J values for all but 14 of the
140 known resonances below En = 1 keV, including 41 firm J assignments for
resonances whose spins previously were either unknown or tentative. These new
spin assignments, together with previously determined resonance parameters,
allowed us to extract separate level spacings and neutron strength functions
for J = 3 and 4 resonances. Furthermore, several statistical test of the data
indicate that very few resonances of either spin have been missed below En =
700eV. Because a non-statistical effect recently was reported near En = 350 eV
from an analysis of 147Sm(n,alpha) data, we divided the data into two regions;
0 < En < 350 eV and 350 < En < 700 eV. Using neutron widths from a previous
measurement and published techniques for correcting for missed resonances and
for testing whether data are consistent with a Porter-Thomas distribution, we
found that the reduced-neutron-width distribution for resonances below 350 eV
is consistent with the expected Porter-Thomas distribution. On the other hand,
we found that reduced-neutron-width data in the 350 < En < 700 eV region are
inconsistent with a Porter-Thomas distribution, but in good agreement with a
chi-squared distribution having two or more degrees of freedom. We discuss
possible explanations for these observed non-statistical effects and their
possible relation to similar effects previously observed in other nuclides.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 19:55:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Koehler",
"P. E.",
""
],
[
"Ullmann",
"J. L.",
""
],
[
"Bredeweg",
"T. A.",
""
],
[
"O`Donnell",
"J. M.",
""
],
[
"Reifarth",
"R.",
""
],
[
"Rundberg",
"R. S.",
""
],
[
"Vieira",
"D. J.",
""
],
[
"Wouters",
"J. M.",
""
]
] |
0708.0219 | Hakan Andreasson | Hakan Andreasson | Sharp bounds on the critical stability radius for relativistic charged
spheres: I | This paper has been withdrawn since its content is included in the
more general version arXiv:0804.1882 | null | null | null | gr-qc | null | This paper has been withdrawn since its content is included in the more
general version arXiv:0804.1882
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 19:54:34 GMT"
},
{
"version": "v2",
"created": "Wed, 1 Aug 2007 20:13:41 GMT"
},
{
"version": "v3",
"created": "Fri, 11 Apr 2008 12:15:07 GMT"
}
] | 2008-04-11T00:00:00 | [
[
"Andreasson",
"Hakan",
""
]
] |
0708.0220 | Christopher J. Deloye | Christopher J. Deloye (Northwestern University), Ronald E. Taam
(Northwestern University), Christopher Winisdoerffer (CRAL Lyon), Gilles
Chabrier (CRAL Lyon) | The Thermal Evolution of the Donors in AM CVn Binaries | (20 pages, 20 figures, accepted to the Monthly Notices of the Royal
Astronomical Society) | null | 10.1111/j.1365-2966.2007.12262.x | null | astro-ph | null | (Abridged) We calculate the full stellar-structural evolution of donors in AM
CVn systems formed through the WD channel coupled to the binary's evolution.
Contrary to assumptions made in prior modelling, these donors are not fully
convective over much of the AM CVn phase and do not evolve adiabatically under
mass loss indefinitely. Instead, we identify three distinct phases of
evolution: a mass transfer turn-on phase (during which the orbital period
continues to decrease even after contact, the donor contracts, and the mass
transfer rate accelerates to its maximum), a phase in which the donor expands
adiabatically in response to mass loss, and a cooling phase beginning at
orbital periods of approximately 45--55 minutes during which the donor
contracts. The physics that determines the behaviour in the first and third
phases, both of which are new outcomes of this study, are discussed in some
detail. We find the overall duration of the turn-on phase to be between $\sim
10^4$-$10^6$ yrs, significantly longer than prior estimates. We predict the
donor's luminosity and effective temperature. During the adiabatic expansion
phase (ignoring irradiation effects), the luminosity is approximately
$10^{-6}$--$10^{-4} L_\odot$ and the effective temperature is approximately
1000--1800 K. However, the flux generated in the accretion flow dominates the
donor's intrinsic light at all times. The impact of irradiation on the donor
extends the phase of adiabatic expansion to longer orbital periods and alters
the donor's observational characteristics. Irradiated donors during the
adiabatic phase can attain a surface luminosity of up to $\approx10^{-2}
L_\odot$. We argue that the turn-on and cooling phases both will leave
significant imprints on the AM CVn population's orbital period distribution.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:34:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Deloye",
"Christopher J.",
"",
"Northwestern University"
],
[
"Taam",
"Ronald E.",
"",
"Northwestern University"
],
[
"Winisdoerffer",
"Christopher",
"",
"CRAL Lyon"
],
[
"Chabrier",
"Gilles",
"",
"CRAL Lyon"
]
] |
0708.0221 | Craig Booth | C. M. Booth (ICC-Durham) and Tom Theuns (ICC-Durham; Univ. of Antwerp) | Neutral hydrogen in galactic fountains | 5 pages, 5 figures. Accepted for publication in MNRAS letters | 2007, MNRAS 381, L89 | 10.1111/j.1745-3933.2007.00374.x | null | astro-ph | null | Simulations of an isolated Milky Way-like galaxy, in which supernovae power a
galactic fountain, reproduce the observed velocity and 21cm brightness
statistics of galactic neutral hydrogen (HI). The simulated galaxy consists of
a thin HI disk, similar in extent and brightness to that observed in the Milky
Way, and extra-planar neutral gas at a range of velocities due to the galactic
fountain. Mock observations of the neutral gas resemble the HI flux
measurements from the Leiden-Argentine-Bonn (LAB) HI, survey, including a
high-velocity tail which matches well with observations of high-velocity
clouds. The simulated high-velocity clouds are typically found close to the
galactic disk, with a typical line-of-sight distance of 13kpc from observers on
the solar circle. The fountain efficiently cycles matter from the centre of the
galaxy to its outskirts at a rate of around 0.5 M_sun/yr
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 12:36:46 GMT"
}
] | 2012-03-19T00:00:00 | [
[
"Booth",
"C. M.",
"",
"ICC-Durham"
],
[
"Theuns",
"Tom",
"",
"ICC-Durham; Univ. of Antwerp"
]
] |
0708.0222 | Myriam P. Sarachik | S. McHugh, R. Jaafar, M. P. Sarachik, Y. Myasoedov, A. Finkler, H.
Shtrikman, E. Zeldov, R. Bagai, G. Christou | Ignition and Propagation of Magnetic Avalanches in Mn$_{12}$-Acetate:
the effect of quantum tunneling | 4 pages, 5 figures; modified claims | null | null | null | cond-mat.mes-hall cond-mat.mtrl-sci | null | Using a wire heater to ignite magnetic avalanches in fixed magnetic field
applied along the easy axis of single crystals of the molecular magnet
Mn$_{12}$-acetate, we report fast local measurements of the temperature and
time-resolved measurements of the local magnetization as a function of magnetic
field. In addition to confirming maxima in the velocity of propagation, we find
that avalanches trigger at a threshold temperature which exhibits pronounced
minima at resonant magnetic fields, demonstrating that thermally assisted
quantum tunneling plays an important role in the ignition as well as the
propagation of magnetic avalanches in molecular magnets.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 20:03:43 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Sep 2007 15:51:12 GMT"
}
] | 2007-09-10T00:00:00 | [
[
"McHugh",
"S.",
""
],
[
"Jaafar",
"R.",
""
],
[
"Sarachik",
"M. P.",
""
],
[
"Myasoedov",
"Y.",
""
],
[
"Finkler",
"A.",
""
],
[
"Shtrikman",
"H.",
""
],
[
"Zeldov",
"E.",
""
],
[
"Bagai",
"R.",
""
],
[
"Christou",
"G.",
""
]
] |
0708.0223 | Jussi Valiviita | Hooshyar Assadullahi (ICG, Portsmouth), Jussi Valiviita (ICG,
Portsmouth) and David Wands (ICG, Portsmouth) | Primordial non-Gaussianity from two curvaton decays | 20 pages, 5 figures | Phys.Rev.D76:103003,2007 | 10.1103/PhysRevD.76.103003 | null | hep-ph astro-ph | null | We study a model where two scalar fields, that are subdominant during
inflation, decay into radiation some time after inflation has ended but before
primordial nucleosynthesis. Perturbations of these two curvaton fields can be
responsible for the primordial curvature perturbation. We write down the full
non-linear equations that relate the primordial perturbation to the curvaton
perturbations on large scales, calculate the power spectrum of the primordial
perturbation, and finally go to second order to find the non-linearity
parameter, fNL. We find large positive values of fNL if the energy densities of
the curvatons are sub-dominant when they decay, as in the single curvaton case.
But we also find a large fNL even if the curvatons dominate the total energy
density in the case when the inhomogeneous radiation produced by the first
curvaton decay is diluted by the decay of a second nearly homogeneous curvaton.
The minimum value min(fNL)=-5/4 which we find is the same as in the
single-curvaton case.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 20:04:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Assadullahi",
"Hooshyar",
"",
"ICG, Portsmouth"
],
[
"Valiviita",
"Jussi",
"",
"ICG,\n Portsmouth"
],
[
"Wands",
"David",
"",
"ICG, Portsmouth"
]
] |
0708.0224 | Savas Dayanik | Savas Dayanik, H. Vincent Poor, Semih O. Sezer | Multisource Bayesian sequential change detection | Published in at http://dx.doi.org/10.1214/07-AAP463 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. 2, 552-590 | 10.1214/07-AAP463 | IMS-AAP-AAP463 | math.ST cs.IT math.IT math.PR stat.TH | null | Suppose that local characteristics of several independent compound Poisson
and Wiener processes change suddenly and simultaneously at some unobservable
disorder time. The problem is to detect the disorder time as quickly as
possible after it happens and minimize the rate of false alarms at the same
time. These problems arise, for example, from managing product quality in
manufacturing systems and preventing the spread of infectious diseases. The
promptness and accuracy of detection rules improve greatly if multiple
independent information sources are available. Earlier work on sequential
change detection in continuous time does not provide optimal rules for
situations in which several marked count data and continuously changing signals
are simultaneously observable. In this paper, optimal Bayesian sequential
detection rules are developed for such problems when the marked count data is
in the form of independent compound Poisson processes, and the continuously
changing signals form a multi-dimensional Wiener process. An auxiliary optimal
stopping problem for a jump-diffusion process is solved by transforming it
first into a sequence of optimal stopping problems for a pure diffusion by
means of a jump operator. This method is new and can be very useful in other
applications as well, because it allows the use of the powerful optimal
stopping theory for diffusions.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 20:25:14 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Aug 2007 19:46:36 GMT"
},
{
"version": "v3",
"created": "Tue, 1 Apr 2008 12:58:00 GMT"
}
] | 2008-04-01T00:00:00 | [
[
"Dayanik",
"Savas",
""
],
[
"Poor",
"H. Vincent",
""
],
[
"Sezer",
"Semih O.",
""
]
] |
0708.0225 | Edith Adan-Bante | Edith Adan-Bante and Helena Verrill | Symmetric groups and conjugacy classes | 7 pages | null | null | null | math.GR | null | Let S_n be the symmetric group on n-letters. Fix n>5. Given any nontrivial
$\alpha,\beta\in S_n$, we prove that the product $\alpha^{S_n}\beta^{S_n}$ of
the conjugacy classes $\alpha^{S_n}$ and $\beta^{S_n}$ is never a conjugacy
class. Furthermore, if n is not even and $n$ is not a multiple of three, then
$\alpha^{S_n}\beta^{S_n}$ is the union of at least three distinct conjugacy
classes. We also describe the elements $\alpha,\beta\in S_n$ in the case when
$\alpha^{S_n}\beta^{S_n}$ is the union of exactly two distinct conjugacy
classes.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 20:29:05 GMT"
}
] | 2007-08-03T00:00:00 | [
[
"Adan-Bante",
"Edith",
""
],
[
"Verrill",
"Helena",
""
]
] |
0708.0226 | Mansi Kasliwal | M. M. Kasliwal, S. B. Cenko, S. R. Kulkarni, P. B. Cameron, E. Nakar,
E. O. Ofek, A. Rau, A. M. Soderberg, S. Campana, J. S. Bloom, D. A. Perley,
L. Pollack, S. Barthelmy, J. Cummings, N. Gehrels, H. A. Krimm, C. B.
Markwardt, G. Sato, P. Chandra, D. Frail, D. B. Fox, P. Price, E. Berger, S.
A. Grebenev, R. A. Krivonos, R. A. Sunyaev | GRB070610 : A Curious Galactic Transient | Substantially revised since additional late-time observations
indicate the optical/IR counterpart to GRB070610 is very faint. Precise
astrometry indicates that the original spectrum was of a very nearby brighter
star but not the counterpart to GRB070610. Full resolution figures at
http://www.astro.caltech.edu/~mansi/g070610.ps | null | 10.1086/526407 | null | astro-ph | null | GRB 070610 is a typical high-energy event with a duration of 5s.Yet within
the burst localization we detect a highly unusual X-ray and optical transient,
SwiftJ195509.6+261406. We see high amplitude X-ray and optical variability on
very short time scales even at late times. Using near-infrared imaging assisted
by a laser guide star and adaptive optics, we identified the counterpart of
SwiftJ195509.6+261406. Late-time optical and near-infrared imaging constrain
the spectral type of the counterpart to be fainter than a K-dwarf assuming it
is of Galactic origin. It is possible that GRB 070610 and Swift
J195509.6+261406 are unrelated sources. However, the absence of a typical X-ray
afterglow from GRB 070610 in conjunction with the spatial and temporal
coincidence of the two motivate us to suggest that the sources are related. The
closest (imperfect) analog to Swift J195509.6+261406 is V4641 Sgr, an unusual
black hole binary. We suggest that Swift J195509.6+261406 along with V4641 Sgr
define a sub-class of stellar black hole binaries -- the fast X-ray novae. We
further suggest that fast X-ray novae are associated with bursts of gamma-rays.
If so, GRB 070610 defines a new class of celestial gamma-ray bursts and these
bursts dominate the long-duration GRB demographics
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 19:55:05 GMT"
},
{
"version": "v2",
"created": "Mon, 22 Oct 2007 00:13:51 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kasliwal",
"M. M.",
""
],
[
"Cenko",
"S. B.",
""
],
[
"Kulkarni",
"S. R.",
""
],
[
"Cameron",
"P. B.",
""
],
[
"Nakar",
"E.",
""
],
[
"Ofek",
"E. O.",
""
],
[
"Rau",
"A.",
""
],
[
"Soderberg",
"A. M.",
""
],
[
"Campana",
"S.",
""
],
[
"Bloom",
"J. S.",
""
],
[
"Perley",
"D. A.",
""
],
[
"Pollack",
"L.",
""
],
[
"Barthelmy",
"S.",
""
],
[
"Cummings",
"J.",
""
],
[
"Gehrels",
"N.",
""
],
[
"Krimm",
"H. A.",
""
],
[
"Markwardt",
"C. B.",
""
],
[
"Sato",
"G.",
""
],
[
"Chandra",
"P.",
""
],
[
"Frail",
"D.",
""
],
[
"Fox",
"D. B.",
""
],
[
"Price",
"P.",
""
],
[
"Berger",
"E.",
""
],
[
"Grebenev",
"S. A.",
""
],
[
"Krivonos",
"R. A.",
""
],
[
"Sunyaev",
"R. A.",
""
]
] |
0708.0227 | German Ros | G. Ros (1,2), G. A. Medina-Tanco (3), C. De Donato (4), L. del Peral
(1), D. Rodr\'iguez-Fr\'ias (1), J.C. D'Olivo (3), J.F. Vald\'es-Galicia (5),
F. Arqueros (2). ((1)Space Plasmas and Astroparticle Group, Universidad de
Alcal\'a, Pza. San Diego, s/n. Alcal\'a de Henares (Madrid), Spain. (2) Dpto.
F\'isica At\'omica, Molecular y Nuclear, Facultad de F\'isica, Universidad
Complutense de Madrid, Ciudad Universitaria, Madrid (Spain). (3) Dpto. Altas
Energ\'ias, Inst. de Ciencias Nucleares, Universidad Nacional Aut\'onoma de
M\'exico, M\'exico D.F. (M\'exico). (4) Dipartimento di Fisica
dell'Universit\'a degli Studi di Milano and Sezione INFN, via Celoria 16. (5)
Inst. de Geof\'isica. Universidad Nacional Aut\'onoma de M\'exico, M\'exico
D.F.) | Lateral distribution and the energy determination of showers along the
ankle | 4 pages, 4 figures, Proceedings of the 30th International Cosmic Ray
Conference, Merida (2007), M\'exico | null | null | null | astro-ph | null | The normalization constant of the lateral distribution function (LDF) of an
extensive air shower is a monotonous (almost linear) increasing function of the
energy of the primary. Therefore, the interpolated signal at some fixed
distance from the core can be calibrated to estimate the energy of the shower.
There is, somehow surprisingly, a reconstructed optimal distance, r_{opt}, at
which the effects on the inferred signal, S(r_{opt}), of the uncertainties on
true core location, LDF functional form and shower-to-shower fluctuations are
minimized. We calculate the value of r_{opt} as a function of surface detector
separation, energy and zenith angle and we demonstrate the advantage of using
the r_{opt} value of each individual shower instead of a same fixed distance
for every shower, specially in dealing with events with saturated stations. The
effects on the determined spectrum are also shown.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 20:32:07 GMT"
}
] | 2007-08-03T00:00:00 | [
[
"Ros",
"G.",
""
],
[
"Medina-Tanco",
"G. A.",
""
],
[
"De Donato",
"C.",
""
],
[
"del Peral",
"L.",
""
],
[
"Rodríguez-Frías",
"D.",
""
],
[
"D'Olivo",
"J. C.",
""
],
[
"Valdés-Galicia",
"J. F.",
""
],
[
"Arqueros",
"F.",
""
],
[
".",
"",
""
]
] |
0708.0228 | Matthew Schurch | M.P.E. Schurch (1), M.J. Coe (1), K.E. McGowan (1), V.A. McBride (1),
D.A. Buckley (2), J.L. Galache (3), and R.H.D. Corbet (4) ((1) University of
Southampton, (2) SAAO, (3) CfA, (4) USRA/GSFC) | Optical Follow-up of New SMC Wing Be/X-ray Binaries | 9 pages, 9 figures, 2 tables, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12315.x | null | astro-ph | null | We investigate the optical counterparts of recently discovered Be/X-ray
binaries in the Small Magellanic Cloud. In total four sources, SXP101, SXP700,
SXP348 and SXP65.8 were detected during the Chandra Survey of the Wing of the
SMC. SXP700 and SXP65.8 were previously unknown. Many optical ground based
telescopes have been utilised in the optical follow-up, providing coverage in
both the red and blue bands. This has led to the classification of all of the
counterparts as Be stars and confirms that three lie within the Galactic
spectral distribution of known Be/X-ray binaries. SXP101 lies outside this
distribution becoming the latest spectral type known. Monitoring of the Halpha
emission line suggests that all the sources bar SXP700 have highly variable
circumstellar disks, possibly a result of their comparatively short orbital
periods. Phase resolved X-ray spectroscopy has also been performed on SXP65.8,
revealing that the emission is indeed harder during the passage of the X-ray
beam through the line of sight.
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 13:24:57 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schurch",
"M. P. E.",
""
],
[
"Coe",
"M. J.",
""
],
[
"McGowan",
"K. E.",
""
],
[
"McBride",
"V. A.",
""
],
[
"Buckley",
"D. A.",
""
],
[
"Galache",
"J. L.",
""
],
[
"Corbet",
"R. H. D.",
""
]
] |
0708.0229 | Matthias Hoeft | Matthias Hoeft, Gustavo Yepes and Stefan Gottloeber | Too small to form a galaxy: How the UV background determines the baryon
fraction | To appear in Proceedings of IAU Symp #244, "Dark Galaxies and Lost
Baryons", June 2007, 5 pages including 3 figures | null | 10.1017/S1743921307014093 | null | astro-ph | null | The cosmic ultraviolet background (UVB) heats the intergalactic medium (IGM),
as a result the gas in dark matter halos below a certain mass is too hot to
cool within a Hubble time. The UVB effectively suppresses the formation of
dwarf galaxies. Using high resolution cosmological hydrodynamical simulations
we show that photo heating leads to small baryon fractions in halos below ~
6x10^9 h^{-1}M_sun, independent of the cosmic environment. The simulations are
carried out assuming a homogeneous UVB with flux densities as given by Haardt &
Madau (1996). A halo may stop to condense gas significantly after the universe
is reionised, namely when its mass falls below the characteristic mass scale
set by the photo heating. Assuming a spherical halo model we derive this
characteristic mass analytically and identify the main mechanisms that prevent
the gas from cooling in small halos. The theoretically derived characteristic
mass is smaller than the one obtained from observations. Increasing the energy
per ionising photon by a factor between four and eight would be sufficient to
reconcile both. This is equivalent to an average temperature of the IGM of ~
10^4 K. In this sense the faint end of the luminosity function may serve as a
calorimeter for the IGM.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 20:52:24 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hoeft",
"Matthias",
""
],
[
"Yepes",
"Gustavo",
""
],
[
"Gottloeber",
"Stefan",
""
]
] |
0708.0230 | Sergey Frolov | Sergey M. Frolov, Micah J.A. Stoutimore, Trevis A. Crane, Dale J. Van
Harlingen, Vladimir A. Oboznov, Valery V. Ryazanov, Adele Ruosi, Carmine
Granata, Maurizio Russo | Imaging spontaneous currents in superconducting arrays of pi-junctions | Pre-referee version. Accepted to Nature Physics | null | 10.1038/nphys780 | null | cond-mat.supr-con cond-mat.mes-hall | null | Superconductors separated by a thin tunneling barrier exhibit the Josephson
effect that allows charge transport at zero voltage, typically with no phase
shift between the superconductors in the lowest energy state. Recently,
Josephson junctions with ground state phase shifts of pi proposed by theory
three decades ago have been demonstrated. In superconducting loops,
pi-junctions cause spontaneous circulation of persistent currents in zero
magnetic field, analogous to spin-1/2 systems. Here we image the spontaneous
zero-field currents in superconducting networks of temperature-controlled
pi-junctions with weakly ferromagnetic barriers using a scanning SQUID
microscope. We find an onset of spontaneous supercurrents at the 0-pi
transition temperature of the junctions Tpi = 3 K. We image the currents in
non-uniformly frustrated arrays consisting of cells with even and odd numbers
of pi-junctions. Such arrays are attractive model systems for studying the
exotic phases of the 2D XY-model and achieving scalable adiabatic quantum
computers.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 20:58:01 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Frolov",
"Sergey M.",
""
],
[
"Stoutimore",
"Micah J. A.",
""
],
[
"Crane",
"Trevis A.",
""
],
[
"Van Harlingen",
"Dale J.",
""
],
[
"Oboznov",
"Vladimir A.",
""
],
[
"Ryazanov",
"Valery V.",
""
],
[
"Ruosi",
"Adele",
""
],
[
"Granata",
"Carmine",
""
],
[
"Russo",
"Maurizio",
""
]
] |
0708.0231 | Cyrille Marquet | Cyrille Marquet | Forward inclusive dijet production and azimuthal correlations in pA
collisions | 14 pages, 4 figures, references added, version to appear in NPA | Nucl.Phys.A796:41-60,2007 | 10.1016/j.nuclphysa.2007.09.001 | null | hep-ph nucl-th | null | We derive forward inclusive dijet production in the scattering of a dilute
hadron off an arbitrary dense target, whose partons with small fraction of
momentum x are described by a Color Glass Condensate. Both multiple scattering
and non-linear QCD evolution at small-x are included. This is of relevance for
measurements of two-particle correlations in the proton direction of
proton-nucleus collisions at RHIC and LHC energies. The azimuthal angle
distribution is peaked back to back and broadens as the momenta of the measured
particles gets closer to the saturation scale.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:02:58 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 15:55:36 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Marquet",
"Cyrille",
""
]
] |
0708.0232 | Marco Radici | Marco Radici, Francesco Conti, Alessandro Bacchetta, Andrea Bianconi | Nucleon Spin Structure with hadronic collisions at COMPASS | talk delivered to the "International Workshop on Structure and
Spectroscopy", Freiburg, March 19-21, 2007; 18 pages, RevTeX4 style, 8
figures with 10 .eps files | null | null | null | hep-ph | null | In order to illustrate the capabilities of COMPASS using a hadronic beam, I
review some of the azimuthal asymmetries in hadronic collisions, that allow for
the extraction of transversity, Sivers and Boer-Mulders functions, necessary to
explore the partonic spin structure of the nucleon. I also report on some Monte
Carlo simulations of such asymmetries for the production of Drell-Yan lepton
pairs from the collision of high-energy pions on a transversely polarized
proton target.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:03:10 GMT"
}
] | 2007-08-03T00:00:00 | [
[
"Radici",
"Marco",
""
],
[
"Conti",
"Francesco",
""
],
[
"Bacchetta",
"Alessandro",
""
],
[
"Bianconi",
"Andrea",
""
]
] |
0708.0233 | Brad Wargelin | B. J. Wargelin, P. Beiersdorfer, and G. V. Brown | EBIT Charge-Exchange Measurements and Astrophysical Applications | 28 pages, 26 figures (some a bit degraded from compression), accepted
by Can. J. Phys. for special issue on "20 Years of EBIT Spectroscopy" | null | 10.1139/P07-125 | null | astro-ph | null | The past decade has seen a surge of interest in astrophysical charge exchange
(CX). The impetus was the discovery of X-ray emission from comets in 1996, soon
followed by the observation of CX emission in planetary atmospheres and
throughout the heliosphere. Geocoronal and heliospheric CX are now recognized
to contribute a considerable fraction of the soft X-ray background, and
stellar-wind charge exchange is expected to occur in the astrospheres
surrounding many stars. CX may also contribute to X-ray line emission in
supernova remnants, the Galactic Center, and the Galactic Ridge. This article
summarizes the key aspects of CX X-ray emission and its astrophysical
relevance, and reviews related laboratory measurements and theoretical
predictions with particular attention to spectroscopy experiments conducted on
electron beam ion traps.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:04:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Wargelin",
"B. J.",
""
],
[
"Beiersdorfer",
"P.",
""
],
[
"Brown",
"G. V.",
""
]
] |
0708.0234 | Ivan Avramidi | Ivan G. Avramidi | Heat Kernel Asymptotics on Homogeneous Bundles | 29 pages, Proceedings of the 2007 Midwest Geometry Conference in
Honor of Thomas P. Branson | Int.J.Geom.Meth.Mod.Phys.5:1-23,2008 | 10.1142/S0219887808002862 | null | math.DG hep-th math-ph math.AP math.MP | null | We consider Laplacians acting on sections of homogeneous vector bundles over
symmetric spaces. By using an integral representation of the heat semi-group we
find a formal solution for the heat kernel diagonal that gives a generating
function for the whole sequence of heat invariants. We argue that the obtained
formal solution correctly reproduces the exact heat kernel diagonal after a
suitable regularization and analytical continuation.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:15:20 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Avramidi",
"Ivan G.",
""
]
] |
0708.0235 | J. A. R. Cembranos | Jose A. R. Cembranos, Alvaro de la Cruz-Dombriz, Antonio Dobado and
Antonio L. Maroto | Indirect signals from braneworlds | 7 pages, 1 figure. Contributed to XXIII International Symposium on
Lepton and Photon Interactions at High Energy, Aug 13-18, Daegu, Korea | null | null | S11-366, ABS-S11-010 | astro-ph hep-ph | null | It has been suggested that our universe could be a 3-dimensional brane where
the SM fields live embedded in a D-dimensional space-time. In flexible
raneworlds, in addition to the SM fields, new degrees of freedom appear on the
brane associated to brane fluctuations. These new fields, known as branons, are
standard WIMPs (Weakly Interacting Massive Particles) and therefore natural
dark matter candidates, whose spontaneous annihilations can provide first
evidences for this scenario.
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 18:55:08 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"de la Cruz-Dombriz",
"Alvaro",
""
],
[
"Dobado",
"Antonio",
""
],
[
"Maroto",
"Antonio L.",
""
]
] |
0708.0236 | Richard Henry | R.B.C. Henry (U. Oklahoma) and Jason X. Prochaska (UCSC/Lick) | The Chemical Evolution Of High Z Galaxies From The Relative Abundances
Of N, Si, S, And Fe In Damped Lyman Alpha Systems | 32 pages, 9 figures; to appear in PASP, September, 2007 | null | 10.1086/522038 | null | astro-ph | null | Abundances of N, Si, S, and Fe for 45 damped Lyman alpha systems (DLAs) have
been compiled and detailed one-zone chemical evolution models have been
constructed for 30 of them. Assuming continuous star formation, we found that
final abundances in each object can be modelled by adjusting only two
parameters, i.e. its time-averaged star formation efficiency and evolutionary
age, with ranges in our sample of 0.01-1.5 Gyr^-1 and 0.18-2.0 Gyr,
respectively. In addition, average star formation efficiency and evolutionary
age appear to be anticorrelated for the sample, suggesting that the star
formation efficiency in a typical DLA decreases with age. At the same time,
N/Si in DLAs is directly linked to an object's age. There is an apparent
bimodality in the distribution of N/Si values which could be the result of a
statistical accident or an effect produced by a truncated or flattened IMF. We
find that the mean and small dispersion of Si/Fe values is related to the
generally young ages of DLAs, wherein not all Fe has yet been expelled by Type
Ia supernovae. Finally, the large scatter and generally lower values of N/Si of
DLAs with respect to blue compact galaxies, despite their partially overlapping
metallicities, indicate that DLAs are generally younger than the latter.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:32:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Henry",
"R. B. C.",
"",
"U. Oklahoma"
],
[
"Prochaska",
"Jason X.",
"",
"UCSC/Lick"
]
] |
0708.0237 | Gregg S. Jaeger | Gregg Jaeger | Fractal states in quantum information processing | null | Physics Letters A, 358, 373 (2006) | 10.1016/j.physleta.2006.05.053 | null | quant-ph | null | The fractal character of some quantum properties has been shown for systems
described by continuous variables. Here, a definition of quantum fractal states
is given that suits the discrete systems used in quantum information
processing, including quantum coding and quantum computing. Several important
examples are provided.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:32:51 GMT"
}
] | 2007-08-03T00:00:00 | [
[
"Jaeger",
"Gregg",
""
]
] |
0708.0238 | Wschebor Nicolas | Federico Benitez, Ramon Mendez Galain and Nicolas Wschebor | On the 2-point function of the O(N) model | null | Phys.Rev.B77:024431,2008 | 10.1103/PhysRevB.77.024431 | null | cond-mat.stat-mech hep-th | null | The self-energy of the critical 3-dimensional O(N) model is calculated. The
analysis is performed in the context of the Non-Perturbative Renormalization
Group, by exploiting an approximation which takes into account contributions of
an infinite number of vertices. A very simple calculation yields the 2-point
function in the whole range of momenta, from the UV Gaussian regime to the
scaling one. Results are in good agreement with best estimates in the
literature for any value of N in all momenta regimes. This encourages the use
of this simple approximation procedure to calculate correlation functions at
finite momenta in other physical situations.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 21:52:28 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Benitez",
"Federico",
""
],
[
"Galain",
"Ramon Mendez",
""
],
[
"Wschebor",
"Nicolas",
""
]
] |
0708.0239 | J. A. R. Cembranos | Jose A. R. Cembranos, Jonathan L. Feng, Louis E. Strigari | Minimal Universal Extra Dimensions | 6 pages, 3 figures. Contributed to XXIII International Symposium on
Lepton and Photon Interactions at High Energy, Aug 13-18, 2007, Daegu, Korea | null | 10.1103/PhysRevD.75.036004 | S3-4-228, ABS-S3-4-013 | hep-ph | null | Highly degenerate spectra associated with universal extra dimensions (UED)
provide an interesting phenomenology not only from the point of view of
cosmology and astrophysics, but also for colliders. We study these exotic
signals for the simplest case, called minimal UED, where it is natural to find
slow charged particles, displaced vertices, tracks with non-vanishing impact
parameters, track kinks, and even vanishing charged tracks.
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 19:37:16 GMT"
}
] | 2015-06-30T00:00:00 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Feng",
"Jonathan L.",
""
],
[
"Strigari",
"Louis E.",
""
]
] |
0708.0240 | Reza Fraeghbal | H. Arfaei, R. Fareghbal | Double Horizon Limit, AdS Geometry and Entropy Function | 19 pages- minor correction - published version | Nucl.Phys.B802:405-420,2008 | 10.1016/j.nuclphysb.2008.04.017 | IPM/P-2007/050, SUT-P-07-2b | hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We start from a generic metric which describes four dimensional stationary
black holes in an arbitrary theory of gravity and show that the AdS_2 part of
the near horizon geometry is a consequence of the double-horizon limit and
finiteness . We also show that the field configurations of the near horizon are
determined if the same conditions are applied to the equations of motion. This
is done by showing that in the double-horizon limit field equations at the
horizon decouple from the bulk of the space. Solving these equations gives the
near horizon field configurations. It is shown that these decoupled equations
can be obtained from an action derived from the original action by applying the
double-horizon condition. Our results agree with the entropy function method.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 23:02:01 GMT"
},
{
"version": "v2",
"created": "Mon, 19 Nov 2007 11:01:04 GMT"
},
{
"version": "v3",
"created": "Sat, 12 Jul 2008 08:11:30 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Arfaei",
"H.",
""
],
[
"Fareghbal",
"R.",
""
]
] |
0708.0241 | Serkant Ali Cetin | E. Arik (Bogazici Univ., Istanbul, Turkey), S. A. Cetin (Dogus Univ.,
Istanbul, Turkey), S. Sultansoy (TOBB ET Univ., Ankara, Turkey and Institute
of Physics, Baku, Azerbaijan) | The impact of the fourth SM family on the Higgs observability at the LHC | 4pages, 6 figures | Balkan Phys.Lett.15N4:1-5,2007 | null | null | hep-ph | null | It is shown that if the fourth SM fermion family exists then the Higgs boson
could be observed at the LHC with an integrated luminosity of few fb-1. The
Higgs discovery potential for different channels is discussed in the presence
of the fourth SM family.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 22:34:38 GMT"
}
] | 2009-01-01T00:00:00 | [
[
"Arik",
"E.",
"",
"Bogazici Univ., Istanbul, Turkey"
],
[
"Cetin",
"S. A.",
"",
"Dogus Univ.,\n Istanbul, Turkey"
],
[
"Sultansoy",
"S.",
"",
"TOBB ET Univ., Ankara, Turkey and Institute\n of Physics, Baku, Azerbaijan"
]
] |
0708.0242 | Usman Khan | Usman A. Khan and Jose M. F. Moura | Distributing the Kalman Filter for Large-Scale Systems | null | U. A. Khan and J. M. F. Moura, "Distributing the Kalman filter for
large-scale systems," IEEE Transactions on Signal Processing, vol. 56, Part
1, no. 10, pp. 4919-4935, Oct. 2008 | 10.1109/TSP.2008.927480 | null | cs.IT math.IT | null | This paper derives a \emph{distributed} Kalman filter to estimate a sparsely
connected, large-scale, $n-$dimensional, dynamical system monitored by a
network of $N$ sensors. Local Kalman filters are implemented on the
($n_l-$dimensional, where $n_l\ll n$) sub-systems that are obtained after
spatially decomposing the large-scale system. The resulting sub-systems
overlap, which along with an assimilation procedure on the local Kalman
filters, preserve an $L$th order Gauss-Markovian structure of the centralized
error processes. The information loss due to the $L$th order Gauss-Markovian
approximation is controllable as it can be characterized by a divergence that
decreases as $L\uparrow$. The order of the approximation, $L$, leads to a lower
bound on the dimension of the sub-systems, hence, providing a criterion for
sub-system selection. The assimilation procedure is carried out on the local
error covariances with a distributed iterate collapse inversion (DICI)
algorithm that we introduce. The DICI algorithm computes the (approximated)
centralized Riccati and Lyapunov equations iteratively with only local
communication and low-order computation. We fuse the observations that are
common among the local Kalman filters using bipartite fusion graphs and
consensus averaging algorithms. The proposed algorithm achieves full
distribution of the Kalman filter that is coherent with the centralized Kalman
filter with an $L$th order Gaussian-Markovian structure on the centralized
error processes. Nowhere storage, communication, or computation of
$n-$dimensional vectors and matrices is needed; only $n_l \ll n$ dimensional
vectors and matrices are communicated or used in the computation at the
sensors.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 22:47:10 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 07:15:39 GMT"
}
] | 2013-12-19T00:00:00 | [
[
"Khan",
"Usman A.",
""
],
[
"Moura",
"Jose M. F.",
""
]
] |
0708.0243 | Jason Barnes | Jason W. Barnes | Effects of Orbital Eccentricity on Extrasolar Planet Transit Detection
and Lightcurves | 8 pages, 6 figures, to appear in PASP 2007 September | null | 10.1086/522039 | null | astro-ph | null | It is shown herein that planets with eccentric orbits are more likely to
transit than circularly orbiting planets with the same semimajor axis by a
factor of (1-e^2)^{-1}. If the orbital parameters of discovered transiting
planets are known, as from follow-up radial velocity observations, then the
transit-detected planet population is easily debiased of this effect. The
duration of a planet's transit depends upon of its eccentricity and longitude
of periastron; transits near periastron are shorter, and those near apoastron
last longer, for a given impact parameter. If fitting for the stellar radius
with the other transit parameters, this effect causes a systematic error in the
resulting measurements. If the stellar radius is instead held fixed at a value
measured independently, then it is possible to place a lower limit on the
planet's eccentricity using photometry alone. Orbital accelerations cause a
difference in the planet's ingress and egress durations that lead to an
asymmetry in the transit lightcurve that could be used along with the transit
velocity measurement to uniquely measure the planet's eccentricity and
longitude of periapsis. However, the effect is too small to be measured with
current technology. The habitability of transiting terrestrial planets found by
Kepler depends on those planets' orbital eccentricities. While Kepler will be
able to place lower limits on those planets' orbital eccentricity, the actual
value for any given planet will likely remain unknown.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 23:30:53 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barnes",
"Jason W.",
""
]
] |
0708.0244 | Inanc Adagideli | I. Adagideli, M. Scheid, M. Wimmer, G.E.W. Bauer, and K. Richter | Extracting current-induced spins: spin boundary conditions at narrow
Hall contacts | 18 pages, 7 figures, submitted to NJP focus issue on Spintronics | New J. Phys. 9, 382 (2007) | 10.1088/1367-2630/9/10/382 | null | cond-mat.mes-hall | null | We consider the possibility to extract spins that are generated by an
electric current in a two-dimensional electron gas with Rashba-Dresselhaus
spin-orbit interaction (R2DEG) in the Hall geometry. To this end, we discuss
boundary conditions for the spin accumulations between a spin-orbit coupled
region and contact without spin-orbit coupling, i.e. a normal two-dimensional
electron gas (2DEG). We demonstrate that in contrast to contacts that extend
along the whole sample, a spin accumulation can diffuse into the normal region
through finite contacts and detected by e.g. ferromagnets. For an
impedance-matched narrow contact the spin accumulation in the 2DEG is equal to
the current induced spin accumulation in the bulk of R2DEG up to a
geometry-dependent numerical factor.
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 08:41:50 GMT"
}
] | 2007-11-28T00:00:00 | [
[
"Adagideli",
"I.",
""
],
[
"Scheid",
"M.",
""
],
[
"Wimmer",
"M.",
""
],
[
"Bauer",
"G. E. W.",
""
],
[
"Richter",
"K.",
""
]
] |
0708.0245 | Aidan Sims | David I. Robertson and Aidan Sims | Simplicity of C*-algebras associated to row-finite locally convex
higher-rank graphs | 18 pages, 1 figure, figure drawn using Tikz/PGF. Version 2: the
hypothesis "with no sources" has been removed from Theorem 3.4; it appeared
there in error since the main point of the theorem is that it applies in the
absence of this hypothesis (cf Theorem 3.1 of arXiv:math/0602120) | null | null | null | math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous work, the authors showed that the C*-algebra C*(\Lambda) of a
row-finite higher-rank graph \Lambda with no sources is simple if and only if
\Lambda is both cofinal and aperiodic. In this paper, we generalise this result
to row-finite higher-rank graphs which are locally convex (but may contain
sources). Our main tool is Farthing's "removing sources" construction which
embeds a row-finite locally convex higher-rank graph in a row-finite
higher-rank graph with no sources in such a way that the associated C*-algebras
are Morita equivalent.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 23:41:28 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Jan 2010 22:26:27 GMT"
}
] | 2010-01-13T00:00:00 | [
[
"Robertson",
"David I.",
""
],
[
"Sims",
"Aidan",
""
]
] |
0708.0246 | Aidan Schofield | Aidan Schofield | Severe right Ore sets and universal localisation | null | null | null | null | math.RA | null | We introduce the notion of a severe right Ore set in the main as a tool to
study universal localisations of rings but also to provide a short proof of P.
M. Cohn's classification of homomorphisms from a ring to a division ring. We
prove that the category of finitely presented modules over a universal
localisation is equivalent to a localisation at a severe right Ore set of the
category of finitely presented modules over the original ring. This allows us
to describe the structure of finitely presented modules over the universal
localisation as modules over the original ring.
| [
{
"version": "v1",
"created": "Wed, 1 Aug 2007 23:54:56 GMT"
}
] | 2007-08-03T00:00:00 | [
[
"Schofield",
"Aidan",
""
]
] |
0708.0247 | J. A. R. Cembranos | Jose A. R. Cembranos, Jonathan L. Feng, Louis E. Strigari | Dark Matter Decaying Now | 6 pages, 2 figures. Contributed to XXIII International Symposium on
Lepton and Photon Interactions at High Energy, Aug 13-18, 2007, Daegu, Korea | null | null | S15-369, ABS-S15-006 | astro-ph hep-ph | null | The instability of dark matter may produce visible signals in the spectrum of
cosmic gamma-rays. We consider this possibility in frameworks with additional
spatial dimensions and supersymmetry. Examples of particles include
superweakly-interacting massive particles such as gravitinos in supersymmetry
models, the lightest Kaluza-Klein (KK) state in models with universal extra
dimensions, and weakly-interacting massive particles such as branons in
flexible brane-worlds.
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 19:55:12 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Feng",
"Jonathan L.",
""
],
[
"Strigari",
"Louis E.",
""
]
] |
0708.0248 | Carlos E. Yaguna | Carlos E. Yaguna (UCLA) | Higgs decays in supersymmetric models with light neutralinos | 9 pages, 5 figures | Phys.Rev.D76:075017,2007 | 10.1103/PhysRevD.76.075017 | null | hep-ph | null | In the Minimal Supersymmetric Standard Model, neutralinos lighter than 50 GeV
are compatible with all accelerator, precision, and cosmological bounds. Such
neutralinos might constitute a relevant decay channel for the Higgs boson,
modifying its expected signatures at hadron colliders. We study the branching
ratio h --> \chi\chi and determine the region in the supersymmetric parameter
space where it is sizable. We have found that, in fact, the Higgs may
dominantly decay into neutralino pairs. Besides, as a result of this new
channel, the branching ratio into visible modes, such as h --> \gamma\gamma,
gets suppressed.
| [
{
"version": "v1",
"created": "Thu, 2 Aug 2007 00:47:34 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yaguna",
"Carlos E.",
"",
"UCLA"
]
] |
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