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| versions
list | update_date
timestamp[s] | authors_parsed
sequence |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0705.3198 | Jean-Noel Roux | Ivana Agnolin (LMSGC), Jean-No\"el Roux (LMSGC) | Internal states of model isotropic granular packings. III. Elastic
properties | Published in Physical Review E 25 pages | Physical Review E: Statistical, Nonlinear, and Soft Matter Physics
76, 6 (2007) 061304 | 10.1103/PhysRevE.76.061304 | null | cond-mat.dis-nn cond-mat.mtrl-sci physics.class-ph | null | In this third and final paper of a series, elastic properties of numerically
simulated isotropic packings of spherical beads assembled by different
procedures and subjected to a varying confining pressure P are investigated. In
addition P, which determines the stiffness of contacts by Hertz's law, elastic
moduli are chiefly sensitive to the coordination number, the possible values of
which are not necessarily correlated with the density. Comparisons of numerical
and experimental results for glass beads in the 10kPa-10MPa range reveal
similar differences between dry samples compacted by vibrations and lubricated
packings. The greater stiffness of the latter, in spite of their lower density,
can hence be attributed to a larger coordination number. Voigt and Reuss bounds
bracket bulk modulus B accurately, but simple estimation schemes fail for shear
modulus G, especially in poorly coordinated configurations under low P.
Tenuous, fragile networks respond differently to changes in load direction, as
compared to load intensity. The shear modulus, in poorly coordinated packings,
tends to vary proportionally to the degree of force indeterminacy per unit
volume. The elastic range extends to small strain intervals, in agreement with
experimental observations. The origins of nonelastic response are discussed. We
conclude that elastic moduli provide access to mechanically important
information about coordination numbers, which escape direct measurement
techniques, and indicate further perspectives.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 15:32:58 GMT"
},
{
"version": "v2",
"created": "Thu, 21 Jun 2007 16:05:30 GMT"
},
{
"version": "v3",
"created": "Thu, 11 Oct 2007 14:44:02 GMT"
},
{
"version": "v4",
"created": "Tue, 18 Dec 2007 08:51:20 GMT"
}
] | 2016-09-08T00:00:00 | [
[
"Agnolin",
"Ivana",
"",
"LMSGC"
],
[
"Roux",
"Jean-Noël",
"",
"LMSGC"
]
] |
0705.3199 | Stephen Appleby | Stephen A. Appleby and Richard A. Battye | Do consistent $F(R)$ models mimic General Relativity plus $\Lambda$? | 8 pages, 4 figures. References added | Phys.Lett.B654:7-12,2007 | 10.1016/j.physletb.2007.08.037 | null | astro-ph | null | Modified gravity models are subject to a number of consistency requirements
which restrict the form that the function $F(R)$ can take. We study a
particular class of $F(R)$ functions which satisfy various constraints that
have been found in the literature. These models have a late time accelerating
epoch, and an acceptable matter era. We calculate the Friedmann equation for
our models, and show that in order to satisfy the constraints we impose, they
must mimic General Relativity plus $\Lambda$ throughout the cosmic history,
with exponentially suppressed corrections. We also find that the free
parameters in our model must be fine tuned to obtain an acceptable late time
accelerating phase. We discuss the generality of this conclusion.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 15:32:59 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 13:21:10 GMT"
}
] | 2010-04-06T00:00:00 | [
[
"Appleby",
"Stephen A.",
""
],
[
"Battye",
"Richard A.",
""
]
] |
0705.3200 | Frank Reininghaus | Thomas Korb, Frank Reininghaus, Herbert Schoeller, and J\"urgen
K\"onig | Real-time renormalization group and cutoff scales in nonequilibrium
applied to an arbitrary quantum dot in the Coulomb blockade regime | 16 pages, 7 figures | Phys. Rev. B 76, 165316 (2007) | 10.1103/PhysRevB.76.165316 | null | cond-mat.str-el cond-mat.mes-hall | null | We apply the real-time renormalization group (RG) in nonequilibrium to an
arbitrary quantum dot in the Coulomb blockade regime. Within one-loop
RG-equations, we include self-consistently the kernel governing the dynamics of
the reduced density matrix of the dot. As a result, we find that relaxation and
dephasing rates generically cut off the RG flow. In addition, we include all
other cutoff scales defined by temperature, energy excitations, frequency, and
voltage. We apply the formalism to transport through single molecular magnets,
realized by the fully anisotropic Kondo model (with three different exchange
couplings J_x, J_y, and J_z) in a magnetic field h_z. We calculate the
differential conductance as function of bias voltage V and discuss a quantum
phase transition which can be tuned by changing the sign of J_x J_y J_z via the
anisotropy parameters. Finally, we calculate the noise S(Omega) at finite
frequency Omega for the isotropic Kondo model and find that the dephasing rate
determines the height of the shoulders in dS(\Omega)/d Omega near Omega=V.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 15:35:19 GMT"
},
{
"version": "v2",
"created": "Tue, 7 Aug 2007 13:38:31 GMT"
},
{
"version": "v3",
"created": "Mon, 29 Oct 2007 08:06:15 GMT"
}
] | 2007-10-29T00:00:00 | [
[
"Korb",
"Thomas",
""
],
[
"Reininghaus",
"Frank",
""
],
[
"Schoeller",
"Herbert",
""
],
[
"König",
"Jürgen",
""
]
] |
0705.3201 | Martin Rocek | Ulf Lindstrom, Martin Rocek, Itai Ryb, Rikard von Unge, Maxim Zabzine | New N = (2, 2) vector multiplets | 16 pages | JHEP 0708:008,2007 | 10.1088/1126-6708/2007/08/008 | UUITP-08/07,HIP-2007-28/TH,NORDITA-2007-15,YITP-SB-07-18 | hep-th | null | We introduce two new N = (2, 2) vector multiplets that couple naturally to
generalized Kahler geometries. We describe their kinetic actions as well as
their matter couplings both in N = (2, 2) and N = (1, 1) superspace.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:46:30 GMT"
}
] | 2009-04-17T00:00:00 | [
[
"Lindstrom",
"Ulf",
""
],
[
"Rocek",
"Martin",
""
],
[
"Ryb",
"Itai",
""
],
[
"von Unge",
"Rikard",
""
],
[
"Zabzine",
"Maxim",
""
]
] |
0705.3202 | K. Rietsch | Konstanze Rietsch | A mirror symmetric solution to the quantum Toda lattice | 25 pages, various improvements including to references, to appear in
CMP | null | null | null | math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use representation theory to construct integral formulas for solutions to
the quantum Toda lattice in general type. This result generalizes work of
Givental for SL(n)/B in a uniform way to arbitrary type and can be interpreted
as a kind of mirror theorem for the full flag variety G/B. We also prove the
existence of a totally positive critical point of the 'superpotential' in every
mirror fiber.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 15:49:20 GMT"
},
{
"version": "v2",
"created": "Mon, 27 Oct 2008 19:39:48 GMT"
},
{
"version": "v3",
"created": "Sat, 26 Mar 2011 17:50:39 GMT"
}
] | 2011-03-29T00:00:00 | [
[
"Rietsch",
"Konstanze",
""
]
] |
0705.3203 | Marco Genovese | G. Brida, N. Antonietti, M. Gramegna, L. Krivitsky, F. Piacentini,
M.L. Rastello, I. Ruo Berchera, P. Traina, M. Genovese | Recent experiments performed at "Carlo Novero" lab at INRIM on Quantum
Information and Foundations of Quantum Mechanics | Contribution to III international workshop "Recent advances in
Foundations of Quantum Mechanics and Quantum Information. In memory of Carlo
Novero" | International Journal of Quantum Information, Vol. 5, Nos. 1-2
(2007) 265-272 | null | null | quant-ph | null | In this paper we present some recent work performed at "Carlo Novero" lab on
Quantum Information and Foundations of Quantum Mechanics.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 15:09:59 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Brida",
"G.",
""
],
[
"Antonietti",
"N.",
""
],
[
"Gramegna",
"M.",
""
],
[
"Krivitsky",
"L.",
""
],
[
"Piacentini",
"F.",
""
],
[
"Rastello",
"M. L.",
""
],
[
"Berchera",
"I. Ruo",
""
],
[
"Traina",
"P.",
""
],
[
"Genovese",
"M.",
""
]
] |
0705.3204 | Rubens Ramos Viana | George Andre Pereira The, Rubens Viana Ramos, Sergio Antenor de
Carvalho | Analysis of electron localization in a coupled quantum dot structure via
variational approach: numerical results and application in quantum-dot
cellular automata | 13 pages and 9 figures | null | null | null | quant-ph | null | Analysis of quantum dot structures is a current topic with important
applications in solid-state digital logic design, quantum information
technology and quantum optics. In this work, we show a variational formulation
for the solution of the effective two-level approach of the analysis of
electron localization in two coupled quantum dots. Numerical results are
presented as well the use of electron localization in the realization of a
configurable logic circuit using quantum-dot cellular automata.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 15:57:53 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"The",
"George Andre Pereira",
""
],
[
"Ramos",
"Rubens Viana",
""
],
[
"de Carvalho",
"Sergio Antenor",
""
]
] |
0705.3205 | Sascha Z\"ollner | Christian Matthies, Sascha Z\"ollner, Hans-Dieter Meyer, and Peter
Schmelcher | Quantum dynamics of two bosons in an anharmonic trap: Collective vs
internal excitations | 8 pages, 7 figures | Phys. Rev. A 76, 023602 (2007) | 10.1103/PhysRevA.76.023602 | null | cond-mat.other | null | This work deals with the effects of an anharmonic trap on an interacting
two-boson system in one dimension. Our primary focus is on the role of the
induced coupling between the center of mass and the relative motion as both
anharmonicity and the (repulsive) interaction strength are varied. The ground
state reveals a strong localization in the relative coordinate, counteracting
the tendency to fragment for stronger repulsion. To explore the quantum
dynamics, we study the system's response upon (i) exciting the harmonic ground
state by continuously switching on an additional anharmonicity, and (ii)
displacing the center of mass, this way triggering collective oscillations. The
interplay between collective and internal dynamics materializes in the collapse
of oscillations, which are explained in terms of few-mode models.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:03:54 GMT"
}
] | 2007-08-09T00:00:00 | [
[
"Matthies",
"Christian",
""
],
[
"Zöllner",
"Sascha",
""
],
[
"Meyer",
"Hans-Dieter",
""
],
[
"Schmelcher",
"Peter",
""
]
] |
0705.3206 | Partouche Herv\'e | Costas Kounnas (Ecole Normale Superieure) and Herve Partouche (Ecole
Polytechnique) | Instanton transition in thermal and moduli deformed de Sitter cosmology | 35 pages, 10 eps figures | Nucl.Phys.B793:131-159,2008 | 10.1016/j.nuclphysb.2007.10.008 | LPTENS-07/21, CPHT-RR024.0407 | hep-th gr-qc hep-ph | null | We consider the de Sitter cosmology deformed by the presence of a thermal
bath of radiation and/or time-dependent moduli fields. Depending on the
parameters, either a first or second order phase transition can occur.
In the first case, an instanton allows a double analytic continuation. It
induces a probability to enter the inflationary evolution by tunnel effect from
another cosmological solution. The latter starts with a big bang and, in the
case the transition does not occur, ends with a big crunch. A temperature
duality exchanges the two cosmological branches. In the limit where the pure de
Sitter universe is recovered, the tunnel effect reduces to a "creation from
nothing", due to the vanishing of the big bang branch. However, the latter may
be viable in some range of the deformation parameter. In the second case, there
is a smooth evolution from a big bang to the inflationary phase.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:05:05 GMT"
},
{
"version": "v2",
"created": "Sun, 26 Aug 2007 18:34:32 GMT"
},
{
"version": "v3",
"created": "Sat, 3 Nov 2007 18:51:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kounnas",
"Costas",
"",
"Ecole Normale Superieure"
],
[
"Partouche",
"Herve",
"",
"Ecole\n Polytechnique"
]
] |
0705.3207 | Willie Merrell II | S. James Gates, Jr., Willie Merrell | D=2 N=(2,2) Semi Chiral Vector Multiplet | 15 pages | JHEP 0710:035,2007 | 10.1088/1126-6708/2007/10/035 | UMDEPP-07-002 | hep-th | null | We describe a new 1+1 dimensional N=(2,2) vector multiplet that naturally
couples to semi chiral superfields in the sense that the gauged supercovariant
derivative algebra is only consistent with imposing covariantly semi chiral
superfield constraints. It has the advantages that its prepotentials shift by
semi chiral superfields under gauge transformations. We also see that the
multiplet relates the chiral vector multiplet with the twisted chiral vector
multiplet by reducing to either multiplet under appropriate limits without
being reducible in terms of the chiral and twisted chiral vector multiplet.
This is explained from the superspace geometrical point of view as the result
of possessing a symmetry under the discrete supercoordinate transformation that
is responsible for mirror copies of supermultiplets. We then describe how to
gauge a non linear sigma model with semi chiral superfields using the
prepotentials of the new multiplet.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:15:43 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Gates,",
"S. James",
"Jr."
],
[
"Merrell",
"Willie",
""
]
] |
0705.3208 | Himadri Sekhar Das Dr. | H. S. Das and A. K. Sen | Polarimetric studies of comet Hale-Bopp | 6 pages, 2 figures, 2 Tables | null | null | null | astro-ph | null | In the present work, the non-spherical dust grain characteristics of comet
Hale-Bopp are studied using the T-matrix method and the modified power law
distribution function. It is found that the observed data fits very well with
the power index ($\alpha) = - 3$. The best fit values of complex refractive
index $(n, k)$ and the aspect ratio (E) at $\alpha = - 3$ are calculated to be
$(1.382, 0.035, 0.936)$ and $(1.379, 0.041,0.936)$ at $\lambda = 0.485 \mu m$
and $0.684\mu m$ respectively. Kerola & Larson (K-L) analysed the same comet
using the T-matrix method and the power law distribution function ($\alpha =
-3$), and found that the prolate grains can explain the observed polarization
in a more satisfactory manner as compared to the other shapes. But their
analysis could not reproduce the negative polarization branch beyond scattering
angle $157^0$. However, the results obtained from the present work successfully
generate the expected negative polarization curve beyond $157^0$ and the
fitting in this case is much better than K-L's work. So it is concluded from
the present study that the use of modified power law distribution function
(with $\alpha = - 3$) can fit the observed data in a better way, as compared to
the power law distribution function used by previous authors.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:19:56 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Das",
"H. S.",
""
],
[
"Sen",
"A. K.",
""
]
] |
0705.3209 | Matteo Murgia | P. Parma, M. Murgia, H.R. de Ruiter, R. Fanti, K.-H. Mack, and F.
Govoni | In search of dying radio sources in the local universe | 21 pages, 17 figures, accepted by A&A. For a version with high
quality figures, see http://erg.ca.astro.it/preprints/dying2007/ | null | 10.1051/0004-6361:20077592 | null | astro-ph | null | Up till now very few dying sources were known, presumably because the dying
phase is short at centimeter wavelengths. We therefore have tried to improve
the statistics on sources that have ceased to be active, or are intermittently
active. The latter sources would partly consist of a fossil radio plasma left
over from an earlier phase of activity, plus a recently restarted core and
radio jets. Improving the statistics of dying sources will give us a better
handle on the evolution of radio sources, in particular the frequency and time
scales of radio activity. We have used the WENSS and NVSS surveys, in order to
find sources with steep spectral indices, associated with nearby elliptical
galaxies. In the cross correlation we presently used only unresolved sources,
with flux densities at 1.4 GHz larger than 10 mJy. The eleven candidates thus
obtained were observed with the VLA in various configurations, in order to
confirm the steepness of the spectra, and to check whether active structures
like flat-spectrum cores and jets are present, perhaps at low levels. We
estimated the duration of the active and relic phases by modelling the
integrated radio spectra using the standard models of spectral evolution. We
have found six dying sources and three restarted sources, while the remaining
two candidates remain unresolved also with the new VLA data and may be Compact
Steep Spectrum sources, with an unusually steep spectrum. The typical age of
the active phase, as derived by spectral fits, is in the range 10^7 - 10^8
years. For our sample of dying sources, the age of the relic phase is on
average shorter by an order of magnitude than the active phase.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:24:04 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Parma",
"P.",
""
],
[
"Murgia",
"M.",
""
],
[
"de Ruiter",
"H. R.",
""
],
[
"Fanti",
"R.",
""
],
[
"Mack",
"K. -H.",
""
],
[
"Govoni",
"F.",
""
]
] |
0705.3210 | Solange Odile Saliu | C. Bizdadea, E. M. Cioroianu, D. Cornea, E. Diaconu, S. O. Saliu, S.
C. Sararu | Interactions for a collection of spin-two fields intermediated by a
massless p-form | LaTeX; the content of v2 has been changed, some former results have
been changed, new material has been added; accepted for publication in
Nuclear Physics B | Nucl.Phys.B794:442-494,2008 | 10.1016/j.nuclphysb.2007.10.007 | null | hep-th | null | Under the general hypotheses of locality, smoothness of interactions in the
coupling constant, Poincare invariance, Lorentz covariance, and preservation of
the number of derivatives on each field, we investigate the cross-couplings of
one or several spin-two fields to a massless p-form. Two complementary cases
arise. The first case is related to the standard interactions from General
Relativity, but the second case describes a new, special type of couplings in
D=p+2 spacetime dimensions, which break the PT-invariance. Nevertheless, no
consistent, indirect cross-interactions among different gravitons with a
positively defined metric in internal space can be constructed.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:24:16 GMT"
},
{
"version": "v2",
"created": "Sun, 28 Oct 2007 11:21:58 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Bizdadea",
"C.",
""
],
[
"Cioroianu",
"E. M.",
""
],
[
"Cornea",
"D.",
""
],
[
"Diaconu",
"E.",
""
],
[
"Saliu",
"S. O.",
""
],
[
"Sararu",
"S. C.",
""
]
] |
0705.3211 | Gregory V. Morozov | C. P. Dettmann, G. V. Morozov, M. Sieber, H. Waalkens | Directional Emission from an Optical Microdisk Resonator with a Point
Scatterer | 4 pages, 7 figures, pdflatex | null | 10.1209/0295-5075/82/34002 | null | physics.optics | null | We present a new design of dielectric microcavities supporting modes with
large quality factors and highly directional light emission. The key idea is to
place a point scatterer inside a dielectric circular microdisk. We show that,
depending on the position and strength of the scatterer, this leads to strongly
directional modes in various frequency regions while preserving the high
Q-factors reminiscent of the whispering gallery modes of the microdisk without
scatterer. The design is very appealing due to its simplicity, promising a
cleaner experimental realisation than previously studied microcavity designs on
the one hand and analytic tractability based on Green's function techniques and
self-adjoint extension theory on the other.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:41:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Dettmann",
"C. P.",
""
],
[
"Morozov",
"G. V.",
""
],
[
"Sieber",
"M.",
""
],
[
"Waalkens",
"H.",
""
]
] |
0705.3212 | Douglas Hoover | C.P. Burgess, D. Hoover, G. Tasinato | UV Caps and Modulus Stabilization for 6D Gauged Chiral Supergravity | 34 pages. Typos corrected, references added. Matches published
version | JHEP 0709:124,2007 | 10.1088/1126-6708/2007/09/124 | null | hep-th | null | We describe an explicit UV regularization of the brane singularities for all
4D flat configurations of 6D gauged chiral supergravity compactified on axially
symmetric internal spaces (for which the general solutions are known). All such
solutions have two or fewer co-dimension two singularities, which we resolve in
terms of microscopic co-dimension one cylindrical 4-branes, whose interiors are
capped using the most general possible 4D flat solution of the 6D field
equations. By so doing we show that such a cap is always possible for any given
bulk geometry, and obtain an explicit relationship between the properties of
the capped 4-branes and the various parameters which describe the bulk
solution. We show how these branes generically stabilize the size of the extra
dimensions by breaking the scale invariance which relates classical solutions
to 6D supergravity, and we compute the scalar potential for this modulus in the
4D effective theory. The lifting of this marginal direction provides a natural
realization of the Goldberger-Wise stabilization mechanism in six dimensions.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:43:04 GMT"
},
{
"version": "v2",
"created": "Tue, 25 Sep 2007 00:18:03 GMT"
}
] | 2010-05-12T00:00:00 | [
[
"Burgess",
"C. P.",
""
],
[
"Hoover",
"D.",
""
],
[
"Tasinato",
"G.",
""
]
] |
0705.3213 | Nitin Samarth | G. Xiang and N. Samarth | The Influence of Magnetic Domain Walls on Longitudinal and Transverse
Magnetoresistance in Tensile Strained (Ga,Mn)As Epilayers | null | Phys. Rev. B 76, 054440 (2007) | 10.1103/PhysRevB.76.054440 | null | cond-mat.mtrl-sci | null | We present a theoretical analysis of recent experimental measurements of
magnetoresistance in (Ga,Mn)As epilayers with perpendicular magnetic
anisotropy. The model reproduces the field-antisymmetric anomalies observed in
the longitudinal magnetoresistance in the planar geometry (magnetic field in
the epilayer plane and parallel to the current density), as well as the unusual
shape of the accompanying transverse magnetoresistance. The magnetoresistance
characteristics are attributed to circulating currents created by the presence
of magnetic domain walls.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 16:44:38 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Xiang",
"G.",
""
],
[
"Samarth",
"N.",
""
]
] |
0705.3214 | Sven Jahnke | Sven Jahnke, Raoul-Martin Memmesheimer, Marc Timme | Stable Irregular Dynamics in Complex Neural Networks | 10 pages, 2 figures | null | 10.1103/PhysRevLett.100.048102 | null | cond-mat.dis-nn | null | For infinitely large sparse networks of spiking neurons mean field theory
shows that a balanced state of highly irregular activity arises under various
conditions. Here we analytically investigate the microscopic irregular dynamics
in finite networks of arbitrary connectivity, keeping track of all individual
spike times. For delayed, purely inhibitory interactions we demonstrate that
the irregular dynamics is not chaotic but rather stable and convergent towards
periodic orbits. Moreover, every generic periodic orbit of these dynamical
systems is stable. These results highlight that chaotic and stable dynamics are
equally capable of generating irregular activity.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:02:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jahnke",
"Sven",
""
],
[
"Memmesheimer",
"Raoul-Martin",
""
],
[
"Timme",
"Marc",
""
]
] |
0705.3215 | Ruben Sanchez-Garcia | Ben D. MacArthur, Rub\'en J. S\'anchez-Garc\'ia and James W. Anderson | On Automorphism Groups of Networks | 10 pages, 2 figures, major changes, abridged version | Discrete Appl. Math. 156 (2008), no. 18, 3525-3531. | 10.1016/j.dam.2008.04.008 | null | physics.soc-ph math.CO | null | We consider the size and structure of the automorphism groups of a variety of
empirical `real-world' networks and find that, in contrast to classical random
graph models, many real-world networks are richly symmetric. We relate
automorphism group structure to network topology and discuss generic forms of
symmetry and their origin in real-world networks.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:20:07 GMT"
},
{
"version": "v2",
"created": "Fri, 21 Sep 2007 15:29:23 GMT"
}
] | 2020-08-05T00:00:00 | [
[
"MacArthur",
"Ben D.",
""
],
[
"Sánchez-García",
"Rubén J.",
""
],
[
"Anderson",
"James W.",
""
]
] |
0705.3216 | Juan Almendral | Juan A. Almendral and Albert D\'iaz-Guilera | Dynamical and spectral properties of complex networks | 14 pages, 5 figures, to be published in New Journal of Physics | null | 10.1088/1367-2630/9/6/187 | null | nlin.AO | null | Dynamical properties of complex networks are related to the spectral
properties of the Laplacian matrix that describes the pattern of connectivity
of the network. In particular we compute the synchronization time for different
types of networks and different dynamics. We show that the main dependence of
the synchronization time is on the smallest nonzero eigenvalue of the Laplacian
matrix, in contrast to other proposals in terms of the spectrum of the
adjacency matrix. Then, this topological property becomes the most relevant for
the dynamics.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:04:34 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Almendral",
"Juan A.",
""
],
[
"Díaz-Guilera",
"Albert",
""
]
] |
0705.3217 | Petr Marek | Petr Marek, M. S. Kim and Jinhyoung Lee | Nonclassicality in phase space and nonclassical correlation | 5 pages, 4 figures, replaced by the published version | Phys. Rev. A 79, 052315 (2009) | null | null | quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuous variable entanglement is a manifestation of nonclassicality of
quantum states. In this paper we attempt to analyze whether and under which
conditions nonclassicality can be used as an entanglement criterion. We adopt
the well-accepted definition of nonclassicality in the form of lack of
well-defined positive Glauber Sudarshan P-function describing the state. After
demonstrating that the classicality of subsystems is not sufficient for the
nonclassicality of the overall state to be identifiable with entanglement, we
focus on Gaussian states and find specific local unitary transformations
required to arrive at this equivalency. This is followed by the analysis of
quantitative relation between nonclassicality and entanglement.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:08:07 GMT"
},
{
"version": "v2",
"created": "Fri, 3 Oct 2008 13:37:19 GMT"
},
{
"version": "v3",
"created": "Fri, 15 May 2009 07:50:09 GMT"
}
] | 2009-05-15T00:00:00 | [
[
"Marek",
"Petr",
""
],
[
"Kim",
"M. S.",
""
],
[
"Lee",
"Jinhyoung",
""
]
] |
0705.3218 | Jeffrey Buboltz | Jeffrey T. Buboltz, Charles Bwalya, Santiago Reyes, Dobromir Kamburov | Stern-Volmer Modeling of Steady-State Forster Energy Transfer Between
Dilute, Freely Diffusing Membrane-Bound Fluorophores | 6 pages, 4 figures, submitted to J Chem Phys | null | 10.1063/1.2800564 | null | physics.chem-ph physics.bio-ph | null | Two different metrics are used to assess Forster resonance energy transfer
(FRET) between fluorophores in the steady state: (1) acceptor-quenching of
donor fluorescence, E (a.k.a. transfer efficiency); and (ii) donor-excited
acceptor fluorescence, F-A-Dex. While E is still more widely used, F-A-Dex has
been gaining in popularity for practical reasons among experimentalists who
study biomembranes. Here, for the special case of membrane-bound fluorophores,
we present a substantial body of experimental evidence that justifies the use
of simple Stern-Volmer expressions when modeling either FRET metric under
dilute-probe conditions. We have also discovered a dilute-regime correspondence
between our Stern-Volmer expression for E and Wolber and Hudson's series
approximation for steady-state Forster quenching in 2D. This novel
correspondence allows us to interpret each of our 2D quenching constants in
terms of both (i) an effective Forster distance, and (ii) two maximum
acceptor-concentration limits, each of which defines its own useful
experimental regime. Taken together, our results suggest a three-step strategy
toward designing more effective steady-state FRET experiments for the study of
biomembranes.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:12:56 GMT"
},
{
"version": "v2",
"created": "Sun, 19 Aug 2007 19:47:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Buboltz",
"Jeffrey T.",
""
],
[
"Bwalya",
"Charles",
""
],
[
"Reyes",
"Santiago",
""
],
[
"Kamburov",
"Dobromir",
""
]
] |
0705.3219 | Fathi Namouni | Fathi Namouni and Massimiliano Guzzo | The Accelerated Kepler Problem | 16 pages, 9 figures, in press at Celestial Mechanics and Dynamical
Astronomy | null | 10.1007/s10569-007-9087-4 | null | astro-ph | null | The accelerated Kepler problem is obtained by adding a constant acceleration
to the classical two-body Kepler problem. This setting models the dynamics of a
jet-sustaining accretion disk and its content of forming planets as the disk
loses linear momentum through the asymmetric jet-counterjet system it powers.
The dynamics of the accelerated Kepler problem is analyzed using physical as
well as parabolic coordinates. The latter naturally separate the problem's
Hamiltonian into two unidimensional Hamiltonians. In particular, we identify
the origin of the secular resonance in the accelerated Kepler problem and
determine analytically the radius of stability boundary of initially circular
orbits that are of particular interest to the problem of radial migration in
binary systems as well as to the truncation of accretion disks through stellar
jet acceleration.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:13:40 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Namouni",
"Fathi",
""
],
[
"Guzzo",
"Massimiliano",
""
]
] |
0705.3220 | Julian Oberdisse | Julian Oberdisse (LCVN), Peter Hine, Wim Pyckhout-Hintzen (IFF) | Structure of interacting aggregates of silica nanoparticles in a polymer
matrix: Small-angle scattering and Reverse Monte-Carlo simulations | null | Soft Matter 3 (07/04/2007) 476-485 | 10.1039/b614957j | null | cond-mat.soft | null | Reinforcement of elastomers by colloidal nanoparticles is an important
application where microstructure needs to be understood - and if possible
controlled - if one wishes to tune macroscopic mechanical properties. Here the
three-dimensional structure of big aggregates of nanometric silica particles
embedded in a soft polymeric matrix is determined by Small Angle Neutron
Scattering. Experimentally, the crowded environment leading to strong
reinforcement induces a strong interaction between aggregates, which generates
a prominent interaction peak in the scattering. We propose to analyze the total
signal by means of a decomposition in a classical colloidal structure factor
describing aggregate interaction and an aggregate form factor determined by a
Reverse Monte Carlo technique. The result gives new insights in the shape of
aggregates and their complex interaction in elastomers. For comparison, fractal
models for aggregate scattering are also discussed.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:18:38 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Oberdisse",
"Julian",
"",
"LCVN"
],
[
"Hine",
"Peter",
"",
"IFF"
],
[
"Pyckhout-Hintzen",
"Wim",
"",
"IFF"
]
] |
0705.3221 | Joern Kersten | Joern Kersten, Alexei Yu. Smirnov | Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass
Generation | v2: 23 pages, minor clarifications, references updated, version to
appear in PRD | Phys.Rev.D76:073005,2007 | 10.1103/PhysRevD.76.073005 | null | hep-ph hep-ex | null | We consider the possibility to detect right-handed neutrinos, which are
mostly singlets of the Standard Model gauge group, at future accelerators.
Substantial mixing of these neutrinos with the active neutrinos requires a
cancellation of different contributions to the light neutrino mass matrix at
the level of 10^{-8}. We discuss possible symmetries behind this cancellation
and argue that they always lead to conservation of total lepton number. Light
neutrino masses can be generated by small perturbations violating these
symmetries. In the most general case, LHC physics and the mechanism of neutrino
mass generation are essentially decoupled; with additional assumptions,
correlations can appear between collider observables and features of the
neutrino mass matrix.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:19:08 GMT"
},
{
"version": "v2",
"created": "Fri, 14 Sep 2007 13:19:49 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Kersten",
"Joern",
""
],
[
"Smirnov",
"Alexei Yu.",
""
]
] |
0705.3222 | George Phillies | George D. J. Phillies (Worcester Polytechnic Institute, Worcester MA) | Optical Probe Diffusion in Polymer Solutions | 57 pages, 82 figures, LaTeX + RevTex4 Phys Rev B style, uses amsmath
graphicx latexsym amsfonts amssymb bm longtable | null | null | null | cond-mat.soft | null | The experimental literature on the motion of mesoscopic probe particles
through polymer solutions is systematically reviewed. The primary focus is the
study of diffusive motion of small probe particles. Comparison is made with
measurements of solution viscosities. A coherent description was obtained,
namely that the probe diffusion coefficient generally depends on polymer
concentration as D_p = D_0 exp(-alpha c^nu). One finds that alpha depends on
polymer molecular weights as alpha ~ M^0.8, and \nu appears to have large-M and
small-M values with a crossover linking them. The probe diffusion coefficient
does not simply track the solution viscosity; instead, D_p eta typically
increases markedly with increasing polymer concentration and molecular weight.
In some systems, e.g., hydroxypropylcellulose:water, the observed probe spectra
are bi- or tri-modal. Extended analysis of the full probe phenomenology implies
that hydroxypropylcellulose solutions are characterized by a single,
concentration-independent, length scale that is approximately the size of a
polymer coil. In a very few systems, one sees re-entrant or
low-concentration-plateau behaviors of uncertain interpretation; from their
rarity, these behaviors are reasonably interpreted as corresponding to specific
chemical effects. True microrheological studies examining the motion of
mesoscopic particles under the influence of a known external force are also
examined. Viscosity from true microrheological measurements is in many cases
substantially smaller than the viscosity measured with a macroscopic
instrument.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 15:45:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Phillies",
"George D. J.",
"",
"Worcester Polytechnic Institute, Worcester MA"
]
] |
0705.3223 | John Chambers | John E. Chambers | N-body integrators for planets in binary star systems | 21 pages plus 2 figures. Chapter to appear in the book "Planets in
Binary Star Systems," ed. Nader Haghighipour (Springer publishing company),
2007 | null | null | null | astro-ph | null | Symplectic integrators are the tool of choice for many researchers studying
dynamical systems because of their good long-term energy conservation
properties. For systems with a dominant central mass, symplectic integrators
are also highly efficient. In this chapter, I describe the theory of symplectic
integrators in terms of Lie series. I show how conventional symplectic
algorithms have been adapted for use in binary-star systems to study problems
such as the dynamical stability of multi-planet systems and the accretion of
planets from planetesimals. This is achieved by devising new coordinate systems
for the wide-binary and close-binary cases separately. I show how the
performance of these algorithms can be improved at little extra cost using
symplectic correctors. Finally, I discuss drawbacks of these algorithms, in
particular in dealing with close encounters with one or both members of the
binary, and the prospects for overcoming these problems.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:28:24 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Chambers",
"John E.",
""
]
] |
0705.3224 | Pedro Lind | Pedro G. Lind, Luciano R. da Silva, Jos\'e S. Andrade Jr., Hans J.
Herrmann | Spreading gossip in social networks | 10 pages, 16 figures, Revtex; Virt.J. of Biol. Phys., Oct.1 2007 | Phys. Rev. E 76, 036117 (2007) | 10.1103/PhysRevE.76.036117 | null | physics.soc-ph | null | We study a simple model of information propagation in social networks, where
two quantities are introduced: the spread factor, which measures the average
maximal fraction of neighbors of a given node that interchange information
among each other, and the spreading time needed for the information to reach
such fraction of nodes. When the information refers to a particular node at
which both quantities are measured, the model can be taken as a model for
gossip propagation. In this context, we apply the model to real empirical
networks of social acquaintances and compare the underlying spreading dynamics
with different types of scale-free and small-world networks. We find that the
number of friendship connections strongly influences the probability of being
gossiped. Finally, we discuss how the spread factor is able to be applied to
other situations.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:30:53 GMT"
}
] | 2011-03-22T00:00:00 | [
[
"Lind",
"Pedro G.",
""
],
[
"da Silva",
"Luciano R.",
""
],
[
"Andrade",
"José S.",
"Jr."
],
[
"Herrmann",
"Hans J.",
""
]
] |
0705.3225 | Oleg Smirnov | O. Ju. Smirnov | An approximation of the ideal scintillation detector line shape with a
generalized gamma distribution | 26 pages, 8 figures, 2 tables | Nucl.Instrum.Meth.A595:410-418,2008 | 10.1016/j.nima.2008.07.139 | null | physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An approximation of the real line shape of a scintillation detector with a
generalized gamma distribution is proposed. The approximation describes the
ideal scintillation line shape better than the conventional normal
distribution. Two parameters of the proposed function are uniquely defined by
the first two moments of the detector response.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:46:44 GMT"
},
{
"version": "v2",
"created": "Thu, 28 Jun 2007 22:33:49 GMT"
},
{
"version": "v3",
"created": "Thu, 12 Jun 2008 18:31:47 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Smirnov",
"O. Ju.",
""
]
] |
0705.3226 | Stijn Bruers Mr | Stijn Bruers | A discussion on maximum entropy production and information theory | 12 pages, no figures | null | 10.1088/1751-8113/40/27/003 | null | cond-mat.stat-mech | null | We will discuss the maximum entropy production (MaxEP) principle based on
Jaynes' information theoretical arguments, as was done by Dewar (2003, 2005).
With the help of a simple mathematical model of a non-equilibrium system, we
will show how to derive minimum and maximum entropy production. Furthermore,
the model will help us to clarify some confusing points and to see differences
between some MaxEP studies in the literature.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:47:20 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Bruers",
"Stijn",
""
]
] |
0705.3227 | H. Reiju Mihara | Masahiro Kumabe, H. Reiju Mihara | Computability of simple games: A characterization and application to the
core | 35 pages; To appear in Journal of Mathematical Economics; Appendix
added, Propositions, Remarks, etc. are renumbered | Journal of Mathematical Economics, Volume 44, Issues 3-4, February
2008, Pages 348-366 | 10.1016/j.jmateco.2007.05.012 | null | cs.GT cs.CC cs.LO math.LO | null | The class of algorithmically computable simple games (i) includes the class
of games that have finite carriers and (ii) is included in the class of games
that have finite winning coalitions. This paper characterizes computable games,
strengthens the earlier result that computable games violate anonymity, and
gives examples showing that the above inclusions are strict. It also extends
Nakamura's theorem about the nonemptyness of the core and shows that computable
games have a finite Nakamura number, implying that the number of alternatives
that the players can deal with rationally is restricted.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:49:15 GMT"
},
{
"version": "v2",
"created": "Wed, 8 Aug 2007 13:57:59 GMT"
}
] | 2011-11-09T00:00:00 | [
[
"Kumabe",
"Masahiro",
""
],
[
"Mihara",
"H. Reiju",
""
]
] |
0705.3228 | William Cochran | William D. Cochran, Michael Endl, Robert A. Wittenmyer and Jacob L.
Bean | A Planetary System Around HD 155358: The Lowest Metallicity Planet Host
Star | 8 pages, 3 figures. Astrophysical Journal in press, 1 September 2007
issue | Astrophys.J.665:1407-1412,2007 | 10.1086/519555 | null | astro-ph | null | We report the detection of two planetary mass companions to the solar-type
star HD 155358. The two planets have orbital periods of 195.0 and 530.3 days,
with eccentricities of 0.11 and 0.18. The minimum masses for these planets are
0.89 and 0.50 Jupiter masses respectively. The orbits are close enough to each
other, and the planets are sufficiently massive, that the planets are
gravitationally interacting with each other, with their eccentricities and
arguments of periastron varying with periods of 2300--2700 years. While large
uncertainties remain in the orbital eccentricities, our orbital integration
calculations indicate that our derived orbits would be dynamically stable for
at least 10^8 years. With a metallicity [Fe/H] of -0.68, HD 155358 is tied with
the K1III giant planet host star HD 47536 for the lowest metallicity of any
planet host star yet found. Thus, a star with only 21% of the heavy-element
content of our Sun was still able to form a system of at least two Jovian-mass
planets and have their orbits evolve to semi-major axes of 0.6-1.2 AU.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:56:05 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Cochran",
"William D.",
""
],
[
"Endl",
"Michael",
""
],
[
"Wittenmyer",
"Robert A.",
""
],
[
"Bean",
"Jacob L.",
""
]
] |
0705.3229 | Mark Williams | D0 Collaboration, V. Abazov, et al | Observation and Properties of L=1 B_1 and B_2* Mesons | 8 pages, 2 figures. Submitted to Phys. Rev. Lett | Phys.Rev.Lett.99:172001,2007 | 10.1103/PhysRevLett.99.172001 | FERMILAB-PUB-07/130-E | hep-ex | null | Excited B mesons B_1 and B_2* are observed directly for the first time as two
separate states in fully reconstructed decays to B+(*) pi-. The mass of B_1 is
measured to be (5720.6 +- 2.4 +- 1.4) MeV/c^2 and the mass difference DeltaM
between B_2* and B_1 is (26.2 +- 3.1 +- 0.9) MeV/c^2, giving the mass of the
B_2* as (5746.8 +- 2.4 +- 1.7) MeV/c^2. The production rate for B_1 and B_2*
mesons is determined to be a fraction (13.9 +- 1.9 +- 3.2)% of the production
rate of the B+ meson.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 17:56:27 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"D0 Collaboration",
"",
""
],
[
"Abazov",
"V.",
""
]
] |
0705.3230 | Adam K. Leibovich | Adam K Leibovich and Xiaohui Liu | The color-singlet contribution to e^+ e^- ->J/psi + X at the endpoint | 17 pages, 7 figures | Phys.Rev.D76:034005,2007 | 10.1103/PhysRevD.76.034005 | null | hep-ph | null | Recent observations of the J/psi spectrum produced in e^+e^- collisions at
the Upsilon(4S) resonance are in conflict with fixed-order calculations using
Non-Relativsitic QCD effective theory (NRQCD). One problem is an enhancement in
the cross section when the J/psi has maximal energy, due to large perturbative
corrections (Sudakov logarithms). In a recent paper, the Sudakov logarithms in
the color-octet contribution were summed by combining NRQCD with the
Soft-Collinear Effective Theory. However to be consistent, the color-singlet
contributions must also be summed in the endpoint region which was not done in
that paper. In this paper, we sum the leading and next-to-leading logarithms in
the color-singlet contribution to the J/psi production cross section. We find
that the color-singlet cross section is suppressed near endpoint compared to
the fixed order NRQCD prediction.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:31:26 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Leibovich",
"Adam K",
""
],
[
"Liu",
"Xiaohui",
""
]
] |
0705.3231 | J. Scott Carter | J. Scott Carter (Univ. of South Alabama), Alissa S. Crans (Loyola
Marymount Univ.), Mohamed Elhamdadi (Univ. of South Florida), Masahico Saito
(Univ. of South Florida) | Cohomology of the adjoint of Hopf algebras | 23 pages, 22 figures, cool stuff | null | null | null | math.QA math.GT | null | A cohomology theory of the adjoint of Hopf algebras, via deformations, is
presented by means of diagrammatic techniques. Explicit calculations are
provided in the cases of group algebras, function algebras on groups, and the
bosonization of the super line. As applications, solutions to the YBE are given
and quandle cocycles are constructed from groupoid cocycles.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 18:16:02 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Carter",
"J. Scott",
"",
"Univ. of South Alabama"
],
[
"Crans",
"Alissa S.",
"",
"Loyola\n Marymount Univ."
],
[
"Elhamdadi",
"Mohamed",
"",
"Univ. of South Florida"
],
[
"Saito",
"Masahico",
"",
"Univ. of South Florida"
]
] |
0705.3232 | Kwan-Woo Lee | K.-W. Lee and W. E. Pickett | Chemical Differences between K and Na in Alkali Cobaltates | 5 papers | Phys. Rev. B 76, 134510 (2007) | 10.1103/PhysRevB.76.134510 | null | cond-mat.str-el cond-mat.supr-con | null | K$_x$CoO$_2$ shares many similarities with Na$_x$CoO$_2$, as well as some
important differences (no hydration-induced superconductivity has been
reported). At $T_{c2}$=20 K, K$_{0.5}$CoO$_2$ becomes an insulator with a tiny
optical gap as happens in Na$_{0.5}$CoO$_2$ at 52 K. This similarity, with a
known common structure, enables direct comparisons to be made. Using the
K-zigzag structure recently reported and the local density approximation, we
compare and contrast these cobaltates at x=0.5. Although the electronic
structures are quite similar as expected, substantial differences are observed
near the Fermi level. These differences are found to be attributable mostly to
the chemical, rather than structural difference: although Na is normally
considered to be fully ion, K has somewhat more highly ionic character than
does Na in these cobaltates.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 18:36:28 GMT"
}
] | 2007-10-20T00:00:00 | [
[
"Lee",
"K. -W.",
""
],
[
"Pickett",
"W. E.",
""
]
] |
0705.3233 | Edward Mosteig | Curtis D. Bennett, Edward Mosteig | On the Collection of Integers that Index the Fixed Points of Maps on the
Space of Rational Functions | null | null | null | null | math.NT | null | Given integers s and t, define a function phi_{s,t} on the space of all
formal complex series expansions by phi_{s,t} (sum a_n x^n) = sum a_{sn+t} x^n.
We define an integer r to be distinguished with respect to (s,t) if r and s are
relatively prime and and r divides t (1 + s + ... s^{ord_r(s)-1}). The vector
space consisting of all rational functions whose Taylor expansions at zero are
fixed by phi_{s,t} was previously classified by constructing a basis that is
partially indexed by integers that are distinguished with respect to the pair
(s,t). In this paper, we study the properties of the set of distinguished
integers with respect to (s,t). In particular, we demonstrate that the set of
distinguished integers with respect to (s,t) can be written as a union of
infinitely many arithmetic progressions. In addition, we construct another
generating set for the collection of rational functions that are fixed by
phi_{s,t} and discuss the relationship between this generating set and the
basis that was generated previously.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 18:45:27 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bennett",
"Curtis D.",
""
],
[
"Mosteig",
"Edward",
""
]
] |
0705.3234 | Roberto Onofrio | M. Brown-Hayes, Q. Wei, W.-J. Kim, and R. Onofrio | Development of an apparatus for cooling 6Li-87Rb Fermi-Bose mixtures in
a light-assisted magnetic trap | Presented at LPHYS'06, 8 figures | Laser Physics 17 (2007) pp. 514-522 | 10.1134/S1054660X07040330 | null | physics.atom-ph cond-mat.str-el physics.optics | null | We describe an experimental setup designed to produce ultracold trapped gas
clouds of fermionic 6Li and bosonic 87Rb. This combination of alkali metals has
the potential to reach deeper Fermi degeneracy with respect to other mixtures
since it allows for improved heat capacity matching which optimizes sympathetic
cooling efficiency. Atomic beams of the two species are independently produced
and then decelerated by Zeeman slowers. The slowed atoms are collected into a
magneto-optical trap and then transferred into a quadrupole magnetic trap. An
ultracold Fermi gas with temperature in the 10^-3 T_F range should be
attainable through selective confinement of the two species via a properly
detuned laser beam focused in the center of the magnetic trap.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:02:10 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Brown-Hayes",
"M.",
""
],
[
"Wei",
"Q.",
""
],
[
"Kim",
"W. -J.",
""
],
[
"Onofrio",
"R.",
""
]
] |
0705.3235 | Mateusz Ruszkowski | M. Ruszkowski (1), T.A. Ensslin (1), M. Bruggen (2), M.C. Begelman
(3), E. Churazov (1) ((1) MPA, (2) Jacobs University, (3) JILA) | Cosmic ray confinement in fossil cluster bubbles | submitted | null | 10.1111/j.1365-2966.2007.12659.x | null | astro-ph | null | Most cool core clusters of galaxies possess active galactic nuclei (AGN) in
their centers. These AGN inflate buoyant bubbles containing non-thermal radio
emitting particles. If such bubbles efficiently confine cosmic rays (CR) then
this could explain ``radio ghosts'' seen far from cluster centers. We simulate
the diffusion of cosmic rays from buoyant bubbles inflated by AGN. Our
simulations include the effects of the anisotropic particle diffusion
introduced by magnetic fields. Our models are consistent with the X-ray
morphology of AGN bubbles, with disruption being suppressed by the magnetic
draping effect. We conclude that for such magnetic field topologies, a
substantial fraction of cosmic rays can be confined inside the bubbles on
buoyant rise timescales even when the parallel diffusivity coefficient is very
large. For isotropic diffusion at a comparable level, cosmic rays would leak
out of the bubbles too rapidly to be consistent with radio observations. Thus,
the long confinement times associated with the magnetic suppression of CR
diffusion can explain the presence of radio ghosts. We show that the partial
escape of cosmic rays is mostly confined to the wake of the rising bubbles, and
speculate that this effect could: (1) account for the excitation of the
H$\alpha$ filaments trailing behind the bubbles in the Perseus cluster, (2)
inject entropy into the metal enriched material being lifted by the bubbles
and, thus, help to displace it permanently from the cluster center and (3)
produce observable $\gamma$-rays via the interaction of the diffusing cosmic
rays with the thermal intracluster medium (ICM).
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:17:17 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Ruszkowski",
"M.",
"",
"MPA"
],
[
"Ensslin",
"T. A.",
"",
"MPA"
],
[
"Bruggen",
"M.",
"",
"Jacobs University"
],
[
"Begelman",
"M. C.",
"",
"JILA"
],
[
"Churazov",
"E.",
"",
"MPA"
]
] |
0705.3236 | Nikolai Iorgov | N.Z. Iorgov, V.N. Shadura, Yu.V. Tykhyy | Eigenvectors of Baxter-Bazhanov-Stroganov \tau^{(2)}(t_q) model with
fixed-spin boundary conditions | 14 pages, paper submitted to Proceedings of the International
Workshop "Classical and Quantum Integrable Systems" (Dubna, January, 2007) | Theoretical and Mathematical Physics, 155(1): 585-597 (2008) | 10.1007/s11232-008-0048-1 | null | nlin.SI cond-mat.stat-mech math-ph math.MP | null | The aim of this contribution is to give the explicit formulas for the
eigenvectors of the transfer-matrix of Baxter-Bazhanov-Stroganov (BBS) model
(N-state spin model) with fixed-spin boundary conditions. These formulas are
obtained by a limiting procedure from the formulas for the eigenvectors of
periodic BBS model. The latter formulas were derived in the framework of the
Sklyanin's method of separation of variables. In the case of fixed-spin
boundaries the corresponding T-Q Baxter equations for the functions of
separated variables are solved explicitly. As a particular case we obtain the
eigenvectors of the Hamiltonian of Ising-like Z_N quantum chain model.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:19:46 GMT"
},
{
"version": "v2",
"created": "Wed, 12 Sep 2007 16:12:50 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Iorgov",
"N. Z.",
""
],
[
"Shadura",
"V. N.",
""
],
[
"Tykhyy",
"Yu. V.",
""
]
] |
0705.3237 | Alvaro de Souza Dutra | Alvaro de Souza Dutra (UNESP/Campus de Guaratingueta) | Deformed solitons: The case of two coupled scalar fields | Work presented as a talk in XI International Conference on Symmetry
Methods in Physics (SYMPHYS-11)held in Prague, the Czech Republic, from 21 to
24 June 2004. This work is also available from the link:
http://www.jinr.dubna.su/publish/Proceedings/Burdik-2004/index.html | null | null | null | hep-th | null | In this work, we present a general procedure, which is able to generate new
exact solitonic models in 1+1 dimensions, from a known one, consisting of two
coupled scalar fields. An interesting consequence of the method, is that of the
appearing of nontrivial extensions, where the deformed systems presents other
BPS solitons than that appearing in the original model. Finally we take a
particular example, in order to check the above mentioned features.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:12:19 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Dutra",
"Alvaro de Souza",
"",
"UNESP/Campus de Guaratingueta"
]
] |
0705.3238 | Brant M. Johnson | PHENIX Collaboration, A. Adare, et al | Transverse momentum and centrality dependence of dihadron correlations
in Au+Au collisions at sqrt(s_NN)=200 GeV: Jet-quenching and the response of
partonic matter | 420 authors from 58 institutions, 6 pages, 4 figures. Submitted to
Physical Review Letters. Plain text data tables for the points plotted in
figures for this and previous PHENIX publications are (or will be) publicly
available at http://www.phenix.bnl.gov/papers.html | Phys.Rev.C77:011901,2008 | 10.1103/PhysRevC.77.011901 | null | nucl-ex | null | Azimuthal angle \Delta\phi correlations are presented for charged hadrons
from dijets for 0.4 < p_T < 10 GeV/c in Au+Au collisions at sqrt(s_NN) = 200
GeV. With increasing p_T, the away-side distribution evolves from a broad to a
concave shape, then to a convex shape. Comparisons to p+p data suggest that the
away-side can be divided into a partially suppressed "head" region centered at
Delta\phi ~ \pi, and an enhanced "shoulder" region centered at Delta\phi ~ \pi
+/- 1.1. The p_T spectrum for the "head" region softens toward central
collisions, consistent with the onset of jet quenching. The spectral slope for
the "shoulder" region is independent of centrality and trigger p_T, which
offers constraints on energy transport mechanisms and suggests that the
"shoulder" region contains the medium response to energetic jets.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:17:00 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"PHENIX Collaboration",
"",
""
],
[
"Adare",
"A.",
""
]
] |
0705.3239 | Michael Fuhrer | Sungjae Cho and Michael S. Fuhrer | Charge Transport and Inhomogeneity near the Charge Neutrality Point in
Graphene | null | null | 10.1103/PhysRevB.77.081402 | null | cond-mat.mes-hall | null | The magnetic field-dependent longitudinal and Hall components of the
resistivity rho_xx(H) and rho_xy(H) are measured in graphene on silicon dioxide
substrates at temperatures from 1.6 K to room temperature. At charge densities
near the charge-neutrality point rho_xx(H) is strongly enhanced and rho_xy(H)
is suppressed, indicating nearly equal electron and hole contributions to the
transport current. The data are inconsistent with uniformly distributed
electron and hole concentrations (two-fluid model) but in excellent agreement
with the recent theoretical prediction for inhomogeneously distributed electron
and hole regions of equal mobility. At low temperatures and high magnetic
fields rho_xx(H) saturates to a value ~h/e^2, with Hall conductivity << e^2/h,
which may indicate a regime of localized v = 2 and v = -2 quantum Hall puddles.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:34:52 GMT"
},
{
"version": "v2",
"created": "Tue, 22 May 2007 21:08:16 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Cho",
"Sungjae",
""
],
[
"Fuhrer",
"Michael S.",
""
]
] |
0705.3240 | Rahul Shetty | Rahul Shetty, Stuart N. Vogel, Eve C. Ostriker, and Peter J. Teuben | Kinematics of Spiral Arm Streaming in M51 | 50 pages, including 20 figures; Accepted for publication in ApJ. PDF
version with high resolution figures available at
http://www.astro.umd.edu/~shetty/Research/ | Astrophys.J.665:1138-1158,2007 | 10.1086/520037 | null | astro-ph | null | We use CO and H alpha velocity fields to study the gas kinematics in the
spiral arms and interarms of M51 (NGC 5194), and fit the 2D velocity field to
estimate the radial and tangential velocity components as a function of spiral
phase (arm distance). We find large radial and tangential streaming velocities,
which are qualitatively consistent with the predictions of density wave theory
and support the existence of shocks. The streaming motions are complex, varying
significantly across the galaxy as well as along and between arms. Aberrations
in the velocity field indicate that the disk is not coplanar, perhaps as far in
as 20\arcsec\ (800 pc) from the center. Velocity profile fits from CO and H
alpha are typically similar, suggesting that most of the H alpha emission
originates from regions of recent star formation. We also explore vortensity
and mass conservation conditions. Vortensity conservation, which does not
require a steady state, is empirically verified. The velocity and density
profiles show large and varying mass fluxes, which are inconsistent with a
steady flow for a single dominant global spiral mode. We thus conclude that the
spiral arms cannot be in a quasi-steady state in any rotating frame, and/or
that out of plane motions may be significant.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:58:25 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Shetty",
"Rahul",
""
],
[
"Vogel",
"Stuart N.",
""
],
[
"Ostriker",
"Eve C.",
""
],
[
"Teuben",
"Peter J.",
""
]
] |
0705.3241 | Marc P. Bellon | Marc P. Bellon | On the icosahedron: from two to three dimensions | 8 pages | null | null | null | math.AG | null | In his famous book, Felix Klein describes a complex variable for the
quotients of the ordinary sphere by the finite groups of rotations and in
particular for the most complex situation of the quotient by the symmetry group
of the icosahedron. The purpose of this work and its sequels is to obtain
similar results for the quotients of the three--dimensional sphere. Various
properties of the group $SU(2)$ and of its representations are used to obtain
explicit expressions for coordinates and the relations they satisfy.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:57:29 GMT"
}
] | 2007-05-23T00:00:00 | [
[
"Bellon",
"Marc P.",
""
]
] |
0705.3242 | Kendrah Murphy | Kendrah D. Murphy, Tahir Yaqoob, and Yuichi Terashima | Monitoring the Violent Activity from the Inner Accretion Disk of the
Seyfert 1.9 Galaxy NGC 2992 with RXTE | Abstract is abridged. Accepted for publication in the September 2007
issue of ApJ. 39 pages, 14 figures, 3 tables | Astrophys.J.666:96-108,2007 | 10.1086/520039 | null | astro-ph | null | We present the results of a one year monitoring campaign of the Seyfert 1.9
galaxy NGC 2992 with RXTE. Historically, the source has been shown to vary
dramatically in 2-10 keV flux over timescales of years and was thought to be
slowly transitioning between periods of quiescence and active accretion. Our
results show that in one year the source continuum flux covered almost the
entire historical range, making it unlikely that the low-luminosity states
correspond to the accretion mechanism switching off. During flaring episodes we
found that a highly redshifted Fe K line appears, implying that the violent
activity is occurring in the inner accretion disk, within ~100 gravitational
radii of the central black hole. We also found that the spectral index of the
X-ray continuum remained approximately constant during the large amplitude
variability. These observations make NGC 2992 well-suited for future
multi-waveband monitoring, as a test-bed for constraining accretion models.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:57:10 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Murphy",
"Kendrah D.",
""
],
[
"Yaqoob",
"Tahir",
""
],
[
"Terashima",
"Yuichi",
""
]
] |
0705.3243 | Abraham Flaxman | Abraham D. Flaxman and Juan Vera | Bias reduction in traceroute sampling: towards a more accurate map of
the Internet | 12 pages, 3 figures | null | 10.1007/978-3-540-77004-6_1 | null | physics.soc-ph | null | Traceroute sampling is an important technique in exploring the internet
router graph and the autonomous system graph. Although it is one of the primary
techniques used in calculating statistics about the internet, it can introduce
bias that corrupts these estimates. This paper reports on a theoretical and
experimental investigation of a new technique to reduce the bias of traceroute
sampling when estimating the degree distribution. We develop a new estimator
for the degree of a node in a traceroute-sampled graph; validate the estimator
theoretically in Erdos-Renyi graphs and, through computer experiments, for a
wider range of graphs; and apply it to produce a new picture of the degree
distribution of the autonomous system graph.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 22:43:00 GMT"
}
] | 2009-02-02T00:00:00 | [
[
"Flaxman",
"Abraham D.",
""
],
[
"Vera",
"Juan",
""
]
] |
0705.3244 | Adam Nepomuk Otte | MAGIC Collaboration: J. Albert, et al | VHE Gamma-Ray Observation of the Crab Nebula and its Pulsar with the
MAGIC telescope | Version published in ApJ, added corresponding author | Astrophys.J.674:1037-1055,2008 | 10.1086/525270 | MPP-2007-59 | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report about very high energy (VHE) gamma-ray observations of the Crab
Nebula with the MAGIC telescope. The gamma-ray flux from the nebula was
measured between 60 GeV and 9 TeV. The energy spectrum can be described with a
curved power law dF/dE=f0 (E/300 GeV)^(a+b*log10(E/300 GeV)) with a flux
normalization f0 of(6.0+-0.2)*10^-10 1/(cm^2 s TeV), a=-2.31+-0.06 and
b=-0.26+-0.07. The position of the IC-peak is determined at (77+-47) GeV.
Within the observation time and the experimental resolution of the telescope,
the gamma-ray emission is steady and pointlike. The emission's center of
gravity coincides with the position of the pulsar. Pulsed gamma-ray emission
from the pulsar could not be detected. We constrain the cutoff energy of the
spectrum to be less than 27 GeV, assuming that the differential energy spectrum
has an exponential cutoff. For a super-exponential shape, the cutoff energy can
be as high as 60 GeV.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 18:11:07 GMT"
},
{
"version": "v2",
"created": "Tue, 8 Jan 2008 20:48:56 GMT"
},
{
"version": "v3",
"created": "Wed, 9 Jul 2008 22:44:09 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"MAGIC Collaboration",
"",
""
],
[
"Albert",
"J.",
""
]
] |
0705.3245 | Amir Hajian | Amir Hajian (1), Carlos Hernandez-Monteagudo (2), Raul Jimenez (2),
David Spergel (1), Licia Verde (2) ((1) Princeton, (2) UPenn) | The Kinetic Sunyaev-Zel'dovich Effect Due to the Electrons of Our Galaxy | 4 pages, 6 figures | The Astrophysical Journal, Volume 671, Issue 2, pp. 1079-1083
(2007) | 10.1086/522582 | null | astro-ph | null | We compute the effect of local electrons on the CMB temperature anisotropies.
The number density and distribution of free electrons in our Galaxy has been
accurately measured from pulsar dispersion measurements. Because of their
distribution, the dynamics of our Galaxy and the Galaxy peculiar velocity with
respect to the Hubble flow, these free electrons leave a frequency-independent
imprint on the cosmic microwave background (CMB). In particular, the coherent
motion of the free electrons respect to us and to the CMB rest frame produce a
kinetic Sunyaev-Zeldovich signal. We compute this effect and we note that the
large-scale antisymmetry of the signal gives it an angular power spectrum with
a sawtooth pattern where even multipoles are suppressed with respect to the odd
ones. We find the signal to be small (~ 2 uK) and sub-dominant compared to the
primary CMB and other foreground signals. However, since there are no free
parameters in the modeling of this signal, it can be taken into account if more
precise measurements of the primordial signal are required.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 20:38:38 GMT"
}
] | 2012-02-09T00:00:00 | [
[
"Hajian",
"Amir",
"",
"Princeton"
],
[
"Hernandez-Monteagudo",
"Carlos",
"",
"UPenn"
],
[
"Jimenez",
"Raul",
"",
"UPenn"
],
[
"Spergel",
"David",
"",
"Princeton"
],
[
"Verde",
"Licia",
"",
"UPenn"
]
] |
0705.3246 | Rennan Barkana | Rennan Barkana (Tel Aviv University), Abraham Loeb (Harvard
University) | The Difference PDF of 21-cm Fluctuations: A Powerful Statistical Tool
for Probing Cosmic Reionization | 11 pages, 11 figures, submitted to MNRAS | null | 10.1111/j.1365-2966.2007.12729.x | null | astro-ph | null | A new generation of radio telescopes are currently being built with the goal
of tracing the cosmic distribution of atomic hydrogen at redshifts 6-15 through
its 21-cm line. The observations will probe the large-scale brightness
fluctuations sourced by ionization fluctuations during cosmic reionization.
Since detailed maps will be difficult to extract due to noise and foreground
emission, efforts have focused on a statistical detection of the 21-cm
fluctuations. During cosmic reionization, these fluctuations are highly
non-Gaussian and thus more information can be extracted than just the
one-dimensional function that is usually considered, i.e., the correlation
function. We calculate a two-dimensional function that if measured
observationally would allow a more thorough investigation of the properties of
the underlying ionizing sources. This function is the probability distribution
function (PDF) of the difference in the 21-cm brightness temperature between
two points, as a function of the separation between the points. While the
standard correlation function is determined by a complicated mixture of
contributions from density and ionization fluctuations, we show that the
difference PDF holds the key to separately measuring the statistical properties
of the ionized regions.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 20:16:36 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Barkana",
"Rennan",
"",
"Tel Aviv University"
],
[
"Loeb",
"Abraham",
"",
"Harvard\n University"
]
] |
0705.3247 | Alvaro de Souza Dutra | Alvaro de Souza Dutra (UNESP/Campus de Guaratingueta-DFQ) | Ordering ambiguity versus representation | 8 pages, no figures | Journal of Physics A: Math. Gen., vol. 39, pages 203-208 (2006) | 10.1088/0305-4470/39/1/014 | null | quant-ph | null | In this work we show that the ordering ambiguity on quantization depends on
the representation choice. This property is then used to solve unambiguously
some particular systems. Finally, we speculate on the consequences for more
involved cases.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 20:32:22 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Dutra",
"Alvaro de Souza",
"",
"UNESP/Campus de Guaratingueta-DFQ"
]
] |
0705.3248 | S\'ilvio Duarte Queir\'os M. | Silvio M. Duarte Queiros | On a generalised model for time-dependent variance with long-term memory | 6 pages, 4 figures | EPL, 80 (2007) 30005 | 10.1209/0295-5075/80/30005 | null | physics.data-an q-fin.ST | null | The ARCH process (R. F. Engle, 1982) constitutes a paradigmatic generator of
stochastic time series with time-dependent variance like it appears on a wide
broad of systems besides economics in which ARCH was born. Although the ARCH
process captures the so-called "volatility clustering" and the asymptotic
power-law probability density distribution of the random variable, it is not
capable to reproduce further statistical properties of many of these time
series such as: the strong persistence of the instantaneous variance
characterised by large values of the Hurst exponent (H > 0.8), and asymptotic
power-law decay of the absolute values self-correlation function. By means of
considering an effective return obtained from a correlation of past returns
that has a q-exponential form we are able to fix the limitations of the
original model. Moreover, this improvement can be obtained through the correct
choice of a sole additional parameter, $q_{m}$. The assessment of its validity
and usefulness is made by mimicking daily fluctuations of SP500 financial
index.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 19:33:33 GMT"
}
] | 2008-12-02T00:00:00 | [
[
"Queiros",
"Silvio M. Duarte",
""
]
] |
0705.3249 | Dorette Pronk | Dorette Pronk, Laura Scull | Translation Groupoids and Orbifold Bredon Cohomology | 29 pages, we have added further details and examples; this paper will
appear in the Canadian Journal of Mathematics | null | null | null | math.AT math.CT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the bicategory of (representable) orbifolds and good maps is
equivalent to the bicategory of orbifold translation groupoids and generalized
equivariant maps. We use this result to define an orbifold version of Bredon
cohomology.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 20:40:09 GMT"
},
{
"version": "v2",
"created": "Thu, 15 Nov 2007 01:43:07 GMT"
},
{
"version": "v3",
"created": "Mon, 8 Mar 2010 22:11:41 GMT"
}
] | 2010-03-10T00:00:00 | [
[
"Pronk",
"Dorette",
""
],
[
"Scull",
"Laura",
""
]
] |
0705.3250 | Vladimir Stukopin | Vladimir Stukopin | Yangian of the Strange Lie Superalgebra of $\boldsymbol{Q_{n-1}}$ Type,
Drinfel'd Approach | This is a contribution to the Vadim Kuznetsov Memorial Issue on
Integrable Systems and Related Topics, published in SIGMA (Symmetry,
Integrability and Geometry: Methods and Applications) at
http://www.emis.de/journals/SIGMA/ | SIGMA 3 (2007), 069, 12 pages | 10.3842/SIGMA.2007.069 | null | math.QA | null | The Yangian of the strange Lie superalgebras in Drinfel'd realization is
defined. The current system generators and defining relations are described.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 20:40:54 GMT"
}
] | 2008-04-24T00:00:00 | [
[
"Stukopin",
"Vladimir",
""
]
] |
0705.3251 | Doreen Wackeroth | (The TeV4LHC-Top and Electroweak Working Group:) C.E.Gerber, P.Murat,
T.M.P.Tait, D.Wackeroth, A.Arbuzov, D.Bardin, U.Baur, J.A.Benitez, S.Berge,
S.Bondarenko, E.E.Boos, M.T.Bowen, R.Brock, V.E.Bunichev, J.Campbell,
F.Canelli, Q.-H.Cao, C.M.Carloni Calame, F.Chevallier, P.Christova,
C.Ciobanu, S.Dittmaier, L.V.Dudko, S.D.Ellis, A.I.Etienvre, F.Fiedler,
A.Garcia-Bellido, A.Giammanco, D.Glenzinski, P.Golonka, C.Hays, S.Jadach,
S.Jain, L.Kalinovskaya, M.Kramer, A.Lleres, J.Luck, A.Lucotte, A.Markina,
G.Montagna, P.M.Nadolsky, O.Nicrosini, F.I.Olness, W.Placzek, R.Sadykov,
V.I.Savrin, R.Schwienhorst, A.V.Sherstnev, S.Slabospitsky, B.Stelzer,
M.J.Strassler, Z.Sullivan, F.Tramontano, A.Vicini, W.Wagner, Z.Was, G.Watts,
M.Weber, S.Willenbrock, U.K.Yang, C-P.Yuan, J.Zhu | Tevatron-for-LHC Report: Top and Electroweak Physics | 206 pages, Tevatron-for-LHC Conference Report of the Top and
Electroweak Working Group | null | null | FERMILAB-CONF-07-052 | hep-ph | null | The top quark and electroweak bosons (W and Z) represent the most massive
fundamental particles yet discovered, and as such refer directly to the
Standard Model's greatest remaining mystery: the mechanism by which all
particles gained mass. This report summarizes the work done within the top-ew
group of the Tevatron-for-LHC workshop. It represents a collection of both
Tevatron results, and LHC predictions. The hope is that by considering and
comparing both machines, the LHC program can be improved and aided by knowledge
from the Tevatron, and that particle physics as a whole can be enriched. The
report includes measurements of the top quark mass, searches for single top
quark production, and physics of the electroweak bosons at hadron colliders.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 19:06:04 GMT"
}
] | 2012-08-27T00:00:00 | [
[
"Gerber",
"C. E.",
""
],
[
"Murat",
"P.",
""
],
[
"Tait",
"T. M. P.",
""
],
[
"Wackeroth",
"D.",
""
],
[
"Arbuzov",
"A.",
""
],
[
"Bardin",
"D.",
""
],
[
"Baur",
"U.",
""
],
[
"Benitez",
"J. A.",
""
],
[
"Berge",
"S.",
""
],
[
"Bondarenko",
"S.",
""
],
[
"Boos",
"E. E.",
""
],
[
"Bowen",
"M. T.",
""
],
[
"Brock",
"R.",
""
],
[
"Bunichev",
"V. E.",
""
],
[
"Campbell",
"J.",
""
],
[
"Canelli",
"F.",
""
],
[
"Cao",
"Q. -H.",
""
],
[
"Calame",
"C. M. Carloni",
""
],
[
"Chevallier",
"F.",
""
],
[
"Christova",
"P.",
""
],
[
"Ciobanu",
"C.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Dudko",
"L. V.",
""
],
[
"Ellis",
"S. D.",
""
],
[
"Etienvre",
"A. I.",
""
],
[
"Fiedler",
"F.",
""
],
[
"Garcia-Bellido",
"A.",
""
],
[
"Giammanco",
"A.",
""
],
[
"Glenzinski",
"D.",
""
],
[
"Golonka",
"P.",
""
],
[
"Hays",
"C.",
""
],
[
"Jadach",
"S.",
""
],
[
"Jain",
"S.",
""
],
[
"Kalinovskaya",
"L.",
""
],
[
"Kramer",
"M.",
""
],
[
"Lleres",
"A.",
""
],
[
"Luck",
"J.",
""
],
[
"Lucotte",
"A.",
""
],
[
"Markina",
"A.",
""
],
[
"Montagna",
"G.",
""
],
[
"Nadolsky",
"P. M.",
""
],
[
"Nicrosini",
"O.",
""
],
[
"Olness",
"F. I.",
""
],
[
"Placzek",
"W.",
""
],
[
"Sadykov",
"R.",
""
],
[
"Savrin",
"V. I.",
""
],
[
"Schwienhorst",
"R.",
""
],
[
"Sherstnev",
"A. V.",
""
],
[
"Slabospitsky",
"S.",
""
],
[
"Stelzer",
"B.",
""
],
[
"Strassler",
"M. J.",
""
],
[
"Sullivan",
"Z.",
""
],
[
"Tramontano",
"F.",
""
],
[
"Vicini",
"A.",
""
],
[
"Wagner",
"W.",
""
],
[
"Was",
"Z.",
""
],
[
"Watts",
"G.",
""
],
[
"Weber",
"M.",
""
],
[
"Willenbrock",
"S.",
""
],
[
"Yang",
"U. K.",
""
],
[
"Yuan",
"C-P.",
""
],
[
"Zhu",
"J.",
""
]
] |
0705.3252 | Andrey Todorcv | M. Schonbek, A. Todorov and J. Zubelli | The Hilbert 3/2 Structure and Weil-Petersson Metric on the Space of the
Diffeomorphisms of the Circle Modulo Conformal Maps | A refernce to a Corollary was corrected | null | null | null | math-ph math.MP | null | We gave a new very simple proof that the completion of the space of the
diffeomorphism of the circle modulo conformal maps with respect to the
Weil-Petersson Metric is a complex analytic manifold modeled on the Hilbert
space with 3/2 Sobolev norm. Our proof is based on the analogue of the Hadamard
Theorem that the exponentila map is a complex analytic map from the tanegnt
space of a point of a simply connected manifold to the manifold.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 20:48:16 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 15:25:17 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Schonbek",
"M.",
""
],
[
"Todorov",
"A.",
""
],
[
"Zubelli",
"J.",
""
]
] |
0705.3253 | Thomas Grimm | Thomas W. Grimm | Non-Perturbative Corrections and Modularity in N=1 Type IIB
Compactifications | 35 pages | JHEP 0710:004,2007 | 10.1088/1126-6708/2007/10/004 | null | hep-th | null | Non-perturbative corrections and modular properties of four-dimensional type
IIB Calabi-Yau orientifolds are discussed. It is shown that certain
non-perturbative alpha' corrections survive in the large volume limit of the
orientifold and periodically correct the Kahler potential. These corrections
depend on the NS-NS two form and have to be completed by D-instanton
contributions to transform covariantely under symmetries of the type IIB
orientifold background. It is shown that generically also the D-instanton
superpotential depends on the two-form moduli as well as on the complex
dilaton. These contributions can arise through theta-functions with the dilaton
as modular parameter. An orientifold of the Enriques Calabi-Yau allows to
illustrate these general considerations. It is shown that this compactification
leads to a controlled four-dimensional N=1 effective theory due to the absence
of various quantum corrections. Making contact to the underlying topological
string theory the D-instanton superpotential is proposed to be related to a
specific modular form counting D3, D1, D(-1) degeneracies on the Enriques
Calabi-Yau.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 18:15:01 GMT"
},
{
"version": "v2",
"created": "Mon, 4 Jun 2007 22:29:52 GMT"
}
] | 2009-04-30T00:00:00 | [
[
"Grimm",
"Thomas W.",
""
]
] |
0705.3254 | Fabio Reale | F. Reale | Diagnostics of stellar flares from X-ray observations: from the decay to
the rise phase | 10 pages, 7 figures, accepted on refereed journal | null | 10.1051/0004-6361:20077223 | null | astro-ph | null | The diagnostics of stellar flaring coronal loops have been so far largely
based on the analysis of the decay phase. We derive new diagnostics from the
analysis of the rise and peak phase of stellar flares. We release the
assumption of full equilibrium of the flaring loop at the flare peak, according
to the frequently observed delay between the temperature and the density
maximum. From scaling laws and hydrodynamic simulations we derive diagnostic
formulas as a function of observable quantities and times. We obtain a
diagnostic toolset related to the rise phase, including the loop length,
density and aspect ratio. We discuss the limitations of this approach and find
that the assumption of loop equilibrium in the analysis of the decay leads to a
moderate overestimate of the loop length. A few relevant applications to
previously analyzed stellar flares are shown. The analysis of the flare rise
and peak phase complements and completes the analysis of the decay phase.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 15:04:47 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Reale",
"F.",
""
]
] |
0705.3255 | Sasha Chernyshev | Jurij Smakov, A. L. Chernyshev, Steven R. White | Spinon-holon interactions in an anisotropic t-J chain: a comprehensive
study | 12 pages, 13 figures, long story. The short story is
cond-mat/0702213. Published version | Phys. Rev. B 76, 115106 (2007) | 10.1103/PhysRevB.76.115106 | null | cond-mat.str-el | null | We consider a generalization of the one-dimensional t-J model with
anisotropic spin-spin interactions. We show that the anisotropy leads to an
effective attractive interaction between the spinon and holon excitations,
resulting in a localized bound state. Detailed quantitative analytic
predictions for the dependence of the binding energy on the anisotropy are
presented, and verified by precise numerical simulations. The binding energy is
found to interpolate smoothly between a finite value in the t-Jz limit and zero
in the isotropic limit, going to zero exponentially in the vicinity of the
latter. We identify changes in spinon dispersion as the primary factor for this
non-trivial behavior.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 21:12:40 GMT"
},
{
"version": "v2",
"created": "Tue, 24 Jul 2007 23:28:35 GMT"
},
{
"version": "v3",
"created": "Mon, 10 Sep 2007 21:25:22 GMT"
}
] | 2007-09-11T00:00:00 | [
[
"Smakov",
"Jurij",
""
],
[
"Chernyshev",
"A. L.",
""
],
[
"White",
"Steven R.",
""
]
] |
0705.3256 | Alberto Imparato | Alberto Imparato, Stefano Luccioli, Alessandro Torcini | Reconstructing the free energy landscape of a mechanically unfolded
model protein | null | Phys. Rev. Lett. 99, 168101 (2007) | 10.1103/PhysRevLett.99.168101 | null | cond-mat.stat-mech q-bio.BM | null | The equilibrium free energy landscape of an off-lattice model protein as a
function of an internal (reaction) coordinate is reconstructed from
out-of-equilibrium mechanical unfolding manipulations. This task is
accomplished via two independent methods: by employing an extended version of
the Jarzynski equality (EJE) and the protein inherent structures (ISs). In a
range of temperatures around the ``folding transition'' we find a good
quantitative agreement between the free energies obtained via EJE and IS
approaches. This indicates that the two methodologies are consistent and able
to reproduce equilibrium properties of the examined system. Moreover, for the
studied model the structural transitions induced by pulling can be related to
thermodynamical aspects of folding.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 21:13:52 GMT"
}
] | 2007-10-17T00:00:00 | [
[
"Imparato",
"Alberto",
""
],
[
"Luccioli",
"Stefano",
""
],
[
"Torcini",
"Alessandro",
""
]
] |
0705.3257 | Shane Jensen | Matthew Carruth and Shane T. Jensen | Evaluating Throwing Ability in Baseball | Accepted for publication in the Journal of Quantitative Analysis in
Sports | null | null | null | stat.AP | null | We present a quantitative analysis of throwing ability for major league
outfielders and catchers. We use detailed game event data to tabulate success
and failure events in outfielder and catcher throwing opportunities. We
attribute a run contribution to each success or failure which are tabulated for
each player in each season. We use four seasons of data to estimate the overall
throwing ability of each player using a Bayesian hierarchical model. This model
allows us to shrink individual player estimates towards an overall population
mean depending on the number of opportunities for each player. We use the
posterior distribution of player abilities from this model to identify players
with significant positive and negative throwing contributions.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 21:27:36 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 15:00:20 GMT"
}
] | 2007-06-13T00:00:00 | [
[
"Carruth",
"Matthew",
""
],
[
"Jensen",
"Shane T.",
""
]
] |
0705.3258 | Lisa Prato | L. Prato and A. J. Weinberger | Disks around Young Binary Stars | 10 pages, 2 figures, Chapter to appear in the book "Planets in Binary
Star Systems," ed. Nader Haghighipour (Springer publishing company), 2007 | null | null | null | astro-ph | null | The majority of stars in known star-forming regions are located in binary
systems. Although the separation distribution of these populations varies from
one region to another, most peak between a few and several tens of AU. Given
the >100 AU distance to the youngest regions, binaries with this separation
range are also the most poorly studied. In general, only for about 60 young
pairs have the circumstellar disks and the stellar properties been
well-characterized. We discuss results of recent analyses of inner and outer
disk properties, summarize the status of observations of disk orientations, and
highlight two cases of debris disks in relatively young binaries. A substantial
effort, taking advantage of available and future high-angular resolution
facilities, will be required to further our knowledge of disk evolution in
binaries across the range of separations influential to both terrestrial as
well as giant planet formation.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 21:41:27 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Prato",
"L.",
""
],
[
"Weinberger",
"A. J.",
""
]
] |
0705.3259 | Nceba Mhlahlo | N. Mhlahlo, D.A.H. Buckley, V.S. Dhillon, S.B. Potter, B. Warner, P.
Woudt, G. Bolt, J. McCormick, R. Rea, Denis J. Sullivan and F. Velhuis | The Discovery of a Persistent Quasi-Periodic Oscillation in the
Intermediate Polar TX Col | 9 pages, 6 figures, 3 tables. Accepted by the Monthly Notices of the
Royal Astronomical Society | null | 10.1111/j.1365-2966.2007.12003.x | null | astro-ph | null | We report on the detection of an ~5900 s quasi-periodic variation in the
extensive photometry of TX Col spanning 12 years. We discuss five different
models to explain this period. We favour a mechanism where the quasi-periodic
variation results from the beating of the Keplerian frequency of the `blobs'
orbiting in the outer accretion disc with the spin frequency, and from
modulated accretion of these `blobs' taking place in a shocked region near the
disc/magnetosphere boundary.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 21:41:30 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Mhlahlo",
"N.",
""
],
[
"Buckley",
"D. A. H.",
""
],
[
"Dhillon",
"V. S.",
""
],
[
"Potter",
"S. B.",
""
],
[
"Warner",
"B.",
""
],
[
"Woudt",
"P.",
""
],
[
"Bolt",
"G.",
""
],
[
"McCormick",
"J.",
""
],
[
"Rea",
"R.",
""
],
[
"Sullivan",
"Denis J.",
""
],
[
"Velhuis",
"F.",
""
]
] |
0705.3260 | Diogo Rodrigues Boito | D. R. Boito, M. R. Robilotta | Scalar resonances: scattering and production amplitudes | 10 pages, 4 figures. Minor changes, references added, version to
appear in Phys. Rev. D | Phys.Rev.D76:094011,2007 | 10.1103/PhysRevD.76.094011 | null | hep-ph | null | Scattering and production amplitudes involving scalar resonances are known,
according to Watson's theorem, to share the same phase $\delta(s)$. We show
that, at low energies, the production amplitude is fully determined by the
combination of $\delta(s)$ with another phase $\omega(s)$, which describes
intermediate two-meson propagation and is theoretically unambiguous. Our main
result is a simple and almost model independent expression, which generalizes
the usual $K$-matrix unitarization procedure and is suited to be used in
analyses of production data involving scalar resonances.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 21:55:09 GMT"
},
{
"version": "v2",
"created": "Mon, 8 Oct 2007 17:25:10 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Boito",
"D. R.",
""
],
[
"Robilotta",
"M. R.",
""
]
] |
0705.3261 | Yijia Fan | Yijia Fan, Chao Wang, John Thompson, H. Vincent Poor | Recovering Multiplexing Loss Through Successive Relaying Using
Repetition Coding | To appear in the IEEE Transactions on Wireless Communications | null | 10.1109/TWC.2007.060339 | null | cs.IT math.IT | null | In this paper, a transmission protocol is studied for a two relay wireless
network in which simple repetition coding is applied at the relays.
Information-theoretic achievable rates for this transmission scheme are given,
and a space-time V-BLAST signalling and detection method that can approach them
is developed. It is shown through the diversity multiplexing tradeoff analysis
that this transmission scheme can recover the multiplexing loss of the
half-duplex relay network, while retaining some diversity gain. This scheme is
also compared with conventional transmission protocols that exploit only the
diversity of the network at the cost of a multiplexing loss. It is shown that
the new transmission protocol offers significant performance advantages over
conventional protocols, especially when the interference between the two relays
is sufficiently strong.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 22:26:41 GMT"
}
] | 2016-11-17T00:00:00 | [
[
"Fan",
"Yijia",
""
],
[
"Wang",
"Chao",
""
],
[
"Thompson",
"John",
""
],
[
"Poor",
"H. Vincent",
""
]
] |
0705.3262 | Steve Rodgers | S. D. Rodgers (1), S. B. Charnley (1), R. G. Smith (2) and H. M.
Butner (3) ((1) NASA Ames, (2) University of New South Wales, (3) James
Madison University) | Chemical chronology of the Southern Coalsack | 10 pages, 4 figures, in press at MNRAS | Mon.Not.Roy.Astron.Soc.379:807-815,2007 | 10.1111/j.1365-2966.2007.11985.x | null | astro-ph | null | We demonstrate how the observed H2O ice column densities toward three dense
globules in the Southern Coalsack could be used to constrain the ages of these
sources. We derive ages of ~10^5 yr, in agreement with dynamical studies of
these objects. We have modelled the chemical evolution of the globules, and
show how the molecular abundances are controlled by both the gas density and
the initial chemical conditions as the globules formed. Based on our derived
ages, we predict the column densities of several species of interest. These
predictions should be straightforward to test by performing molecular line
observations
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 22:15:31 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Rodgers",
"S. D.",
""
],
[
"Charnley",
"S. B.",
""
],
[
"Smith",
"R. G.",
""
],
[
"Butner",
"H. M.",
""
]
] |
0705.3263 | J. Gamboa | P. Arias, H. Falomir, J. Gamboa, F. Mendez and F. A. Schaposnik | Chiral Anomaly Beyond Lorentz Invariance | Final version. To be published in PRD | Phys.Rev.D76:025019,2007 | 10.1103/PhysRevD.76.025019 | null | hep-th hep-ph | null | The chiral anomaly in the context of an extended standard model with minimal
Lorentz invariance violation is studied. Taking into account bounds from
measurements of the speed of light, we argue that the chiral anomaly and its
consequences are general results valid even beyond the relativistic symmetry.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 22:23:11 GMT"
},
{
"version": "v2",
"created": "Fri, 1 Jun 2007 21:36:21 GMT"
},
{
"version": "v3",
"created": "Fri, 15 Jun 2007 19:20:07 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Arias",
"P.",
""
],
[
"Falomir",
"H.",
""
],
[
"Gamboa",
"J.",
""
],
[
"Mendez",
"F.",
""
],
[
"Schaposnik",
"F. A.",
""
]
] |
0705.3264 | Eli Rotenberg | Jessica L. McChesney, Aaron Bostwick, Taisuke Ohta, Konstantin V.
Emtsev, Thomas Seyller, Karsten Horn, and Eli Rotenberg | Massive enhancement of electron-phonon coupling in doped graphene by an
electronic singularity | 8 pages | null | null | null | cond-mat.str-el cond-mat.supr-con | null | The nature of the coupling leading to superconductivity in layered materials
such as high-Tc superconductors and graphite intercalation compounds (GICs) is
still unresolved. In both systems, interactions of electrons with either
phonons or other electrons or both have been proposed to explain
superconductivity. In the high-Tc cuprates, the presence of a Van Hove
singularity (VHS) in the density of states near the Fermi level was long ago
proposed to enhance the many-body couplings and therefore may play a role in
superconductivity. Such a singularity can cause an anisotropic variation in the
coupling strength, which may partially explain the so-called nodal-antinodal
dichotomy in the cuprates. Here we show that the topology of the graphene band
structure at dopings comparable to the GICs is quite similar to that of the
cuprates and that the quasiparticle dynamics in graphene have a similar
dichotomy. Namely, the electron-phonon coupling is highly anisotropic,
diverging near a saddle point in the graphene electronic band structure. These
results support the important role of the VHS in layered materials and the
possible optimization of Tc by tuning the VHS with respect to the Fermi level.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 22:37:42 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"McChesney",
"Jessica L.",
""
],
[
"Bostwick",
"Aaron",
""
],
[
"Ohta",
"Taisuke",
""
],
[
"Emtsev",
"Konstantin V.",
""
],
[
"Seyller",
"Thomas",
""
],
[
"Horn",
"Karsten",
""
],
[
"Rotenberg",
"Eli",
""
]
] |
0705.3265 | Robert Brandenberger | Robert H. Brandenberger, Andrew R. Frey and Sugumi Kanno | Towards A Nonsingular Tachyonic Big Crunch | 7 pages, two references added | Phys.Rev.D76:063502,2007 | 10.1103/PhysRevD.76.063502 | null | hep-th astro-ph gr-qc hep-ph | null | We discuss an effective field theory background containing the gravitational
field, the dilaton and a closed string tachyon, and couple this background to a
gas of fundamental strings and D strings. Allowing for the possibility of a
non-vanishing dilaton potential of Casimir type, we demonstrate the possibility
of obtaining a nonsingular, static tachyon condensate phase with fixed dilaton.
The time reversal of our solution provides a candidate effective field theory
description of a Hagedorn phase of string gas cosmology with fixed dilaton.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 23:04:17 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Jun 2007 03:36:39 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Brandenberger",
"Robert H.",
""
],
[
"Frey",
"Andrew R.",
""
],
[
"Kanno",
"Sugumi",
""
]
] |
0705.3266 | Viktor A. Podolskiy | Nicholas A. Kuhta, Viktor A. Podolskiy, and Alexei L. Efros | Far field imaging by a planar lens: diffraction versus superresolution | null | Phys. Rev. B. v. 76, 205102 (2007) | 10.1103/PhysRevB.76.205102 | null | physics.optics | null | We resolve the long standing controversy regarding the imaging by a planar
lens made of left-handed media and demonstrate theoretically that its far field
image has a fundamentally different origin depending on the relationship
between losses {inside} the lens and the wavelength of the light $\lambda$. At
small enough $\lambda$ the image is always governed by diffraction theory, and
the resolution is independent of the absorption if both Im$\epsilon \ll 1$ and
Im$\mu \ll 1$. For any finite $\lambda$, however, a critical absorption exists
below which the superresolution regime takes place, though this absorption is
extremely low and can hardly be achieved. We demonstrate that the transition
between diffraction limited and superresolution regimes is governed by {the}
universal parameter combining absorption, wavelength, and lens thickness.
Finally, we show that this parameter is related to the resonant excitation of
the surface plasma waves.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 23:12:03 GMT"
}
] | 2008-02-04T00:00:00 | [
[
"Kuhta",
"Nicholas A.",
""
],
[
"Podolskiy",
"Viktor A.",
""
],
[
"Efros",
"Alexei L.",
""
]
] |
0705.3267 | Valeri Makarov | V. V. Makarov and D. W. Murphy | The local stellar velocity field via vector spherical harmonics | accepted in AJ | Astron.J.134:367-375,2007 | 10.1086/518242 | null | astro-ph | null | We analyze the local field of stellar tangential velocities for a sample of
$42 339$ non-binary Hipparcos stars with accurate parallaxes, using a vector
spherical harmonic formalism. We derive simple relations between the parameters
of the classical linear model (Ogorodnikov-Milne) of the local systemic field
and low-degree terms of the general vector harmonic decomposition. Taking
advantage of these relationships we determine the solar velocity with respect
to the local stars of $(V_X,V_Y,V_Z)=(10.5, 18.5, 7.3)\pm 0.1$ \kms. The Oort's
parameters determined by a straightforward least-squares adjustment in vector
spherical harmonics, are $A=14.0\pm 1.4$, $B=-13.1\pm 1.2$, $K=1.1\pm 1.8$, and
$C=-2.9\pm 1.4$ \kmspc. We find a few statistically significant higher degree
harmonic terms, which do not correspond to any parameters in the classical
linear model. One of them, a third-degree electric harmonic, is tentatively
explained as the response to a negative linear gradient of rotation velocity
with distance from the Galactic plane, which we estimate at $\sim -20$ \kmspc.
The most unexpected and unexplained term within the Ogorodnikov-Milne model is
the first-degree magnetic harmonic representing a rigid rotation of the stellar
field about the axis $-Y$ pointing opposite to the direction of rotation. This
harmonic comes out with a statistically robust coefficient $6.2 \pm 0.9$
\kmspc, and is also present in the velocity field of more distant stars. The
ensuing upward vertical motion of stars in the general direction of the
Galactic center and the downward motion in the anticenter direction are
opposite to the vector field expected from the stationary Galactic warp model.
| [
{
"version": "v1",
"created": "Tue, 22 May 2007 23:56:32 GMT"
}
] | 2019-08-19T00:00:00 | [
[
"Makarov",
"V. V.",
""
],
[
"Murphy",
"D. W.",
""
]
] |
0705.3268 | Ronald Pepino | R. A. Pepino, J. Cooper, D. Z. Anderson, M. J. Holland | Atomtronic circuits of diodes and transistors | Significantly Revised, and accepted for publication in PRL 2009 | null | null | null | physics.atom-ph cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We illustrate that open quantum systems composed of neutral, ultracold atoms
in one-dimensional optical lattices can exhibit behavior analogous to
semiconductor electronic circuits. A correspondence is demonstrated for bosonic
atoms, and the experimental requirements to realize these devices are
established. The analysis follows from a derivation of a quantum master
equation for this general class of open quantum systems.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 00:09:22 GMT"
},
{
"version": "v2",
"created": "Fri, 4 Sep 2009 17:33:18 GMT"
}
] | 2009-09-04T00:00:00 | [
[
"Pepino",
"R. A.",
""
],
[
"Cooper",
"J.",
""
],
[
"Anderson",
"D. Z.",
""
],
[
"Holland",
"M. J.",
""
]
] |
0705.3269 | Dunc Lorimer | D.R. Lorimer, P.C.C. Freire, I.H. Stairs, M. Kramer, M.A. McLaughlin,
M. Burgay, S.E. Thorsett, R.J. Dewey, A.G. Lyne, R.N. Manchester, N. D'Amico,
A. Possenti, B.C. Joshi | Age constraints in the double pulsar system J0737-3039 | 5 pages, 2 figures, 1 table, accepted for publication by MNRAS | Mon.Not.Roy.Astron.Soc.379:1217-1221,2007 | 10.1111/j.1365-2966.2007.12013.x | null | astro-ph | null | We investigate the age constraints that can be placed on the double pulsar
system using models for the spin-down of the first-born 22.7-ms pulsar A and
the 2.77-s pulsar B with characteristic ages of 210 and 50 Myr respectively.
Standard models assuming dipolar spin-down of both pulsars suggest that the
time since the formation of B is ~50 Myr, i.e. close to B's characteristic age.
However, adopting models which account for the impact of A's relativistic wind
on B's spin-down we find that the formation of B took place either 80 or 180
Myr ago, depending the interaction mechanism. Formation 80 Myr ago, closer to
B's characteristic age, would result in the contribution from J0737-3039 to the
inferred coalescence rates for double neutron star binaries increasing by 40%.
The 180 Myr age is closer to A's characteristic age and would be consistent
with the most recent estimates of the coalescence rate. The new age constraints
do not significantly impact recent estimates of the kick velocity, tilt angle
between pre and post-supernova orbital planes or pre-supernova mass of B's
progenitor.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 00:04:06 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Lorimer",
"D. R.",
""
],
[
"Freire",
"P. C. C.",
""
],
[
"Stairs",
"I. H.",
""
],
[
"Kramer",
"M.",
""
],
[
"McLaughlin",
"M. A.",
""
],
[
"Burgay",
"M.",
""
],
[
"Thorsett",
"S. E.",
""
],
[
"Dewey",
"R. J.",
""
],
[
"Lyne",
"A. G.",
""
],
[
"Manchester",
"R. N.",
""
],
[
"D'Amico",
"N.",
""
],
[
"Possenti",
"A.",
""
],
[
"Joshi",
"B. C.",
""
]
] |
0705.3270 | Hiroki Matui | Thierry Giordano, Hiroki Matui, Ian F. Putnam and Christian F. Skau | The absorption theorem for affable equivalence relations | null | null | null | null | math.DS math.OA | null | We prove a result about extension of a minimal AF-equivalence relation R on
the Cantor set X, the extension being `small' in the sense that we modify R on
a thin closed subset Y of X. We show that the resulting extended equivalence
relation S is orbit equivalent to the original R, and so, in particular, S is
affable. Even in the simplest case--when Y is a finite set--this result is
highly non-trivial. The result itself--called the absorption theorem--is a
powerful and crucial tool for the study of the orbit structure of minimal
Z^n-actions on the Cantor set [GMPS]. The absorption theorem is a significant
generalization of the main theorem proved in [GPS2]. However, we shall need a
few key results from [GPS2] in order to prove the absorption theorem.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 00:25:01 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 05:05:07 GMT"
}
] | 2007-10-09T00:00:00 | [
[
"Giordano",
"Thierry",
""
],
[
"Matui",
"Hiroki",
""
],
[
"Putnam",
"Ian F.",
""
],
[
"Skau",
"Christian F.",
""
]
] |
0705.3271 | Matt Bainbridge | Matt Bainbridge | Billiards in L-shaped tables with barriers | 63 pages, 6 figures | null | null | null | math.GT math.DS | null | We compute the volumes of the eigenform loci in the moduli space of genus two
Abelian differentials. From this, we obtain asymptotic formulas for counting
closed billiards paths in certain L-shaped polygons with barriers.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 00:27:43 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Bainbridge",
"Matt",
""
]
] |
0705.3272 | Ashley Ruiter | A. J. Ruiter, K. Belczynski, M. Benacquista, S. L. Larson, G. Williams | The LISA Gravitational Wave Foreground: A Study of Double White Dwarfs | ApJ accepted. 28 pages, 11 figures (low resolution), 5 tables, some
new references and changed content since last astro-ph version | Astrophys.J.717:1006-1021,2010 | 10.1088/0004-637X/717/2/1006 | null | astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Double white dwarfs are expected to be a source of confusion-limited noise
for the future gravitational wave observatory LISA. In a specific frequency
range, this 'foreground noise' is predicted to rise above the instrumental
noise and hinder the detection of other types of signals, e.g., gravitational
waves arising from stellar mass objects inspiraling into massive black holes.
In many previous studies only detached populations of compact object binaries
have been considered in estimating the LISA gravitational wave foreground
signal. Here, we investigate the influence of compact object detached and
Roche-Lobe Overflow Galactic binaries on the shape and strength of the LISA
signal. Since >99% of remnant binaries which have orbital periods within the
LISA sensitivity range are white dwarf binaries, we consider only these
binaries when calculating the LISA signal. We find that the contribution of
RLOF binaries to the foreground noise is negligible at low frequencies, but
becomes significant at higher frequencies, pushing the frequency at which the
foreground noise drops below the instrumental noise to >6 mHz. We find that it
is important to consider the population of mass transferring binaries in order
to obtain an accurate assessment of the foreground noise on the LISA data
stream. However, we estimate that there still exists a sizeable number (~11300)
of Galactic double white dwarf binaries which will have a signal-to-noise ratio
>5, and thus will be potentially resolvable with LISA. We present the LISA
gravitational wave signal from the Galactic population of white dwarf binaries,
show the most important formation channels contributing to the LISA disc and
bulge populations and discuss the implications of these new findings.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 01:27:07 GMT"
},
{
"version": "v2",
"created": "Tue, 14 Oct 2008 20:40:06 GMT"
},
{
"version": "v3",
"created": "Mon, 10 May 2010 15:00:52 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Ruiter",
"A. J.",
""
],
[
"Belczynski",
"K.",
""
],
[
"Benacquista",
"M.",
""
],
[
"Larson",
"S. L.",
""
],
[
"Williams",
"G.",
""
]
] |
0705.3273 | Serge Tabachnikov | Serge Tabachnikov | Birkhoff billiards are insecure | null | null | null | null | math.DG math.DS | null | We prove that every compact plane billiard, bounded by a smooth curve, is
insecure: there exist pairs of points $A,B$ such that no finite set of points
can block all billiard trajectories from $A$ to $B$.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 00:46:24 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Tabachnikov",
"Serge",
""
]
] |
0705.3274 | Hyesung Kang | Hyesung Kang and T. W. Jones | Self-Similar Evolution of Cosmic-Ray-Modified Quasi-Parallel Plane
Shocks | 29 pages, 8 figures | Astropart.Phys.28:232-246,2007 | 10.1016/j.astropartphys.2007.05.007 | null | astro-ph | null | Using an improved version of the previously introduced CRASH (Cosmic Ray
Acceleration SHock) code, we have calculated the time evolution of cosmic-ray
(CR) modified quasi-parallel plane shocks for Bohm-like diffusion, including
self-consistent models of Alfven wave drift and dissipation, along with thermal
leakage injection of CRs. The new simulations follow evolution of the CR
distribution to much higher energies than our previous study, providing a
better examination of evolutionary and asymptotic behaviors. The postshock CR
pressure becomes constant after quick initial adjustment, since the evolution
of the CR partial pressure expressed in terms of a momentum similarity variable
is self-similar. The shock precursor, which scales as the diffusion length of
the highest energy CRs, subsequently broadens approximately linearly with time,
independent of diffusion model, so long as CRs continue to be accelerated to
ever-higher energies. This means the nonlinear shock structure can be described
approximately in terms of the similarity variable, x/(u_s t), where u_s is the
shock speed once the postshock pressure reaches an approximate time asymptotic
state. As before, the shock Mach number is the key parameter determining the
evolution and the CR acceleration efficiency, although finite Alfven wave drift
and wave energy dissipation in the shock precursor reduce the effective
velocity change experienced by CRs, so reduce acceleration efficiency
noticeably, thus, providing a second important parameter at low and moderate
Mach numbers.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 00:49:49 GMT"
}
] | 2009-06-23T00:00:00 | [
[
"Kang",
"Hyesung",
""
],
[
"Jones",
"T. W.",
""
]
] |
0705.3275 | Sebastian Burciu M | Sebastian Marius Burciu | Quantum doubles of certain rank two pointed Hopf algebras | This paper has been withdrawn by the author. withdrawn to be reviewed | null | null | null | math.RA | null | A certain class of rank two pointed Hopf algebras is considered. The simple
modules of their Drinfel'd double is described using Radford's method
\cite{rad}. The socle of the tensor product of two such modules is computed and
a formula similar to the one in \cite{one} is obtained in some conditions.
Cases when such a tensor product is completely irreducible are also given in
the last section.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:58:38 GMT"
},
{
"version": "v2",
"created": "Sat, 2 Oct 2010 16:56:11 GMT"
}
] | 2010-10-05T00:00:00 | [
[
"Burciu",
"Sebastian Marius",
""
]
] |
0705.3276 | Jun Jing | Jun Jing, Zhi-guo L\"u, Guo-hong Yang | Controllable dynamics of two separate qubits in Bell states | 18 pages, 6 figures | PHYSICAL REVIEW A 76, 032322 (2007) | 10.1103/PhysRevA.76.032322 | null | quant-ph | null | The dynamics of entanglement and fidelity for a subsystem of two separate
spin-1/2 qubits prepared in Bell states is investigated. One of the subsystem
qubit labelled $A$ is under the influence of a Heisenberg XY spin-bath, while
another one labelled $B$ is uncoupled with that. We discuss two cases: (i) the
number of bath spins $N\to\infty$; (ii) $N$ is finite: N=40. In both cases, the
bath is initially prepared in a thermal equilibrium state. It is shown that the
time dependence of the concurrence and the fidelity of the two subsystem qubits
can be controlled by tuning the parameters of the spin-bath, such as the
anisotropic parameter, the temperature and the coupling strength with qubit
$A$. It is interesting to find the dynamics of the concurrence is independent
of four different initial Bell states and that of the fidelity is divided into
two groups.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 01:59:43 GMT"
},
{
"version": "v2",
"created": "Tue, 9 Oct 2007 09:58:28 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Jing",
"Jun",
""
],
[
"Lü",
"Zhi-guo",
""
],
[
"Yang",
"Guo-hong",
""
]
] |
0705.3277 | Kevin E. Cahill | Kevin Cahill | Inflation in a Symmetric Vacuum | 4 pages | null | null | null | gr-qc | null | If in a finite universe, the tree-level vacuum is a symmetric superposition
of coherent states, in each of which the inflaton field assumes a different,
energy-minimizing mean value (vev), then the resulting energy is positive and
decreases exponentially as the volume of the universe increases. This effect
can drive inflation when that volume is small and explain part of dark energy
when it is big, but the effect is exceedingly tiny except at very early times.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 02:09:17 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Cahill",
"Kevin",
""
]
] |
0705.3278 | Buang Ann Tay | B. A. Tay, T. Petrosky | On the Thermal Symmetry of the Markovian Master Equation | Eqs.(64a), (65a)-(68) are corrected | Phys. Rev. A 76, 042102 (2007) | 10.1103/PhysRevA.76.042102 | null | math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum Markovian master equation of the reduced dynamics of a harmonic
oscillator coupled to a thermal reservoir is shown to possess thermal symmetry.
This symmetry is revealed by a Bogoliubov transformation that can be
represented by a hyperbolic rotation acting on the Liouville space of the
reduced dynamics. The Liouville space is obtained as an extension of the
Hilbert space through the introduction of tilde variables used in the
thermofield dynamics formalism. The angle of rotation depends on the
temperature of the reservoir, as well as the value of Planck's constant. This
symmetry relates the thermal states of the system at any two temperatures. This
includes absolute zero, at which purely quantum effects are revealed. The
Caldeira-Leggett equation and the classical Fokker-Planck equation also possess
thermal symmetry. We compare the thermal symmetry obtained from the Bogoliubov
transformation in related fields and discuss the effects of the symmetry on the
shape of a Gaussian wave packet.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 02:40:16 GMT"
},
{
"version": "v2",
"created": "Mon, 1 Oct 2007 06:21:44 GMT"
},
{
"version": "v3",
"created": "Wed, 25 Jul 2012 01:00:30 GMT"
}
] | 2012-07-26T00:00:00 | [
[
"Tay",
"B. A.",
""
],
[
"Petrosky",
"T.",
""
]
] |
0705.3279 | Jusak Tandean | Oleg Antipin, Jusak Tandean, G. Valencia | The Decay Omega^- -> Xi^- pi^+ pi^- in Chiral Perturbation Theory | 12 pages, 5 figures | Phys.Rev.D76:094024,2007 | 10.1103/PhysRevD.76.094024 | null | hep-ph | null | We study the decay Omega^- -> Xi^- pi^+ pi^- in heavy-baryon chiral
perturbation theory. At leading order, the decay is completely dominated by the
Xi^{*0}(1530) intermediate state, and the predicted rate and Xi^-pi^+ mass
distribution are in conflict with currently available data. It is possible to
resolve this conflict by considering additional contributions at
next-to-leading order.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 02:43:56 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Antipin",
"Oleg",
""
],
[
"Tandean",
"Jusak",
""
],
[
"Valencia",
"G.",
""
]
] |
0705.3280 | Masaki Izumi | Masaki Izumi and R. Srinivasan | Generalized CCR Flows | 45 pages | null | 10.1007/s00220-008-0447-z | null | math.OA math.FA | null | We introduce a new construction of $E_0$-semigroups, called generalized CCR
flows, with two kinds of descriptions: those arising from sum systems and those
arising from pairs of $C_0$-semigroups. We get a new necessary and sufficient
condition for them to be of type III, when the associated sum system is of
finite index. Using this criterion, we construct examples of type III
$E_0$-semigroups, which can not be distinguished from $E_0$-semigroups of type
I by the invariants introduced by Boris Tsirelson. Finally, by considering the
local von Neumann algebras, and by associating a type III factor to a given
type III $E_0$-semigroup, we show that there exist uncountably many type III
$E_0$-semigroups in this family, which are mutually non-cocycle conjugate.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 03:29:11 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Izumi",
"Masaki",
""
],
[
"Srinivasan",
"R.",
""
]
] |
0705.3281 | Dmitry Malyshev V | Dmitry Malyshev | Del Pezzo singularities and SUSY breaking | 40 pages, 5 figures, v2: references added | Adv.High Energy Phys.2011:630892 | 10.1155/2011/630892 | null | hep-th | null | An analytic construction of compact Calabi-Yau manifolds with del Pezzo
singularities is found. We present complete intersection CY manifolds for all
del Pezzo singularities and study the complex deformations of these
singularities. An example of the quintic CY manifold with del Pezzo 6
singularity and some number of conifold singularities is studied in details.
The possibilities for the 'geometric' and ISS mechanisms of dynamical SUSY
breaking are discussed. As an example, we construct the ISS vacuum for the del
Pezzo 6 singularity.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 04:04:14 GMT"
},
{
"version": "v2",
"created": "Sat, 25 Aug 2007 00:20:06 GMT"
}
] | 2011-09-08T00:00:00 | [
[
"Malyshev",
"Dmitry",
""
]
] |
0705.3282 | Nurulla Azamov | Nurulla Azamov | Infinitesimal spectral flow and scattering matrix | 12 pages, LaTeX; minor changes | null | null | null | math.SP | null | In this note the notion of infinitesimal scattering matrix is introduced. It
is shown that under certain assumption, the scattering operator of a pair of
trace compatible operators is equal to the chronological exponential of the
infinitesimal scattering matrix and that the trace of the infinitesimal
scattering matrix is equal to the absolutely continuous part of the
infinitesimal spectral flow. As a corollary, a variant of the Birman-Krein
formula is derived. An interpretation of Pushnitski's $\mu$-invariant is given.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 03:41:29 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 04:18:05 GMT"
},
{
"version": "v3",
"created": "Thu, 14 Jun 2007 00:38:31 GMT"
},
{
"version": "v4",
"created": "Tue, 23 Oct 2007 09:25:12 GMT"
}
] | 2007-10-23T00:00:00 | [
[
"Azamov",
"Nurulla",
""
]
] |
0705.3283 | Kengo Matsumoto | Kengo Matsumoto | Actions of symbolic dynamical systems on $C^*$-algebras II. Simplicity
of $C^*$-symbolic crossed products and some examples | 28 pages | null | null | null | math.OA | null | We have introduced a notion of $C^*$-symbolic dynamical system in [K.
Matsumoto: Actions of symbolic dynamical systems on $C^*$-algebras, to appear
in J. Reine Angew. Math.], that is a finite family of endomorphisms of a
$C^*$-algebra with some conditions. The endomorphisms are indexed by symbols
and yield both a subshift and a $C^*$-algebra of a Hilbert $C^*$-bimodule. The
associated $C^*$-algebra with the $C^*$-symbolic dynamical system is regarded
as a crossed product by the subshift. We will study a simplicity condition of
the $C^*$-algebras of the $C^*$-symbolic dynamical systems. Some examples such
as irrational rotation Cuntz-Krieger algebras will be studied.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 04:15:43 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Matsumoto",
"Kengo",
""
]
] |
0705.3284 | Aasis Vinayak. P. G | Aasis Vinayak P. G | On a mathematical frame of reference | The author would like to thank Dr. Maurizio Consoli of Italian
National Institute of Nuclear Physics for the discussions in the matter and
by pointing out errors in the manuscript and style of presentation | null | null | null | physics.gen-ph | null | This papers aims at revisiting Minkowski space-time with a modified outlook
and making it more consistent (III.8). The paper scrutinizes the special case
of relativistic hypothesis (STR). The paper tries to solve the problems faced
by relativistic hypothesis by proposing a purely mathematically formulated
reference (and not a frame like aether) frame that suits string theory. Then
checking the validity of the frame by applying to various phenomenon and
aspects explained by STR; and also its properties when the experimental
statistics are taken into account in a homogeneous and isotropic large scale
structure of Universe. Further more the paper checks whether introducing the
frame solves the problems in STR; then looks into the occurrences of new
paradoxes in the frame, if any present.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 04:27:46 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"G",
"Aasis Vinayak P.",
""
]
] |
0705.3285 | Fabian Pauly | F. Pauly, J. K. Viljas, J. C. Cuevas, and Gerd Sch\"on | Tilt-angle landscapes and temperature dependence of the conductance in
biphenyl-dithiol single-molecule junctions | 9 pages, 6 figures; submitted to Phys. Rev. B | Phys. Rev. B 77, 155312 (2008) | 10.1103/PhysRevB.77.155312 | null | cond-mat.mes-hall | null | Using a density-functional-based transport method we study the conduction
properties of several biphenyl-derived dithiol (BPDDT) molecules wired to gold
electrodes. The BPDDT molecules differ in their side groups, which control the
degree of conjugation of the pi-electron system. We have analyzed the
dependence of the low-bias zero-temperature conductance on the tilt angle phi
between the two phenyl ring units, and find that it follows closely a
cos^2(phi) law, as expected from an effective pi-orbital coupling model. We
show that the tilting of the phenyl rings results in a decrease of the
zero-temperature conductance by roughly two orders of magnitude, when going
from a planar conformation to a configuration in which the rings are
perpendicular. In addition we demonstrate that the side groups, apart from
determining phi, have no influence on the conductance. All this is in agreement
with the recent experiment by Venkataraman et al. [Nature 442, 904 (2006)].
Finally, we study the temperature dependence of both the conductance and its
fluctuations and find qualitative differences between the examined molecules.
In this analysis we consider two contributions to the temperature behavior, one
coming from the Fermi functions and the other one from a thermal average over
different contact configurations. We illustrate that the fluctuations of the
conductance due to temperature-induced changes in the geometric structure of
the molecule can be reduced by an appropriate design.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 07:30:23 GMT"
}
] | 2009-05-24T00:00:00 | [
[
"Pauly",
"F.",
""
],
[
"Viljas",
"J. K.",
""
],
[
"Cuevas",
"J. C.",
""
],
[
"Schön",
"Gerd",
""
]
] |
0705.3286 | Jiaxu Zuo Dr. | Jiaxu Zuo (for the STAR Collaboration) | Particle Ratios on the Near and Away-Side of Jets at RHIC | 8 pages, 4 figures, 1 table. Proceedings for the 23rd Winter Workshop
on Nuclear Dynamics, Big Sky (Montana), USA, 11-18 February 2007 | null | null | null | nucl-ex | null | We measure the relative abundances of strange mesons, baryons, and
anti-baryons correlated with high-$p_T$ trigger particles in $^{197}$Au +
$^{197}$Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Particle yields and ratios
are extracted on the near-side and away-side of the trigger particle. The
associate-particle ratios are studied as a function of the angle relative to
the trigger particle azimuth $\Delta\phi$. Such studies should help elucidate
the origin of the previously observed correlations and their strong
modifications in Au+Au collisions relative to p+p collisions. We discuss how
these measurements might be related to several scenarios for interactions of
fast partons with the medium in Au+Au collision.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 04:41:29 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Zuo",
"Jiaxu",
"",
"for the STAR Collaboration"
]
] |
0705.3287 | Feng Wu | Feng Wu and Ming Zhong | The Lee-Wick Fields out of Gravity | 8 pages, 1 figure, typos fixed | Phys.Lett.B659:694-697,2008 | 10.1016/j.physletb.2007.11.082 | null | hep-ph hep-th | null | We study the Maxwell-Einstein theory in the framework of effective field
theories. We show that the modified one-loop renormalizable Lagrangian due to
quantum gravitational effects contains a Lee-Wick vector field as an extra
degree of freedom in the theory. Thus gravity provides a natural mechanism for
the emergence of this exotic particle.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 04:58:29 GMT"
},
{
"version": "v2",
"created": "Fri, 28 Dec 2007 03:26:11 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Wu",
"Feng",
""
],
[
"Zhong",
"Ming",
""
]
] |
0705.3288 | Hajime Kawahara | Hajime Kawahara, Tetsu Kitayama, Shin Sasaki, and Yasushi Suto | Systematic Errors in the Hubble Constant Measurement from the
Sunyaev-Zel'dovich effect | 26 pages, 7 figures, accepted for publication in ApJ, Minor changes | null | 10.1086/524132 | null | astro-ph | null | The Hubble constant estimated from the combined analysis of the
Sunyaev-Zel'dovich effect and X-ray observations of galaxy clusters is
systematically lower than those from other methods by 10-15 percent. We examine
the origin of the systematic underestimate using an analytic model of the
intracluster medium (ICM), and compare the prediction with idealistic triaxial
models and with clusters extracted from cosmological hydrodynamical
simulations. We identify three important sources for the systematic errors;
density and temperature inhomogeneities in the ICM, departures from
isothermality, and asphericity. In particular, the combination of the first two
leads to the systematic underestimate of the ICM spectroscopic temperature
relative to its emission-weighed one. We find that these three systematics well
reproduce both the observed bias and the intrinsic dispersions of the Hubble
constant estimated from the Sunyaev-Zel'dovich effect.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 05:01:07 GMT"
},
{
"version": "v2",
"created": "Thu, 4 Oct 2007 17:39:27 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Kawahara",
"Hajime",
""
],
[
"Kitayama",
"Tetsu",
""
],
[
"Sasaki",
"Shin",
""
],
[
"Suto",
"Yasushi",
""
]
] |
0705.3289 | Maxim Markevitch | Maxim Markevitch (CfA) | Helium abundance in galaxy clusters and Sunyaev-Zeldovich effect | 4 pages, 2 figures; arXiv e-print only. (This paper was originally
submitted to ApJL and got a positive referee's report, but the author did not
get to resubmitting a revised version in reasonable time, so it was
automatically withdrawn.) | null | null | null | astro-ph astro-ph.CO astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has long been suggested that helium nuclei in the intracluster plasma can
sediment in the cluster gravitational potential well. Some theoretical
estimates for the cores of relaxed clusters predict an excess of helium
abundance by up to a factor of a few over its primordial value. The
intracluster helium abundance cannot be measured directly. This presents a
significant source of uncertainty for cosmological tests based on the X-ray
derived cluster quantities, such as the gas mass, total mass, and gas mass
fraction, all of which depend on the assumed helium abundance. We point out
that cluster distances derived by combining the Sunyaev-Zeldovich (SZ) and
X-ray data also depend on the helium abundance. This dependence can be used to
measure the abundance, provided the distance is known independently. For
example, if one adopts the WMAP H_0 value, then the recent H_0 measurement by
Bonamente and collaborators, derived from SZ data on 38 clusters assuming a
primordial helium abundance, corresponds to an abundance excess by a factor of
1.9+-0.8 within r~1 Mpc (using only their statistical errors). This shows that
interesting accuracy is within reach. We also briefly discuss how the SZ and
X-ray cluster data can be combined to resolve the helium abundance dependence
for the d_a(z) cosmological test.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 05:09:07 GMT"
},
{
"version": "v2",
"created": "Mon, 11 Jul 2011 00:46:41 GMT"
}
] | 2011-07-12T00:00:00 | [
[
"Markevitch",
"Maxim",
"",
"CfA"
]
] |
0705.3290 | Asan Damanik | Asan Damanik, Mirza Satriawan, Muslim, Pramudita Anggraita | Neutrino Mass Matrix from Seesaw Mechanism Subjected to Texture Zero and
Invariant Under a Cyclic Permutation | 8 pages, no figure,typos corrected,three references added | null | null | null | hep-ph | null | We evaluate the predictive power of the neutrino mass matrices arising from
seesaw mechanism subjected to texture zero and satisfying a cyclic permutation
invariant. We found that only two from eight possible patterns of the neutrino
mass matrices are invariant under a cyclic permutation. The two resulted
neutrino mass matrices which are invariant under a cyclic permutation can be
used qualitatively to explain the neutrino mixing phenomena for solar neutrino
and to derive the mixing angle that agress with the experimental data.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 05:10:48 GMT"
},
{
"version": "v2",
"created": "Thu, 24 May 2007 11:44:19 GMT"
},
{
"version": "v3",
"created": "Fri, 8 Jun 2007 07:16:08 GMT"
},
{
"version": "v4",
"created": "Tue, 12 Jun 2007 05:32:11 GMT"
}
] | 2007-06-12T00:00:00 | [
[
"Damanik",
"Asan",
""
],
[
"Satriawan",
"Mirza",
""
],
[
"Muslim",
"",
""
],
[
"Anggraita",
"Pramudita",
""
]
] |
0705.3291 | Kazumi Okuyama | Kazumi Okuyama | Instanton Solution in Tachyon Cosmology | 7 pages, 1 figure | Phys.Lett.B658:241-243,2008 | 10.1016/j.physletb.2007.06.046 | null | hep-th | null | We find an exact classical solution in Euclidean gravity coupled to a scalar
field with a particular form of potential commonly used in tachyon cosmology.
This solution represents a tunneling between two vacua.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 06:35:25 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Okuyama",
"Kazumi",
""
]
] |
0705.3292 | Balachandran Sathiapalan | B. Sathiapalan | Gauge Invariant Exact Renormalization Group and Perfect Actions in the
Open Bosonic String Theory | 19 pages, Latex | Mod.Phys.Lett.A22:1701-1715,2007 | 10.1142/S0217732307023985 | IMSC/2007/05/06 | hep-th | null | The exact renormalization group is applied to the world sheet theory
describing bosonic open string backgrounds to obtain the equations of motion
for the fields of the open string. Using loop variable techniques the equations
can be constructed to be gauge invariant. Furthermore they are valid off the
(free) mass shell. This requires keeping a finite cutoff. Thus we have the
interesting situation of a scale invariant world sheet theory with a finite
world sheet cutoff. This is possible because there are an infinite number of
operators whose coefficients can be tuned. This is in the same sense that
"perfect actions" or "improved actions" have been proposed in lattice gauge
theory to reproduce the continuum results even while keeping a finite lattice
spacing.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 06:40:22 GMT"
}
] | 2008-11-26T00:00:00 | [
[
"Sathiapalan",
"B.",
""
]
] |
0705.3293 | Talvikki Hovatta | T. Hovatta, M. Tornikoski, M. Lainela, H. J. Lehto, E. Valtaoja, I.
Torniainen, M. F. Aller, H. D. Aller | Statistical analyses of long-term variability of AGN at high radio
frequencies | 19 pages, 12 figures, Accepted for publication in A&A | null | 10.1051/0004-6361:20077529 | null | astro-ph | null | We present a study of variability time scales in a large sample of Active
Galactic Nuclei at several frequencies between 4.8 and 230 GHz. We investigate
the differences of various AGN types and frequencies and correlate the measured
time scales with physical parameters such as the luminosity and the Lorentz
factor. Our sample consists of both high and low polarization quasars, BL
Lacertae objects and radio galaxies. The basis of this work is the 22 GHz, 37
GHz and 87 GHz monitoring data from the Metsahovi Radio Observatory spanning
over 25 years. In addition,we used higher 90 GHz and 230 GHz frequency data
obtained with the SEST-telescope between 1987 and 2003. Further lower frequency
data at 4.8 GHz, 8 GHz and 14.5 GHz from the University of Michigan monitoring
programme have been used. We have applied three different statistical methods
to study the time scales: The structure function, the discrete correlation
function and the Lomb-Scargle periodogram. We discuss also the differences and
relative merits of these three methods. Our study reveals that smaller flux
density variations occur in these sources on short time scales of 1-2 years,
but larger outbursts happen quite rarely, on the average only once in every 6
years. We do not find any significant differences in the time scales between
the source classes. The time scales are also only weakly related to the
luminosity suggesting that the shock formation is caused by jet instabilities
rather than the central black hole.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 06:53:06 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Hovatta",
"T.",
""
],
[
"Tornikoski",
"M.",
""
],
[
"Lainela",
"M.",
""
],
[
"Lehto",
"H. J.",
""
],
[
"Valtaoja",
"E.",
""
],
[
"Torniainen",
"I.",
""
],
[
"Aller",
"M. F.",
""
],
[
"Aller",
"H. D.",
""
]
] |
0705.3294 | Kevin Lin | Kevin K. Lin and Lai-Sang Young | Shear-Induced Chaos | null | null | 10.1088/0951-7715/21/5/002 | null | math.DS math-ph math.MP nlin.CD | null | Guided by a geometric understanding developed in earlier works of Wang and
Young, we carry out some numerical studies of shear-induced chaos. The settings
considered include periodic kicking of limit cycles, random kicks at Poisson
times, and continuous-time driving by white noise. The forcing of a
quasi-periodic model describing two coupled oscillators is also investigated.
In all cases, positive Lyapunov exponents are found in suitable parameter
ranges when the forcing is suitably directed.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 06:47:18 GMT"
}
] | 2009-11-13T00:00:00 | [
[
"Lin",
"Kevin K.",
""
],
[
"Young",
"Lai-Sang",
""
]
] |
0705.3295 | Jean-Noel Roux | Francisco Gilabert, Jean-Noel Roux (LMSGC), Antonio Castellanos | Computer simulation of model cohesive powders: influence of assembling
procedure and contact laws on low consolidation states | 31 pages Only 26 pages in the published PRE paper, but figures look
better in THIS version ! | Physical Review E: Statistical, Nonlinear, and Soft Matter Physics
75 (10/01/2007) 011303 | 10.1103/PhysRevE.75.011303 | null | cond-mat.dis-nn cond-mat.mtrl-sci | null | The structure and mechanical properties of a simple two-dimensional model of
a cohesive powder are investigated by molecular dynamics simulations.
Micromechanical ingredients involve elasticity, friction, a short range
attraction and, possibly, rolling resistance (RR) in contacts. The
microstructure of the cohesive packing varies according to the assembling
procedure, from rather densely packed if isolated particles are directly
compressed to much looser if the formation of large aggregates is allowed prior
to compression. A crucial parameter is the ratio P*= Pa/F0 of applied pressure
P, acting on grains of diameter $a$, to maximum tensile contact force F0. At
low P* the final structure depends on the level of velocity fluctuations at the
early stages of cluster aggregation. With RR the coordination number approaches
2 in the limit of low initial velocities or large rolling friction. The force
network generally comprises small hyperstatic clusters with forces of the order
of F0, joined by nearly unstressed, barely rigid arms. As P* grows, it quickly
rearranges into force chain-like patterns. Density correlations witness a
fractal structure, with dimension Df, up to some density-dependent blob size.
WIth RR Df coincides with the ballistic aggregation result, despite a possibly
different connectivity. Possible effects of some parameters on material
strength are evoked.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 06:56:17 GMT"
}
] | 2007-05-24T00:00:00 | [
[
"Gilabert",
"Francisco",
"",
"LMSGC"
],
[
"Roux",
"Jean-Noel",
"",
"LMSGC"
],
[
"Castellanos",
"Antonio",
""
]
] |
0705.3296 | Shuai Dong | Shuai Dong, Han Zhu, J.-M. Liu | Dielectrophoresis model for the colossal electroresistance of
phase-separated manganites | 4 pages, 5 figures | Physical Review B 76, 132409 (2007) | 10.1103/PhysRevB.76.132409 | null | cond-mat.str-el cond-mat.mtrl-sci | null | We propose a dielectrophoresis model for phase-separated manganites. Without
increase of the fraction of metallic phase, an insulator-metal transition
occurs when a uniform electric field applied across the system exceeds a
threshold value. Driven by the dielectrophoretic force, the metallic clusters
reconfigure themselves into stripes along the direction of electric field,
leading to the filamentous percolation. This process, which is time-dependent,
irreversible and anisotropic, is a probable origin of the colossal
electroresistance in manganites.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 12:58:18 GMT"
},
{
"version": "v2",
"created": "Sat, 1 Sep 2007 02:25:24 GMT"
}
] | 2007-10-26T00:00:00 | [
[
"Dong",
"Shuai",
""
],
[
"Zhu",
"Han",
""
],
[
"Liu",
"J. -M.",
""
]
] |
0705.3297 | Eliecer Hernandez-Gajate | D. Barquilla-Cano, A.J. Buchmann and E. Hernandez | Axial $N\to \Delta(1232)$ and $N \to N^{\star}(1440)$ transition form
factors | 28 latex pages, 9 figures, 6 tables. In Fig. 8 the curve labelled
"Total" has been corrected | Phys.Rev.C75:065203,2007; Erratum-ibid.C77:019903,2008 | 10.1103/PhysRevC.75.065203 10.1103/PhysRevC.77.019903 | null | nucl-th | null | We calculate the axial $N\to \Delta(1232)$ and $N\to N^{\star}(1440)$
transition form factors in a chiral constituent quark model. As required by the
partial conservation of axial current ($PCAC$) condition, we include one- and
two-body axial exchange currents. For the axial $N\to \Delta(1232)$ form
factors we compare with previous quark model calculations that use only
one-body axial currents, and with experimental analyses. The paper provides the
first calculation of all weak axial $N\to N^{\star}(1440)$ form factors. Our
main result is that exchange currents are very important for certain axial
transition form factors. In addition to improving our understanding of nucleon
structure, the present results are relevant for neutrino-nucleus scattering
cross section predictions needed in the analysis of neutrino mixing
experiments.
| [
{
"version": "v1",
"created": "Wed, 23 May 2007 07:24:03 GMT"
},
{
"version": "v2",
"created": "Tue, 26 Jun 2007 06:48:50 GMT"
},
{
"version": "v3",
"created": "Thu, 24 Jan 2008 08:29:47 GMT"
}
] | 2014-11-18T00:00:00 | [
[
"Barquilla-Cano",
"D.",
""
],
[
"Buchmann",
"A. J.",
""
],
[
"Hernandez",
"E.",
""
]
] |
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