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712.0979 | Gunnar Pruessner | Gunnar Pruessner | Equivalence of conditional and external field ensembles in absorbing
state phase transitions | 6 pages (single column), 2 figures, RevTeX | Phys. Rev. E 76, 061103 (2007) | 10.1103/PhysRevE.76.061103 | null | cond-mat.stat-mech | null | I comment on the relation between two sampling methods for absorbing state
models. It is shown that a certain ensemble without external field conditional
to activity coincides with the unconditional ensemble for sufficiently small
external field. The actual physical processes involved are identical and the
derivation of the identity of the scaling behaviour relies on a single
(established) scaling law. While the conditional ensemble by construction does
not contain information about the system with large external field, it contains
all information about the limit of vanishing external field and about the
vicinity of the critical point: Finite size scaling as well as critical scaling
in the temperature-like variable or in (small) external field.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:02:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pruessner",
"Gunnar",
""
]
] | [
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] |
712.098 | Jie Sun | Jie Sun, Peng Jin, Chang Zhao, Like Yu, Xiaoling Ye, Bo Xu, Yonghai
Chen, and Zhanguo Wang | Electron resonant tunneling through InAs/GaAs quantum dots embedded in a
Schottky diode with an AlAs insertion layer | null | null | null | null | cond-mat.mes-hall | null | Molecular beam epitaxy is employed to manufacture self-assembled InAs/GaAs
quantum dot Schottky resonant tunneling diodes. By virtue of a thin AlAs
insertion barrier, the thermal current is effectively reduced and electron
resonant tunneling through quantum dots under both forward and reverse biased
conditions is observed at relatively high temperature of 77K. The ground states
of quantum dots are found to be at ~0.19eV below the conduction band of GaAs
matrix. The theoretical computations are in conformity with experimental data.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 15:56:14 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Sun",
"Jie",
""
],
[
"Jin",
"Peng",
""
],
[
"Zhao",
"Chang",
""
],
[
"Yu",
"Like",
""
],
[
"Ye",
"Xiaoling",
""
],
[
"Xu",
"Bo",
""
],
[
"Chen",
"Yonghai",
""
],
[
"Wang",
"Zhanguo",
""
]
] | [
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] |
712.0981 | Svetlana Varchenko | E. Mukhin, V. Tarasov, A. Varchenko | On separation of variables and completeness of the Bethe ansatz for
quantum gl_N Gaudin model | Latex, 9 pages | null | null | null | math.QA math.AG | null | In this note, we discuss implications of the results obtained in [MTV4]. It
was shown there that eigenvectors of the Bethe algebra of the quantum gl_N
Gaudin model are in a one-to-one correspondence with Fuchsian differential
operators with polynomial kernel. Here, we interpret this fact as a separation
of variables in the gl_N Gaudin model. Having a Fuchsian differential operator
with polynomial kernel, we construct the corresponding eigenvector of the Bethe
algebra. It was shown in [MTV4] that the Bethe algebra has simple spectrum if
the evaluation parameters of the Gaudin model are generic. In that case, our
Bethe ansatz construction produces an eigenbasis of the Bethe algebra.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 15:59:43 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Mukhin",
"E.",
""
],
[
"Tarasov",
"V.",
""
],
[
"Varchenko",
"A.",
""
]
] | [
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] |
712.0982 | Michael Bachmann | Christoph Junghans, Michael Bachmann, Wolfhard Janke | Thermodynamics of Peptide Aggregation Processes. An Analysis from
Perspectives of Three Statistical Ensembles | 10 pages, 8 figures | J. Chem. Phys. 128, 085103 (2008). | 10.1063/1.2830233 | null | cond-mat.soft | null | We employ a mesoscopic model for studying aggregation processes of
protein-like hydrophobic-polar heteropolymers. By means of multicanonical Monte
Carlo computer simulations, we find strong indications that peptide aggregation
is a phase separation process, in which the microcanonical entropy exhibits a
convex intruder due to nonnegligible surface effects of the small systems. We
analyze thermodynamic properties of the conformational transitions accompanying
the aggregation process from the multicanonical, canonical, and microcanonical
perspective. It turns out that the microcanonical description is particularly
advantageous as it allows for unraveling details of the phase-separation
transition in the thermodynamic region, where the temperature is not a suitable
external control parameter anymore.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:00:41 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Junghans",
"Christoph",
""
],
[
"Bachmann",
"Michael",
""
],
[
"Janke",
"Wolfhard",
""
]
] | [
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712.0983 | Davina Innes | D.E. Innes | SUMER-Hinode observations of microflares: excitation of molecular
hydrogen | 4 pages, 4 figures, accepted by A&A | null | 10.1051/0004-6361:20078977 | null | astro-ph | null | Concentrations of molecular hydrogen (H2) have been detected by SUMER in
active region plage. The H2 is excited by O VI line emission at 1031.94 A
which, although not observed, must be brightening along with the observed
transition region line, Si III 1113.24 A. We have made co-ordinated
observations of active region plage with the spectrometer SUMER/SoHO in lines
of H2 1119.10 A and Si III 1113.24 A and with XRT/Hinode X-ray and SOT/Hinode
Ca II filters. In six hours of observation, six of the seven H2 events seen
occurred near a footpoint of a brightening X-ray loop. The seventh is
associated with an unusually strong Si III plasma outflow. We conclude that
microflare energy dissipation heats the chromosphere, reducing its opacity, so
that O VI microflare emission is able to reach the lower layers of the
chromosphere and excite the H2.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:01:37 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Innes",
"D. E.",
""
]
] | [
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] |
712.0984 | Lars Bergstrom | Lars Bergstrom | Antimatter and Gamma-rays from Dark Matter Annihilation | 7p, one fig., invited talk at TAUP 2007, Sendai, Japan, to appear in
the Proceedings | J.Phys.Conf.Ser.120:042005,2008 | 10.1088/1742-6596/120/4/042005 | null | astro-ph hep-ph | null | A brief review of the indirect detection signatures of dark matter is given.
In particular, detection methods of dark matter particle annihilation to
antimatter and gamma-rays are reviewed. With the GLAST satellite soon to be
launched, a crucial window in the energy range of a few GeV up to 300 GeV will
open. The good angular and energy resolution of the instrument means that
structures predicted by cold dark matter models can be searched for. Large,
currently planned ground-based imaging Cherenkov telescope arrays, may further
improve the limits, or discover a signal, if the current understanding of halo
dark matter structure is correct.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:10:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bergstrom",
"Lars",
""
]
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] |
712.0985 | Jozef H. Przytycki | Mieczyslaw K.Dabkowski (University of Texas at Dallas), Makiko
Ishiwata (Osaka City University), and Jozef H.Przytycki (George Washington
University) | 5-move equivalence classes of links and their algebraic invariants | 41 pages, 34 figures; to appear in JKTR 16(10), December, 2007 | null | null | null | math.GT | null | We start a systematic analysis of links up to 5-move equivalence. Our
motivation is to develop tools which later can be used to study skein modules
based on the skein relation being deformation of a 5-move (in an analogous way
as the Kauffman skein module is a deformation of a 2-move, i.e. a crossing
change). Our main tools are Jones and Kauffman polynomials and the fundamental
group of the 2-fold branch cover of S^3 along a link. We use also the fact that
a 5-move is a composition of two rational \pm (2,2)-moves (i.e. \pm 5/2-moves)
and rational moves can be analyzed using the group of Fox colorings and its
non-abelian version, the Burnside group of a link. One curious observation is
that links related by one (2,2)-move are not 5-move equivalent. In particular,
we partially classify (up to 5-moves)
3-braids, pretzel and Montesinos links, and links up to 9 crossings.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 05:11:41 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Dabkowski",
"Mieczyslaw K.",
"",
"University of Texas at Dallas"
],
[
"Ishiwata",
"Makiko",
"",
"Osaka City University"
],
[
"Przytycki",
"Jozef H.",
"",
"George Washington\n University"
]
] | [
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] |
712.0986 | Mason A. Porter | A. S. Rodrigues, P. G. Kevrekidis, Mason A. Porter, D. J.
Frantzeskakis, P. Schmelcher, and A. R. Bishop | Matter-wave solitons with a periodic, piecewise-constant nonlinearity | 16 pages, 7 figures (some with multiple parts), to appear in Physical
Review A | null | 10.1103/PhysRevA.78.013611 | null | nlin.PS cond-mat.other math.DS physics.atom-ph | null | Motivated by recent proposals of ``collisionally inhomogeneous''
Bose-Einstein condensates (BECs), which have a spatially modulated scattering
length, we study the existence and stability properties of bright and dark
matter-wave solitons of a BEC characterized by a periodic, piecewise-constant
scattering length. We use a ``stitching'' approach to analytically approximate
the pertinent solutions of the underlying nonlinear Schr\"odinger equation by
matching the wavefunction and its derivatives at the interfaces of the
nonlinearity coefficient. To accurately quantify the stability of bright and
dark solitons, we adapt general tools from the theory of perturbed Hamiltonian
systems. We show that solitons can only exist at the centers of the constant
regions of the piecewise-constant nonlinearity. We find both stable and
unstable configurations for bright solitons and show that all dark solitons are
unstable, with different instability mechanisms that depend on the soliton
location. We corroborate our analytical results with numerical computations.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:26:08 GMT"
},
{
"version": "v2",
"created": "Mon, 26 May 2008 14:23:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rodrigues",
"A. S.",
""
],
[
"Kevrekidis",
"P. G.",
""
],
[
"Porter",
"Mason A.",
""
],
[
"Frantzeskakis",
"D. J.",
""
],
[
"Schmelcher",
"P.",
""
],
[
"Bishop",
"A. R.",
""
]
] | [
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] |
712.0987 | Juan Carlos Pardo Millan | A.E. Kyprianou and J.C. Pardo | On continuous state branching processes: conditioning and
self-similarity | null | null | null | null | math.PR | null | In this paper, for $\alpha\in (1, 2}$ we show that the $\alpha$-stable
continuous-state branching process and the associated process conditioned never
to become extinct are positive self-similar Markov processes. Understanding the
interaction of the Lamperti transformation for continuous-state branching
processes and the Lamperti transformation for positive self-similar Markov
processes permits accessto a number of explicit results concerning the paths of
stable-continuous branching processes and its conditioned version.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:53:18 GMT"
}
] | 2008-12-08T00:00:00 | [
[
"Kyprianou",
"A. E.",
""
],
[
"Pardo",
"J. C.",
""
]
] | [
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] |
712.0988 | Christian Knigge | A. R. Witham (1), C. Knigge (1), J. E. Drew (2), R. Greimel (3,4), D.
Steeghs (5,6), B. T. Gaensicke (5), P. J. Groot (7), A. Mampaso (8) ((1)
University of Southampton, (2) Imperial College London, (3) Isaac Newton
Group of Telescopes, (4) University of Graz, (5) University of Warwick, (6)
Harvard-Smithsonian Center for Astrophysics, (7) Radboud University Nijmegen,
(8) Instituto de Astrofisica de Canarias) | The IPHAS Catalogue of Halpha Emission Line Sources in the Northern
Galactic Plane | 13 pages, 10 figures, accepted for publication in MNRAS. The paper
itself contains only an abridged version of the catalogue; the full catalogue
is available from http://www.astro.soton.ac.uk/~christian/ (under the IPHAS
link). The emitter catalogue will also be made available via CDS and
alongside the IPHAS Initidal Data Release (http://idr.iphas.org) | null | 10.1111/j.1365-2966.2007.12774.x | null | astro-ph | null | We present a catalogue of point-source Halpha emission line objects selected
from the INT/WFC Photometric H$\alpha$ Survey of the Northern Galactic Plane
(IPHAS). The catalogue covers the magnitude range 13 < r' < 19.5 and includes
northern hemisphere sources in the Galactic latitude range -5 < b < 5 degress.
It is derived from ~1500 square degress worth of imaging data, which represents
80 percent of the final IPHAS survey area. The electronic version of the
catalogue will be updated once the full survey data becomes available. In
total, the present catalogue contains 4853 point sources that exhibit strong
photometric evidence for Halpha emission. We have so far analyzed spectra for
~300 of these sources, confirming more than 95 percent of them as genuine
emission-line stars. A wide range of stellar populations are represented in the
catalogue, including early-type emission line stars, active late-type stars,
interacting binaries, young stellar objects and compact nebulae.
The spatial distribution of catalogue objects shows overdensities near sites
of recent or current star formation, as well as possible evidence for the warp
of the Galactic plane. Photometrically, the incidence of Halpha emission is
bimodally distributed in r'-i'. The blue peak is made up mostly of early-type
emission line stars, whereas the red peak may signal an increasing contribution
from other objects, such as young/active low-mass stars. We have cross-matched
our Halpha-excess catalogue against the emission-line star catalogue of
Kohoutek & Wehmeyer, as well as against sources in SIMBAD. We find that fewer
than 10 per cent of our sources can be matched to known objects of any type.
Thus IPHAS is uncovering an order of magnitude more faint (r' > 13) emission
line objects than were previously known in the Milky Way.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:45:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Witham",
"A. R.",
""
],
[
"Knigge",
"C.",
""
],
[
"Drew",
"J. E.",
""
],
[
"Greimel",
"R.",
""
],
[
"Steeghs",
"D.",
""
],
[
"Gaensicke",
"B. T.",
""
],
[
"Groot",
"P. J.",
""
],
[
"Mampaso",
"A.",
""
]
] | [
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712.0989 | Assani | I. Assani and Z. Buczolich | A maximal inequality for the tail of the bilinear Hardy-Littlewood
function | This is the final and simplified version of the paper previously
uploaded with the same title. The paper has been refereed and will appear in
Cont. Math. The maximal inequality has been simplified as stated in this new
abstract | null | null | null | math.DS | null | Let $(X,\mathcal{B}, \mu, T)$ be an ergodic dynamical system on a non-atomic
finite measure space. We assume without loss of generality that $\mu(X)=1.$
Consider the maximal function $\dis R^*:(f, g) \in L^p\times L^q \to R^*(f,
g)(x) = \sup_{n\geq 1} \frac{f(T^nx)g(T^{2n}x)}{n}.$ We obtain the following
maximal inequality. For each $1<p\leq \infty$ there exists a finite constant
$C_p$ such that for each $\lambda >0,$ and nonnegative functions $f\in L^p$ and
$g\in L^1$
\mu\{x: R^*(f,g)(x)>\lambda\} \leq
C_p \bigg(\frac{\|f\|_p\|g\|_1}{\lambda}\bigg)^{1/2}.
We also show that for each $\alpha>2$ the maximal function $R^*(f,g)$ is a.e.
finite for pairs of functions $(f,g)\in (L(\log L)^{2\alpha}, L^1)$.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:30:50 GMT"
},
{
"version": "v2",
"created": "Tue, 29 Jan 2008 18:59:05 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Assani",
"I.",
""
],
[
"Buczolich",
"Z.",
""
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712.099 | Dagomir Kaszlikowski | Dagomir Kaszlikowski and Marcin Wiesniak | Off-Diagonal-Long-Range-Order Versus Entanglement | 4 pages | null | null | null | quant-ph | null | In this short note we discuss the relation between the so-called
Off-Diagonal-Long-Range-Order in many-body interacting quantum systems
introduced by C. N. Yang in Rev. Mod. Phys. {\bf 34}, 694 (1962) and
entanglement. We argue that there is a direct relation between these two
concepts.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:49:21 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Kaszlikowski",
"Dagomir",
""
],
[
"Wiesniak",
"Marcin",
""
]
] | [
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] |
712.0991 | Esa R\"as\"anen | E. Rasanen, H. Saarikoski, A. Harju, M. Ciorga, A. S. Sachrajda | Spin-droplets in confined quantum Hall systems | To appear in Phys. Rev. B (Rapid. Comm.) | Phys. Rev. B 77, 041302(R) (2008) | 10.1103/PhysRevB.77.041302 | null | cond-mat.str-el cond-mat.mes-hall | null | Two-dimensional semiconductor quantum dots are studied in the the
filling-factor range 2<v<3. We find both theoretical and experimental evidence
of a collective many-body phenomenon, where a fraction of the trapped electrons
form an incompressible spin-droplet on the highest occupied Landau level. The
phenomenon occurs only when the number of electrons in the quantum dot is
larger than ~30. We find the onset of the spin-droplet regime at v=5/2. This
proposes a finite-geometry alternative to the Moore-Read-type Pfaffian state of
the bulk two-dimensional electron gas. Hence, the spin-droplet formation may be
related to the observed fragility of the v=5/2 quantum Hall state in narrow
quantum point contacts.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:01:02 GMT"
}
] | 2008-05-08T00:00:00 | [
[
"Rasanen",
"E.",
""
],
[
"Saarikoski",
"H.",
""
],
[
"Harju",
"A.",
""
],
[
"Ciorga",
"M.",
""
],
[
"Sachrajda",
"A. S.",
""
]
] | [
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] |
712.0992 | A. Mobius | A. Mobius | Indications for sharp continuous phase transitions at finite
temperatures connected with the apparent metal-insulator transition in
two-dimensional disordered systems | Revised version (quantitative determination of exponent beta added),
accepted for publication by Physical Review B. Revtex, 10 pages, 9 figures | Phys. Rev. B 77, 205317 (2008) | 10.1103/PhysRevB.77.205317 | null | cond-mat.str-el cond-mat.dis-nn | null | In a recent experiment, Lai et al. [Phys. Rev. B 75, 033314 (2007)] studied
the apparent metal-insulator transition (MIT) of a Si quantum well structure
tuning the charge carrier concentration $n$. They observed linear temperature
dependences of the conductivity $\sigma(T,n)$ around the Fermi temperature and
found that the corresponding $T \to 0$ extrapolation $\sigma_0(n)$ exhibits a
sharp bend just at the MIT. Here, reconsidering the data published by Lai et
al., it is shown that this sharp bend is related to a peculiarity of
$\sigma(T=const.,n)$ clearly detectable in the whole $T$ range up to 4 K, the
highest measuring temperature in that work. Since this peculiarity seems not to
be smoothed out with increasing $T$ it may indicate a sharp continuous phase
transition between the regions of apparent metallic and activated conduction to
be present at finite temperature. Hints from the literature of such a behavior
are discussed. Finally, a scaling analysis illuminates similarities to previous
experiments and provides understanding of the shape of the peculiarity and of
sharp peaks found in $d log_{10} \sigma / d n (n)$.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:51:14 GMT"
},
{
"version": "v2",
"created": "Mon, 5 May 2008 10:25:25 GMT"
}
] | 2008-05-20T00:00:00 | [
[
"Mobius",
"A.",
""
]
] | [
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] |
712.0993 | Kostyantyn Ropotenko | K. Ropotenko | The Poincar\'e recurrence time for the de Sitter space with dynamical
chaos | 5 pages, no figures | null | null | null | gr-qc | null | For an ordinary thermodynamical system the Poincar\'{e} recurrence time is
exponentially large in the Boltzmann entropy of the system. It turns out, that
for a system with dynamical chaos it is determined by the Kolmogorov-Sinai
entropy and can be considerably shorter. It is shown in this note that for the
de Sitter space with strong mixing properties the mean recurrence time is equal
to the inverse Hubble constant. This means that our universe can have a finite
lifetime bounded by the current age of the universe. After this time, the
universe should recycle itself and this process has neither a beginning nor an
end.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 16:53:09 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Ropotenko",
"K.",
""
]
] | [
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] |
712.0994 | Toshihiro Kawaguchi Dr. | T. Kawaguchi, K. Nakanishi, K. Kohno, K. Ohta, K. Aoki | First Detection of 12CO (1--0) Emission from Two Narrow-Line Seyfert 1
Galaxies | 29 pages, 8 figures, Accepted for publication in The Astrophysical
Journal | ApJ 676 (2008) 137 | 10.1086/527539 | null | astro-ph | null | In order to investigate how the growth of galactic bulges progresses with the
growth of central black holes (BHs), we observed molecular gas (fuel for the
coming star formation) in possibly young active galaxies, narrow-line Seyfert 1
galaxies (NLS1s). We present the results of radio observations of 12CO(1--0)
using the Nobeyama Millimeter Array (with 2--4 kpc spatial resolution) for two
FIR-bright NLS1s, yielding the first detection of their CO emission.
Corresponding molecular--gas masses M(H2) of (1-3) X 109 Msun are the 2nd and
4th largest ones among NLS1s. By estimating dynamical masses and bulge masses
M(bulge) for these two NLS1s using CO channel map and CO line widths, we found
M(H2) amount to 0.13--0.35 of these masses. Taking account the star formation
efficiency (~ 0.1), the increase in M(bulge) in those NLS1s in the near future
(~< 10^{7.5} yr) is expected not to be a huge fraction (1--5% of the
preexisting stars). Bulge growth may have finished before BH growth, or
bulge--BH coevolution may proceed with many, occasional discrete events, where
one coevolution event produces only a small amount of mass growth of BHs and of
bulges. We also discuss the ratios of star-formation rate--to--gas accretion
rate onto BHs, finding that two NLS1s have very small ratios (~ 1) compared
with the M(bulge)/M(BH) ratios found in active and inactive galaxies (~ 700).
This huge difference suggests either the non-overlapped coevolution, long star
formation duration or temporarily high accretion rate during NLS1 phase.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 19:36:02 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kawaguchi",
"T.",
""
],
[
"Nakanishi",
"K.",
""
],
[
"Kohno",
"K.",
""
],
[
"Ohta",
"K.",
""
],
[
"Aoki",
"K.",
""
]
] | [
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] |
712.0995 | Jose Ricardo Marinelli | S.S. Avancini, J.R. Marinelli, D.P. Menezes, M.M.W. Moraes and A.S.
Schneider | Reexamining the neutron skin thickness within a density dependent
hadronic model | 7 pages, 6 figures and 2 tables. Accepted for publication in Physical
Review C | Phys.Rev.C76:064318,2007 | 10.1103/PhysRevC.76.064318 | null | nucl-th | null | We calculate the skin thickness, binding energy, surface energy and density
profiles within the Dirac solution of a density dependent hadronic model and
compare with the NL3 parametrization results of the non-linear Wallecka model.
The asymmetry for polarized electron scattering is also obtained using a
partial wave expansion calculation. Results for 208Pb, 40Ca, 48Ca, 66Ni and
90Zr are shown and discussed.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:01:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Avancini",
"S. S.",
""
],
[
"Marinelli",
"J. R.",
""
],
[
"Menezes",
"D. P.",
""
],
[
"Moraes",
"M. M. W.",
""
],
[
"Schneider",
"A. S.",
""
]
] | [
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] |
712.0996 | Valery A. Lunts | Valery A. Lunts | Formality of DG algebras (after Kaledin) | Revised and expanded version | null | null | null | math.AG math.KT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide proper foundations and proofs for the main results of [Ka]. The
results include a flat base change for formality and behavior of formality in
flat families of $A(\infty)$ and DG algebras.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:41:58 GMT"
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{
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"version": "v3",
"created": "Wed, 2 Jan 2008 16:22:18 GMT"
},
{
"version": "v4",
"created": "Thu, 17 Sep 2009 15:51:35 GMT"
}
] | 2009-09-17T00:00:00 | [
[
"Lunts",
"Valery A.",
""
]
] | [
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712.0997 | Andr\'es Fernando Reyes Lega | Kai Johannes Keller (1 and 2), Nikolaos A. Papadopoulos (2) and
Andr\'es F. Reyes-Lega (3) ((1) II. Inst. f. Theoretische Physik der
Universit\"at Hamburg, Germany, (2) Inst. f. Physik (WA THEP) der Johannes
Gutenberg-Universit\"at Mainz, Germany, (3) Departamento de F\'isica,
Universidad de los Andes, Bogot\'a, Colombia) | On the realization of Symmetries in Quantum Mechanics | 8 pages | Math Semesterber (2008) 55: 149-160 | 10.1007/s00591-008-0035-5 | null | quant-ph | null | The aim of this paper is to give a simple, geometric proof of Wigner's
theorem on the realization of symmetries in quantum mechanics that clarifies
its relation to projective geometry. Although several proofs exist already, it
seems that the relevance of Wigner's theorem is not fully appreciated in
general. It is Wigner's theorem which allows the use of linear realizations of
symmetries and therefore guarantees that, in the end, quantum theory stays a
linear theory. In the present paper, we take a strictly geometrical point of
view in order to prove this theorem. It becomes apparent that Wigner's theorem
is nothing else but a corollary of the fundamental theorem of projective
geometry. In this sense, the proof presented here is simple, transparent and
therefore accessible even to elementary treatments in quantum mechanics.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:03:06 GMT"
}
] | 2010-06-29T00:00:00 | [
[
"Keller",
"Kai Johannes",
"",
"1 and 2"
],
[
"Papadopoulos",
"Nikolaos A.",
""
],
[
"Reyes-Lega",
"Andrés F.",
""
]
] | [
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] |
712.0998 | Pamela Morehouse | D. Cronin-Hennessy, et al., CLEO Collaboration | A Study of the Decays D^0 --> pi^- e^+ nu_e, D^0 --> K^- e^+ nu_e, D^+
--> pi^0 e^+ nu_e, and D^+ --> barK^0 e^+ nu_e | 9 pages, postscript also available through
http://www.lns.cornell.edu/public/CLNS/2006/, submitted to PRL | Phys.Rev.Lett.100:251802,2008 | 10.1103/PhysRevLett.100.251802 | CLNS 06/1967, CLEO 06-12 | hep-ex | null | Using 1.8 million DDbar pairs and a neutrino reconstruction technique, we
have studied the decays D^0 -> K^- e^+ nu_e, D^0 -> pi^- e^+ nu_e, D^+ ->
Kbar^0 e^+ nu_e, and D^+ -> pi^0 e^+ nu_e. We find B(D^0 -> pi^- e^+ nu_e) =
0.299(11)(9)%, B(D^+ -> pi^0 e^+ nu_e) = 0.373(22)(13)%, B(D^0 -> K^- e^+ nu_e)
= 3.56(3)(9)%, and B(D^+ -> Kbar^0 e^+ nu_e) = 8.53(13)(23)%. In addition, form
factors are studied through fits to the partial branching fractions obtained in
five q^2 ranges. By combining our results with recent unquenched lattice
calculations, we obtain |Vcd| = 0.217(9)(4)(23) and |Vcs| = 1.015(10)(11)(106).
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:35:16 GMT"
}
] | 2010-04-08T00:00:00 | [
[
"Cronin-Hennessy",
"D.",
""
],
[
"Collaboration",
"CLEO",
""
]
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] |
712.0999 | Jeff Greensite | W. Caudy and J. Greensite | On the Ambiguity of Spontaneously Broken Gauge Symmetry | 9 pages, 6 figures. v2: references added | Phys.Rev.D78:025018,2008 | 10.1103/PhysRevD.78.025018 | null | hep-lat hep-th | null | Local gauge symmetries cannot break spontaneously, according to Elitzur's
theorem, but this leaves open the possibility of breaking some global subgroup
of the local gauge symmetry, which is typically the gauge symmetry remaining
after certain (e.g. Coulomb or Landau) gauge choices. We show that in an SU(2)
gauge-Higgs system such symmetries do indeed break spontaneously, but the
location of the breaking in the phase diagram depends on the choice of global
subgroup. The implication is that there is no unique broken gauge symmetry, but
rather many symmetries which break in different places. The problem is to
decide which, if any, of these gauge symmetry breakings is associated with a
transition between physically different, confining and non-confining phases.
Several proposals - Kugo-Ojima, Coulomb, and monopole condensate - are
discussed.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:08:25 GMT"
},
{
"version": "v2",
"created": "Tue, 11 Dec 2007 19:22:45 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Caudy",
"W.",
""
],
[
"Greensite",
"J.",
""
]
] | [
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] |
712.1 | Jie Sun | Jie Sun, Peng Jin, Zhanguo Wang | Research progress of electronic properties of self-assembled
semiconductor quantum dots | A good topic review in Chinese | null | null | null | cond-mat.mes-hall | null | Self-assembled semiconductor quantum dot is a new type of artificially
designed and grown function material which exhibits quantum size effect,
quantum interference effect, surface effect, quantum tunneling-Coulumb-blockade
effect and nonlinear optical effect. Due to advantages like less crystal
defects and relatively simpler fabrication technology, that material may be of
important value in future nanoelectronic device researches. In the order of
vertical transport, lateral transport and charge storage, this paper gives a
brief introduction of recent advances in the electronic properties of that
material and an analysis of problems and perspectives.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:20:59 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Sun",
"Jie",
""
],
[
"Jin",
"Peng",
""
],
[
"Wang",
"Zhanguo",
""
]
] | [
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] |
712.1001 | Pavel A. Ritto Mijangos | P. A. Ritto | Analysis based on the Wavelet & Hilbert transforms applied to the full
time series of interbeats, for a triad of failures at the heart | This document has been withdrawn by the author because it is advanced
in years | null | null | null | physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A tetra of sets which elements are time series of interbeats has been
obtained from the databank Physionet-MIT-BIH, corresponding to the following
failures at the humans' heart: Obstructive Sleep Apnea, Congestive Heart
Failure, and Atrial Fibrillation. Those times series has been analyzed
statistically using an already known technique based on the Wavelet and Hilbert
Transforms. That technique has been applied to the time series of interbeats
for 87 patients, in order to find out the dynamics of the heart. The size of
the times series varies around 7 to 24 h. while the kind of wavelet selected
for this study has been any one of: Daubechies, Biortoghonal, and Gaussian. The
analysis has been done for the complet set of scales ranging from: 1-128
heartbeats. Choosing the Biorthogonal wavelet: bior3.1, it is observed: (a)
That the time series hasn't to be cutted in shorter periods, with the purpose
to obtain the collapsing of the data, (b) An analytical, universal behavior of
the data, for the first and second diseases, but not for the third.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:27:19 GMT"
},
{
"version": "v2",
"created": "Sat, 8 Dec 2007 17:40:37 GMT"
},
{
"version": "v3",
"created": "Tue, 6 Apr 2010 01:22:36 GMT"
},
{
"version": "v4",
"created": "Tue, 8 Feb 2011 23:08:13 GMT"
}
] | 2011-02-10T00:00:00 | [
[
"Ritto",
"P. A.",
""
]
] | [
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712.1002 | Philippe Chomaz | P. Chomaz (GANIL), F. Gulminelli (LPCC) | Phase Transitions in Finite Systems using Information Theory | To be published in AIP Conference Proceedings | Dynamics and Thermodynamics of Systems with Long Range
Interactions: Theory and Experiments, Assisi : Italie (2007) | 10.1063/1.2839119 | GANIL P 07 23 | cond-mat.stat-mech | null | (abridged) In this paper, we present the issues we consider as essential as
far as the statistical mechanics of finite systems is concerned. In particular,
we emphasis our present understanding of phase transitions in the framework of
information theory. Information theory provides a thermodynamically-consistent
treatment of finite, open, transient and expanding systems which are difficult
problems in approaches using standard statistical ensembles. As an example, we
analyze is the problem of boundary conditions, which in the framework of
information theory must also be treated statistically. We recall that out of
the thermodynamical limit the different ensembles are not equivalent and in
particular they may lead to dramatically different equation of states, in the
region of a first order phase transition. We recall the recent progresses
achieved in the understanding of first-order phase transition in finite
systems: the equivalence between the Yang-Lee theorem and the occurrence of
bimodalities in the intensive ensemble and the presence of inverted curvatures
of the thermodynamic potential of the associated extensive ensemble.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:30:27 GMT"
}
] | 2012-02-20T00:00:00 | [
[
"Chomaz",
"P.",
"",
"GANIL"
],
[
"Gulminelli",
"F.",
"",
"LPCC"
]
] | [
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] |
712.1003 | Anna Levina | Anna Levina, J. Michael Herrmann, Theo Geisel | Dynamical synapses causing self-organized criticality in neural networks | 9 pages, 4 figures | A. Levina, J. M. Herrmann, T. Geisel. Dynamical synapses causing
self-organized criticality in neural networks, Nature Phys. 3, 857-860 (2007) | 10.1038/nphys758 | null | cond-mat.stat-mech cond-mat.dis-nn q-bio.NC | null | We show that a network of spiking neurons exhibits robust self-organized
criticality if the synaptic efficacies follow realistic dynamics. Deriving
analytical expressions for the average coupling strengths and inter-spike
intervals, we demonstrate that networks with dynamical synapses exhibit
critical avalanche dynamics for a wide range of interaction parameters. We
prove that in the thermodynamical limit the network becomes critical for all
large enough coupling parameters. We thereby explain experimental observations
in which cortical neurons show avalanche activity with the total intensity of
firing events being distributed as a power-law.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:04:19 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Levina",
"Anna",
""
],
[
"Herrmann",
"J. Michael",
""
],
[
"Geisel",
"Theo",
""
]
] | [
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712.1004 | Nelson Faustino Dr. | Nelson Faustino, Uwe Kaehler | On a correspondence principle between discrete differential forms, graph
structure and multi-vector calculus on symmetric lattices | Research Report | null | null | null | math.CV hep-lat math-ph math.DG math.MP math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on \cite{DH94}, we introduce a bijective correspondence between first
order differential calculi and the graph structure of the symmetric lattice
that allows one to encode completely the interconnection structure of the graph
in the exterior derivative. As a result, we obtain the Grassmannian character
of the lattice as well as the mutual commutativity between basic vector-fields
on the tangent space.
This in turn gives several similarities between the Clifford setting and the
algebra of endomorphisms endowed by the graph structure, such as the hermitian
structure of the lattice as well as the Clifford-like algebra of operators
acting on the lattice. This naturally leads to a discrete version of Clifford
Analysis.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:33:06 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 13:33:43 GMT"
},
{
"version": "v3",
"created": "Wed, 20 Feb 2008 17:48:02 GMT"
},
{
"version": "v4",
"created": "Tue, 17 Jun 2008 17:09:19 GMT"
},
{
"version": "v5",
"created": "Sun, 31 May 2015 20:15:55 GMT"
}
] | 2015-06-02T00:00:00 | [
[
"Faustino",
"Nelson",
""
],
[
"Kaehler",
"Uwe",
""
]
] | [
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712.1005 | Jerome Rodriguez | J. Rodriguez, J. A. Tomsick, S. Chaty | Swift Follow-up Observations of INTEGRAL Sources of Unknown Nature | 7 pages, 2 figures, accepted for publication in A&A. Several changes
since version 1 including referee's comments. Significant modifications in
the case of IGR J18559+1535 | null | 10.1051/0004-6361:20079208 | null | astro-ph | null | (Abridged) We made use of X-ray observations with the X-ray telescope
on-board the \swift observatory to refine the X-ray position to 3-5" accuracy
of 12 INTEGRAL sources, so as to further identify their counterpart at optical,
infrared, and radio wavelengths, to try to unveil their true nature. We then
searched the online catalogues (e.g. NED, SIMBAD, 2MASS, 2MASX, and NVSS) to
search for counterparts at other wavelengths. For all sources, we give a
refined X-ray position, provide X-ray spectral parameters, identify infrared
counterparts, and give magnitudes at optical and ultra violet wavelengths seen
with UVOT when observations are available. We confirm the nature of six sources
formerly suspected to be AGN (IGR J02343+3229, J13149+4422, J14579-4308,
J16385-2057, J18559+1535, J19378-0617). Our analysis first leads us to suggest
that IGR J09523-6231 and IGR J10147-6354 are AGN. While the former has recently
been confirmed as a Seyfert 1.5 AGN, we suggest the latter is a Seyfert 2. All
other sources may be Galactic sources, in which case their spectral shape may
suggest that they are X-ray binaries. In one case (IGR J19308+0530), the
Galactic nature is confirmed through the identification of an F8 star as the
counterpart. We favour a distance to the source not greater than 1 kpc. The
source is likely to be a neutron star XRB or a CV. We also report the discovery
of six serendipitous sources of unknown nature.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:34:51 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 15:01:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Rodriguez",
"J.",
""
],
[
"Tomsick",
"J. A.",
""
],
[
"Chaty",
"S.",
""
]
] | [
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712.1006 | Fabricio Macia | Fabricio Macia | Semiclassical measures and the Schroedinger flow on Riemannian manifolds | 18 pages; Theorems 1,2 extendend to deal with arbitrary time-scales;
references added | Nonlinearity 22 (2009), 1003--1020 | 10.1088/0951-7715/22/5/005 | null | math.AP math-ph math.MP math.SP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study limits of Wigner distributions (the so-called
semiclassical measures) corresponding to sequences of solutions to the
semiclassical Schroedinger equation at times scales $\alpha_{h}$ tending to
infinity as the semiclassical parameter $h$ tends to zero (when $\alpha
_{h}=1/h$ this is equivalent to consider solutions to the non-semiclassical
Schreodinger equation). Some general results are presented, among which a weak
version of Egorov's theorem that holds in this setting. A complete
characterization is given for the Euclidean space and Zoll manifolds (that is,
manifolds with periodic geodesic flow) via averaging formulae relating the
semiclassical measures corresponding to the evolution to those of the initial
states. The case of the flat torus is also addressed; it is shown that
non-classical behavior may occur when energy concentrates on resonant
frequencies. Moreover, we present an example showing that the semiclassical
measures associated to a sequence of states no longer determines those of their
evolutions. Finally, some results concerning the equation with a potential are
presented.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:36:06 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Oct 2008 11:44:19 GMT"
},
{
"version": "v3",
"created": "Mon, 6 Apr 2009 16:40:55 GMT"
}
] | 2009-04-06T00:00:00 | [
[
"Macia",
"Fabricio",
""
]
] | [
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] |
712.1007 | Sourish Basu | Sourish Basu, Erich J. Mueller | Final-state effects in the radio frequency spectrum of strongly
interacting fermions | 4 pages, 4 figures | null | 10.1103/PhysRevLett.101.060405 | null | cond-mat.str-el cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model the impact of final state interactions on the radio frequency
spectrum of a strongly interacting two-component superfluid Fermi gas. In
addition to a broad asymmetric peak coming from the break-up of Cooper pairs we
find that, for appropriate parameters, one can observe a sharp symmetric
"bound-bound" spectral line coming from the conversion of Cooper pairs in one
channels to pairs/molecules in another.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:38:40 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Apr 2008 19:10:16 GMT"
},
{
"version": "v3",
"created": "Thu, 19 Jun 2008 14:51:30 GMT"
},
{
"version": "v4",
"created": "Wed, 9 Jul 2008 23:20:21 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Basu",
"Sourish",
""
],
[
"Mueller",
"Erich J.",
""
]
] | [
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] |
712.1008 | Sergio Boixo | R. Somma, S. Boixo and H. Barnum | Quantum Simulated Annealing | 8 pages, 2 figure | null | null | null | quant-ph | null | We develop a quantum algorithm to solve combinatorial optimization problems
through quantum simulation of a classical annealing process. Our algorithm
combines techniques from quantum walks, quantum phase estimation, and quantum
Zeno effect. It can be viewed as a quantum analogue of the discrete-time Markov
chain Monte Carlo implementation of classical simulated annealing. Our
implementation scales with the inverse of the square root of the minimum
spectral gap of the stochastic matrix used in the classical simulation. The
quantum algorithm outperforms the classical one, which scales with the inverse
of the gap.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 19:46:43 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Somma",
"R.",
""
],
[
"Boixo",
"S.",
""
],
[
"Barnum",
"H.",
""
]
] | [
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] |
712.1009 | Jian-Ge Zhou | Jian-Ge Zhou, Quinton L. Williams and Frank Hagelberg | The CH3SH molecule deposited on Cu(111) and deprotonation | 13 pages, 7 figures, submitted to Phys. Rev. B | null | 10.1103/PhysRevB.77.035402 | null | cond-mat.mtrl-sci | null | We demonstrate for the first time that when a methanethiol adsorbed on the
regular Cu(111) surface, the dissociative structure is thermodynamically more
stable than the intact one. The computational results show that at low
temperature the methanethiol adsorbate prefers the atop site of the regular
Cu(111) surface. As the temperature is increased, the S-H bond is broken and
the methylthiolate favors the hollow sites. On the defected Cu(111) surface,
the dissociative configuration is still thermodynamically more stable than the
nondissociative one. The calculation indicates that the hydrogen initially
attached to the sulfur would like to form a bond with the copper surface rather
than desorb from it. Even though both copper and gold are the noble metal, the
stability of the methanethiol adsorption on the Cu(111) substrate is almost the
reverse of that on the Au(111).
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:30:55 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Zhou",
"Jian-Ge",
""
],
[
"Williams",
"Quinton L.",
""
],
[
"Hagelberg",
"Frank",
""
]
] | [
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] |
712.101 | Peter Horn | Peter Horn | The First-Order Genus of a Knot | 14 pages, 17 figures | null | 10.1017/S0305004108001886 | null | math.GT | null | We introduce a geometric invariant of knots in the three-sphere, called the
first-order genus, that is derived from certain 2-complexes called gropes, and
we show it is computable for many examples. While computing this invariant, we
draw some interesting conclusions about the structure of a general Seifert
surface for some knots.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:40:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Horn",
"Peter",
""
]
] | [
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712.1011 | Christopher D. Carone | Christopher D. Carone and Ashwin Rastogi (William and Mary) | An Exceptional Electroweak Model | 29 pages RevTeX, 7 eps figures. v2: minor revisions | Phys.Rev.D77:035011,2008 | 10.1103/PhysRevD.77.035011 | WM-07-111 | hep-ph | null | We consider a gauge extension of the electroweak sector of the Standard Model
based on the group G_2 x SU(2)x U(1). The exceptional group G_2 is the smallest
rank two group that contains SU(3) as a subgroup; the SU(3) prediction sin^2
theta_w=1/4 follows approximately in this model if the couplings of the
additional SU(2) and U(1) factors are sufficiently large. We study the symmetry
breaking sector of the model, the bounds from precision electroweak constraints
and the mass spectrum of exotic gauge bosons that may be produced at future
colliders. We also discuss an SU(3) electroweak model in which a vector-like
sector is included explicitly to facilitate the decays of otherwise stable
exotic states. The models considered here represent plausible extensions of the
minimal SU(3) electroweak model with potentially distinctive TeV-scale
phenomenology.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 19:36:11 GMT"
},
{
"version": "v2",
"created": "Mon, 25 Feb 2008 22:12:57 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Carone",
"Christopher D.",
"",
"William and Mary"
],
[
"Rastogi",
"Ashwin",
"",
"William and Mary"
]
] | [
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] |
712.1012 | Wojciech Broniowski | Wojciech Broniowski, Enrique Ruiz Arriola, Krzysztof Golec-Biernat | Generalized parton distributions of the pion in chiral quark models and
their QCD evolution | 25 pages, 15 figures, added discussion of the end-point behavior | Phys.Rev.D77:034023,2008 | 10.1103/PhysRevD.77.034023 | null | hep-ph | null | We evaluate Generalized Parton Distributions of the pion in two chiral quark
models: the Spectral Quark Model and the Nambu-Jona-Lasinio model with a
Pauli-Villars regularization. We proceed by the evaluation of double
distributions through the use of a manifestly covariant calculation based on
the alpha representation of propagators. As a result polynomiality is
incorporated automatically and calculations become simple. In addition,
positivity and normalization constraints, sum rules and soft pion theorems are
fulfilled. We obtain explicit formulas, holding at the low-energy quark-model
scale. The expressions exhibit no factorization in the t-dependence. The QCD
evolution of those parton distributions is carried out to experimentally or
lattice accessible scales. We argue for the need of evolution by comparing the
Parton Distribution Function and the Parton Distribution Amplitude of the pion
to the available experimental and lattice data, and confirm that the
quark-model scale is low, about 320 MeV.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:55:20 GMT"
},
{
"version": "v2",
"created": "Thu, 17 Jan 2008 18:06:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Broniowski",
"Wojciech",
""
],
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Golec-Biernat",
"Krzysztof",
""
]
] | [
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] |
712.1013 | Gordon Blower | Gordon Blower | Hankel operators that commute with second-order differential operators | 18 pages | null | 10.1016/j.jmaa.2007.12.028 | null | math.FA | null | Suppose that $\Gamma$ is a continuous and self-adjoint Hankel operator on
$L^2(0, \infty)$ and that $Lf=-(d/dx(a(x)df/dx))+b(x)f(x)$ with $a(0)=0$. If
$a$ and $b$ are both quadratic, hyperbolic or trigonometric functions, and
$\phi$ satisfies a suitable form of Gauss's hypergeometric equation, or the
confluent hypergeometric equation, then $L\Gamma =\Gamma L$. The paper
catalogues the commuting pairs $\Gamma$ and $L$, including important cases in
random matrix theory. There are also results proving rapid decay of the
singular numbers of Hankel integral operators with kernels that are analytic
and of exponential decay in the right half plane.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:51:32 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Blower",
"Gordon",
""
]
] | [
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] |
712.1014 | Vahan Mkrtchyan | A. V. Tserunyan | Characterization Of A Class Of Graphs Related To Pairs Of Disjoint
Matchings | 33 pages, 10 figures | Discrete Mathematics 309 (2009) 693--713 | 10.1016/j.disc.2008.01.004 | null | cs.DM | null | For a given graph consider a pair of disjoint matchings the union of which
contains as many edges as possible. Furthermore, consider the relation of the
cardinalities of a maximum matching and the largest matching in those pairs. It
is known that this relation does not exceed 5/4 for any graph. We characterize
the class of graphs for which this relation is precisely 5/4. Our
characterization implies that these graphs contain a spanning subgraph, every
component of which is the minimal graph of this class.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:30:50 GMT"
}
] | 2009-03-03T00:00:00 | [
[
"Tserunyan",
"A. V.",
""
]
] | [
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] |
712.1015 | Jorge Stephany | D. Mundarain and J. Stephany | Concurrence and negativity as distances | 4 pages | null | null | SB/F/06-355 | quant-ph | null | In this report we consider the three dimensional subset of the space of
states of two qubits that may be written in the so called standard form. For
those states we show that different measures of entanglement, specifically
concurrence, negativity and the Hilbert-Schmidt distance are proportional to
the euclidean distance between the point representing the state in the three
dimensional parameter space and the set of separable states.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 17:56:12 GMT"
},
{
"version": "v2",
"created": "Thu, 6 Dec 2007 22:46:07 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Mundarain",
"D.",
""
],
[
"Stephany",
"J.",
""
]
] | [
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] |
712.1016 | Thomas Binoth Dr. | A. D. Kennedy, T. Binoth, T. Rippon | Automating Renormalization of Quantum Field Theories | Invited talk given by A.D. Kennedy at the International Workshop on
Symbolic-Numeric Computation'07, University of Western Ontario, Canada | Proceedings of the 2007 international workshop on Symbolic-numeric
computation, London, Ontario, Canada, 18-27 (2007). ISBN:978-1-59593-744-5 | null | Edinburgh 2007/46 | hep-ph | null | We give an overview of state-of-the-art multi-loop Feynman diagram
computations, and explain how we use symbolic manipulation to generate
renormalized integrals that are then evaluated numerically. We explain how we
automate BPHZ renormalization using "henges" and "sectors", and give a brief
description of the symbolic tensor and Dirac gamma-matrix manipulation that is
required. We shall compare the use of general computer algebra systems such as
Maple with domain-specific languages such as
FORM, highlighting in particular memory management issues.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 19:33:28 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Kennedy",
"A. D.",
""
],
[
"Binoth",
"T.",
""
],
[
"Rippon",
"T.",
""
]
] | [
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] |
712.1017 | Udai Raj Singh | Udai Raj Singh, S. Chaudhuri, Shyam K. Choudhary, R. C. Budhani, and
Anjan K. Gupta | Tunneling Study of the Charge-Ordering Gap on the Surface of
La$_{0.350}$Pr$_{0.275}$Ca$_{0.375}$MnO$_3$ Thin Films | 5 pages, 5 figures To appear in Phys. Rev. B | null | 10.1103/PhysRevB.77.014404 | null | cond-mat.str-el | null | Variable temperature scanning tunneling microscopy/spectroscopy studies on
(110) oriented epitaxial thin films of
La$_{0.350}$Pr$_{0.275}$Ca$_{0.375}$MnO$_3$ are reported in the temperature
range of 77 to 340 K. The films, grown on lattice matched NdGaO$_3$ substrates,
show a hysteretic metal-insulator transition in resistivity at 170 K. The
topographic STM images show step-terrace morphology while the conductance
images display a nearly homogeneous surface. The normalized conductance spectra
at low temperatures (T$<$150 K) show an energy gap of 0.5 eV while for
T$\geq$180 K a gap of 0.16 eV is found from the activated behavior of the zero
bias conductance. The presence of energy gap and the absence of phase
separation on the surface over more than 2 $\mu$m$\times$2 $\mu$m area
contradicts the metallic behavior seen in resistivity measurements at low
temperatures. We discuss the measured energy gap in terms of the stabilization
of the insulating CO phase at the film surface.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:03:03 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Singh",
"Udai Raj",
""
],
[
"Chaudhuri",
"S.",
""
],
[
"Choudhary",
"Shyam K.",
""
],
[
"Budhani",
"R. C.",
""
],
[
"Gupta",
"Anjan K.",
""
]
] | [
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712.1018 | W. A. Zuniga-Galindo | J. J. Rodriguez-Vega and W. A. Zuniga-Galindo | Taibleson Operators, p-adic Parabolic Equations and Ultrametric
Diffusion | A paragraph was added to introduction. Several typos were corrected | null | null | null | math-ph math.MP | null | We give a multimensional version of the p-adic heat equation, and show that
its fundamental solution is the transition density of a Markov process.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:06:18 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Jan 2008 03:37:31 GMT"
}
] | 2008-01-16T00:00:00 | [
[
"Rodriguez-Vega",
"J. J.",
""
],
[
"Zuniga-Galindo",
"W. A.",
""
]
] | [
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712.1019 | Nadine Nettelmann | N. Nettelmann, B. Holst, A. Kietzmann, M. French, R. Redmer, and D.
Blaschke | Ab initio Equation of State data for hydrogen, helium, and water and the
internal structure of Jupiter | to appear in ApJ in August 2008, 11 figures | Astrophys.J.683:1217-1228,2008 | 10.1086/589806 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of state of hydrogen, helium, and water effects interior
structure models of giant planets significantly. We present a new equation of
state data table, LM-REOS, generated by large scale quantum molecular dynamics
simulations for hydrogen, helium, and water in the warm dense matter regime,
i.e.for megabar pressures and temperatures of several thousand Kelvin, and by
advanced chemical methods in the complementary regions. The influence of
LM-REOS on the structure of Jupiter is investigated and compared with
state-of-the-art results within a standard three-layer model consistent with
astrophysical observations of Jupiter. Our new Jupiter models predict an
important impact of mixing effects of helium in hydrogen with respect to an
altered compressibility and immiscibility.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:12:24 GMT"
},
{
"version": "v2",
"created": "Fri, 6 Jun 2008 15:12:59 GMT"
}
] | 2008-11-07T00:00:00 | [
[
"Nettelmann",
"N.",
""
],
[
"Holst",
"B.",
""
],
[
"Kietzmann",
"A.",
""
],
[
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"M.",
""
],
[
"Redmer",
"R.",
""
],
[
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"D.",
""
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] |
712.102 | Pamela Morehouse | CLEO Collaboration: S. Dobbs, et al | A Study of the Semileptonic Charm Decays D^0 --> pi^- e^+ nu_e, D^+ -->
pi^0 e^+ nu_e, D^0 --> K^- e^+ nu_e, and D^+ --> barK^0 e^+ nu_e | 18 pages, postscript also available through
http://www.lns.cornell.edu/public/CLNS/2006/, submitted to PRD | Phys.Rev.D77:112005,2008 | 10.1103/PhysRevD.77.112005 | CLNS 06/1968, CLEO 06-13 | hep-ex | null | Using a sample of 1.8 million DDbar meson pairs collected at the psi(3770)
with the CLEO-c detector, we study the semileptonic decays D^0 -> pi^- e^+
nu_e, D^+ -> pi^0 e^+ \nu_e, D^0 -> K^- e^+ \nu_e, and D^+ -> Kbar^0 e^+ nu_e.
For the total branching fractions we find B(D^0 -> pi^- e^+ \nu_e) =
0.299(11)(9)%, B(D^+ -> pi^0 e^+ \nu_e) = 0.373(22)(13)%, B(D^0 -> K^- e^+
nu_e) = 3.56(3)(9)%, and B(D^+ -> Kbar^0 e^+ nu_e) = 8.53(13)(23)%, where the
first error is statistical and the second systematic. In addition, form factors
are studied through fits to the partial branching fractions obtained in five
q^2 ranges. By combining our results with recent unquenched lattice
calculations, we obtain |Vcd| = 0.217(9)(4)(23) and |Vcs| = 1.015(10)(11)(106),
where the final error is theoretical.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:19:21 GMT"
}
] | 2010-04-08T00:00:00 | [
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"",
""
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"S.",
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712.1021 | Gerardo Aldazabal | Gerardo Aldazabal, Anamaria Font | A second look at N=1 supersymmetric AdS_4 vacua of type IIA supergravity | Latex file, 35 pages, no figures. Reference added, minor corrections
added | JHEP0802:086,2008 | 10.1088/1126-6708/2008/02/086 | IFT-UAM/CSIC-07-58 | hep-th | null | We show that a class of type IIA vacua recently found within the N=4
effective approach corresponds to compactification on Ads_4 \times S^3 \times
S^3/Z_2^3. The results obtained using the effective method completely match the
general ten-dimensional analysis for the existence of N=1 warped
compactifications on Ads_4 \times M_6. In particular, we verify that the
internal metric is nearly-Kahler and that for specific values of the parameters
the Bianchi identity of the RR 2-form is fulfilled without sources. For another
range of parameters, including the massless case, the Bianchi identity is
satisfied when D6-branes are introduced. Solving the tadpole cancellation
conditions in D=4 we are able to find examples of appropriate sets of branes.
In the second part of this paper we describe how an example with internal space
CP^3 but with non nearly-Kahler metric fits into the general analysis of flux
vacua.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:20:23 GMT"
},
{
"version": "v2",
"created": "Mon, 17 Dec 2007 15:19:48 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aldazabal",
"Gerardo",
""
],
[
"Font",
"Anamaria",
""
]
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712.1022 | Ahmed Ali | Ahmed Ali | Theoretical Interest in B-Meson Physics at the B factories, Tevatron and
the LHC | 43 pages, 1 figure, requires style files cite.sty, ws-procs9X6.cls;
invited talk at the International Symposium on Contemporary Physics, NCP,
Islamabad, Pakistan (March 26-30, 2007). To appear in the proceedings | null | 10.1142/9789812818942_0012 | DESY 07-212 | hep-ph hep-ex hep-lat | null | We review the salient features of $B$-meson physics, with particular emphasis
on the measurements carried out at the $B$-factories and Tevatron, theoretical
progress in understanding these measurements in the context of the standard
model, and anticipation at the LHC. Topics discussed specifically are the
current status of the Cabibbo-Kobayashi-Maskawa matrix, the CP-violating
phases, rare radiative and semileptonic decays, and some selected non-leptonic
two-body decays of the $B$ mesons.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:26:54 GMT"
}
] | 2017-08-23T00:00:00 | [
[
"Ali",
"Ahmed",
""
]
] | [
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] |
712.1023 | Robert Singleton Jr. Dr. | Robert L. Singleton Jr | Charged Particle Stopping Power Effects on Ignition: Some Results from
an Exact Calculation | 19 pages, 3 Figures, Published in the proceedings for the 49th Annual
meeting of the APS Division of Plasma Physics, Orlando FL, 12-16 November
2007. Added more details about numerics | Physics of Plasmas 15 (2008) 056302 | 10.1063/1.2840134 | LA-UR-07-7021 | physics.plasm-ph | null | A completely rigorous first-principles calculation of the charged particle
stopping power has recently been performed by Brown, Preston, and Singleton
(BPS). This calculation is exact to leading and next-to-leading order in the
plasma number density, including an exact treatment of two-body quantum
scattering. The BPS calculation is therefore extremely accurate in the plasma
regime realized during the ignition and burn of an inertial confinement fusion
capsule. For deuterium-tritium fusion, the 3.5 MeV alpha particle range tends
to be 20-30% longer than most models in the literature have predicted, and the
energy deposition into the ions tends to be smaller. Preliminary numerical
simulations indicate that this increases the rho-R required to achieve
ignition.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:28:31 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Feb 2008 19:05:34 GMT"
}
] | 2008-02-21T00:00:00 | [
[
"Singleton",
"Robert L.",
"Jr"
]
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] |
712.1024 | Duccio Fanelli | Timoteo Carletti, Duccio Fanelli, Alessio Guarino, Franco Bagnoli and
Andrea Guazzini | Opinion Dynamics in an Open Community | null | null | null | null | physics.soc-ph | null | We here discuss the process of opinion formation in an open community where
agents are made to interact and consequently update their beliefs. New actors
(birth) are assumed to replace individuals that abandon the community (deaths).
This dynamics is simulated in the framework of a simplified model that accounts
for mutual affinity between agents. A rich phenomenology is presented and
discussed with reference to the original (closed group) setting. Numerical
findings are supported by analytical calculations.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 18:33:39 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Carletti",
"Timoteo",
""
],
[
"Fanelli",
"Duccio",
""
],
[
"Guarino",
"Alessio",
""
],
[
"Bagnoli",
"Franco",
""
],
[
"Guazzini",
"Andrea",
""
]
] | [
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] |
712.1025 | Sergey Kozyrev | S.M.Kozyrev | Some questions to experimental gravity | 9 pages | null | null | null | gr-qc | null | The interpretations of solutions of Einstein field's equations led to the
prediction and the observation of physical phenomena which confirm the
important role of general relativity, as well as other relativistic theories in
physics. In this connection, the following questions are of interest and
importance: whether it is possible to solve the gauge problem and of its
physical significance, which one of the solutions gives the right description
of the observed values, how to clarify the physical meaning of the coordinates
which is unknown a priori, and why applying the same physical requirements in
different gauge fixing, we obtain different linear approximations. We discuss
some of the problems involved and point out several open problems. The paper is
written mainly for pedagogical purposes.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 19:06:08 GMT"
}
] | 2007-12-07T00:00:00 | [
[
"Kozyrev",
"S. M.",
""
]
] | [
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] |
712.1026 | Gianguido Dall'Agata | Gianguido Dall'Agata, Nikolaos Prezas, Henning Samtleben and Mario
Trigiante | Gauged Supergravities from Twisted Doubled Tori and Non-Geometric String
Backgrounds | 36 pages, 1 figure. v2: minor changes; v3: version to appear in NPB | Nucl.Phys.B799:80-109,2008 | 10.1016/j.nuclphysb.2008.02.020 | DFPD-07TH18, CERN-PH-TH/2007-248, ENSL-00196727 | hep-th | null | We propose a universal geometric formulation of gauged supergravity in terms
of a twisted doubled torus. We focus on string theory (M-theory) reductions
with generalized Scherk-Schwarz twists residing in the O(n,n) (E_{7(7)})
duality group. The set of doubled geometric fluxes, associated with the duality
twists and identified naturally with the embedding tensor of gauged
supergravity, captures all known fluxes, i.e. physical form fluxes, ordinary
geometric fluxes, as well as their non-geometric counterparts. Furthermore, we
propose a prescription for obtaining the effective geometry embedded in the
string theory twisted doubled torus or in the M-theory megatorus and apply it
for several models of geometric and non-geometric flux compactifications.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 19:43:42 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Dec 2007 18:14:28 GMT"
},
{
"version": "v3",
"created": "Tue, 8 Apr 2008 10:33:51 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Dall'Agata",
"Gianguido",
""
],
[
"Prezas",
"Nikolaos",
""
],
[
"Samtleben",
"Henning",
""
],
[
"Trigiante",
"Mario",
""
]
] | [
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] |
712.1027 | Mu Zhu | Mu Zhu | Kernels and Ensembles: Perspectives on Statistical Learning | 22 pages; 6 figures; sumitted to The American Statistician | The American Statistician, May 2008, Vol. 62, No. 2, Pages 97 -
109. | 10.1198/000313008X306367 | null | stat.ME stat.ML | null | Since their emergence in the 1990's, the support vector machine and the
AdaBoost algorithm have spawned a wave of research in statistical machine
learning. Much of this new research falls into one of two broad categories:
kernel methods and ensemble methods. In this expository article, I discuss the
main ideas behind these two types of methods, namely how to transform linear
algorithms into nonlinear ones by using kernel functions, and how to make
predictions with an ensemble or a collection of models rather than a single
model. I also share my personal perspectives on how these ideas have influenced
and shaped my own research. In particular, I present two recent algorithms that
I have invented with my collaborators: LAGO, a fast kernel algorithm for
unbalanced classification and rare target detection; and Darwinian evolution in
parallel universes, an ensemble method for variable selection.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:31:29 GMT"
}
] | 2008-04-15T00:00:00 | [
[
"Zhu",
"Mu",
""
]
] | [
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712.1028 | Nicolas Yunes | Nicolas Yunes, Carlos F. Sopuerta | Perturbations of Schwarzschild Black Holes in Chern-Simons Modified
Gravity | 14 pages, submitted to PRD | Phys.Rev.D77:064007,2008 | 10.1103/PhysRevD.77.064007 | IGC-07/12-3 | gr-qc astro-ph hep-th | null | We study perturbations of a Schwarzschild black hole in Chern-Simons modified
gravity. We begin by showing that Birkhoff's theorem holds for a wide family of
Chern-Simons coupling functions, a scalar field present in the theory that
controls the strength of the Chern-Simons correction to the Einstein-Hilbert
action. After decomposing the perturbations in spherical harmonics, we study
the linearized modified field equations and find that axial and polar modes are
coupled, in contrast to general relativity. The divergence of the modified
equations leads to the Pontryagin constraint, which forces the vanishing of the
Cunningham-Price-Moncrief master function associated with axial modes. We
analyze the structure of these equations and find that the appearance of the
Pontryagin constraint yields an overconstrained system that does not allow for
generic black hole oscillations. We illustrate this situation by studying the
case characterized by a canonical choice of the coupling function and
pure-parity perturbative modes. We end with a discussion of how to extend
Chern-Simons modified gravity to bypass the Pontryagin constraint and the
suppression of perturbations.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 19:57:31 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Yunes",
"Nicolas",
""
],
[
"Sopuerta",
"Carlos F.",
""
]
] | [
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] |
712.1029 | Marcelino Agundez | M. Agundez, J. P. Fonfria, J. Cernicharo, J. R., Pardo and M. Guelin | Detection of circumstellar CH2CHCN, CH2CN, CH3CCH and H2CS | 9 pages, 5 figures; accepted for publication in A&A | null | 10.1051/0004-6361:20078956 | null | astro-ph | null | We report on the detection of vinyl cyanide (CH2CHCN), cyanomethyl radical
(CH2CN), methylacetylene (CH3CCH) and thioformaldehyde (H2CS) in the C-rich
star IRC +10216. These species, which are all known to exist in dark clouds,
are detected for the first time in the circumstellar envelope around an AGB
star. The four molecules have been detected trough pure rotational transitions
in the course of a 3 mm line survey carried out with the IRAM 30-m telescope.
The molecular column densities are derived by constructing rotational
temperature diagrams. A detailed chemical model of the circumstellar envelope
is used to analyze the formation of these molecular species. We have found
column densities in the range 5 x 10^(12)- 2 x 10^(13) cm^(-2), which
translates to abundances relative to H2 of several 10^(-9). The chemical model
is reasonably successful in explaining the derived abundances through gas phase
synthesis in the cold outer envelope. We also find that some of these
molecules, CH2CHCN and CH2CN, are most probably excited trough infrared pumping
to excited vibrational states. The detection of these species stresses the
similarity between the molecular content of cold dark clouds and C-rich
circumstellar envelopes. However, some differences in the chemistry are
indicated by the fact that in IRC +10216 partially saturated carbon chains are
present at a lower level than those which are highly unsaturated, while in
TMC-1 both types of species have comparable abundances.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:07:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Agundez",
"M.",
""
],
[
"Fonfria",
"J. P.",
""
],
[
"Cernicharo",
"J.",
""
],
[
"R.",
"J.",
""
],
[
"Pardo",
"",
""
],
[
"Guelin",
"M.",
""
]
] | [
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] |
712.103 | Richard Umstaetter | R. Umstaetter, M. Tinto | Bayesian comparison of Post-Newtonian approximations of gravitational
wave chirp signals | 37 pages, 9 figures | Phys.Rev.D77:082002,2008 | 10.1103/PhysRevD.77.082002 | null | gr-qc | null | We estimate the probability of detecting a gravitational wave signal from
coalescing compact binaries in simulated data from a ground-based
interferometer detector of gravitational radiation using Bayesian model
selection. The simulated waveform of the chirp signal is assumed to be a
spin-less Post-Newtonian (PN) waveform of a given expansion order, while the
searching template is assumed to be either of the same Post-Newtonian family as
the simulated signal or one level below its Post-Newtonian expansion order.
Within the Bayesian framework, and by applying a reversible jump Markov chain
Monte Carlo simulation algorithm, we compare PN1.5 vs. PN2.0 and PN3.0 vs.
PN3.5 wave forms by deriving the detection probabilities, the statistical
uncertainties due to noise as a function of the SNR, and the posterior
distributions of the parameters. Our analysis indicates that the detection
probabilities are not compromised when simplified models are used for the
comparison, while the accuracies in the determination of the parameters
characterizing these signals can be significantly worsened, no matter what the
considered Post-Newtonian order expansion comparison is.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:10:47 GMT"
},
{
"version": "v2",
"created": "Fri, 7 Dec 2007 19:55:20 GMT"
},
{
"version": "v3",
"created": "Tue, 11 Dec 2007 19:00:53 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Umstaetter",
"R.",
""
],
[
"Tinto",
"M.",
""
]
] | [
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712.1031 | Ariel Megevand | Ariel Megevand and Alejandro D. Sanchez | Supercooling and phase coexistence in cosmological phase transitions | 25 pages, 10 figures. References added and minor corrections. Version
to appear in Phys. Rev. D | Phys.Rev.D77:063519,2008 | 10.1103/PhysRevD.77.063519 | null | hep-ph astro-ph hep-th | null | Cosmological phase transitions are predicted by Particle Physics models, and
have a variety of important cosmological consequences, which depend strongly on
the dynamics of the transition. In this work we investigate in detail the
general features of the development of a first-order phase transition. We find
thermodynamical constraints on some quantities that determine the dynamics,
namely, the latent heat, the radiation energy density and the false-vacuum
energy density. Using a simple model with a Higgs field, we study numerically
the amount and duration of supercooling and the subsequent reheating and phase
coexistence. We analyze the dependence of the dynamics on the different
parameters of the model, namely, the energy scale, the number of degrees of
freedom and the couplings of the scalar field with bosons and fermions. We also
inspect the implications for the cosmological outcomes of the phase transition.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:26:00 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Dec 2007 20:35:51 GMT"
},
{
"version": "v3",
"created": "Tue, 19 Feb 2008 18:08:03 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Megevand",
"Ariel",
""
],
[
"Sanchez",
"Alejandro D.",
""
]
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] |
712.1032 | Jack Morava | Jack Morava | Moonshine elements in elliptic cohomology | Talk at the Spring 07 Montreal conference on groups and symmetries,
in honor of John McKay | Groups and symmetries, 247 - 257, CRM Proc. Lecture Notes, 47,
Amer. Math. Soc., Providence, RI, 2009 | null | null | math.AT math.RT | null | This is a historical talk about the recent confluence of two lines of
research in equivariant elliptic cohomology, one concerned with connected Lie
groups, the other with the finite case. These themes come together in (what
seems to me remarkable) work of N. Ganter, relating replicability of
McKay-Thompson series to the theory of exponential cohomology operations.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:26:40 GMT"
}
] | 2011-06-28T00:00:00 | [
[
"Morava",
"Jack",
""
]
] | [
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] |
712.1033 | Charles R. Cowley | C. R. Cowley, S. Hubrig | HR 710 (HD 15144): An ultra-Sr-rich, magnetic Ap star with a close
companion | 10 pages, 14 figures; accepted for publication MNRAS; v2: metadata
authors corrected | null | 10.1111/j.1365-2966.2007.12827.x | null | astro-ph | null | The magnetic, chemically peculiar A-star HR 710 (HD 15144, ADS 1849A, AB Cet)
has a close companion in a nearly circular orbit. Its 3-day period is unusually
short for such stars. The system emits moderately hard x-rays, which likely
come from a white dwarf secondary (ADS 1849Ab). The Sr II spectrum is very
strong, and the resonance lines show similar core-nib structure to the stronger
Ca K line. We place only loose constraints on a model. There are indications of
a lower electron/gas pressure than expected from the star's parallax and
brightness. Strong-line profiles and anomalous excitation/ionization indicate
significant deviations from traditional models, fixed by Teff, log{g}, and
abundances. Weak spectral-line profiles and wavelength shifts probably indicate
abundance patches rather than the presence of a secondary (ADS 1849Ab)
spectrum. Our UVES spectra are from only one epoch. Additional low-noise,
high-resolution spectra are needed. We discuss the spectrum within the context
of abundance stratification.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:27:53 GMT"
},
{
"version": "v2",
"created": "Thu, 20 Dec 2007 22:13:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cowley",
"C. R.",
""
],
[
"Hubrig",
"S.",
""
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712.1034 | Mar?a Catalina Espinoza Hern?ndez | Jos\'e Bernab\'eu and Catalina Espinoza | Energy Dependence of CP-Violation Reach for Monochromatic Neutrino Beam | 11 pages, 7 figures | Phys.Lett.B664:285-290,2008 | 10.1016/j.physletb.2008.05.033 | null | hep-ph | null | The ultimate goal for future neutrino facilities is the determination of CP
violation in neutrino oscillations. Besides $| U(e3) | \ne 0$, this will
require precision experiments with a very intense neutrino source and energy
control. With this objective in mind, the creation of monochromatic neutrino
beams from the electron capture decay of boosted ions by the SPS of CERN has
been proposed. We discuss the capabilities of such a facility as a function of
the energy of the boost and the baseline for the detector. We compare the
physics potential for two different configurations: I) $\gamma=90$ and
$\gamma=195$ (maximum achievable at present SPS) to Frejus; II) $\gamma=195$
and $\gamma=440$ (maximum achievable at upgraded SPS) to Canfranc. We conclude
that the SPS upgrade to 1000 GeV is important to reach a better sensitivity to
CP violation iff it is accompanied by a longer baseline. In both Setups, the
gain in the CP violation sensitivity with a previous knowledge of $| U(e3) |$
is apparent.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:50:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bernabéu",
"José",
""
],
[
"Espinoza",
"Catalina",
""
]
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712.1035 | Lincoln D. Carr | Mark T. Lusk and L. D. Carr | Nano-Engineering Defect Structures on Graphene | 4 pages, 5 figures | Phys. Rev. Lett. v. 100, p. 175503 (2008) | 10.1103/PhysRevLett.100.175503 | null | cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new way of nano-engineering graphene using defect domains. These
regions have ring structures that depart from the usual honeycomb lattice,
though each carbon atom still has three nearest neighbors. A set of stable
domain structures is identified using density functional theory (DFT),
including blisters, ridges, ribbons, and metacrystals. All such structures are
made solely out of carbon; the smallest encompasses just 16 atoms. Blisters,
ridges and metacrystals rise up out of the sheet, while ribbons remain flat. In
the vicinity of vacancies, the reaction barriers to formation are sufficiently
low that such defects could be synthesized through the thermally activated
restructuring of coalesced adatoms.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 20:59:57 GMT"
},
{
"version": "v2",
"created": "Tue, 23 Sep 2008 23:21:03 GMT"
}
] | 2010-06-01T00:00:00 | [
[
"Lusk",
"Mark T.",
""
],
[
"Carr",
"L. D.",
""
]
] | [
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] |
712.1036 | Krzysztof Belczynski | K. Belczynski, R. O'Shaughnessy, V. Kalogera, F. Rasio, R. Taam, T.
Bulik | The lowest-mass stellar black holes: catastrophic death of neutron stars
in gamma-ray bursts | 3 pages of text + 4 figures: ApJ accepted (some revisions) | null | 10.1086/589970 | LA-UR-07-7964 | astro-ph | null | Mergers of double neutron stars are considered the most likely progenitors
for short gamma-ray bursts. Indeed such a merger can produce a black hole with
a transient accreting torus of nuclear matter (Lee & Ramirez-Ruiz 2007,
Oechslin & Janka 2006), and the conversion of a fraction of the torus
mass-energy to radiation can power a gamma-ray burst (Nakar 2006). Using
available binary pulsar observations supported by our extensive evolutionary
calculations of double neutron star formation, we demonstrate that the fraction
of mergers that can form a black hole -- torus system depends very sensitively
on the (largely unknown) maximum neutron star mass. We show that the available
observations and models put a very stringent constraint on this maximum mass
under the assumption that a black hole formation is required to produce a short
gamma-ray burst in a double neutron star merger. Specifically, we find that the
maximum neutron star mass must be within 2 - 2.5 Msun. Moreover, a single
unambiguous measurement of a neutron star mass above 2.5 Msun would exclude a
black hole -- torus central engine model of short gamma-ray bursts in double
neutron star mergers. Such an observation would also indicate that if in fact
short gamma-ray bursts are connected to neutron star mergers, the gamma-ray
burst engine is best explained by the lesser known model invoking a highly
magnetized massive neutron star (e.g., Usov 1992; Kluzniak & Ruderman 1998; Dai
et al. 2006; Metzger, Quataert & Thompson 2007).
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:21:18 GMT"
},
{
"version": "v2",
"created": "Wed, 16 Apr 2008 20:50:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Belczynski",
"K.",
""
],
[
"O'Shaughnessy",
"R.",
""
],
[
"Kalogera",
"V.",
""
],
[
"Rasio",
"F.",
""
],
[
"Taam",
"R.",
""
],
[
"Bulik",
"T.",
""
]
] | [
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] |
712.1037 | J\"org P. Dietrich | J. P. Dietrich | The Importance of Being First: Position Dependent Citation Rates on
arXiv:astro-ph | accepted for publication in PASP | null | 10.1086/527522 | null | astro-ph cs.DL | null | We study the dependence of citation counts of e-prints published on the
arXiv:astro-ph server on their position in the daily astro-ph listing. Using
the SPIRES literature database we reconstruct the astro-ph listings from July
2002 to December 2005 and determine citation counts for e-prints from their ADS
entry. We use Zipf plots to analyze the citation distributions for each
astro-ph position. We find that e-prints appearing at or near the top of the
astro-ph mailings receive significantly more citations than those further down
the list. This difference is significant at the 7 sigma level and on average
amounts to two times more citations for papers at the top than those further
down the listing. We propose three possible non-exclusive explanations for this
positional citation effect and try to test them. We conclude that
self-promotion by authors plays a role in the observed effect but cannot
exclude that increased visibility at the top of the daily listings contributes
to higher citation counts as well. We can rule out that the positional
dependence of citations is caused by the coincidence of the submission deadline
with the working hours of a geographically constrained set of intrinsically
higher cited authors. We discuss several ways of mitigating the observed
effect, including splitting astro-ph into several subject classes, randomizing
the order of e-prints, and a novel approach to sorting entries by relevance to
individual readers.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:00:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dietrich",
"J. P.",
""
]
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] |
712.1038 | Gregory Dobler | Gregory Dobler, Douglas P. Finkbeiner (Harvard/CfA) | Extended Anomalous Foreground Emission in the WMAP 3-Year Data | 14 pages, 10 figures; submitted to ApJ | Astrophys.J.680:1222-1234,2008 | 10.1086/587862 | null | astro-ph | null | We study the spectral and morphological characteristics of the diffuse
Galactic emission in the WMAP temperature data using a template-based
multi-linear regression, and obtain the following results. 1. We confirm
previous observations of a bump in the dust-correlated spectrum, consistent
with the Draine & Lazarian spinning dust model. 2. We also confirm the "haze"
signal in the inner Galaxy, and argue that it does not follow a free-free
spectrum as first thought, but instead is synchrotron emission from a hard
electron cosmic-ray population. 3. In a departure from previous work, we allow
the spectrum of Halpha-correlated emission (which is used to trace the
free-free component) to float in the fit, and find that it does not follow the
expected free-free spectrum. Instead there is a bump near 50 GHz, modifying the
spectrum at the 20% level, which we speculate is caused by spinning dust in the
warm ionized medium. 4. The derived cross-correlation spectra are not sensitive
to the map zero points, but are sensitive to the choice of CMB estimator. In
cases where the CMB estimator is derived by minimizing variance of a linear
combination of the WMAP bands, we show that a bias proportional to the
cross-correlation of each template and the true CMB is always present. This
bias can be larger than any of the foreground signals in some bands. 5. Lastly,
we consider the frequency coverage and sensitivity of the Planck mission, and
suggest linear combination coefficients for the CMB template that will reduce
both the statistical and systematic uncertainty in the synchrotron and haze
spectra by more than an order of magnitude.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:00:16 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Dobler",
"Gregory",
"",
"Harvard/CfA"
],
[
"Finkbeiner",
"Douglas P.",
"",
"Harvard/CfA"
]
] | [
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712.1039 | Jonathan Handy | Jon Handy | The Corona Theorem on the Complements of Certain Square Cantor Sets | 16 pages, 3 figures. (submitted: Journal d'Analyse Mathematique) | null | null | null | math.CV | null | Let $K$ be a square Cantor set, i.e. the Cartesian product $K=E\times E$ of
two linear Cantor sets. Let $\delta_n$ denote the proportion of the intervals
removed in the $n$th stage of the construction of $E$. It is shown that if
$\delta_n=o(\frac1{\log\log n})$ then the corona theorem holds on the domain
$\Omega=\mathbb C^\ast\setminus K$.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:00:52 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Handy",
"Jon",
""
]
] | [
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712.104 | Rosalba Perna | Rosalba Perna (1), Roberto Soria (2), Dave Pooley (3), Luigi Stella
(4) ((1) CU-Boulder/JILA; (2) MSSL; (3) U. of Wisconsin-Madison; (4)
INAF-OAR) | How rapidly do neutron stars spin at birth? Constraints from archival
X-ray observations of extragalactic supernovae | 12 pages, 2 figures, accepted for publication in MNRAS | null | 10.1111/j.1365-2966.2007.12821.x | null | astro-ph | null | Traditionally, studies aimed at inferring the distribution of birth periods
of neutron stars are based on radio surveys. Here we propose an independent
method to constrain the pulsar spin periods at birth based on their X-ray
luminosities. In particular, the observed luminosity distribution of supernovae
poses a constraint on the initial rotational energy of the embedded pulsars,
via the L_X-dot{E}_{rot} correlation found for radio pulsars, and under the
assumption that this relation continues to hold beyond the observed range. We
have extracted X-ray luminosities (or limits) for a large sample of historical
SNe observed with Chandra, XMM and Swift, that have been firmly classified as
core-collapse supernovae. We have then compared these observational limits with
the results of Monte Carlo simulations of the pulsar X-ray luminosity
distribution, for a range of values of the birth parameters. We find that a
pulsar population dominated by millisecond periods at birth is ruled out by the
data.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:03:07 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Perna",
"Rosalba",
""
],
[
"Soria",
"Roberto",
""
],
[
"Pooley",
"Dave",
""
],
[
"Stella",
"Luigi",
""
]
] | [
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] |
712.1041 | Ezequiel Treister | C. Megan Urry (Yale), E. Treister (ESO, Chile) | Supermassive Black Holes in Deep Multiwavelength Surveys | To appear in proceedings of "2007 STScI spring symposium: Black
Holes", eds. M. Livio & A. M. Koekemoer, Cambridge University Press,
submitted. 22 pages, 12 figures | null | null | null | astro-ph | null | In recent years deep X-ray and infrared surveys have provided an efficient
way to find accreting supermassive black holes, otherwise known as active
galactic nuclei (AGN), in the young universe. Such surveys can, unlike optical
surveys, find AGN obscured by high column densities of gas and dust. In those
cases, deep optical data show only the host galaxy, which can then be studied
in greater detail than in unobscured AGN. Some years ago the hard spectrum of
the X-ray "background" suggested that most AGN were obscured. Now GOODS, MUSYC,
COSMOS and other surveys have confirmed this picture and given important
quantitative constraints on AGN demographics. Specifically, we show that most
AGN are obscured at all redshifts and the amount of obscuration depends on both
luminosity and redshift, at least out to redshift z~2, the epoch of substantial
black holes and galaxy growth. Larger-area deep infrared and hard X-ray surveys
will be needed to reach higher redshifts and to probe fully the co-evolution of
galaxies and black holes.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:03:58 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Urry",
"C. Megan",
"",
"Yale"
],
[
"Treister",
"E.",
"",
"ESO, Chile"
]
] | [
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712.1042 | Sen Zhou | Sen Zhou and Ziqiang Wang | Nodal $d+id$ pairing and topological phases on the triangular lattice:
unconventional superconducting state of Na$_x$CoO$_2\cdot y$H$_2$O | revtex4 file, 4 pages and 3 figures; to appear on Phys. Rev. Lett | Phys. Rev. Lett. 100, 217002 (2008) | 10.1103/PhysRevLett.100.217002 | null | cond-mat.str-el cond-mat.supr-con | null | We show that finite angular momentum pairing chiral superconductors on the
triangular lattice have point zeroes in the complex gap function. A topological
quantum phase transition takes place through a nodal superconducting state at a
specific carrier density $x_c$ where the normal state Fermi surface crosses the
isolated zeros. For spin singlet pairing, we show that the second nearest
neighbor $d+id$-wave pairing can be the dominant pairing channel. The gapless
critical state at $x_c\simeq0.25$ has six Dirac points and is topologically
nontrivial with a $T^3$ spin relaxation rate below $T_c$. This picture provides
a possible explanation for the unconventional superconducting state of
Na$_x$CoO$_2\cdot y$H$_2$O. Analyzing a pairing model with strong correlation
using the Gutzwiller projection and symmetry arguments, we study these
topological phases and phase transitions as a function of Na doping.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:08:03 GMT"
},
{
"version": "v2",
"created": "Mon, 24 Dec 2007 19:58:20 GMT"
},
{
"version": "v3",
"created": "Thu, 1 May 2008 18:52:09 GMT"
}
] | 2008-05-30T00:00:00 | [
[
"Zhou",
"Sen",
""
],
[
"Wang",
"Ziqiang",
""
]
] | [
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] |
712.1043 | So Takei | So Takei and Yong Baek Kim | Nonequilibrium-induced metal-superconductor quantum phase transition in
graphene | 13 pages, 8 figures | Phys. Rev. B 78, 165401 (2008) | 10.1103/PhysRevB.78.165401 | null | cond-mat.str-el cond-mat.mes-hall | null | We study the effects of dissipation and time-independent nonequilibrium drive
on an open superconducting graphene. In particular, we investigate how
dissipation and nonequilibrium effects modify the semi-metal-BCS quantum phase
transition that occurs at half-filling in equilibrium graphene with attractive
interactions. Our system consists of a graphene sheet sandwiched by two
semi-infinite three-dimensional Fermi liquid reservoirs, which act both as a
particle pump/sink and a source of decoherence. A steady-state charge current
is established in the system by equilibrating the two reservoirs at different,
but constant, chemical potentials. The nonequilibrium BCS superconductivity in
graphene is formulated using the Keldysh path integral formalism, and we obtain
generalized gap and number density equations valid for both zero and finite
voltages. The behaviour of the gap is discussed as a function of both
attractive interaction strength and electron densities for various
graphene-reservoir couplings and voltages. We discuss how tracing out the
dissipative environment (with or without voltage) leads to decoherence of
Cooper pairs in the graphene sheet, hence to a general suppression of the gap
order parameter at all densities. For weak enough attractive interactions we
show that the gap vanishes even for electron densities away from half-filling,
and illustrate the possibility of a dissipation-induced metal-superconductor
quantum phase transition. We find that the application of small voltages does
not alter the essential features of the gap as compared to the case when the
system is subject to dissipation alone (i.e. zero voltage).
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:11:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Takei",
"So",
""
],
[
"Kim",
"Yong Baek",
""
]
] | [
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] |
712.1044 | J. L. Marshall | J. L. Marshall (OCIW) | Finding Extreme Subdwarfs | 23 pages, 10 figures. Submitted to AJ | null | 10.1088/0004-6256/135/3/1000 | null | astro-ph | null | I develop a new technique to identify M-type extreme subdwarfs (esdMs) and
demonstrate that it is substantially more efficient than previous methods. I
begin by obtaining spectroscopy and improved photometry of a sample of 54
late-type halo candidates using the rNLTT reduced proper motion (RPM) diagram.
From spectroscopy, I find that four of these are esdMs, three of which were
previously unknown. From the improved photometry, I show that all four lie in a
narrow RPM corridor that contains only 4 non-esdMs. Hence, with good photometry
(i.e., without spectroscopy), it appears possible to select esdM candidates
with a 50% esdM yield. This is more than an order of magnitude more efficient
than previous methods.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:12:23 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Marshall",
"J. L.",
"",
"OCIW"
]
] | [
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] |
712.1045 | K. K. Gan | K.K. Gan, et al | Optical Link of the Atlas Pixel Detector | 9th ICATPP Conference, Como, Italy | null | 10.1016/j.nima.2006.09.042 | null | physics.ins-det hep-ex | null | The on-detector optical link of the ATLAS pixel detector contains
radiation-hard receiver chips to decode bi-phase marked signals received on PIN
arrays and data transmitter chips to drive VCSEL arrays. The components are
mounted on hybrid boards (opto-boards). We present results from the irradiation
studies with 24 GeV protons up to 32 Mrad (1.2 x 10^15 p/cm^2) and the
experience from the production.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 22:21:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Gan",
"K. K.",
""
]
] | [
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712.1046 | Piergiulio Tempesta | Stefano Marmi and Piergiulio Tempesta | Polylogarithms, hyperfunctions and generalized Lipschitz summation
formulae | 15 pages | null | null | null | math.NT math-ph math.CV math.MP | null | A generalization of the classical Lipschitz summation formula is proposed. It
involves new polylogarithmic rational functions constructed via the Fourier
expansion of certain sequences of Bernoulli--type polynomials. Related families
of one--dimensional hyperfunctions are also constructed.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:42:28 GMT"
}
] | 2007-12-16T00:00:00 | [
[
"Marmi",
"Stefano",
""
],
[
"Tempesta",
"Piergiulio",
""
]
] | [
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] |
712.1047 | Drew Armstrong | Drew Armstrong | The sorting order on a Coxeter group | 34 pages, 7 figures. Final version, to appear in Journal of
Combinatorial Theory Series A | null | null | null | math.CO math.GR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let $(W,S)$ be an arbitrary Coxeter system. For each word $\omega$ in the
generators we define a partial order--called the {\sf $\omega$-sorting
order}--on the set of group elements $W_\omega\subseteq W$ that occur as
subwords of $\omega$. We show that the $\omega$-sorting order is a
supersolvable join-distributive lattice and that it is strictly between the
weak and Bruhat orders on the group. Moreover, the $\omega$-sorting order is a
"maximal lattice" in the sense that the addition of any collection of Bruhat
covers results in a nonlattice. Along the way we define a class of structures
called {\sf supersolvable antimatroids} and we show that these are equivalent
to the class of supersolvable join-distributive lattices.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 20:08:40 GMT"
},
{
"version": "v2",
"created": "Mon, 30 Mar 2009 18:48:35 GMT"
}
] | 2009-03-30T00:00:00 | [
[
"Armstrong",
"Drew",
""
]
] | [
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] |
712.1048 | Thaddeus Ladd | A. Pawlis, M. Panfilova, D. J. As, K. Lischka, K. Sanaka, T. D. Ladd,
Y. Yamamoto | Lasing of donor-bound excitons in ZnSe microdisks | 4 pages, 3 figures; introduction rewritten | null | 10.1103/PhysRevB.77.153304 | null | quant-ph | null | Excitons bound to flourine atoms in ZnSe have the potential for several
quantum optical applications. Examples include optically accessible quantum
memories for quantum information processing and lasing without inversion. These
applications require the bound-exciton transitions to be coupled to cavities
with high cooperativity factors, which results in the experimental observation
of low-threshold lasing. We report such lasing from fluorine-doped ZnSe quantum
wells in 3 and 6 micron microdisk cavities. Photoluminescence and selective
photoluminescence spectroscopy confirm that the lasing is due to bound-exciton
transitions.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:34:52 GMT"
},
{
"version": "v2",
"created": "Tue, 22 Jan 2008 03:18:59 GMT"
},
{
"version": "v3",
"created": "Fri, 7 Mar 2008 01:30:25 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Pawlis",
"A.",
""
],
[
"Panfilova",
"M.",
""
],
[
"As",
"D. J.",
""
],
[
"Lischka",
"K.",
""
],
[
"Sanaka",
"K.",
""
],
[
"Ladd",
"T. D.",
""
],
[
"Yamamoto",
"Y.",
""
]
] | [
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] |
712.1049 | Azar Mustafayev | Alexander Belyaev (1), Shahida Dar (2), Ilia Gogoladze (2), Azar
Mustafayev (3), Qaisar Shafi (2) ((1) Southampton U., (2) Bartol Research
Inst. and Delaware U., (3) Kansas U.) | Interplay of Higgs and Sparticle Masses in the CMSSM with updated SUSY
constraints | 26 pages, 14 figures; reference and comments added, mistake in fig.14
corrected | null | null | BA-07-029 | hep-ph | null | We estimate the bounds on Higgs and sparticle masses and discuss their
correlations in the constrained minimal supersymmetric standard model (CMSSM).
In our analysis we have applied the present constraints from collider and low
energy experiments, as well as the experimental bound on cold dark matter from
WMAP. For a given lightest Higgs boson mass, which is expected to be measured
with good precision at the LHC, we find important correlations between the
Higgs and sparticle masses which allows one to delineate the MSSM model
parameters and particle spectra. We have also demonstrated an important
complementarity between the LHC and direct dark matter detection experiments
emphasizing that by including the experimental input both from collider physics
and from dark matter detection experiments, one would significantly improve the
measurement of the SUSY spectrum and the underlying parameter space.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:12:42 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Jan 2008 20:26:33 GMT"
}
] | 2011-11-10T00:00:00 | [
[
"Belyaev",
"Alexander",
""
],
[
"Dar",
"Shahida",
""
],
[
"Gogoladze",
"Ilia",
""
],
[
"Mustafayev",
"Azar",
""
],
[
"Shafi",
"Qaisar",
""
]
] | [
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] |
712.105 | David H. Cohen | David H. Cohen, Maurice A. Leutenegger, Richard H. D. Townsend | Quantitative analysis of resolved X-ray emission line profiles of O
stars | Appearing in "Clumping in Hot Star Winds," eds. Hamann, Feldmeier, &
Oskinova, Potsdam: Univ.-Verl., 2007; 3 pages; 5 color figures | null | null | null | astro-ph | null | By quantitatively fitting simple emission line profile models that include
both atomic opacity and porosity to the Chandra X-ray spectrum of $\zeta$ Pup,
we are able to explore the trade-offs between reduced mass-loss rates and wind
porosity. We find that reducing the mass-loss rate of $\zeta$ Pup by roughly a
factor of four, to 1.5 \times 10^{-6} M_sun/yr, enables simple non-porous wind
models to provide good fits to the data. If, on the other hand, we take the
literature mass-loss rate of 6 \times 10^{-6} M_sun/yr, then to produce X-ray
line profiles that fit the data, extreme porosity lengths -- of $h_{\infty}
\approx 3$ Rstar -- are required. Moreover, these porous models do not provide
better fits to the data than the non-porous, low optical depth models.
Additionally, such huge porosity lengths do not seem realistic in light of 2-D
numerical simulations of the wind instability.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 21:40:03 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Cohen",
"David H.",
""
],
[
"Leutenegger",
"Maurice A.",
""
],
[
"Townsend",
"Richard H. D.",
""
]
] | [
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] |
712.1051 | Alessandro Bettini | Alessandro Bettini | The world underground scientific facilities. A compendium | null | null | null | null | hep-ex | null | Underground laboratories provide the low radioactive background environment
necessary to explore the highest energy scales that cannot be reached with
accelerators, by searching for extremely rare phenomena. I have requested to
the Directors of the Laboratories a standard set of questions on the principal
characteristics of their laboratory and collected them in this compendium. I
included the ideas and plans for short-range developments. However,
next-generation structures, such as those for megaton-size detectors, are not
discussed. A short version of this work will be published in the Proccedings of
TAUP 2007.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 14:15:24 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Bettini",
"Alessandro",
""
]
] | [
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0.0193281658,
-0.0263552275
] |
712.1052 | Jelte de Jong | Jelte T. A. de Jong, Konrad H. Kuijken, Philippe Heraudeau | Ground-based variability surveys towards Centaurus A: worthwhile or not? | 8 pages, 7 figures, accepted for publication in Astronomy and
Astrophysics | A&A 478, 755-762 (2008) | 10.1051/0004-6361:20078378 | null | astro-ph | null | Context: Difference imaging has proven to be a powerful technique for
detecting and monitoring the variability of unresolved stellar sources in M 31.
Using this technique in surveys of galaxies outside the Local Group could have
many interesting applications. Aims: The goal of this paper is to test
difference imaging photometry on Centaurus A, the nearest giant elliptical
galaxy, at a distance of 4 Mpc. Methods: We obtained deep photometric data with
the Wide Field Imager at the ESO/MPG 2.2m at La Silla spread over almost two
months. Applying the difference imaging photometry package DIFIMPHOT, we
produced high-quality difference images and detected variable sources. The
sensitivity of the current observational setup was determined through
artificial residual tests. Results: In the resulting high-quality difference
images, we detect 271 variable stars. We find a difference flux detection limit
corresponding to m_R~24.5. Based on a simple model of the halo of Centaurus A,
we estimate that a ground-based microlensing survey would detect in the order
of 4 microlensing events per year due to lenses in the halo. Conclusions:
Difference imaging photometry works very well at the distance of Centaurus A
and promises to be a useful tool for detecting and studying variable stars in
galaxies outside the local group. For microlensing surveys, a higher
sensitivity is needed than achieved here, which would be possible with a large
ground-based telescope or space observatory with wide-field imaging
capabilities.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 13:17:01 GMT"
}
] | 2008-03-11T00:00:00 | [
[
"de Jong",
"Jelte T. A.",
""
],
[
"Kuijken",
"Konrad H.",
""
],
[
"Heraudeau",
"Philippe",
""
]
] | [
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712.1053 | Giorgio Torrieri | Jorge Noronha, Giorgio Torrieri, Miklos Gyulassy | Near Zone Navier-Stokes Analysis of Heavy Quark Jet Quenching in an
$\mathcal{N}$ =4 SYM Plasma | new revised version, 11 figures, as published in PRC | Phys.Rev.C78:024903,2008 | 10.1103/PhysRevC.78.024903 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The near zone energy-momentum tensor of a supersonic heavy quark jet moving
through a strongly-coupled $\mathcal{N}=4$ SYM plasma is analyzed in terms of
first-order Navier-Stokes hydrodynamics. It is shown that the hydrodynamical
description of the near quark region worsens with increasing quark velocities.
For realistic quark velocities, $v=0.99$, the non-hydrodynamical region is
located at a narrow band surrounding the quark with a width of approximately
$3/\pi T$ in the direction parallel to the quark's motion and with a length of
roughly $10/\pi T$ in the perpendicular direction. Our results can be
interpreted as an indication of the presence of coherent Yang-Mills fields
where deviation from hydrodynamics is at its maximum. In the region where
hydrodynamics does provide a good description of the system's dynamics, the
flow velocity is so small that all the nonlinear terms can be dropped. Our
results, which are compatible with the thermalization timescales extracted from
elliptic flow measurements, suggest that if AdS/CFT provides a good description
of the RHIC system, the bulk of the quenched jet energy has more than enough
time to locally thermalize and become encoded in the collective flow. The
resulting flow pattern close to the quark, however, is shown to be considerably
different than the superposition of Mach cones and diffusion wakes observed at
large distances.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 22:07:35 GMT"
},
{
"version": "v2",
"created": "Mon, 18 Feb 2008 13:59:05 GMT"
},
{
"version": "v3",
"created": "Mon, 15 Sep 2008 14:41:44 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Noronha",
"Jorge",
""
],
[
"Torrieri",
"Giorgio",
""
],
[
"Gyulassy",
"Miklos",
""
]
] | [
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] |
712.1054 | Joo Heon Yoon | Joo H. Yoon, Kevin Schawinski, Yun-Kyeong Sheen, Chang H. Ree, and
Sukyoung K. Yi | A Spectro-photometric Search for Galaxy Clusters in SDSS | Web-page address has been revised and minor corrections are done | null | 10.1086/528958 | null | astro-ph | null | Recent large-scale galaxy spectroscopic surveys, such as the Sloan Digital
Sky Survey (SDSS), enable us to execute a systematic, relatively-unbiased
search for galaxy clusters. Such surveys make it possible to measure the 3-d
distribution of galaxies but are hampered by the incompleteness problem due to
fiber collisions. In this study we aim to develop a density measuring technique
that alleviates the problem and derives densities more accurately by adding
additional cluster member galaxies that follow optical color-magnitude
relations for the given redshift. The new density measured with both
spectroscopic and photometric data shows a good agreement with apparent
information on cluster images and is supported by follow-up observations. By
adopting this new method, a total of 924 $robust$ galaxy clusters are found
from the SDSS DR5 database in the redshift range $0.05<z<0.1$, of which 212 are
new. Local maximum-density galaxies successfully represent cluster centers. We
provide the cluster catalogue including a number of cluster parameters.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 11:40:56 GMT"
},
{
"version": "v2",
"created": "Mon, 10 Dec 2007 15:18:34 GMT"
},
{
"version": "v3",
"created": "Mon, 17 Mar 2008 04:56:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yoon",
"Joo H.",
""
],
[
"Schawinski",
"Kevin",
""
],
[
"Sheen",
"Yun-Kyeong",
""
],
[
"Ree",
"Chang H.",
""
],
[
"Yi",
"Sukyoung K.",
""
]
] | [
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] |
712.1055 | Piet Brouwer | Piet W. Brouwer and Joern N. Kupferschmidt | Interaction correction to the conductance of a ballistic conductor | 4 pages, 2 figures | null | 10.1103/PhysRevLett.100.246805 | null | cond-mat.mes-hall | null | In disordered metals, electron-electron interactions are the origin of a
small correction to the conductivity, the "Altshuler-Aronov correction". Here
we investigate the Altshuler-Aronov correction of a conductor in which the
electron motion is ballistic and chaotic. We consider the case of a double
quantum dot, which is the simplest example of a ballistic conductor in which
the Altshuler-Aronov correction is nonzero. The fact that the electron motion
is ballistic leads to an exponential suppression of the correction if the
Ehrenfest time is larger than the mean dwell time or the inverse temperature.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 20:23:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brouwer",
"Piet W.",
""
],
[
"Kupferschmidt",
"Joern N.",
""
]
] | [
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712.1056 | Michael Efroimsky | Michael Efroimsky | Can the tidal quality factors of terrestrial planets and moons scale as
positive powers of the tidal frequency? | arXiv admin note: text overlap with arXiv:astro-ph/0605521 | null | null | null | astro-ph physics.class-ph physics.geo-ph | http://creativecommons.org/licenses/publicdomain/ | In geophysics and seismology, it is a common knowledge that the quality
factors Q of the mantle and crust materials scale as the tidal frequency to a
positive fractional power (Karato 2007, Efroimsky and Lainey 2007). In
astronomy, there exists an equally common belief that such rheological models
introduce discontinuities into the equations and thus are unrealistic at low
frequencies. We demonstrate that, while such models indeed make the
conventional expressions for the tidal torque diverge for vanishing
frequencies, the emerging infinities reveal not the impossible nature of one or
another rheology, but a subtle flaw in the underlying mathematical model of
friction. Flawed is the common misassumption that the tidal force and torque
are inversely proportional to the quality factor. In reality, they are
proportional to the sine of the tidal phase lag, while the inverse quality
factor is commonly identified with the tangent of the lag. The sine and tangent
of the lag are close everywhere {\it{except in the vicinity of the zero
frequency}}. Reinstating of this detail tames the fake infinities and
rehabilitates the "impossible" scaling law (which happens to be the actual law
the mantles obey). This preprint is a pilot paper. A more comprehensive
treatise on tidal torques is to be published (Efroimsky and Williams 2009).
| [
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"created": "Wed, 29 Jun 2011 00:45:11 GMT"
},
{
"version": "v9",
"created": "Mon, 27 Feb 2012 23:01:41 GMT"
}
] | 2012-03-19T00:00:00 | [
[
"Efroimsky",
"Michael",
""
]
] | [
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712.1057 | Michael R. Meyer | M.R. Meyer (The University of Arizona), J.M. Carpenter (Caltech), E.E.
Mamajek (Harvard-Smithsonian CfA), L.A. Hillenbrand (Caltech), D. Hollenbach
(NASA-Ames), A. Moro-Martin (Princetone), J.S. Kim (The University of
Arizona), M.D. Silverstone (The University of Arizona), J. Najita (NOAO),
D.C. Hines (Space Sciences Institute), I. Pascucci (The University of
Arizona), J.R. Stauffer (Spitzer Science Center), J. Bouwman (Max-Planck
Institut fuer Astronomie), D.E. Backman (SETI Institute) | Evolution of Mid-IR Excess Around Sun-like Stars: Constraints on Models
of Terrestrial Planet Formation | Accepted for publication in the Astrophysical Journal Letters | null | 10.1086/527470 | null | astro-ph | null | We report observations from the Spitzer Space Telescope (SST) regarding the
frequency of 24 micron excess emission toward sun-like stars. Our unbiased
sample is comprised of 309 stars with masses 0.7-2.2 Msun and ages from <3 Myr
to >3 Gyr that lack excess emission at wavelengths <=8 microns. We identify 30
stars that exhibit clear evidence of excess emission from the observed 24/8
micron flux ratio. The implied 24 micron excesses of these candidate debris
disk systems range from 13 % (the minimum detectable) to more than 100 %
compared to the expected photospheric emission. The frequency of systems with
evidence for dust debris emitting at 24 micron ranges from 8.5-19 % at ages
<300 Myr to < 4 % for older stars. The results suggest that many, perhaps most,
sun-like stars might form terrestrial planets.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 23:09:43 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Meyer",
"M. R.",
"",
"The University of Arizona"
],
[
"Carpenter",
"J. M.",
"",
"Caltech"
],
[
"Mamajek",
"E. E.",
"",
"Harvard-Smithsonian CfA"
],
[
"Hillenbrand",
"L. A.",
"",
"Caltech"
],
[
"Hollenbach",
"D.",
"",
"NASA-Ames"
],
[
"Moro-Martin",
"A.",
"",
"Princetone"
],
[
"Kim",
"J. S.",
"",
"The University of\n Arizona"
],
[
"Silverstone",
"M. D.",
"",
"The University of Arizona"
],
[
"Najita",
"J.",
"",
"NOAO"
],
[
"Hines",
"D. C.",
"",
"Space Sciences Institute"
],
[
"Pascucci",
"I.",
"",
"The University of\n Arizona"
],
[
"Stauffer",
"J. R.",
"",
"Spitzer Science Center"
],
[
"Bouwman",
"J.",
"",
"Max-Planck\n Institut fuer Astronomie"
],
[
"Backman",
"D. E.",
"",
"SETI Institute"
]
] | [
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712.1058 | Ilarion Melnikov | Ilarion V. Melnikov, Savdeep Sethi | Half-Twisted (0,2) Landau-Ginzburg Models | 20 pages; typos corrected; reference added; published version | JHEP0803:040,2008 | 10.1088/1126-6708/2008/03/040 | EFI-07-37 | hep-th | null | We compute correlators of chiral operators in (0,2) supersymmetric
Landau-Ginzburg theories. The class of theories and the correlators we study
are relevant for extending and testing mirror symmetry away from the (2,2)
locus. More generally, these methods provide alpha'-exact results about certain
superpotential couplings in compactifications of the heterotic string.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 23:27:09 GMT"
},
{
"version": "v2",
"created": "Tue, 12 Feb 2008 18:59:50 GMT"
},
{
"version": "v3",
"created": "Wed, 26 Mar 2008 16:00:21 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Melnikov",
"Ilarion V.",
""
],
[
"Sethi",
"Savdeep",
""
]
] | [
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] |
712.1059 | Fernando Moreno-Insertis | F. Moreno-Insertis, K. Galsgaard, I. Ugarte-Urra | Jets in coronal holes: Hinode observations and 3D computer modelling | 10 pages, 4 figures. Revised version submitted to ApJ Letters | null | 10.1086/527560 | null | astro-ph | null | Recent observations of coronal hole areas with the XRT and EIS instruments
onboard the Hinode satellite have shown with unprecedented detail the launching
of fast, hot jets away from the solar surface. In some cases these events
coincide with episodes of flux emergence from beneath the photosphere. In this
letter we show results of a 3D numerical experiment of flux emergence from the
solar interior into a coronal hole and compare them with simultaneous XRT and
EIS observations of a jet-launching event that accompanied the appearance of a
bipolar region in MDI magnetograms. The magnetic skeleton and topology that
result in the experiment bear a strong resemblance to linear force-fee
extrapolations of the SOHO/MDI magnetograms. A thin current sheet is formed at
the boundary of the emerging plasma. A jet is launched upward along the open
reconnected field lines with values of temperature, density and velocity in
agreement with the XRT and EIS observations. Below the jet, a split-vault
structure results with two chambers: a shrinking one containing the emerged
field loops and a growing one with loops produced by the reconnection. The
ongoing reconnection leads to a horizontal drift of the vault-and-jet
structure. The timescales, velocities, and other plasma properties in the
experiment are consistent with recent statistical studies of this type of
events made with Hinode data.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 23:18:09 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Moreno-Insertis",
"F.",
""
],
[
"Galsgaard",
"K.",
""
],
[
"Ugarte-Urra",
"I.",
""
]
] | [
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] |
712.106 | Takayuki Muto | Takayuki Muto, Masahiro N. Machida and Shu-ichiro Inutsuka | The Effect of Poloidal Magnetic Field on Type I Planetary Migration:
Significance of Magnetic Resonance | 33 pages, 10 figures, typos corrected, discussion added, reference
added, Accepted for publication in ApJ | null | 10.1086/587027 | null | astro-ph | null | We study the effect of poloidal magnetic field on type I planetary migration
by linear perturbation analysis in the shearing-sheet approximation and the
analytic results are compared with numerical calculations. In contrast to the
unmagnetized case, the basic equations that describe the wake due to the planet
in the disk allow magnetic resonances at which density perturbation diverges.
In order to simplify the problem, we consider the case without
magneto-rotational instability. We perform two sets of analyses:
two-dimensional and three-dimensional. In two-dimensional analysis, we find the
generalization of the torque formula previously known in unmagnetized case. In
three-dimensional calculations, we focus on the disk with very strong magnetic
field and derive a new analytic formula for the torque exerted on the planet.
We find that when Alfven velocity is much larger than sound speed,
two-dimensional torque is suppressed and three-dimensional modes dominate, in
contrast to the unmagnetized case.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 00:09:00 GMT"
},
{
"version": "v2",
"created": "Thu, 7 Feb 2008 10:25:19 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Muto",
"Takayuki",
""
],
[
"Machida",
"Masahiro N.",
""
],
[
"Inutsuka",
"Shu-ichiro",
""
]
] | [
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] |
712.1061 | Norman Christ | Y. Aoki, P.A. Boyle, N.H. Christ, C. Dawson, M.A. Donnellan, T.
Izubuchi, A. Juttner, S. Li, R.D. Mawhinney, J. Noaki, C.T. Sachrajda, A.
Soni, R.J. Tweedie, A. Yamaguchi | Non-perturbative renormalization of quark bilinear operators and B_K
using domain wall fermions | 80 pages and 33 figures | Phys.Rev.D78:054510,2008 | 10.1103/PhysRevD.78.054510 | BNL-HET-07/11, CU-TP-1180, Edinburgh 2007/12, KANAZAWA-07-10,
RBRC-681, SHEP-07-20 | hep-lat | null | We present a calculation of the renormalization coefficients of the quark
bilinear operators and the K-Kbar mixing parameter B_K. The coefficients
relating the bare lattice operators to those in the RI/MOM scheme are computed
non-perturbatively and then matched perturbatively to the MSbar scheme. The
coefficients are calculated on the RBC/UKQCD 2+1 flavor dynamical lattice
configurations. Specifically we use a 16^3 x 32 lattice volume, the Iwasaki
gauge action at beta=2.13 and domain wall fermions with L_s=16.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 23:27:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Aoki",
"Y.",
""
],
[
"Boyle",
"P. A.",
""
],
[
"Christ",
"N. H.",
""
],
[
"Dawson",
"C.",
""
],
[
"Donnellan",
"M. A.",
""
],
[
"Izubuchi",
"T.",
""
],
[
"Juttner",
"A.",
""
],
[
"Li",
"S.",
""
],
[
"Mawhinney",
"R. D.",
""
],
[
"Noaki",
"J.",
""
],
[
"Sachrajda",
"C. T.",
""
],
[
"Soni",
"A.",
""
],
[
"Tweedie",
"R. J.",
""
],
[
"Yamaguchi",
"A.",
""
]
] | [
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] |
712.1062 | Leonid Berlyand | L. Berlyand, V. Rybalko | Solutions with Vortices of a Semi-Stiff Boundary Value Problem for the
Ginzburg-Landau Equation | 42 pages, 1 figure | null | null | null | math.AP | null | We study solutions of the 2D Ginzburg-Landau equation -\Delta
u+\frac{1}{\ve^2}u(|u|^2-1)=0 subject to "semi-stiff" boundary conditions: the
Dirichlet condition for the modulus, |u|=1, and the homogeneous Neumann
condition for the phase. The principal result of this work shows there are
stable solutions of this problem with zeros (vortices), which are located near
the boundary and have bounded energy in the limit of small epsilon. For the
Dirichlet bondary condition ("stiff" problem), the existence of stable
solutions with vortices, whose energy blows up as epsilon goes to 0, is well
known. By contrast, stable solutions with vortices are not established in the
case of the homogeneous Neumann ("soft") boundary condition. (nonexistence is
proved for simply connected domains).
In this work, we develop a variational method which allows one to construct
local minimizers of the corresponding Ginzburg-Landau energy functional. We
introduce an approximate bulk degree as the key ingredient of this method, and,
unlike the standard degree over the curve, it is preserved in the weak
H^1-limit.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 23:34:23 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Berlyand",
"L.",
""
],
[
"Rybalko",
"V.",
""
]
] | [
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] |
712.1063 | David Schwab | David J. Schwab, Robijn F. Bruinsma, Joseph Rudnick, Jonathan Widom | Nucleosome Switching | 15 pages, 3 figures | null | 10.1103/PhysRevLett.100.228105 | null | cond-mat.soft cond-mat.stat-mech q-bio.GN | null | We present a statistical-mechanical analysis of the positioning of
nucleosomes along one of the chromosomes of yeast DNA as a function of the
strength of the binding potential and of the chemical potential of the
nucleosomes. We find a significant density of two-level nucleosome switching
regions where, as a function of the chemical potential, the nucleosome
distribution undergoes a "micro" first-order transition. The location of these
nucleosome switches shows a strong correlation with the location of
transcription-factor binding sites.
| [
{
"version": "v1",
"created": "Thu, 6 Dec 2007 23:39:26 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Schwab",
"David J.",
""
],
[
"Bruinsma",
"Robijn F.",
""
],
[
"Rudnick",
"Joseph",
""
],
[
"Widom",
"Jonathan",
""
]
] | [
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] |
712.1064 | Kaushik Mitra | Kaushik Mitra, C. J. Lobb, and C. A. R. S\'a de Melo | Environmentally-Induced Rabi Oscillations and Decoherence in Phase
Qubits | 4 pages, 4 figures | null | null | null | cond-mat.supr-con | null | We study decoherence effects in a dc SQUID phase qubit caused by an isolation
circuit with a resonant frequency. The coupling between the SQUID phase qubit
and its environment is modeled via the Caldeira-Leggett formulation of quantum
dissipation/coherence, where the spectral density of the environment is related
to the admittance of the isolation circuit. When the frequency of the qubit is
at least two times larger than the resonance frequency of the isolation
circuit, we find that the decoherence time of the qubit is two orders of
magnitude larger than the typical ohmic regime, where the frequency of the
qubit is much smaller than the resonance frequency of the isolation circuit.
Lastly, we show that when the qubit frequency is on resonance with the
isolation circuit, an oscillatory non-Markovian decay emerges, as the dc SQUID
phase qubit and its environment self-generate Rabi oscillations of
characteristic time scales shorter than the decoherence time.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 00:00:46 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Mitra",
"Kaushik",
""
],
[
"Lobb",
"C. J.",
""
],
[
"de Melo",
"C. A. R. Sá",
""
]
] | [
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] |
712.1065 | Zhendong Wang | Zhendong Wang, Sumit Mazumdar, Alok Shukla | Essential optical states in $\pi$-conjugated polymer thin films | null | null | null | null | cond-mat.str-el | null | We develop a theory of the electronic structure and photophysics of
interacting chains of $\pi$-conjugated polymers to understand the differences
between solutions and films. While photoexcitation generates only the exciton
in solutions, the optical exciton as well as weakly allowed excimers are
generated in films. Photoinduced absorption in films is primarily from the
lowest excimer. We are also able to explain peculiarities associated with
photoluminescence, including delayed photoluminescence and its quenching by
electric field.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 00:17:59 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Wang",
"Zhendong",
""
],
[
"Mazumdar",
"Sumit",
""
],
[
"Shukla",
"Alok",
""
]
] | [
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] |
712.1066 | Graeme Milton | Graeme W. Milton and Pierre Seppecher | Realizable response matrices of multiterminal electrical, acoustic, and
elastodynamic networks at a given frequency | 22 pages, 5 figures | null | 10.1098/rspa.2007.0345 | null | cond-mat.mtrl-sci | null | We give a complete characterization of the possible response matrices at a
fixed frequency of n-terminal electrical networks of inductors, capacitors,
resistors and grounds, and of n-terminal discrete linear elastodynamic networks
of springs and point masses, both in the three-dimensional case and in the
two-dimensional case. Specifically we construct networks which realize any
response matrix which is compatible with the known symmetry properties and
thermodynamic constraints of response matrices. Due to a mathematical
equivalence we also obtain a characterization of the response matrices of
discrete acoustic networks.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 00:27:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Milton",
"Graeme W.",
""
],
[
"Seppecher",
"Pierre",
""
]
] | [
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] |
712.1067 | Cliff Senkbeil | C. E. Senkbeil, S. P. Ellingsen, J. E. J. Lovell, J.-P. Macquart, G.
Cim\`o, D. L. Jauncey | A Compact Extreme Scattering Event Cloud Towards AO 0235+164 | 11 pages, 2 figures | null | 10.1086/527300 | null | astro-ph | null | We present observations of a rare, rapid, high amplitude Extreme Scattering
Event toward the compact BL-Lac AO 0235+164 at 6.65 GHz. The ESE cloud is
compact; we estimate its diameter between 0.09 and 0.9 AU, and is at a distance
of less than 3.6 kpc. Limits on the angular extent of the ESE cloud imply a
minimum cloud electron density of ~ 4 x 10^3 cm^-3. Based on the amplitude and
timescale of the ESE observed here, we suggest that at least one of the
transients reported by Bower et al. (2007) may be attributed to ESEs.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 01:57:13 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Senkbeil",
"C. E.",
""
],
[
"Ellingsen",
"S. P.",
""
],
[
"Lovell",
"J. E. J.",
""
],
[
"Macquart",
"J. -P.",
""
],
[
"Cimò",
"G.",
""
],
[
"Jauncey",
"D. L.",
""
]
] | [
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] |
712.1068 | Motomichi Tashiro | Motomichi Tashiro | Exchange effects in elastic collisions of spin-polarized electrons with
open-shell molecules with $^3\Sigma_g^-$ symmetry | Phys. Rev. A, in press | Physical Review A 77, 012723 (2008). | 10.1103/PhysRevA.77.012723 | null | physics.chem-ph physics.atom-ph | null | The spin-exchange effect in spin-polarized electron collisions with
unpolarized open-shell molecules, O$_2$, B$_2$, S$_2$ and Si$_2$, has been
studied by the R-matrix method with the fixed-bond approximation. All of these
molecules have ${}^3 \Sigma_{g}^{-}$ symmetry in their ground states. Usual
integrated cross sections with unpolarized electrons has also been studied. We
used the complete active space self consistent field orbitals and put more than
10 target electronic states in the R-matrix models. In electron O$_2$ elastic
collisions, calculated polarization fractions agree well with the experimental
results, especially around the ${}^4 \Sigma_u^-$ resonance. In e-B$_2$, S$_2$
and Si$_2$ elastic collisions, larger spin-exchange effect is observed compared
to the e-O$_2$ elastic collisions. In all four cases, spin-exchange effect
becomes prominent near resonances. This association of resonance and magnitude
of the spin-exchange effect was studied by explicitly removing the resonance
configurations from the R-matrix calculations. In general, spin-exchange effect
is larger in e-B$_2$ collisions than in e-S$_2$ and Si$_2$ collisions, and is
smallest in e-O$_2$ collisions.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 01:44:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Tashiro",
"Motomichi",
""
]
] | [
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] |
712.1069 | Jonathan Hillman | Jonathan A. Hillman | Strongly minimal PD4-complexes | 17 pages | Topology and its Applications 156 (2009), 1565--1577 | 10.1016/j.topol.2009.01.006 | null | math.GT | null | We consider the homotopy types of $PD_4$-complexes $X$ with fundamental group
$\pi$ such that $c.d.\pi=2$ and $\pi$ has one end. Let $\beta=\beta_2(\pi;F_2)$
and $w=w_1(X)$. Our main result is that (modulo two technical conditions on
$(\pi,w)$) there are at most $2^\beta$ orbits of $k$-invariants determining
"strongly minimal" complexes (i.e., those with homotopy intersection pairing
$\lambda_X$ trivial). The homotopy type of a $PD_4$-complex $X$ with $\pi$ a
$PD_2$-group is determined by $\pi$, $w$, $\lambda_X$ and the $v_2$-type of
$X$. Our result also implies that Fox's 2-knot with metabelian group is
determined up to TOP isotopy and reflection by its group.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 02:09:30 GMT"
}
] | 2011-10-20T00:00:00 | [
[
"Hillman",
"Jonathan A.",
""
]
] | [
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] |
712.107 | Kun L\"u | Kun L\"u and Jing-Dong Bao | State transition of a non-Ohmic damping system in a corrugated plane | 7 pages,7 figures | Physical Review E 76, 061119 (2007) | 10.1103/PhysRevE.76.061119 | null | cond-mat.stat-mech | null | Anomalous transport of a particle subjected to non-Ohmic damping of the power
$\delta$ in a tilted periodic potential is investigated via Monte Carlo
simulation of generalized Langevin equation. It is found that the system
exhibits two relative motion modes: the locking state and the running state.
Under the surrounding of sub-Ohmic damping ($0<\delta<1$), the particle should
transfer into a running state from a locking state only when local minima of
the potential vanish; hence the particle occurs a synchronization oscillation
in its mean displacement and mean square displacement (MSD). In particular, the
two motion modes are allowed to coexist in the case of super-Ohmic damping
($1<\delta<2$) for moderate driving forces, namely, where exists double centers
in the velocity distribution. This induces the particle having faster
diffusion, i.e., its MSD reads $<\Delta x^2(t)> = 2D^{(\delta)}_{eff}
t^{\delta_{eff}}$. Our result shows that the effective power index
$\delta_{\textmd{eff}}$ can be enhanced and is a nonmonotonic function of the
temperature and the driving force. The mixture effect of the two motion modes
also leads to a breakdown of hysteresis loop of the mobility.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 02:33:35 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lü",
"Kun",
""
],
[
"Bao",
"Jing-Dong",
""
]
] | [
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] |
712.1071 | Xuejuan Yang | Xue-juan Yang, Fang-jun Lu, Li Chen | High spatial resolution X-ray spectroscopy of SNR Cassiopeia A with {\sl
Chandra} | accepted by ChJAA | null | 10.1088/1009-9271/8/4/08 | null | astro-ph | null | We present high spatial resolution X-ray spectroscopy of supernova remnant
Cassiopeia A with the {\sl Chandra} observations. The X-ray emitting region of
this remnant was divided into 38 $\times$ 34 pixels with a scale of 10$\arcsec$
$\times$ 10$\arcsec$ each. Spectra of 960 pixels were created and fitted with
an absorbed two component non-equilibrium ionization model. With the spectral
analysis results we obtained maps of absorbing column density, temperatures,
ionization ages, and the abundances for Ne, Mg, Si, S, Ca and Fe. The Si, S and
possibly Ca abundance maps show obviously jet structures, while Fe doesn't
follow the jet but seems to be distributed perpendicular to it. In the range of
about two orders of magnitude, the abundances of Si, S and Ca show tight
correlations between each other, suggesting them to be ejecta from explosive
O-burning and incomplete Si-burning. Meanwhile, Ne abundance is well correlated
with that of Mg, indicating them to be the ashes of explosive C/Ne burning. The
Fe abundance is positively correlated with that of Si when Si abundance is
lower than 3 solar abundances, but a negative correlation appears when the Si
abundance is higher. We suggest that such a two phase correlation is the
results of different ways in which Fe is synthesized.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 02:42:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Yang",
"Xue-juan",
""
],
[
"Lu",
"Fang-jun",
""
],
[
"Chen",
"Li",
""
]
] | [
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] |
712.1072 | Aidan Sims | Alex Kumjian, David Pask, Aidan Sims | Generalised morphisms of k-graphs: k-morphs | 27 pages, four pictures drawn with Tikz. Version 2: title changed and
numerous minor corrections and improvements. This version to appear in Trans.
Amer. Math. Soc | null | null | null | math.OA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a number of recent papers, (k+l)-graphs have been constructed from
k-graphs by inserting new edges in the last l dimensions. These constructions
have been motivated by C*-algebraic considerations, so they have not been
treated systematically at the level of higher-rank graphs themselves. Here we
introduce k-morphs, which provide a systematic unifying framework for these
various constructions. We think of k-morphs as the analogue, at the level of
k-graphs, of C*-correspondences between C*-algebras. To make this analogy
explicit, we introduce a category whose objects are k-graphs and whose
morphisms are isomorphism classes of k-morphs. We show how to extend the
assignment \Lambda \mapsto C*(\Lambda) to a functor from this category to the
category whose objects are C*-algebras and whose morphisms are isomorphism
classes of C*-correspondences.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 03:16:21 GMT"
},
{
"version": "v2",
"created": "Wed, 9 Jun 2010 11:58:59 GMT"
}
] | 2010-06-10T00:00:00 | [
[
"Kumjian",
"Alex",
""
],
[
"Pask",
"David",
""
],
[
"Sims",
"Aidan",
""
]
] | [
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] |
712.1073 | Yijun He | Zejun Hu, Haizhong Li, Luc Vrancken | A characterisation of the Calabi product of hyperbolic affine spheres | 14pages | null | null | null | math.DG | null | There exists a well known construction which allows to associate with two
hyperbolic affine spheres $f_i: M_i^{n_i} \to \mathbb R^{n_i+1}$ a new
hyperbolic affine sphere immersion of $I \times M_1 \times M_2$ into $\mathbb
R^{n_1+n_2+3}$. In this paper we deal with the inverse problem: how to
determine from properties of the difference tensor whether a given hyperbolic
affine sphere immersion of a manifold $M^n \to \mathbb R^{n+1}$ can be
decomposed in such a way.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 03:21:21 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Hu",
"Zejun",
""
],
[
"Li",
"Haizhong",
""
],
[
"Vrancken",
"Luc",
""
]
] | [
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] |
712.1074 | Ilya Shkredov | I. D. Shkredov | On sumsets of dissociated sets | 25 pages | null | null | null | math.NT math.CO | null | In the paper we are studying some properties of subsets Q of sums of
dissociated sets. The exact upper bound for the number of solutions of the
following equation
(1) q_1 + ... + q_p = q_{p+1} + ... + q_{2p}, q_i \in Q
in groups F_2^n is found. Using our approach, we easily prove a recent result
of J. Bourgain on sets of large exponential sums and obtain a tiny improvement
of his theorem. Besides an inverse problem is considered in the article. Let Q
be a set belonging a sumset of two dissociated sets such that equation (1) has
many solutions. We prove that in the case the large proportion of Q is highly
structured.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 03:39:37 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Shkredov",
"I. D.",
""
]
] | [
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] |
712.1075 | Lori D. Paniak | L.D. Paniak and P.M. Charland | The Jacobian as a measure of planar dose congruence | 9 pages, 2 figures | null | 10.1118/1.2982136 | null | physics.med-ph | null | We propose a new starting point for comparing dose distributions in
therapeutic radiation physics using a Jacobian-based measure. The measure is
normalization independent, free of tunable parameters, bounded and converges to
a unique value when comparing unrelated dose distributions. We present a
preliminary demonstration of the sensitivity and general characteristics of
this measure.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 03:57:25 GMT"
}
] | 2015-05-13T00:00:00 | [
[
"Paniak",
"L. D.",
""
],
[
"Charland",
"P. M.",
""
]
] | [
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] |
712.1076 | Michael Stewart Jr | M. D. Stewart Jr, Aijun Yin, J. M. Xu, J. M. Valles Jr | Field Tuned Superconductor to Insulator Transitions in an Amorphous Film
with an Imposed Multiply Connected Geometry | 4 pages, 4 figures | null | null | null | cond-mat.supr-con | null | We have observed multiple magnetic field driven superconductor to insulator
transitions (SIT) in amorphous Bi films perforated with a nano-honeycomb (NHC)
array of holes. The period of the magneto-resistance, H=H_M=h/2eS where S is
the area of a unit cell of holes, indicates the field driven transitions are
boson dominated. The field-dependent resistance follows
R(T)=R_0(H)exp(T_0(H)/T) on both sides of the transition so that the evolution
between these states is controlled by the vanishing of T_0 to0. We compare our
results to the thickness driven transition in NHC films and the field driven
transitions in unpatterned Bi films, other materials, and Josephson junction
arrays. Our results suggest a structural source for similar behavior found in
some materials and that despite the clear bosonic nature of the SITs,
quasiparticle degrees of freedom likely also play an important part in the
evolution of the SIT.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 03:57:27 GMT"
}
] | 2007-12-10T00:00:00 | [
[
"Stewart",
"M. D.",
"Jr"
],
[
"Yin",
"Aijun",
""
],
[
"Xu",
"J. M.",
""
],
[
"Valles",
"J. M.",
"Jr"
]
] | [
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0.0444655195,
-0.0257655978,
-0.0248575583,
0.0929037109,
0.0038307882,
-0.0687839314,
0.0360377841,
-0.08632043,
0.0811559558,
-0.0393294245,
-0.0121662999
] |
712.1077 | Umesh Garg | S. Ray, N.S. Pattabiraman, Krishichayan, A. Chakraborty, S.
Mukhopadhyay, S.S. Ghugre, S.N. Chintalapudi, A.K. Sinha, U. Garg, S. Zhu, B.
Kharraja and D. Almehed | Level Structure of 103Ag at high spins | null | null | 10.1103/PhysRevC.77.024305 | null | nucl-ex | null | High spin states in $^{103}$Ag were investigated with the Gammasphere array,
using the $^{72}$Ge($^{35}$Cl,$2p2n$)$^{103}$Ag reaction at an incident beam
energy of 135 MeV. A $\Delta J$=1 sequence with predominantly magnetic
transitions and two nearly-degenerate $\Delta J=1$ doublet bands have been
observed. The dipole band shows a decreasing trend in the $B(M1)$ strength as
function of spin, a well established feature of magnetic bands. The
nearly-degenerate band structures satisfy the three experimental signatures of
chirality in the nuclei; however microscopic calculations are indicative of a
magnetic phenomenon
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 04:09:00 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ray",
"S.",
""
],
[
"Pattabiraman",
"N. S.",
""
],
[
"Krishichayan",
"",
""
],
[
"Chakraborty",
"A.",
""
],
[
"Mukhopadhyay",
"S.",
""
],
[
"Ghugre",
"S. S.",
""
],
[
"Chintalapudi",
"S. N.",
""
],
[
"Sinha",
"A. K.",
""
],
[
"Garg",
"U.",
""
],
[
"Zhu",
"S.",
""
],
[
"Kharraja",
"B.",
""
],
[
"Almehed",
"D.",
""
]
] | [
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] |
712.1078 | William Chin | William Chin, Leonid Krop | Representation theory of liftings of quantum planes | null | null | null | null | math.QA math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically determine the regular representations, quivers and
representation type of all liftings of two-dimensional quantum linear spaces.
| [
{
"version": "v1",
"created": "Fri, 7 Dec 2007 04:20:01 GMT"
},
{
"version": "v2",
"created": "Thu, 29 May 2008 17:49:21 GMT"
},
{
"version": "v3",
"created": "Mon, 12 Jan 2009 00:17:24 GMT"
}
] | 2009-01-12T00:00:00 | [
[
"Chin",
"William",
""
],
[
"Krop",
"Leonid",
""
]
] | [
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