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802.0603
Julien Bringer
Julien Bringer and Herve Chabanne
Trusted-HB: a low-cost version of HB+ secure against Man-in-The-Middle attacks
submitted to IEEE Transactions on Information Theory
IEEE Trans. IT. 54:9 (2008) 4339-4342
10.1109/TIT.2008.928290
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Since the introduction at Crypto'05 by Juels and Weis of the protocol HB+, a lightweight protocol secure against active attacks but only in a detection based-model, many works have tried to enhance its security. We propose here a new approach to achieve resistance against Man-in-The-Middle attacks. Our requirements - in terms of extra communications and hardware - are surprisingly low.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 20:39:03 GMT" } ]
2009-01-08T00:00:00
[ [ "Bringer", "Julien", "" ], [ "Chabanne", "Herve", "" ] ]
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802.0604
Amnon Aharony
A. B. Harris, Amnon Aharony and Ora Entin-Wohlman
Order Parameters and Phase Diagram of Multiferroic RMn$_2$O$_5$
null
Phys. Rev. Lett. 100, 217202 (2008)
10.1103/PhysRevLett.100.217202
null
cond-mat.mtrl-sci cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The generic magnetic phase diagram of multiferroic RMn$_2$O$_5$ (with R=Y, Ho, Tb, Er, Tm), which allows different sequences of ordered magnetic structures for different R's and different control parameters, is described using order parameters which explicitly incorporate the magnetic symmetry. A phenomenological magneto-electric coupling is used to explain why some of these magnetic phases are also ferroelectric. Several new experiments, which can test this theory, are proposed.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 12:34:47 GMT" }, { "version": "v2", "created": "Fri, 6 Jun 2008 06:54:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Harris", "A. B.", "" ], [ "Aharony", "Amnon", "" ], [ "Entin-Wohlman", "Ora", "" ] ]
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802.0605
Fleurov Victor
O.V. Farberovich, A. Yaresko, K. Kikoin and V. Fleurov
Electronic structure of noble metal impurities in semiconductors: Cu in GaP
6 figures
null
10.1103/PhysRevB.78.085206
null
cond-mat.other cond-mat.str-el
null
A numerical method for calculation of the electronic structure of transition metal impurities in semiconductors based on the Green function technique is developed. The electronic structure of 3d impurity is calculated within the LDA+U version of density functional method, whereas the host electron Green function is calculated by using the linearized augmented plane wave expansion. The method is applied to the Cu impurity in GaP. The results of calculations are compared with those obtained within the supercell LDA procedure. It is shown that in the Green function approach Cu impurity has an unfilled 3d shell. This result paves a way to explanation of the magnetic order in dilute Ga_{1-x}Cu_xP alloys.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:28:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Farberovich", "O. V.", "" ], [ "Yaresko", "A.", "" ], [ "Kikoin", "K.", "" ], [ "Fleurov", "V.", "" ] ]
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802.0606
Michael J. W. Hall
Michael J. W. Hall
Complete positivity for time-dependent qubit master equations
Additional example and ref; to appear in J. Phys. A
J. Phys. A: Math. Theor. 41 (2008) 205302
10.1088/1751-8121/41/26/269801
null
quant-ph
null
It is shown that if the decoherence matrix corresponding to a qubit master equation has a block-diagonal real part, then the evolution is determined by a one-dimensional oscillator equation. Further, when the full decoherence matrix is block-diagonal, then the necessary and sufficient conditions for completely positive evolution may be formulated in terms of the oscillator Hamiltonian or Lagrangian. When the solution of the oscillator equation is not known, an explicit sufficient condition for complete positivity can still be obtained, based on a Hamiltonian/Lagrangian inequality. A rotational form-invariance property is used to characterise the evolution via a single first-order nonlinear differential equation, enabling some further exact results to be obtained. A class of master equations is identified for which complete positivity reduces to the simpler condition of positivity.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 19:17:44 GMT" }, { "version": "v2", "created": "Sat, 29 Mar 2008 02:40:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Hall", "Michael J. W.", "" ] ]
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802.0607
Enrico Calzavarini
Enrico Calzavarini, Massimo Cencini, Detlef Lohse, and Federico Toschi
Quantifying turbulence induced segregation of inertial particles
4 pages, 5 figures
Phys. Rev. Lett. 101, 084504 (2008)
10.1103/PhysRevLett.101.084504
null
nlin.CD physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Particles with density different from that of the advecting turbulent fluid cluster due to the different response of light/heavy particles to turbulent fluctuations. This study focuses on the quantitative characterization of the segregation of dilute poly-disperse inertial particles evolving in turbulent flow, as obtained from Direct Numerical Simulation of the Navier-Stokes equations. We introduce an indicator of segregation amongst particles of different inertia and/or size, from which a length scale r_{seg} quantifying the degree of segregation of two different types of particles is deduced.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:01:55 GMT" }, { "version": "v2", "created": "Thu, 28 Aug 2008 09:00:26 GMT" } ]
2008-08-28T00:00:00
[ [ "Calzavarini", "Enrico", "" ], [ "Cencini", "Massimo", "" ], [ "Lohse", "Detlef", "" ], [ "Toschi", "Federico", "" ] ]
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802.0608
Jerzy Blawzdziewicz
S. Bhattacharya (Texas Tech University), J. Blawzdziewicz (Yale University)
Effect of small particles on the near-wall dynamics of a large particle in a highly bidisperse colloidal solution
11 pages, 5 figures
null
10.1063/1.2917339
null
cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the hydrodynamic effect of small particles on the dynamics of a much larger particle moving normal to a planar wall in a highly bidisperse dilute colloidal suspension of spheres. The gap $h_0$ between the large particle and the wall is assumed to be comparable to the diameter $2a$ of the smaller particles so there is a length-scale separation between the gap width $h_0$ and the radius of the large particle $b<<h_0$. We use this length-scale separation to develop a new lubrication theory which takes into account the presence of the smaller particles in the space between the larger particle and the wall. The hydrodynamic effect of the small particles on the motion of the large particle is characterized by the short time (or high frequency) resistance coefficient. We find that for small particle-wall separations $h_0$, the resistance coefficient tends to the asymptotic value corresponding to the large particle moving in a clear suspending fluid. For $h_0<<a$, the resistance coefficient approaches the lubrication value corresponding to a particle moving in a fluid with the effective viscosity given by the Einstein formula.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:03:03 GMT" } ]
2009-11-13T00:00:00
[ [ "Bhattacharya", "S.", "", "Texas Tech University" ], [ "Blawzdziewicz", "J.", "", "Yale\n University" ] ]
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802.0609
Henri Gouin
Sergey Gavrilyuk, Henri Gouin (MSNMGP, LMMT), Yurii Perepechko
A variational principle for two-fluid models
7 pages
Comptes Rendus de l Acad\'emie des Sciences - Series IIB - Mechanics-Physics-Astronomy 324, 8 (1997) 483-490
10.1016/S1251-8069(97)80186-8
null
physics.class-ph math-ph math.MP
null
A variational principle for two-fluid mixtures is proposed. The Lagrangian is constructed as the difference between the kinetic energy of the mixture and a thermodynamic potential conjugated to the internal energy with respect to the relative velocity of phases. The equations of motion and a set of Rankine-Hugoniot conditions are obtained. It is proved also that the convexity of the internal energy guarantees the hyperbolicity of the one-dimensional equations of motion linearized at rest.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:12:43 GMT" } ]
2008-02-06T00:00:00
[ [ "Gavrilyuk", "Sergey", "", "MSNMGP, LMMT" ], [ "Gouin", "Henri", "", "MSNMGP, LMMT" ], [ "Perepechko", "Yurii", "" ] ]
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802.061
Lorenzo Morelli
L. Morelli (1), E. Pompei (2), A. Pizzella (1), J. M\'endez-Abreu (1),(3), E. M. Corsini (1), L. Coccato (4), R. P. Saglia (4), M. Sarzi (5) and F. Bertola (1) ((1) Dipartimento di Astronomia, Universit\`a di Padova, (2) European Southern Observatory, (3) INAF-Osservatorio Astronomico di Padova, (4) Max-Planck Institut f\"ur extraterrestrische Physik, (6) Centre for Astrophysics Research, University of Hertfordshire)
The pseudobulge of NGC 1292
2 pages, 1 figure to appear in the proceedings of "Formation and Evolution of Galaxy Disks", Rome, October 2007, Eds. J. Funes and E. M. Corsini
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The photometric and kinematic properties of Sb NGC 1292 suggest it hosts a pseudobulge. The properties of the stellar population of such a pseudobulge are consistent with a slow buildup within a scenario of secular evolution.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:14:14 GMT" } ]
2008-02-06T00:00:00
[ [ "Morelli", "L.", "" ], [ "Pompei", "E.", "" ], [ "Pizzella", "A.", "" ], [ "Méndez-Abreu", "J.", "" ], [ "Corsini", "E. M.", "" ], [ "Coccato", "L.", "" ], [ "Saglia", "R. P.", "" ], [ "Sarzi", "M.", "" ], [ "Bertola", "F.", "" ] ]
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802.0611
Denis Burgarella
D. Burgarella, B. Le Roux, M. Langlois, G. Moretto, T. Fusco, M. Ferrari
The Wide-field High-resolution Infrared TElescope (WHITE)
Invited talk to the 2nd ARENA Conference : "The Astrophysical Science Cases at Dome C" Potsdam 17-21 September, 2007
null
10.1117/12.789077
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Wide-field High-resolution Infrared TElescope (WHITE) will be dedicated in the first years of its life to carrying out a few (well focused in terms of science objectives and time) legacy surveys. WHITE would have an angular resolution of ~0.3'' homogeneous over ~0.7 sq. deg. in the wavelength range 1 - 5 um, which means that we will very efficiently use all the available observational time during night time and day time. Moreover, the deepest observations will be performed by summing up shorter individual frames. We will have a temporal information that can be used to study variable objects. The three key science objectives of WHITE are : 1) A complete survey of the Magellanic Clouds to make a complete census of young stellar objects in the clouds and in the bridge and to study their star formation history and the link with the Milky Way. The interaction of the two clouds with our Galaxy might the closest example of a minor merging event that could be the main driver of galaxy evolution in the last 5 Gyrs. 2) The building of the first sample of dusty supernovae at z<1.2 in the near infrared range (1-5 um) to constrain the equation of state from these obscured objects, study the formation of dust in galaxies and build the first high resolution sample of high redshift galaxies observed in their optical frame 3) A very wide weak lensing survey over that would allow to estimate the equation of state in a way that would favourably compete with space projects.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:19:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Burgarella", "D.", "" ], [ "Roux", "B. Le", "" ], [ "Langlois", "M.", "" ], [ "Moretto", "G.", "" ], [ "Fusco", "T.", "" ], [ "Ferrari", "M.", "" ] ]
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802.0612
Boris Pasquier
Boris Pasquier
The pseudo-index of horospherical Fano varieties
9 pages
null
null
null
math.AG
null
We prove a conjecture of L.Bonavero, C. Casagrande, O. Debarre and S. Druel, on the pseudo-index of smooth Fano varieties, in the special case of horospherical varieties.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:02:21 GMT" } ]
2008-02-06T00:00:00
[ [ "Pasquier", "Boris", "" ] ]
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802.0613
Alexandre Matzkin
A. Matzkin
Is Bell's theorem relevant to quantum mechanics? On locality and non-commuting observables
Extended with new material
AIP Conf Proc 1101, 339 (2009)
10.1063/1.3109959
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bell's theorem is a statement by which averages obtained from specific types of statistical distributions must conform to a family of inequalities. These models, in accordance with the EPR argument, provide for the simultaneous existence of quantum mechanically incompatible quantities. We first recall several contradictions arising between the assumption of a joint distribution for incompatible observables and the probability structure of quantum-mechanics, and conclude that Bell's theorem is not expected to be relevant to quantum phenomena described by non-commuting observables, irrespective of the issue of locality. Then, we try to disentangle the locality issue from the existence of joint distributions by introducing two models accounting for the EPR correlations but denying the existence of joint distributions. We will see that these models do not need to resort explicitly to non-locality: the first model relies on conservation laws for ensembles, and the second model on an equivalence class by which different configurations lead to the same physical predictions.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:28:02 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 09:44:05 GMT" }, { "version": "v3", "created": "Mon, 12 Jan 2009 15:12:50 GMT" } ]
2009-04-13T00:00:00
[ [ "Matzkin", "A.", "" ] ]
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802.0614
Ivan Melo
M. Gintner, I. Melo, B. Trpisova
Signatures of Strong Electroweak Symmetry Breaking in pp -> b \bar{b} t \bar{t} + X at LHC
3 pages, 3 figures, submitted to the Proceedings of the 16th Conference of the Slovak Physicists, Sep 10-13, 2007, Zilina, Slovakia. (The reason for the replacement: In the original submission the year of the Conference was mistyped.)
null
null
null
hep-ph
null
We study the possible production of the $\rho$-resonance from the Strong Electroweak Symmetry Breaking sector at LHC. Due to possibly enhanced couplings of $\rho$ to the top and bottom quarks we focus on the process pp -> b \bar{b} t \bar{t} where either b \bar{b} or t \bar{t} are the products of the $\rho$ decay.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:14:22 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 11:03:38 GMT" } ]
2008-02-06T00:00:00
[ [ "Gintner", "M.", "" ], [ "Melo", "I.", "" ], [ "Trpisova", "B.", "" ] ]
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802.0615
Elvan Ceyhan
E. Ceyhan, C. E. Priebe, D. J. Marchette
A New Family of Random Graphs for Testing Spatial Segregation
31 pages, 15 figures
Canadian Journal of Statistics (2007), 35(1):27-50
null
null
stat.ME math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss a graph-based approach for testing spatial point patterns. This approach falls under the category of data-random graphs, which have been introduced and used for statistical pattern recognition in recent years. Our goal is to test complete spatial randomness against segregation and association between two or more classes of points. To attain this goal, we use a particular type of parametrized random digraph called proximity catch digraph (PCD) which is based based on relative positions of the data points from various classes. The statistic we employ is the relative density of the PCD. When scaled properly, the relative density of the PCD is a $U$-statistic. We derive the asymptotic distribution of the relative density, using the standard central limit theory of $U$-statistics. The finite sample performance of the test statistic is evaluated by Monte Carlo simulations, and the asymptotic performance is assessed via Pitman's asymptotic efficiency, thereby yielding the optimal parameters for testing. Furthermore, the methodology discussed in this article is also valid for data in multiple dimensions.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:34:46 GMT" } ]
2008-02-06T00:00:00
[ [ "Ceyhan", "E.", "" ], [ "Priebe", "C. E.", "" ], [ "Marchette", "D. J.", "" ] ]
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802.0616
Guangyan Jia
Guangyan Jia
A uniqueness theorem for solution of BSDEs
null
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this note, we prove that if $g$ is uniformly continuous in $z$, uniformly with respect to $(\oo,t)$ and independent of $y$, the solution to the backward stochastic differential equation (BSDE) with generator $g$ is unique.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:44:14 GMT" } ]
2008-02-06T00:00:00
[ [ "Jia", "Guangyan", "" ] ]
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802.0617
Elvan Ceyhan
E. Ceyhan, C. E. Priebe
On the Distribution of the Domination Number of a New Family of Parametrized Random Digraphs
24 pages, 14 figures
Model Assisted Statistics and Applications (2007), 1(4):231-255
null
null
math.CO math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the asymptotic distribution of the domination number of a new family of random digraph called proximity catch digraph (PCD), which has application to statistical testing of spatial point patterns and to pattern recognition. The PCD we use is a parametrized digraph based on two sets of points on the plane, where sample size and locations of the elements of one is held fixed, while the sample size of the other whose elements are randomly distributed over a region of interest goes to infinity. PCDs are constructed based on the relative allocation of the random set of points with respect to the Delaunay triangulation of the other set whose size and locations are fixed. We introduce various auxiliary tools and concepts for the derivation of the asymptotic distribution. We investigate these concepts in one Delaunay triangle on the plane, and then extend them to the multiple triangle case. The methods are illustrated for planar data, but are applicable in higher dimensions also.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:50:56 GMT" } ]
2008-02-06T00:00:00
[ [ "Ceyhan", "E.", "" ], [ "Priebe", "C. E.", "" ] ]
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802.0618
Massimiliano Rinaldi
Massimiliano Rinaldi
Superluminal dispersion relations and the Unruh effect
Final discussion expanded, references added. Version accepted for publication in Phys Rev D
Phys.Rev.D77:124029,2008
10.1103/PhysRevD.77.124029
null
gr-qc hep-th
null
In the context of quantum gravity phenomenology, we study the Unruh effect in the presence of superluminal dispersion relations. In particular, we estimate the response function and the probability rate for an accelerated detector coupled to a massless scalar field, whose dispersion relation becomes essentially quadratic beyond a threshold momentum $k_p$. By means of perturbative analysis, we show that superluminal dispersion induces a correction to the Planckian spectrum, which tends to vanish as $k_p$ increases.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:52:38 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 15:57:22 GMT" }, { "version": "v3", "created": "Mon, 26 May 2008 16:11:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Rinaldi", "Massimiliano", "" ] ]
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802.0619
Leonid Fel
Leonid G. Fel
On Summatory Totient Functions
9 pages
null
null
null
math.NT
null
The lower and upper bounds are found for the leading term of summatory totient function $\sum_{k\leq N}k^u\phi^v(k)$ in various ranges of $u\in{\mathbb R}$ and $v\in{\mathbb Z}$.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 13:59:00 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 17:53:01 GMT" } ]
2008-02-11T00:00:00
[ [ "Fel", "Leonid G.", "" ] ]
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802.062
Mami Hamasaki
Mami Hamasaki
Formalism of Nonequilibrium Perturbation Theory and Kondo Effect
Extended version of cond-mat/0506752
null
null
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The formalism of nonequilibrium perturbation theory was constructed by Schwinger and Keldysh and then was developed with the diagrammatical technique by Lifshitz and Pitaevskii. Until now there has been widespread application to various researches in physics, condensed matter, plasmas, atoms and molecules, nuclear matter etc.. In spite of this, the formalism has not been established as perturbation theory. For example, there is no perturbative method to derive arbitrary self-energy properly. In addition, the connection with other formalism, e.g., the Matsubara imaginary-time perturbative formalism is uncertain. Although there must be the relationship between self-energies in the perturbative formalism, such basic problems remain to be solved. The solution is given by the present work. The real-time perturbative expansion is performed on the basis of the adiabatic theorem. As the results, the requirements of self-energies as functions in time are demonstrated and the formulated self-energies meet the known relations. Besides, it gives exact agreement with functions derived by perturbative expansion in imaginary-time and analytical continuity. As a consequence, it implies that the present formalism can be generalized.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:09:27 GMT" } ]
2008-02-06T00:00:00
[ [ "Hamasaki", "Mami", "" ] ]
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802.0621
Jana Ka\v{s}parov\'a
J. C. Brown, J. Kasparova, A. M. Massone, M. Piana
Fast Spectral Fitting of Hard X-Ray Bremsstrahlung from Truncated Power-Law Electron Spectra
7 pages, 4 figures, submitted to Astronomy and Astrophysics
Astron.Astrophys.486:1023-1029,2008
10.1051/0004-6361:200809496
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hard X-Ray bremsstrahlung continuum spectra, such as from solar flares, are commonly described in terms of power-law fits, either to the photon spectra themselves or to the electron spectra responsible for them. In applications various approximate relations between electron and photon spectral indices are often used for energies both above and below electron low-energy cutoffs. We examine the form of the exact relationships in various situations, and for various cross-sections, showing that empirical relations sometimes used can be highly misleading and consider how to improve fitting procedures. We obtain expressions for photon spectra from single, double and truncated power-law electron spectra for a variety of cross-sections and for the thin and thick target models and simple analytic expressions for the Bethe-Heitler cases. We show that above a low-energy cutoff the Kramers and Bethe-Heitler results match reasonably well with results for exact cross-sections up to energies around 100 keV; that below the low-energy cutoff, Kramers and other constant spectral index forms commonly used are very poor approximations to accurate results; but that our analytical forms are a very good match. Analytical forms of the Bethe-Heitler photon spectra from general power-law electron spectra are an excellent match to exact results for both thin and thick targets and they enable much faster spectral fitting than evaluation of the full spectral integrations.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:17:12 GMT" } ]
2009-02-20T00:00:00
[ [ "Brown", "J. C.", "" ], [ "Kasparova", "J.", "" ], [ "Massone", "A. M.", "" ], [ "Piana", "M.", "" ] ]
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802.0622
Elvan Ceyhan
E. Ceyhan, C. E. Priebe, J. C.Wierman
Relative Density of the Random $r$-Factor Proximity Catch Digraph for Testing Spatial Patterns of Segregation and Association
29 pages, 21 figures
Computational Statistics & Data Analysis (2006), 50(8):1925-1964
null
null
stat.ME math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Statistical pattern classification methods based on data-random graphs were introduced recently. In this approach, a random directed graph is constructed from the data using the relative positions of the data points from various classes. Different random graphs result from different definitions of the proximity region associated with each data point and different graph statistics can be employed for data reduction. The approach used in this article is based on a parameterized family of proximity maps determining an associated family of data-random digraphs. The relative arc density of the digraph is used as the summary statistic, providing an alternative to the domination number employed previously. An important advantage of the relative arc density is that, properly re-scaled, it is a $U$-statistic, facilitating analytic study of its asymptotic distribution using standard $U$-statistic central limit theory. The approach is illustrated with an application to the testing of spatial patterns of segregation and association. Knowledge of the asymptotic distribution allows evaluation of the Pitman and Hodges-Lehmann asymptotic efficacies, and selection of the proximity map parameter to optimize efficiency. Furthermore the approach presented here also has the advantage of validity for data in any dimension.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:17:29 GMT" } ]
2008-02-06T00:00:00
[ [ "Ceyhan", "E.", "" ], [ "Priebe", "C. E.", "" ], [ "Wierman", "J. C.", "" ] ]
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802.0623
Daniel Wohns
Daniel Wohns
Hawking-Moss Tunneling with a Dirac-Born-Infeld Action
4 pages, version accepted in Phys. Rev. D., additional references and example application
Phys.Rev.D78:107702,2008
10.1103/PhysRevD.78.107702
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Hawking-Moss tunneling rate for a field described by the Dirac-Born-Infeld action is calculated using a stochastic approach. We find that the effect of the non-trivial kinetic term is to enhance the tunneling rate, which can be exponentially significant. This result should be compared to the DBI enhancement found in the Coleman-de Luccia case.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:20:02 GMT" }, { "version": "v2", "created": "Tue, 4 Nov 2008 21:40:52 GMT" } ]
2009-02-23T00:00:00
[ [ "Wohns", "Daniel", "" ] ]
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802.0624
Andreas Fring
Andreas Fring and Miloslav Znojil
PT-symmetric deformations of Calogero models
19 pages, 2 figures, version acepted for publication
J.Phys.A41:194010,2008
10.1088/1751-8113/41/19/194010
CMS 01/08
quant-ph hep-th math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate that Coxeter groups allow for complex PT-symmetric deformations across the boundaries of all Weyl chambers. We compute the explicit deformations for the A_2 and G_2-Coxeter group and apply these constructions to Calogero-Moser-Sutherland models invariant under the extended Coxeter groups. The eigenspecta for the deformed models are real and contain the spectra of the undeformed case as subsystem.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 20:18:17 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 16:19:55 GMT" } ]
2009-10-02T00:00:00
[ [ "Fring", "Andreas", "" ], [ "Znojil", "Miloslav", "" ] ]
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802.0625
Aleksey Zakharenko
Aleksey A. Zakharenko, S. Karthikyan, K.S. Kim
Ab Initio Study of Different Acid Molecules Interacting with H2O
22 pages, 2 figs, 2 tables, 90 references
null
null
null
physics.chem-ph physics.atm-clus physics.bio-ph physics.comp-ph physics.med-ph physics.space-ph
http://creativecommons.org/licenses/publicdomain/
Using the Gaussian-03 for ab initio calculations, we have studied interaction of different acid molecules with a single water molecule. The molecular and supermolecular optimized structures were found with the Becke-3-Lee-Yang-Parr (B3LYP-hybrid potential) calculations of density-functional theory (DFT) methods as well as the Moeller-Plesset second-order perturbation theory, using the basis set of Aug-cc-pVDZ quality and the CRENBL ECP effective core potential for molecules containing heavy iodine atom. Possible isomers of studied acids and supermolecules, consisting of acid molecules coupled with a single water molecule, are shown. Energies, zero-point energies (ZPEs), thermal enthalpies and free energies, as well as the corresponding binding energies for the theoretical methods were calculated. It was found that optimized structures of supermolecular isomers with lowest energies corresponding to the global minimum on the potential energy surfaces can be different for both theories. The simplest structure acids H2S and H2Se, forming acid-water supermolecules, can give clear evidence of disagreement of the two theoretical methods concerning optimization of lowest energy structures, because the B3LYP-DFT method gives the lowest-energy structure for the first supermolecular isomer, but the MP2 method for the second possible isomer. A dramatic difference between potential energy surfaces for both theories applying to the optimized structure finding of the H2SO3-H2O supermolecular isomers was found, because MP2 supermolecular geometries cannot exist for the corresponding B3LYP-DFT ones, for which the frequency characteristics of the supermolecular isomers were also calculated. In general, the binding energies and ZPE ones for the MP2 method are 10-15% larger than those for the B3LYP-DFT method.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 02:42:25 GMT" } ]
2016-09-08T00:00:00
[ [ "Zakharenko", "Aleksey A.", "" ], [ "Karthikyan", "S.", "" ], [ "Kim", "K. S.", "" ] ]
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802.0626
Stephen Spratlin Bullock
Stephen S. Bullock and Dianne P. O'Leary
Bounds on Effective Hamiltonians for Stabilizer Codes
12 pages, two algorithms, one figure, to be submitted to QIC
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This manuscript introduces various notions of k-locality of stabilizer codes inherited from the associated stabilizer groups. A choice of generators for the group leads to a Hamiltonian with the code in its groundspace, while a Hamiltonian holding the code in its groundspace might be called effective if its locality is less than that of a natural choice of generators (or any choice). This paper establishes some conditions under which effective Hamiltonians for stabilizer codes do not exist. Our results simplify in the cases of Calderbank-Shor-Steane stabilizer codes and topologically-ordered stabilizer codes arising from surface cellulations.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:24:56 GMT" } ]
2008-02-06T00:00:00
[ [ "Bullock", "Stephen S.", "" ], [ "O'Leary", "Dianne P.", "" ] ]
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802.0627
Friedrich Konrad Roepke
F. K. Roepke (MPA Garching)
Numerical simulations of multi-scale astrophysical problems: The example of Type Ia supernovae
10 pages, 1 figure; in "Modelling and Simulation in Science", Proceedings of the 6th International Workshop on Data Analysis in Astronomy "Livio Scarsi", Erice, Italy 15 - 22 April 2007 (World Scientific, 2008)
null
null
null
astro-ph
null
Vastly different time and length scales are a common problem in numerical simulations of astrophysical phenomena. Here, we present an approach to numerical modeling of such objects on the example of Type Ia supernova simulations. The evolution towards the explosion proceeds on much longer time scales than the explosion process itself. The physical length scales relevant in the explosion process cover 11 orders of magnitude and turbulent effects dominate the physical mechanism. Despite these challenges, three-dimensional simulations of Type Ia supernova explosions have recently become possible and pave the way to a better understanding of these important astrophysical objects.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:36:35 GMT" } ]
2008-02-06T00:00:00
[ [ "Roepke", "F. K.", "", "MPA Garching" ] ]
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802.0628
Andras I. Stipsicz
Paolo Lisca, Peter Ozsv\'ath, Andr\'as I. Stipsicz and Zolt\'an Szab\'o
Heegaard Floer invariants of Legendrian knots in contact three--manifolds
70 pages, 30 figures
null
null
null
math.SG math.GT
http://creativecommons.org/licenses/publicdomain/
We define invariants of null--homologous Legendrian and transverse knots in contact 3--manifolds. The invariants are determined by elements of the knot Floer homology of the underlying smooth knot. We compute these invariants, and show that they do not vanish for certain non--loose knots in overtwisted 3--spheres. Moreover, we apply the invariants to find transversely non--simple knot types in many overtwisted contact 3--manifolds.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:33:04 GMT" }, { "version": "v2", "created": "Tue, 21 Apr 2009 11:12:44 GMT" } ]
2009-04-21T00:00:00
[ [ "Lisca", "Paolo", "" ], [ "Ozsváth", "Peter", "" ], [ "Stipsicz", "András I.", "" ], [ "Szabó", "Zoltán", "" ] ]
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802.0629
Christian Martin
C. A. Martin, D. Ding, H. S. J. van der Zant, J. M. van Ruitenbeek
Lithographic mechanical break junctions for single-molecule measurements in vacuum: possibilities and limitations
19 pages, 6 figures; v2: changed wrongly given HDA peak position in abstract to correct value, removed typing mistakes; v3: added three plots, improved discussion, removed typos
New J. Phys. 10 (2008) 065008
10.1088/1367-2630/10/6/065008
null
cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have investigated electrical transport through the molecular model systems benzenedithiol, benzenediamine, hexanedithiol and hexanediamine. Conductance histograms under different experimental conditions indicate that measurements using mechanically controllable break junctions in vacuum are limited by the surface density of molecules at the contact. Hexanedithiol histograms typically exhibit a broad peak around 7 * 10^{-4} G_0. In contrast to recent results on STM-based break junctions in solution we find that the spread in single-molecule conductance is not reduced by amino anchoring groups. Histograms of hexanediamine exhibit a very wide peak around 4 * 10^{-4} G_0. For both benzenedithiol and benzenediamine we observe a large variability in low-bias conductance. We attribute these features to the slow breaking of the lithographic mechanically controllable break junctions and the absence of a solvent that may enable molecular readsorption after bond breaking. Nevertheless, we have been able to acquire reproducible current-voltage characteristics of benzenediamine and benzenedithiol using a statistical measurement approach. Benzenedithiol measurements yield a conductance gap of about 0.9 V at room temperature and 0.6 V at 77 K. In contrast, the current-voltage characteristics of benzenediamine-junctions typically display conductance gaps of about 0.9 V at both temperatures.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:07:56 GMT" }, { "version": "v2", "created": "Wed, 6 Feb 2008 10:21:09 GMT" }, { "version": "v3", "created": "Tue, 1 Jul 2008 12:19:24 GMT" } ]
2008-07-01T00:00:00
[ [ "Martin", "C. A.", "" ], [ "Ding", "D.", "" ], [ "van der Zant", "H. S. J.", "" ], [ "van Ruitenbeek", "J. M.", "" ] ]
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802.063
Stefan Maubach
Stefan Maubach
A problem on polynomial maps over finite fields
6 pages;
null
null
null
math.CO math.AC math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is a short note that explains a problem on polynomial maps over finite fields for non-experts. The problem is: Do there exist odd polynomial automorphisms over the finite fields with 4,8,16,32,64,... elements? The explanation is very, very basic. Also, the background of the problem is given, and why it is of such importance. This all with the idea that the problem enters the world of discrete mathematics, and can be approached from completely different angles than normally used by people working in Affine Algebraic Geometry.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:42:31 GMT" } ]
2008-02-06T00:00:00
[ [ "Maubach", "Stefan", "" ] ]
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802.0631
Spalek
J. Spa{\l}ek, A. Koz{\l}owski, Z. Tarnawski, Z. K\c{a}kol, Y. Fukami, F. Ono, R. Zach, L. J. Spalek
Verwey transition in Fe$_{3}$O$_{4}$ at high pressure: quantum critical behavior at the onset of metallization
5 pages, 5 figures
null
10.1103/PhysRevB.78.100401
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide evidence for the existence of a {\em quantum critical point} at the metallization of magnetite Fe$_{3}$O$_{4}$ at an applied pressure of $p_{c} \approx 8$ GPa. We show that the present ac magnetic susceptibility data support earlier resistivity data. The Verwey temperature scales with pressure $T_{V}\sim (1-p/p_{c})^{\nu}$, with $\nu\sim 1/3$. The resistivity data shows a temperature dependence $\rho(T)=\rho_{0}+AT^{n}$, with $n\simeq 3$ above and 2.5 at the critical pressure, respectively. This difference in $n$ with pressure is a sign of critical behavior at $p_{c}$. The magnetic susceptibility is smooth near the critical pressure, both at the Verwey transition and near the ferroelectric anomaly. A comparison with the critical behavior observed in the Mott-Hubbard and related systems is made.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:42:49 GMT" } ]
2016-08-17T00:00:00
[ [ "Spałek", "J.", "" ], [ "Kozłowski", "A.", "" ], [ "Tarnawski", "Z.", "" ], [ "Kcakol", "Z.", "" ], [ "Fukami", "Y.", "" ], [ "Ono", "F.", "" ], [ "Zach", "R.", "" ], [ "Spalek", "L. J.", "" ] ]
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802.0632
Vasudevarao Allu
S. Ponnusamy (IIT Madras, India), A. Vasudevarao (IIT Madras, India) and M. Vuorinen (University of Turku, Finland)
Region of variability for certain classes of univalent functions satisfying differential inequalities
24 pages, 5 figures
null
null
null
math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we determine the region of variability for certain subclasses of univalent functions satisfying differential inequalities. In the final section we graphically illustrate the region of variability for several sets of parameters.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 14:49:52 GMT" }, { "version": "v2", "created": "Fri, 5 Dec 2008 16:32:01 GMT" }, { "version": "v3", "created": "Thu, 30 Jul 2009 17:30:54 GMT" } ]
2009-07-30T00:00:00
[ [ "Ponnusamy", "S.", "", "IIT Madras, India" ], [ "Vasudevarao", "A.", "", "IIT Madras, India" ], [ "Vuorinen", "M.", "", "University of Turku, Finland" ] ]
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802.0633
Pablo Groisman
Juli\'an Fern\'andez Bonder, Pablo Groisman
Time--space white noise eliminates global solutions in reaction diffusion equations
New results included. To be published in Physica D
null
10.1016/j.physd.2008.09.005
null
math.AP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that perturbing the reaction--diffusion equation $u_t=u_{xx} + (u_+)^p$ ($p>1$), with time--space white noise produces that solutions explodes with probability one for every initial datum, opposite to the deterministic model where a positive stationary solution exists.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:25:42 GMT" }, { "version": "v2", "created": "Mon, 10 Nov 2008 16:46:22 GMT" } ]
2008-11-10T00:00:00
[ [ "Bonder", "Julián Fernández", "" ], [ "Groisman", "Pablo", "" ] ]
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802.0634
Adel Bilal
Adel Bilal
Lectures on Anomalies
108 pages, 10 figures
null
null
LPTENS-08/05
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These lectures on anomalies are relatively self-contained and intended for graduate students who are familiar with the basics of quantum field theory. We begin with several derivations of the abelian anomaly: anomalous transformation of the measure, explicit computation of the triangle Feynman diagram, relation to the index of the Euclidean Dirac operator. The chiral (non-abelian) gauge anomaly is derived by evaluating the anomalous triangle diagram with three non-abelian gauge fields coupled to a chiral fermion. We discuss in detail the relation between anomaly, current non-conservation and non-invariance of the effective action, with special emphasis on the derivation of the anomalous Slavnov-Taylor/Ward identities. We show why anomalies always are finite and local. A general characterization is given of gauge groups and fermion representations which may lead to anomalies in four dimensions, and the issue of anomaly cancellation is discussed, in particular the classical example of the standard model. Then, we move to more formal developments and arbitrary even dimensions. After introducing a few basic notions of differential geometry, in particular characteristic classes, we derive the descent equations. We prove the Wess-Zumino consistency condition and show that relevant anomalies correspond to BRST cohomologies at ghost number one. We discuss why and how anomalies are related to characteristic classes in two more dimensions and outline their computation in terms of the index of an appropriate Dirac operator. Finally we derive the gauge and gravitational anomalies in arbitrary even dimensions from the appropriate index and explain the anomaly cancellations in ten-dimensional IIB supergravity and in type I and heterotic superstrings.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:00:20 GMT" } ]
2008-02-06T00:00:00
[ [ "Bilal", "Adel", "" ] ]
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802.0635
Filippo Viviani
Sergey Gorchinskiy and Filippo Viviani
A note on families of hyperelliptic curves
8 pages; final version, to appear on Arch. Math
Arch. Math. 92 (2009), 119-128
null
null
math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a stack-theoretic proof for some results on families of hyperelliptic curves.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:05:00 GMT" }, { "version": "v2", "created": "Fri, 19 Sep 2008 20:41:26 GMT" } ]
2009-04-15T00:00:00
[ [ "Gorchinskiy", "Sergey", "" ], [ "Viviani", "Filippo", "" ] ]
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802.0636
Bernard Segard
Bruno Macke (PhLAM), Bernard S\'egard (PhLAM)
Slow light in saturable absorbers
null
Physical Review A: Atomic, Molecular and Optical Physics 78, 1 (2008) 013817
10.1103/PhysRevA.78.013817
null
physics.optics
null
In connection with the experiments recently achieved on doped crystals, biological samples, doped optical fibers and semiconductor heterostructures, we revisit the theory of the propagation of a pulse-modulated light in a saturable absorber. Explicit analytical expressions of the transmitted pulse are obtained, enabling us to determine the parameters optimizing the time-delay of the transmitted pulse with respect to the incident pulse. We finally compare the maximum fractional delay or figure of merit so attainable to those which have been actually demonstrated in the experiments.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:12:09 GMT" }, { "version": "v2", "created": "Wed, 18 Jun 2008 13:18:02 GMT" } ]
2008-07-11T00:00:00
[ [ "Macke", "Bruno", "", "PhLAM" ], [ "Ségard", "Bernard", "", "PhLAM" ] ]
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802.0637
Plyatsko Roman
Roman Plyatsko
Highly Relativistic Motions of Spinning Particles According to Mathisson Equations
6 pages, invited paper presented at the Mathisson Conference (17-20 October2007, Warsaw), to appear in Acta Phys. Pol. B
Acta Phys.Polon.Supp.1:173-178,2008
null
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The physical effects following from the Mathisson equations at the highly relativistic motions of a spinning test particle relative to a Schwarzschild mass are discussed. The corresponding numerical estimates are presented.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:21:55 GMT" } ]
2009-02-10T00:00:00
[ [ "Plyatsko", "Roman", "" ] ]
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802.0638
Elvan Ceyhan
E. Ceyhan, C. E. Priebe
The Use of Domination Number of a Random Proximity Catch Digraph for Testing Spatial Patterns of Segregation and Association
13 pages, 7 figures
Statistics & Probability Letters (2005), 73, 37-50
null
null
stat.ME math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Priebe et al. (2001) introduced the class cover catch digraphs and computed the distribution of the domination number of such digraphs for one dimensional data. In higher dimensions these calculations are extremely difficult due to the geometry of the proximity regions; and only upper-bounds are available. In this article, we introduce a new type of data-random proximity map and the associated (di)graph in $\mathbb R^d$. We find the asymptotic distribution of the domination number and use it for testing spatial point patterns of segregation and association.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:22:56 GMT" } ]
2008-02-06T00:00:00
[ [ "Ceyhan", "E.", "" ], [ "Priebe", "C. E.", "" ] ]
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802.0639
Fatemeh Sadat Tabatabaei Asl
F. S. Tabatabaei, R. Beck, M. Krause, E. M. Berkhuijsen, R. Gehrz, K. D. Gordon, J. L. Hinz, and G. H. Rieke
A Multi-Scale Study of IR and Radio Emission from M33
2 pages, 1 figure, to appear in the proceedings of "Formation and Evolution of Galaxy Disks",eds: Jose G. Funes, S.J. & Enrico M. Corsini (ASP conference series)
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The origin of the tight radio--IR correlation in galaxies has not been fully understood. One reason is the uncertainty about which heating sources (stars or diffuse interstellar radiation field)provide the energy that is absorbed by dust and re-radiated in IR. Another problem is caused by comparing the IR emission with the thermal and nonthermal components of the radio continuum emission separated by simplistically assuming a constant nonthermal spectral index. We use the data at the $Spitzer$ MIPS wavelengths of 24, 70, and 160 $\mu$m, as well as recent radio continuum map at 3.6 cm observed with the 100--m Effelsberg telescope. Using the wavelet transformation, we separate diffuse emission components from compact sources and study the radio-IR correlation at various scales. We also investigate the IR correlations with the thermal and nonthermal radio emissions separated by our developed method. A H$\alpha$ map serves as a tracer of star forming regions.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:28:16 GMT" } ]
2008-02-06T00:00:00
[ [ "Tabatabaei", "F. S.", "" ], [ "Beck", "R.", "" ], [ "Krause", "M.", "" ], [ "Berkhuijsen", "E. M.", "" ], [ "Gehrz", "R.", "" ], [ "Gordon", "K. D.", "" ], [ "Hinz", "J. L.", "" ], [ "Rieke", "G. H.", "" ] ]
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802.064
Rami Barends
R. Barends, J. J. A. Baselmans, S. J. C. Yates, J. R. Gao, J. N. Hovenier, and T. M. Klapwijk
Quasiparticle relaxation in optically excited high-Q superconducting resonators
4 pages, 3 figures
Phys. Rev. Lett. 100, 257002 (2008)
10.1103/PhysRevLett.100.257002
null
cond-mat.supr-con cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The quasiparticle relaxation time in superconducting films has been measured as a function of temperature using the response of the complex conductivity to photon flux. For tantalum and aluminium, chosen for their difference in electron-phonon coupling strength, we find that at high temperatures the relaxation time increases with decreasing temperature, as expected for electron-phonon interaction. At low temperatures we find in both superconducting materials a saturation of the relaxation time, suggesting the presence of a second relaxation channel not due to electron-phonon interaction.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:32:29 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 17:10:07 GMT" } ]
2008-06-25T00:00:00
[ [ "Barends", "R.", "" ], [ "Baselmans", "J. J. A.", "" ], [ "Yates", "S. J. C.", "" ], [ "Gao", "J. R.", "" ], [ "Hovenier", "J. N.", "" ], [ "Klapwijk", "T. M.", "" ] ]
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802.0641
Nicholas J. Proudfoot
Tom Braden, Nicholas J. Proudfoot
The hypertoric intersection cohomology ring
Significant revisions in Section 5, with several corrected proofs
null
10.1007/s00222-009-0181-y
null
math.AG math.AT math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a functorial computation of the equivariant intersection cohomology of a hypertoric variety, and endow it with a natural ring structure. When the hyperplane arrangement associated with the hypertoric variety is unimodular, we show that this ring structure is induced by a ring structure on the equivariant intersection cohomology sheaf in the equivariant derived category. The computation is given in terms of a localization functor which takes equivariant sheaves on a sufficiently nice stratified space to sheaves on a poset.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:36:18 GMT" }, { "version": "v2", "created": "Sun, 10 Feb 2008 07:06:32 GMT" }, { "version": "v3", "created": "Sat, 4 Oct 2008 18:29:32 GMT" } ]
2015-05-13T00:00:00
[ [ "Braden", "Tom", "" ], [ "Proudfoot", "Nicholas J.", "" ] ]
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802.0642
Fatemeh Sadat Tabatabaei Asl
F. S. Tabatabaei, R. Beck, E. Kr\"ugel, M. Krause, E. M. Berkhuijsen, K. D. Gordon, K. M. Menten
Variations of the Radio Synchrotron Spectral Index in M33
2 pages, 1 figure, to appear in the Proceeding "Formation and Evolution of Galaxy Disks", eds: Jose G. Funes, S.J. & Enrico M. Corsini (ASP conference series)
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We determine the variation in the nonthermal radio spectral index in the nearby spiral galaxy M33. We separate the thermal and nonthermal components of the radio continuum emission without the assumption of a constant nonthermal spectral index. Using the Spitzer FIR data at 70 and 160 $\mu$m and a standard dust model, we de-redden the H$\alpha$ emission. The extinction-corrected H$\alpha$ emission serves as a template for the thermal free-free radio emission. Subtracting from the observed 3.6 and 20cm emission (Effelsberg and the VLA) this free-free emission, we obtain maps of the nonthermal intensity and spectral index.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:42:09 GMT" } ]
2008-02-06T00:00:00
[ [ "Tabatabaei", "F. S.", "" ], [ "Beck", "R.", "" ], [ "Krügel", "E.", "" ], [ "Krause", "M.", "" ], [ "Berkhuijsen", "E. M.", "" ], [ "Gordon", "K. D.", "" ], [ "Menten", "K. M.", "" ] ]
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802.0643
Julian Grond
J. Grond, W. P\"otz, A. Imamoglu
Spin entanglement using coherent light and cavity-QED
17 pages, 13 figures, typos corrected, reference updated
Phys. Rev. B 77, 165307 (2008)
10.1103/PhysRevB.77.165307
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A scheme for probabilistic entanglement generation between two distant single electron doped quantum dots, each placed in a high-Q microcavity, by detecting strong coherent light which has interacted dispersively with both subsystems and experienced Faraday rotation due to the spin selective trion transitions is discussed. In order to assess the applicability of the scheme for distant entanglement generation between atomic qubits proposed by T.D. Ladd et al. [New J. Phys. 8, 184 (2006)] to two distant quantum dots, one needs to understand the limitations imposed by hyperfine interactions of the quantum dot spin with the nuclear spins of the material and by non-identical quantum dots. Feasibility is displayed by calculating the fidelity for Bell state generation analytically within an approximate framework. The fidelity is evaluated for a wide range of parameters and different pulse lengths, yielding a trade-off between signal and decoherence, as well as a set of optimal parameters. Strategies to overcome the effect of non-identical quantum dots on the fidelity are examined and the timescales imposed by the nuclear spins are discussed, showing that efficient entanglement generation is possible with distant quantum dots. In this context, effects due to light hole transitions become important and have to be included. The scheme is discussed for one- as well as for two-sided cavities, where one must be careful with reflected light which carries spin information. The validity of the approximate method is checked by a more elaborate semiclassical simulation which includes trion formation.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:44:00 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 09:26:14 GMT" } ]
2015-03-13T00:00:00
[ [ "Grond", "J.", "" ], [ "Pötz", "W.", "" ], [ "Imamoglu", "A.", "" ] ]
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802.0644
Laurent Michel
Gilles Lebeau, Laurent Michel
Semi-classical analysis of a random walk on a manifold
Published in at http://dx.doi.org/10.1214/09-AOP483 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2010, Vol. 38, No. 1, 277-315
10.1214/09-AOP483
IMS-AOP-AOP483
math.SP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove a sharp rate of convergence to stationarity for a natural random walk on a compact Riemannian manifold $(M,g)$. The proof includes a detailed study of the spectral theory of the associated operator.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:49:13 GMT" }, { "version": "v2", "created": "Tue, 16 Dec 2008 17:57:25 GMT" }, { "version": "v3", "created": "Fri, 6 Nov 2009 16:40:45 GMT" }, { "version": "v4", "created": "Tue, 2 Feb 2010 13:57:48 GMT" } ]
2010-02-02T00:00:00
[ [ "Lebeau", "Gilles", "" ], [ "Michel", "Laurent", "" ] ]
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802.0645
Kenneth Falconer
K.J. Falconer and J. Levy Vehel
Multifractional, multistable, and other processes with prescribed local form
32 pages
null
10.1007/s10959-008-0147-9
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a general method for constructing stochastic processes with prescribed local form. Such processes include variable amplitude multifractional Brownian motion, multifractional $\alpha$-stable processes, and multistable processes, that is processes that are locally $\alpha(t)$-stable but where the stability index $\alpha(t)$ varies with $t$. In particular we construct multifractional multistable processes where both the local self-similarity and stability indices vary.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:51:32 GMT" } ]
2008-02-06T00:00:00
[ [ "Falconer", "K. J.", "" ], [ "Vehel", "J. Levy", "" ] ]
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802.0646
Gabriel Maresch
Mathias Beiglb\"ock, Martin Goldstern, Gabriel Maresch, Walter Schachermayer
Optimal and better transport plans
25 pages
null
null
null
math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the Monge-Kantorovich transport problem in a purely measure theoretic setting, i.e. without imposing continuity assumptions on the cost function. It is known that transport plans which are concentrated on c-monotone sets are optimal, provided the cost function c is either lower semi-continuous and finite, or continuous and may possibly attain the value infty. We show that this is true in a more general setting, in particular for merely Borel measurable cost functions provided that {c=infty} is the union of a closed set and a negligible set. In a previous paper Schachermayer and Teichmann considered strongly c-monotone transport plans and proved that every strongly c-monotone transport plan is optimal. We establish that transport plans are strongly c-monotone if and only if they satisfy a "better" notion of optimality called robust optimality.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:52:20 GMT" }, { "version": "v2", "created": "Mon, 19 Jan 2009 08:29:12 GMT" } ]
2009-01-19T00:00:00
[ [ "Beiglböck", "Mathias", "" ], [ "Goldstern", "Martin", "" ], [ "Maresch", "Gabriel", "" ], [ "Schachermayer", "Walter", "" ] ]
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802.0647
Joseph Yukich
T. Schreiber and J. E. Yukich
Stabilization and limit theorems for geometric functionals of Gibbs point processes
null
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given a Gibbs point process $\P^{\Psi}$ on $\R^d$ having a weak enough potential $\Psi$, we consider the random measures $\mu_\la := \sum_{x \in \P^{\Psi} \cap Q_\la} \xi(x, \P^{\Psi} \cap Q_\la) \delta_{x/\la^{1/d}}$, where $Q_{\la} := [-\la^{1/d}/2,\la^{1/d}/2]^d$ is the volume $\la$ cube and where $\xi(\cdot,\cdot)$ is a translation invariant stabilizing functional. Subject to $\Psi$ satisfying a localization property and translation invariance, we establish weak laws of large numbers for $\la^{-1} \mu_\la(f)$, $f$ a bounded test function on $\R^d$, and weak convergence of $\la^{-1/2} \mu_\la(f),$ suitably centered, to a Gaussian field acting on bounded test functions. The result yields limit laws for geometric functionals on Gibbs point processes including the Strauss and area interaction point processes as well as more general point processes defined by the Widom-Rowlinson and hard-core model. We provide applications to random sequential packing on Gibbsian input, to functionals of Euclidean graphs, networks, and percolation models on Gibbsian input, and to quantization via Gibbsian input.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:52:33 GMT" } ]
2008-02-06T00:00:00
[ [ "Schreiber", "T.", "" ], [ "Yukich", "J. E.", "" ] ]
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802.0648
Renxin Xu
Renxin Xu (PKU)
Astro-quark matter: a challenge facing astroparticle physics
14 pages, 4 figures and 1 table; talk presented at CosPA2007 (International Symposium on Cosmology and Particle Astrophysics, Taipei, Nov. 13-15, 2007)
Mod.Phys.Lett.A23:1629-1642,2008
10.1142/S021773230802803X
null
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quark matter both in terrestrial experiment and in astrophysics is briefly reviewed. Astrophysical quark matter could appear in the early Universe, in compact stars, and as cosmic rays. Emphasis is put on quark star as the nature of pulsars. Possible astrophysical implications of experiment-discovered sQGP are also concisely discussed.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:52:39 GMT" } ]
2009-06-23T00:00:00
[ [ "Xu", "Renxin", "", "PKU" ] ]
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802.0649
Marek Karliner
Marek Karliner and Harry J. Lipkin
Possibility of Exotic States in the Upsilon system
LaTex, 5 pages
null
null
null
hep-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent data from Belle show unusually large partial widths Upsilon(5S) --> Upsilon(1S) pi^+pi^- and \Upsilon(5S) --> \Upsilon(2S) pi^+ pi^-. The Z(4430) narrow resonance also reported by Belle in psi' pi^+ spectrum has the properties expected of a (cbar c u dbar) charged isovector tetraquark T^{+-}_cc The analogous state T^{+-} in the bottom sector might mediate anomalously large cascade decays in the Upsilon system, Upsilon(mS) --> T^{+-}_bb pi^{-+} --> Upsilon(nS) pi^+ \pi^-, with a tetraquark-pion intermediate state. We suggest looking for the (bbar b u dbar) tetraquark in these decays as peaks in the invariant mass of Upsilon(1S) pi or Upsilon(2S) pi systems. The (bbar b u sbar) tetraquark can appear in the observed decays Upsilon(5S) --> Upsilon(1S) K^+ K^- as a peak in the invariant mass of Upsilon(1S) K system. We review the model showing that these tetraquarks are below the two heavy meson threshold, but respectively above the Upsilon pi pi and Upsilon K Kbar thresholds.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:52:43 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 14:28:37 GMT" } ]
2008-03-04T00:00:00
[ [ "Karliner", "Marek", "" ], [ "Lipkin", "Harry J.", "" ] ]
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802.065
Luca Guido Molinari
Carlo Alberto Mantica and Luca Guido Molinari
A second-order identity for the Riemann tensor and applications
16 pages
Colloq. Math. 122 (2011) 69 - 82
10.4064/cm122-1-7
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A second-order differential identity for the Riemann tensor is obtained, on a manifold with symmetric connection. Several old and some new differential identities for the Riemann and Ricci tensors descend from it. Applications to manifolds with Recurrent or Symmetric structures are discussed. The new structure of K-recurrency naturally emerges from an invariance property of an old identity by Lovelock.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 15:57:03 GMT" }, { "version": "v2", "created": "Thu, 9 Jul 2009 14:33:01 GMT" } ]
2012-02-16T00:00:00
[ [ "Mantica", "Carlo Alberto", "" ], [ "Molinari", "Luca Guido", "" ] ]
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802.0651
Sergey K. Nemirovskii
Sergey K. Nemirovskii
Kinetics of a Network of Vortex Loops in He II and a Theory of Superfluid Turbulence
34 pages, 9 Postscript figures, [aps,preprint,12pt]{revtex4}
null
10.1103/PhysRevB.77.214509
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A theory is developed to describe the superfluid turbulence on the base of kinetics of the merging and splitting vortex loops. Because of very frequent reconnections the vortex loops (as a whole) do not live long enough to perform any essential evolution due to the deterministic motion. On the contrary, they rapidly merge and split, and these random recombination processes prevail over other slower dynamic processes. To develop quantitative description we take the vortex loops to have a Brownian structure with the only degree of freedom, which is the length $l$ of the loop. We perform investigation on the base of the Boltzmann type kinetic equation for the distribution function $n(l)$ of number of loops with length $l$. By use of the special ansatz in the collision integral we have found the exact power-like solution to kinetic equation in the stationary case. This solution is not (thermodynamically) equilibrium, but on the contrary, it describes the state with two mutual fluxes of the length (or energy) in space of sizes of the vortex loops. The term flux means just redistribution of length (or energy) among the loops of different sizes due to reconnections. Analyzing this solution we drew several results on the structure and dynamics of the vortex tangle in the turbulent superfluid helium. In particular, we evaluated the mean radius of the curvature and the full rate of the reconnection events. We also studied the evolution of the full length of vortex loops per unit volume-the so-called vortex line density. It is shown this evolution to obey the famous Vinen equation. The properties of the Vinen equation from the point of view of the developed approach had been discussed.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:00:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Nemirovskii", "Sergey K.", "" ] ]
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802.0652
Plyatsko Roman
Roman Plyatsko, Oleksandr Stefanyshyn
Mathisson Equations: Non-Oscillatory Solutions in a Schwarzschild Field
11 pages, 3 figures
ActaPhys.Polon.B39:23,2008
null
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Mathisson equations under the Frenkel-Mathisson supplementary condition are studied in a Schwarzschild field. The choice of solutions, which describe the motions of the proper center of mass of a spinning test particle, is discussed, and the calculation procedure for highly relativistic motions is proposed. The very motions are important for astrophysics while investigating possible effects of the gravitational spin-orbit interaction on the particle's world line and trajectory.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:01:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Plyatsko", "Roman", "" ], [ "Stefanyshyn", "Oleksandr", "" ] ]
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802.0653
Jeroen Vandenbrink
Gianluca Giovannetti and Jeroen van den Brink
Electronic correlations decimate the ferroelectric polarization of multiferroic HoMn2O5
4 pages, 4 figures
Phys. Rev. Lett. 100, 227603 (2008)
10.1103/PhysRevLett.100.227603
null
cond-mat.mtrl-sci cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that electronic correlations decimate the intrinsic ferroelectric polarization of the recently discovered class of multiferroic manganites RMn$_2$O$_5$, where R is a rare earth element. Such is manifest from {\it ab initio} bandstructure computations that account for the strong local Coulomb interactions between the manganese 3d electrons --the root of magnetism in these materials. When including these the computed electronic, magnetic and lattice structure of multiferroic HoMn$_2$O$_5$ results in an amplitude and direction of polarization that is in accordance with experiment. The microscopic mechanism behind the decimation is a near cancellation of the ionic polarization induced by ferroelectric lattice displacements and the electronic one caused by valence charge redistributions.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:02:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Giovannetti", "Gianluca", "" ], [ "Brink", "Jeroen van den", "" ] ]
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802.0654
Juan Elias
Juan Elias and Giuseppe Valla
A family of local rings with rational Poincar\'e Series
null
null
null
null
math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this note we compute the Poincare Series of almost stretched Gorenstein local rings. It turns out that it is rational
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:06:37 GMT" } ]
2008-02-06T00:00:00
[ [ "Elias", "Juan", "" ], [ "Valla", "Giuseppe", "" ] ]
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802.0655
Alexander Zhidenko
Hideki Ishihara, Masashi Kimura, Roman A. Konoplya, Keiju Murata, Jiro Soda, Alexander Zhidenko
Evolution of perturbations of squashed Kaluza-Klein black holes: escape from instability
12 pages, 6 figures
Phys.Rev.D77:084019,2008
10.1103/PhysRevD.77.084019
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The squashed Kaluza-Klien (KK) black holes differ from the Schwarzschild black holes with asymptotic flatness or the black strings even at energies for which the KK modes are not excited yet, so that squashed KK black holes open a window in higher dimensions. Another important feature is that the squashed KK black holes are apparently stable and, thereby, let us avoid the Gregory-Laflamme instability. In the present paper, the evolution of scalar and gravitational perturbations in time and frequency domains is considered for these squashed KK black holes. The scalar field perturbations are analyzed for general rotating squashed KK black holes. Gravitational perturbations for the so called zero mode are shown to be decayed for non-rotating black holes, in concordance with the stability of the squashed KK black holes. The correlation of quasinormal frequencies with the size of extra dimension is discussed.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:07:25 GMT" }, { "version": "v2", "created": "Sun, 9 Mar 2008 20:09:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Ishihara", "Hideki", "" ], [ "Kimura", "Masashi", "" ], [ "Konoplya", "Roman A.", "" ], [ "Murata", "Keiju", "" ], [ "Soda", "Jiro", "" ], [ "Zhidenko", "Alexander", "" ] ]
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802.0656
Stefano Pirandola
Stefano Pirandola, Samuel L. Braunstein, Stefano Mancini and Seth Lloyd
Quantum Direct Communication with Continuous Variables
6 pages, 5 figures, REVTeX
Europhys. Lett. 84, 20013 (2008)
10.1209/0295-5075/84/20013
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show how continuous variable systems can allow the direct communication of messages with an acceptable degree of privacy. This is possible by combining a suitable phase-space encoding of the plain message with real-time checks of the quantum communication channel. The resulting protocol works properly when a small amount of noise affects the quantum channel. If this noise is non-tolerable, the protocol stops leaving a limited amount of information to a potential eavesdropper.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:18:37 GMT" }, { "version": "v2", "created": "Wed, 20 Feb 2008 21:49:53 GMT" }, { "version": "v3", "created": "Tue, 2 Dec 2008 23:10:40 GMT" } ]
2008-12-03T00:00:00
[ [ "Pirandola", "Stefano", "" ], [ "Braunstein", "Samuel L.", "" ], [ "Mancini", "Stefano", "" ], [ "Lloyd", "Seth", "" ] ]
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802.0657
Boris A. Popov
HARP Collaboration
Measurement of the production cross-sections of $\pi^\pm$ in p-C and $\pi^\pm$-C interactions at 12 GeV/c
accepted for publication in Astroparticle Physics
null
10.1016/j.astropartphys.2008.02.002
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The results of the measurements of the double-differential production cross-sections of pions in p-C and $\pi^\pm$-C interactions using the forward spectrometer of the HARP experiment are presented. The incident particles are 12 GeV/c protons and charged pions directed onto a carbon target with a thickness of 5% of a nuclear interaction length. For p-C interactions the analysis is performed using 100035 reconstructed secondary tracks, while the corresponding numbers of tracks for $\pi^-$-C and $\pi^+$-C analyses are 106534 and 10122 respectively. Cross-section results are presented in the kinematic range 0.5 GeV/c $\leq p_{\pi} <$ 8 GeV/c and 30 mrad $\leq \theta_{\pi} <$ 240 mrad in the laboratory frame. The measured cross-sections have a direct impact on the precise calculation of atmospheric neutrino fluxes and on the improved reliability of extensive air shower simulations by reducing the uncertainties of hadronic interaction models in the low energy range.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:22:07 GMT" } ]
2015-05-13T00:00:00
[ [ "HARP Collaboration", "", "" ] ]
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802.0658
Enric Verdaguer
B.L. Hu and E. Verdaguer
Stochastic Gravity: Theory and Applications
100 pages, no figures; an update of the 2003 review in Living Reviews in Relativity gr-qc/0307032 ; it includes new sections on the Validity of Semiclassical Gravity, the Stability of Minkowski Spacetime, and the Metric Fluctuations of an Evaporating Black Hole
Living Rev. Relativity, 11 (2008) 3
10.12942/lrr-2008-3
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Whereas semiclassical gravity is based on the semiclassical Einstein equation with sources given by the expectation value of the stress-energy tensor of quantum fields, stochastic semiclassical gravity is based on the Einstein-Langevin equation, which has in addition sources due to the noise kernel. In the first part, we describe the fundamentals of this new theory via two approaches: the axiomatic and the functional. In the second part, we describe three applications of stochastic gravity theory. First, we consider metric perturbations in a Minkowski spacetime, compute the two-point correlation functions of these perturbations and prove that Minkowski spacetime is a stable solution of semiclassical gravity. Second, we discuss structure formation from the stochastic gravity viewpoint. Third, we discuss the backreaction of Hawking radiation in the gravitational background of a black hole and describe the metric fluctuations near the event horizon of an evaporating black hole
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:23:28 GMT" } ]
2015-05-13T00:00:00
[ [ "Hu", "B. L.", "" ], [ "Verdaguer", "E.", "" ] ]
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802.0659
Pier Giorgio Bizzeti
P.G. Bizzeti and A.M. Bizzeti-Sona
Description of nuclear octupole and quadrupole deformation close to the axial symmetry: Critical-point behavior of 224Ra and 224Th
11 pages, 9 figures
Phys.Rev.C77:024320,2008
10.1103/PhysRevC.77.024320
null
nucl-th nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The model, introduced in a previous paper, for the description of the octupole and quadrupole degrees of freedom in conditions close to the axial symmetry, is applied to situations of shape phase transitions where the quadrupole amplitude can reach zero. The transitional nuclei 224,226Ra and 224Th are discussed in the frame of this model. Their level schemes can be reasonably accounted for assuming a square-well potential in two dimensions. Electromagnetic transition amplitudes are also evaluated and compared with existing experimental data.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:23:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Bizzeti", "P. G.", "" ], [ "Bizzeti-Sona", "A. M.", "" ] ]
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802.066
Niclas Wyllard
Mans Henningson, Niclas Wyllard
Zero-energy states of N = 4 SYM on T^3: S-duality and the mapping class group
17 pages
JHEP 0804:066,2008
10.1088/1126-6708/2008/04/066
null
hep-th
null
We continue our studies of the low-energy spectrum of N=4 super-Yang-Mills theory on a spatial three-torus. In two previous papers, we computed the spectrum of normalizable zero-energy states for all choices of gauge group and all values of the electric and magnetic 't Hooft fluxes, and checked its invariance under the SL_2(Z) S-duality group. In this paper, we refine the analysis by also decomposing the space of bound states into irreducible unitary representations of the SL_3(Z) mapping class group of the three-torus. We perform a detailed study of the S-dual pairs of theories with gauge groups Spin(2n+1) and Sp(2n). The predictions of S-duality (which commutes with the mapping class group) are fulfilled as expected, but the proof requires some surprisingly intricate combinatorial infinite product identities.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:32:03 GMT" } ]
2014-11-18T00:00:00
[ [ "Henningson", "Mans", "" ], [ "Wyllard", "Niclas", "" ] ]
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802.0661
Ludkovsky Sergey Victor
S. V. Ludkovsky
Wrap groups of fiber bundles over quaternions and octonions
27 pages, misprints are corrected
null
null
null
math.FA math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article is devoted to the investigation of wrap groups of connected fiber bundles over the fields of real $\bf R$, complex $\bf C$ numbers, the quaternion skew field $\bf H$ and the octonion algebra $\bf O$. These groups are constructed with mild conditions on fibers. Their examples are given. It is shown, that these groups exist and for differentiable fibers have the infinite dimensional Lie groups structure, that is, they are continuous or differentiable manifolds and the composition $(f,g)\mapsto f^{-1}g$ is continuous or differentiable depending on a class of smoothness of groups. Moreover, it is demonstrated that in the cases of real, complex, quaternion and octonion manifolds these groups have structures of real, complex, quaternion or octonion manifolds respectively. Nevertheless, it is proved that these groups does not necessarily satisfy the Campbell-Hausdorff formula even locally.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:33:16 GMT" }, { "version": "v2", "created": "Mon, 22 Dec 2008 22:10:52 GMT" } ]
2008-12-23T00:00:00
[ [ "Ludkovsky", "S. V.", "" ] ]
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802.0662
Marco Panero
Falk Bruckmann, Stefan Keppeler, Marco Panero and Tilo Wettig
Polyakov loops and SU(2) staggered Dirac spectra
7 pages, 4 figures, talk given by M. Panero at the XXV International Symposium on Lattice Field Theory, Regensburg, Germany, 30 July - 4 August 2007
PoS(LATTICE 2007)274
null
null
hep-lat hep-th
null
We consider the spectrum of the staggered Dirac operator with SU(2) gauge fields. Our study is motivated by the fact that the antiunitary symmetries of this operator are different from those of the SU(2) continuum Dirac operator. In this contribution, we investigate in some detail staggered eigenvalue spectra close to the free limit. Numerical experiments in the quenched approximation and at very large $\beta$-values show that the eigenvalues occur in clusters consisting of eight eigenvalues each. We can predict the locations of these clusters for a given configuration very accurately by an analytical formula involving Polyakov loops and boundary conditions. The spacing distribution of the eigenvalues within the clusters agrees with the chiral symplectic ensemble of random matrix theory, in agreement with theoretical expectations, whereas the spacing distribution between the clusters tends towards Poisson behavior.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:21:43 GMT" } ]
2009-04-14T00:00:00
[ [ "Bruckmann", "Falk", "" ], [ "Keppeler", "Stefan", "" ], [ "Panero", "Marco", "" ], [ "Wettig", "Tilo", "" ] ]
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802.0663
Konrad Waldorf
Urs Schreiber and Konrad Waldorf
Smooth Functors vs. Differential Forms
75 pages, 1 figure; v2 with only minor changes; v3 has a layout improvement; v4 is the published version, with small improvements and a better proof of Lemma 2.6
Homology, Homotopy Appl., 13(1), 143-203 (2011)
null
null
math.DG math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish a relation between smooth 2-functors defined on the path 2-groupoid of a smooth manifold and differential forms on this manifold. This relation can be understood as a part of a dictionary between fundamental notions from category theory and differential geometry. We show that smooth 2-functors appear in several fields, namely as connections on (non-abelian) gerbes, as curvatures of smooth functors and as critical points in BF theory. We demonstrate further that our dictionary provides a powerful tool to discuss the transgression of geometric objects to loop spaces.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:48:51 GMT" }, { "version": "v2", "created": "Thu, 28 Aug 2008 19:31:13 GMT" }, { "version": "v3", "created": "Thu, 11 Mar 2010 08:55:00 GMT" }, { "version": "v4", "created": "Mon, 18 Jul 2011 22:19:44 GMT" } ]
2011-07-20T00:00:00
[ [ "Schreiber", "Urs", "" ], [ "Waldorf", "Konrad", "" ] ]
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802.0664
Dinesh Shetty
D.V. Shetty, G.A. Souliotis, S. Galanopoulos, Z. Kohley, S.N. Soisson, B.C. Stein, S. Wuenschel, and S.J. Yennello
Nuclear expansion and symmetry energy of hot nuclei
10 pages, 2 figures
J.Phys.G: Nucl. Part. Phys. 36 (2009) 075103
10.1088/0954-3899/36/7/075103
null
nucl-ex nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The decrease in the symmetry energy of hot nuclei populated in $^{58}$Ni + $^{58}$Ni, $^{58}$Fe + $^{58}$Ni and $^{58}$Fe + $^{58}$Fe reactions at beam energies of 30, 40, and 47 MeV/nucleon, as a function of excitation energy is studied. It is observed that this decrease is mainly a consequence of increasing expansion or decreasing density rather than the increasing temperature. The results are in good agreement with the recently reported microscopic calculation based on the Thomas-Fermi approach. An empirical relation to study the symmetry energy of finite nuclei in various mass region is proposed.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:49:04 GMT" } ]
2015-05-13T00:00:00
[ [ "Shetty", "D. V.", "" ], [ "Souliotis", "G. A.", "" ], [ "Galanopoulos", "S.", "" ], [ "Kohley", "Z.", "" ], [ "Soisson", "S. N.", "" ], [ "Stein", "B. C.", "" ], [ "Wuenschel", "S.", "" ], [ "Yennello", "S. J.", "" ] ]
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802.0665
Tanusree Pal
Tanusree Pal
Vogan Diagrams of Twisted Affine Kac-Moody Lie Algebras
Changed contents
null
null
null
math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Vogan diagram is a Dynkin diagram of a Kac-Moody Lie algebra of finite or affine type overlayed with additional structures. This paper develops the theory of Vogan diagrams for almost compact real forms of indecomposable twisted affine Kac- Moody Lie algebras and shows that equivalence classes of Vogan diagrams correspond to isomorphism classes of almost compact real forms of twisted affine Kac-Moody Lie algebras as given by H. Ben Messaoud and G. Rousseau.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:44:42 GMT" }, { "version": "v2", "created": "Fri, 1 Aug 2008 07:13:17 GMT" } ]
2008-08-01T00:00:00
[ [ "Pal", "Tanusree", "" ] ]
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802.0666
Lasse Rempe
Lasse Rempe and Sebastian van Strien
Absence of line fields and Mane's theorem for non-recurrent transcendental functions
28 pages; V3. Proof of Theorem 7.4 corrected, as well as some other minor corrections
Trans. Amer. Math. Soc. 363 (2011), 203-228
10.1090/S0002-9947-2010-05125-6
null
math.DS math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let f be a transcendental meromorphic function. Suppose that the finite part of the postsingular set of f is bounded, that f has no recurrent critical points or wandering domains, and that the degree of pre-poles of f is uniformly bounded. Then we show that f supports no invariant line fields on its Julia set. We prove this by generalizing two results about rational functions to the transcendental setting: a theorem of Mane about the branching of iterated preimages of disks, and a theorem of McMullen regarding absence of invariant line fields for "measurably transitive" functions. Both our theorems extend results previously obtained by Graczyk, Kotus and Swiatek.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 16:54:48 GMT" }, { "version": "v2", "created": "Wed, 8 Oct 2008 12:16:09 GMT" }, { "version": "v3", "created": "Fri, 6 Aug 2010 15:43:53 GMT" } ]
2014-11-14T00:00:00
[ [ "Rempe", "Lasse", "" ], [ "van Strien", "Sebastian", "" ] ]
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802.0667
Boris Malomed
Ze'ev Birnbaum and Boris A. Malomed (Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel)
Families of spatial solitons in a two-channel waveguide with the cubic-quintic nonlinearity
null
null
10.1016/j.physd.2008.08.005
null
nlin.PS physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present eight types of spatial optical solitons which are possible in a model of a planar waveguide that includes a dual-channel trapping structure and competing (cubic-quintic) nonlinearity. Among the families of trapped beams are symmetric and antisymmetric solitons of "broad" and "narrow" types, composite states, built as combinations of broad and narrow beams with identical or opposite signs ("unipolar" and "bipolar" states, respectively), and "single-sided" broad and narrow beams trapped, essentially, in a single channel. The stability of the families is investigated via eigenvalues of small perturbations, and is verified in direct simulations. Three species - narrow symmetric, broad antisymmetric, and unipolar composite states - are unstable to perturbations with real eigenvalues, while the other five families are stable. The unstable states do not decay, but, instead, spontaneously transform themselves into persistent breathers, which, in some cases, demonstrate dynamical symmetry breaking and chaotic internal oscillations. A noteworthy feature is a stability exchange between the broad and narrow antisymmetric states: in the limit when the two channels merge into one, the former species becomes stable, while the latter one loses its stability. Different branches of the stationary states are linked by four bifurcations, which take different forms in the model with the strong and weak inter-channel coupling.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:03:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Birnbaum", "Ze'ev", "", "Department of Physical\n Electronics, School of Electrical Engineering, Faculty of Engineering, Tel\n Aviv University, Tel Aviv, Israel" ], [ "Malomed", "Boris A.", "", "Department of Physical\n Electronics, School of Electrical Engineering, Faculty of Engineering, Tel\n Aviv University, Tel Aviv, Israel" ] ]
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802.0668
Francesco Marin
J. Belfi, F. Marin
Sensitivity below the standard quantum limit in gravitational wave detectors with Michelson-Fabry-Perot readout
null
Phys.Rev.D77:122002,2008
10.1103/PhysRevD.77.122002
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the quantum noise limited displacement sensitivity of a Michelson-Fabry-Perot (MFP) with detuned cavities, followed by phase-sensitive homodyne detection. We show that the standard quantum limit can be surpassed even with resonant cavities and without any signal-recycling mirror nor additional cavities. Indeed, thanks to the homodyne detection, the output field quadrature can be chosen in such a way to cancel the effect of input amplitude fluctuations, i.e., eliminating the force noise. With detuned cavities, the modified opto-mechanical susceptivity allows to reach unlimited sensitivity for large enough (yet finite) optical power. Our expressions include mirror losses and cavity delay effect, for a realistic comparison with experiments. Our study is particularly devoted to gravitational wave detectors and we consider both an interferometer with free-falling mirrors, and a MFP as readout for a massive detector. In the latter case, the sensitivity curve of the recently conceived 'DUAL' detector, based on two acoustic modes, is obtained.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:11:16 GMT" } ]
2008-11-26T00:00:00
[ [ "Belfi", "J.", "" ], [ "Marin", "F.", "" ] ]
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802.0669
Vadim Guzey
K. Goeke (Ruhr U., Bochum), V. Guzey (Jefferson Lab), M. Siddikov (Ruhr U., Bochum & Uzbekistan Natl. U.)
Deeply Virtual Compton Scattering on nucleons and nuclei in generalized vector meson dominance model
25 pages, 9 figures, 1 table
Eur.Phys.J.A36:49-60,2008
10.1140/epja/i2008-10549-x
JLAB-THY-08-774
hep-ph hep-ex nucl-th
http://creativecommons.org/licenses/publicdomain/
We consider Deeply Virtual Compton Scattering (DVCS) on nucleons and nuclei in the framework of generalized vector meson dominance (GVMD) model. We demonstrate that the GVMD model provides a good description of the HERA data on the dependence of the proton DVCS cross section on Q^2, W (at Q^2=4 GeV^2) and t. At Q^2 = 8 GeV^2, the soft W-behavior of the GVMD model somewhat underestimates the W-dependence of the DVCS cross section due to the hard contribution not present in the GVMD model. We estimate 1/Q^2 power-suppressed corrections to the DVCS amplitude and the DVCS cross section and find them large. We also make predictions for the nuclear DVCS amplitude and cross section in the kinematics of the future Electron-Ion Collider. We predict significant nuclear shadowing, which matches well predictions of the leading-twist nuclear shadowing in DIS on nuclei.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:14:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Goeke", "K.", "", "Ruhr U., Bochum" ], [ "Guzey", "V.", "", "Jefferson Lab" ], [ "Siddikov", "M.", "", "Ruhr U., Bochum & Uzbekistan Natl. U." ] ]
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802.067
Markus Lazar
Markus Lazar, Charalampos Anastassiadis
The gauge theory of dislocations: static solutions of screw and edge dislocations
33 pages, 17 figures
null
10.1080/14786430802558551
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the T(3)-gauge theory of static dislocations in continuous solids. We use the most general linear constitutive relations bilinear in the elastic distortion tensor and dislocation density tensor for the force and pseudomoment stresses of an isotropic solid. The constitutive relations contain six material parameters. In this theory both the force and pseudomoment stresses are asymmetric. The theory possesses four characteristic lengths l1, l2, l3 and l4 which are given explicitely. We first derive the three-dimensional Green tensor of the master equation for the force stresses in the translational gauge theory of dislocations. We then investigate the situation of generalized plane strain (anti-plane strain and plane strain). Using the stress function method, we find modified stress functions for screw and edge dislocations. The solution of the screw dislocation is given in terms of one independent length l1=l4. For the problem of an edge dislocation, only two characteristic lengths l2 and l3 arise with one of them being the same l2=l1 as for the screw dislocation. Thus, this theory possesses only two independent lengths for generalized plane strain. If the two lengths l2 and l3 of an edge dislocation are equal, we obtain an edge dislocation which is the gauge theoretical version of a modified Volterra edge dislocation. In the case of symmetric stresses we recover well known results obtained earlier.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:18:34 GMT" }, { "version": "v2", "created": "Tue, 30 Sep 2008 13:02:12 GMT" }, { "version": "v3", "created": "Thu, 2 Oct 2008 11:10:35 GMT" } ]
2009-11-13T00:00:00
[ [ "Lazar", "Markus", "" ], [ "Anastassiadis", "Charalampos", "" ] ]
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802.0671
Daniel Dale
Daniel A. Dale, Rebecca J. Barlow, Seth A. Cohen, L. Clifton Johnson, ShiAnne M. Kattner, Christine A. Lamanna, Carolynn A. Moore, Micah D. Schuster and Jacob W. Thatcher
The Wyoming Survey for H-alpha. I. Initial Results at z ~ 0.16 and 0.24
To appear in the Astronomical Journal
null
10.1088/0004-6256/135/4/1412
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Wyoming Survey for H-alpha, or WySH, is a large-area, ground-based, narrowband imaging survey for H-alpha-emitting galaxies over the latter half of the age of the Universe. The survey spans several square degrees in a set of fields of low Galactic cirrus emission. The observing program focuses on multiple dz~0.02 epochs from z~0.16 to z~0.81 down to a uniform (continuum+line) luminosity at each epoch of ~10^33 W uncorrected for extinction (3sigma for a 3" diameter aperture). First results are presented here for 98+208 galaxies observed over approximately 2 square degrees at redshifts z~0.16 and 0.24, including preliminary luminosity functions at these two epochs. These data clearly show an evolution with lookback time in the volume-averaged cosmic star formation rate. Integrals of Schechter fits to the extinction-corrected H-alpha luminosity functions indicate star formation rates per co-moving volume of 0.009 and 0.014 h_70 M_sun/yr/Mpc^3 at z~0.16 and 0.24, respectively. The formal uncertainties in the Schechter fits, based on this initial subset of the survey, correspond to uncertainties in the cosmic star formation rate density at the >~40% level; the tentative uncertainty due to cosmic variance is 25%, estimated from separately carrying out the analysis on data from the first two fields with substantial datasets.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:19:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Dale", "Daniel A.", "" ], [ "Barlow", "Rebecca J.", "" ], [ "Cohen", "Seth A.", "" ], [ "Johnson", "L. Clifton", "" ], [ "Kattner", "ShiAnne M.", "" ], [ "Lamanna", "Christine A.", "" ], [ "Moore", "Carolynn A.", "" ], [ "Schuster", "Micah D.", "" ], [ "Thatcher", "Jacob W.", "" ] ]
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802.0672
Horacio Ceva
Ines Caridi and Horacio Ceva
The underlying complex network of the Minority Game
null
null
null
null
physics.soc-ph cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the structure of the underlying network of connections in the Minority Game. There is not an explicit interaction among the agents, but they interact via global magnitudes of the model and mainly through their strategies. We define a link between two agents by quantifying the similarity among their strategies, and analyze the structure of the resulting underlying complex networks as a function of the number of agents in the game and the value of the agents' memory, in games with two strategies per player. We characterize the different phases of this system with networks with different properties, for this link definition. Thus, the Minority Game phase characterized by the presence of crowds can be identified with a small world network, while the phase with the same results as a random decision game as a random network. Finally, we use the Full Strategy Minority Game model, to explicitly calculate some properties of its networks, such as the degree distribution, for the same link definition, and to estimate, from them, the properties of the networks of the Minority Game, obtaining a very good agreement with its measured properties.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:20:28 GMT" } ]
2008-02-06T00:00:00
[ [ "Caridi", "Ines", "" ], [ "Ceva", "Horacio", "" ] ]
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802.0673
Erkan Nane
Mark M. Meerschaert, Erkan Nane, P. Vellaisamy
Fractional Cauchy problems on bounded domains
Published in at http://dx.doi.org/10.1214/08-AOP426 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Probability 2009, Vol. 37, No. 3, 979-1007
10.1214/08-AOP426
IMS-AOP-AOP426
math.PR math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fractional Cauchy problems replace the usual first-order time derivative by a fractional derivative. This paper develops classical solutions and stochastic analogues for fractional Cauchy problems in a bounded domain $D\subset\mathbb{R}^d$ with Dirichlet boundary conditions. Stochastic solutions are constructed via an inverse stable subordinator whose scaling index corresponds to the order of the fractional time derivative. Dirichlet problems corresponding to iterated Brownian motion in a bounded domain are then solved by establishing a correspondence with the case of a half-derivative in time.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:21:25 GMT" }, { "version": "v2", "created": "Fri, 24 Jul 2009 14:14:49 GMT" } ]
2009-07-24T00:00:00
[ [ "Meerschaert", "Mark M.", "" ], [ "Nane", "Erkan", "" ], [ "Vellaisamy", "P.", "" ] ]
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802.0674
Uma P. Vijh
A. N. Witt (1), S. Mandel (2), P. H. Sell (3), T. Dixon (4) and U. P. Vijh (1) ((1) University of Toledo, (2) Hidden Valley Observatory, (3) University of Wisconsin, (4) University of Hawaii)
Extended Red Emission in High-Galactic Latitude Interstellar Clouds
Accepted for Publication in the ApJ
null
10.1086/587131
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nearby interstellar clouds at high Galactic latitudes are ideal objects in which the interaction of interstellar dust with photons from the well-characterized interstellar radiation field can be studied. Scattering and UV-excited photoluminescence at optical wavelengths as well as thermal emission at mid- and far-infrared wavelengths are observable manifestations of such interactions. Here we report initial results from an optical imaging survey of optically thin high-Galactic-latitude clouds, which is designed to study the surface brightness, structure, and spectral energy distribution of these objects. The primary aim of this paper is to study the extended red emission (ERE) that has been reported at high Galactic latitudes in earlier investigations and which is attributed to ultraviolet-excited photoluminescence of an as yet unidentified component of interstellar dust. We find strong evidence for dust emission in the form of a broad (>1000 A FWHM) ERE band with peak emission near 600 nm wavelength and peak intensity of ~ 5x10^-9 (erg cm^-2 s^-1 A^-1 sr^-1) in optically-thin clouds. This amounts to about 30% of the total optical surface brightness of these clouds, the remainder being consistent with expectations for dust-scattered light. This supports claims for the ubiquitous presence of the ERE carrier throughout the diffuse interstellar medium of the Milky Way Galaxy. We suggest that the ERE carrier is involved in the radiative processing of about 20% to 30% of the dust-absorbed UV/optical luminosity of the Milky Way galaxy, with the bulk of this energy being emitted in the near- to mid-infrared spectral regions.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:23:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Witt", "A. N.", "" ], [ "Mandel", "S.", "" ], [ "Sell", "P. H.", "" ], [ "Dixon", "T.", "" ], [ "Vijh", "U. P.", "" ] ]
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802.0675
Emil Johansson Bergholtz
Eddy Ardonne, Emil J. Bergholtz, Janik Kailasvuori, Emma Wikberg
Degeneracy of non-abelian quantum Hall states on the torus: domain walls and conformal field theory
15 pages
J.Stat.Mech.0804:P04016,2008
10.1088/1742-5468/2008/04/P04016
NORDITA-2008-5
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the non-abelian Read-Rezayi quantum Hall states on the torus, where it is natural to employ a mapping of the many-body problem onto a one-dimensional lattice model. On the thin torus--the Tao-Thouless (TT) limit--the interacting many-body problem is exactly solvable. The Read-Rezayi states at filling $\nu=\frac k {kM+2}$ are known to be exact ground states of a local repulsive $k+1$-body interaction, and in the TT limit this is manifested in that all states in the ground state manifold have exactly $k$ particles on any $kM+2$ consecutive sites. For $M\neq 0$ the two-body correlations of these states also imply that there is no more than one particle on $M$ adjacent sites. The fractionally charged quasiparticles and quasiholes appear as domain walls between the ground states, and we show that the number of distinct domain wall patterns gives rise to the nontrivial degeneracies, required by the non-abelian statistics of these states. In the second part of the paper we consider the quasihole degeneracies from a conformal field theory (CFT) perspective, and show that the counting of the domain wall patterns maps one to one on the CFT counting via the fusion rules. Moreover we extend the CFT analysis to topologies of higher genus.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:26:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Ardonne", "Eddy", "" ], [ "Bergholtz", "Emil J.", "" ], [ "Kailasvuori", "Janik", "" ], [ "Wikberg", "Emma", "" ] ]
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802.0676
Roald Guandalini
R. Guandalini (Department of Physics, University of Perugia)
MS, S and C Stars in the Infrared. Luminosities and Mass Loss Rates
10 pages, 6 figures, contribution from the IX Torino Workshop, to be published by AIP
AIP Conf.Proc.1001:339-348,2008
10.1063/1.2916983
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this note I present an outline of infrared (IR) photometric AGB properties, based on two samples of Galactic Long Period Variables (C- and S-type respectively). I show the various selection criteria used during the choice of the sources and describe the motivations of observing them at near- and mid-IR wavelengths. I discuss the problems encountered in estimating their luminosity and distance and motivate the methods I choose for this purpose. Properties of the luminosity functions and of the Hertzsprung-Russell (HR) diagrams obtained from the analysis are discussed. Finally, the choices made for estimating of the mass loss rates are described and preliminary results concerning them are shown.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 20:04:08 GMT" } ]
2009-06-23T00:00:00
[ [ "Guandalini", "R.", "", "Department of Physics, University of Perugia" ] ]
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802.0677
Andrei Vieru
Andrei Vieru
General definitions of chaos for continuous and discrete-time processes
9 pages
null
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A precise definition of chaos for discrete processes based on iteration already exists. We shall first reformulate it in a more general frame, taking into account the fact that discrete chaotic behavior is neither necessarily based on iteration nor strictly related to compact metric spaces or to bounded functions. Then we shall apply the central idea of this definition to continuous processes. We shall try to see what chaos is, regardless of the way it is generated.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:32:07 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 17:48:21 GMT" }, { "version": "v3", "created": "Sat, 31 May 2008 22:40:27 GMT" } ]
2008-06-01T00:00:00
[ [ "Vieru", "Andrei", "" ] ]
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802.0678
Gabriele Cescutti
G. Cescutti (Astronomy Department, Trieste University)
An inhomogeneous model for the Galactic halo: a possible explanation for the spread observed in s- and r-process elements
10 pages, 14 figures, accepted for publication in A&A
null
10.1051/0004-6361:20078571
null
astro-ph
null
We propose an explanation for the considerable scatter of the abundances of neutron capture elements observed in low-metallicity stars in the solar vicinity, compared to the small star-to-star scatter observed for the alpha-elements. We have developed a stochastic chemical evolution model in which the main assumption is a random formation of new stars subject to the condition that the cumulative mass distribution follows a given initial mass function. With our model, we are able to reproduce the different spreads of neutron capture elements and alpha-elements in low-metallicity stars. The reason for different observed spread in neutron capture elements and alpha-elements resides in the random birth of stars, coupled with different stellar mass ranges, from which alpha-elements and neutron capture elements originate. In particular, the site of production of alpha-elements is the whole range of massive stars, from 10 to 80 Msun whereas the mass range of production for neutron capture elements lies between 12 and 30 Msun.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:00:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Cescutti", "G.", "", "Astronomy Department, Trieste University" ] ]
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802.0679
Fatine Latif
Emmanuel Fricain (ICJ), Javad Mashreghi
Boundary behavior of functions in the de Branges--Rovnyak spaces
null
null
null
null
math.CV math.FA
null
This paper deals with the boundary behavior of functions in the de Branges--Rovnyak spaces. First, we give a criterion for the existence of radial limits for the derivatives of functions in the de Branges--Rovnyak spaces. This criterion generalizes a result of Ahern-Clark. Then we prove that the continuity of all functions in a de Branges--Rovnyak space on an open arc $I$ of the boundary is enough to ensure the analyticity of these functions on $I$. We use this property in a question related to Bernstein's inequality.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:38:36 GMT" } ]
2008-02-06T00:00:00
[ [ "Fricain", "Emmanuel", "", "ICJ" ], [ "Mashreghi", "Javad", "" ] ]
[ 0.0265463144, 0.0009924527, 0.0400877446, 0.0580493025, 0.0547278188, 0.0216535144, 0.0479315519, -0.0321928337, 0.0290757511, 0.155547604, 0.0377371572, -0.007217838, -0.0053367289, -0.001978518, 0.0145378755, 0.1597377807, 0.0368429087, 0.0530926287, 0.1153832078, 0.0638235733, 0.0419528857, -0.0265207645, -0.009517326, 0.0357698165, 0.0018890934, -0.0256137438, 0.0312219393, 0.0318862349, 0.0039123236, -0.0845700651, 0.06203508, -0.0102007855, -0.0018571561, -0.1023527756, -0.0409053378, 0.06801375, 0.0249111224, 0.037302807, 0.0276449583, 0.0587646961, -0.0976004973, 0.0042476659, -0.072050631, 0.0824238732, -0.0200566463, 0.0449166708, 0.0132603822, -0.0288969018, 0.0142440517, 0.0390913002, -0.0808908865, 0.1038857624, 0.0602465905, -0.1006664857, -0.0066812905, 0.0781314969, -0.0383759029, 0.0607064888, 0.1212085783, -0.1048566625, 0.0382992513, -0.1122150198, -0.0452743657, 0.0355654173, -0.1804842651, 0.0648966655, -0.0475483052, 0.0007656976, 0.0640279725, 0.0242723748, -0.0950455144, 0.0713352337, 0.040241044, 0.0621372797, 0.0123533616, -0.0396278463, 0.1264207512, 0.0434092283, -0.0618306808, 0.0569251068, 0.0738391206, 0.0230459813, -0.0360508636, 0.0466285087, 0.0044488707, -0.013873579, -0.0058317576, -0.010060261, -0.0516618341, 0.0240296517, -0.0170289874, -0.0055698715, -0.0768029019, 0.091110833, 0.1201865822, 0.0258820169, 0.0224966593, 0.078642495, 0.0094790012, -0.0416718349, -0.0861030594, -0.025856467, 0.0034907509, -0.0515851863, 0.1837546527, 0.0504609905, 0.0391934998, 0.0027545951, -0.0273383595, -0.0152788218, 0.0043690274, -0.0931548178, 0.007492499, -0.0125385979, 0.0113249794, -0.0542168207, -0.1306109279, -0.0159686673, -0.041109737, -0.0137586044, -0.0179998819, -0.0268529113, 0.0660208613, 0.0081312461, 0.0752699152, -0.1189601868, 0.0486214012, -0.1037835628, -0.1236613616, -0.0926949233, 0.0481104031, 0.0075755361, 0.0065184101, -0.1031703725, -0.1597377807, 0.0006714825, 0.0245278738, -0.0496944934, 0.1175293922, 0.0306853913, -0.0036472438, 0.1181425899, 0.1027104706, -0.0176421851, -0.088453643, 0.059582293, -0.0454021171, -0.006403436, 0.0880959481, 0.0131965075, -0.0005433339, 0.0090382658, 0.0058030137, -0.0094406763, -0.0404198915, -0.0514829867, 0.066174157, 0.0958120078, 0.1336769164, 0.0052345293, -0.0161091927, 0.0994400904, -0.0829859748, -0.098213695, 0.0985202938, -0.0213341396, -0.035079971, 0.0521472804, -0.028564753, -0.0523772314, -0.0849277601, -0.026674062, -0.0231865048, -0.0518151335, 0.0373283587, -0.0073966868, 0.0140141025, -0.1034769714, 0.0127749341, 0.0194306746, 0.0406498425, 0.148393631, 0.0804309845, -0.1219239756, 0.0223944597, 0.0838035718, 0.035079971, 0.0352077186, -0.0329593308, 0.0528371297, -0.0775694028, 0.0963230059, 0.0434603281, 0.0036280814, 0.001965743, -0.1141568124, 0.0146783991, 0.0237486027, -0.048187051, -0.0587135963, 0.1135436147, -0.0345434211, 0.0650499687, -0.0190474279, -0.0949433148, 0.1187557876, -0.0146273002, 0.0925927237, -0.0164924394, 0.0196478497, -0.020120522, -0.0212574899, 0.0345434211, 0.0357698165, 0.0024735467, 0.0209125672, 0.006403436, 0.1185513884, 0.0072497753, 0.064947769, -0.0025086778, 0.0726638287, 0.0388613492, 0.0119381761, 0.0096834004, 0.0667362586, 0.0505631901, -0.0470373072, 0.0031043091, 0.012238387, 0.1060830578, -0.0255881939, -0.0794600919, -0.0424127802, 0.0320650861, 0.0045191329, -0.0552899167, 0.0201843958, -0.0217429381, -0.0783358961, -0.0496433936, 0.0259586666, 0.0000591839, -0.0316051878, 0.0961697027, 0.0073264251, -0.028564753, 0.0774672031, -0.0028344386, -0.1028126702, -0.0672472566, 0.0964252055, -0.0157642681, -0.0003762617, -0.085745357, 0.0284114536 ]
802.068
Roberto D. Mota Esteves
D Martinez and R D Mota
SUSY QM, symmetries and spectrum generating algebras for two-dimensional systems
null
null
10.1016/j.aop.2007.07.001
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show in a systematic and clear way how factorization methods can be used to construct the generators for hidden and dynamical symmetries. This is shown by studying the 2D problems of hydrogen atom, the isotropic harmonic oscillator and the radial potential $A\rho^{2\zeta-2}-B\rho^{\zeta-2}$. We show that in these cases the non-compact (compact) algebra corresponds to so(2,1) (su(2)).
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:45:51 GMT" } ]
2008-02-06T00:00:00
[ [ "Martinez", "D", "" ], [ "Mota", "R D", "" ] ]
[ 0.0109165516, 0.0169868823, -0.0016855055, 0.0658885166, -0.0372882783, 0.0675959885, -0.0768364519, 0.0004778738, -0.1092785075, 0.0128186308, -0.0150408614, -0.0600127839, -0.0255619306, 0.0656374171, 0.1169119328, 0.0899438486, 0.0067231897, 0.0106717292, 0.0604647622, 0.0186441392, -0.0253359415, -0.0453234613, 0.016308913, -0.0051412624, 0.0133082746, -0.0043063569, -0.0162838046, 0.051826939, 0.1117895022, -0.0480353385, 0.0922539607, -0.0636788383, -0.0422851592, -0.0804522857, -0.0332204662, 0.1383056194, -0.0741245747, 0.0572004691, -0.0747774392, 0.037338499, -0.0257000364, -0.0322913975, -0.0504961126, -0.0296297427, 0.0861773565, 0.0553423353, -0.0264156684, -0.0087445406, 0.0418080688, -0.0215568934, -0.0074953204, 0.0902451649, 0.1055622399, -0.0010930676, -0.0691528097, -0.0654365346, -0.0342750847, 0.0688514858, 0.0394979529, -0.0279724859, 0.0400754847, 0.0137351435, 0.0034683121, 0.1202264503, -0.0655871928, -0.0174388606, -0.0997869447, -0.0529317781, -0.0239423383, 0.0360830016, -0.0490146242, -0.0025392438, 0.1172132567, 0.0099937608, 0.0775897503, -0.0233899206, 0.0058976999, 0.1340871453, -0.007576928, 0.003788464, -0.0358570106, -0.0052448413, -0.001231957, 0.0084181111, -0.0945138559, 0.0060734698, -0.0621220209, 0.0922037438, -0.067344889, -0.0870310962, 0.0140866833, 0.0497930348, -0.0307596903, -0.0146767665, 0.1469434351, -0.1049595997, 0.0723668784, -0.0075455406, -0.0548903532, 0.0175895207, -0.0359825604, -0.0000899937, 0.0081481794, 0.0029001995, 0.0281482562, 0.0439173058, -0.0168864429, -0.0599625632, -0.0679475293, 0.0252731666, 0.006999399, -0.0011283784, -0.0540868342, 0.0443692841, 0.0026742099, -0.1002389267, -0.1023983806, -0.0861773565, -0.0248839613, 0.0888892263, -0.0166855622, -0.0483617671, 0.0170119926, 0.0347019546, 0.0905967057, -0.0360076725, -0.0662400499, -0.1193224937, -0.0565978326, 0.0954680368, 0.0929068178, 0.0042090556, -0.0580039881, -0.0393221825, -0.0082235094, -0.0098744882, 0.1252484322, -0.0470811576, 0.0582048669, 0.0150534157, 0.115907535, -0.0062963204, 0.0831641629, 0.0359574519, 0.0419838391, 0.0091463001, 0.0075078756, 0.0348777212, 0.0115694106, 0.0396486148, -0.0459763221, -0.1022477224, 0.0917517617, 0.0552921146, 0.0097803259, -0.1249471232, 0.0469556078, -0.0002454105, -0.0203265063, 0.011016991, 0.0060671922, 0.0655871928, -0.0647334531, -0.0474326983, 0.0596612468, 0.031814307, -0.1274581105, -0.0793976635, -0.037916027, -0.0778910667, 0.028851334, -0.1089771912, -0.080552727, -0.0392468534, 0.0605652034, -0.0340239853, -0.0934592411, -0.1764727384, -0.1268554777, -0.0182172693, 0.0849720761, -0.004205917, 0.0360578895, -0.042410709, -0.048863966, -0.0011550578, 0.0049749091, -0.0286253449, 0.0635281801, -0.0196987577, -0.0242436584, 0.0815571249, 0.0351288207, 0.0655871928, 0.0215568934, -0.1657256782, -0.0183177106, 0.0763844699, -0.0376147069, -0.0370120704, 0.0000341584, 0.0033521785, 0.1762718558, -0.0787950307, -0.0824610814, 0.0140239084, 0.0411300994, -0.0435406566, -0.0287508946, -0.0494163856, -0.0376398191, 0.0641308129, 0.0584559664, 0.0486128666, -0.0478595681, 0.0591088273, -0.0659387335, 0.080100745, 0.0141745675, 0.0622224584, -0.1696428359, 0.0657880753, 0.073019743, -0.0098305456, 0.0243064333, 0.0369869582, 0.0019460212, -0.0090144724, -0.0615193807, -0.0032580162, 0.0616700426, 0.0445701629, -0.0091400221, 0.0587070659, -0.1110864282, 0.0232392605, -0.0362336598, -0.047558248, -0.096070677, -0.0382173471, 0.01826749, -0.0300315022, 0.0871817544, 0.0191337839, 0.1130952239, 0.0579537675, -0.0032093658, -0.010000038, 0.0844196603, -0.0803518444, -0.0866795555, 0.1449346393, 0.0126742478, 0.1021472812, -0.0630259812, 0.053132657 ]
802.0681
Christophe Real
Christophe Real
Numerical Correpondences between the physical Constants
null
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present here a note which synthesizes our previous ideas concerning some problems in cosmology, and the numerical correspondences between the physical constants that we could deduce.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:50:26 GMT" } ]
2008-02-06T00:00:00
[ [ "Real", "Christophe", "" ] ]
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802.0682
Davide Pini
Alberto Parola, Davide Pini, and Luciano Reatto
Liquid-vapor transition from a microscopic theory: Beyond the Maxwell construction
4 pages, 5 figures
null
10.1103/PhysRevLett.100.165704
null
cond-mat.stat-mech cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A smooth cut-off formulation of the Hierarchical Reference Theory (HRT) is developed and applied to a Yukawa fluid. The HRT equations are derived and numerically solved leading to: the expected renormalization group structure in the critical region, non classical critical exponents and scaling laws, a convex free energy in the whole phase diagram (including the two-phase region), finite compressibility at coexistence, together with a fully satisfactory comparison with available numerical simulations. This theory, which also guarantees the correct short range behavior of two body correlations, represents a major improvement over the existing liquid state theories.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 17:56:10 GMT" }, { "version": "v2", "created": "Mon, 7 Apr 2008 18:01:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Parola", "Alberto", "" ], [ "Pini", "Davide", "" ], [ "Reatto", "Luciano", "" ] ]
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802.0683
Gabriel Price
Gabriel N. Price, S. Travis Bannerman, Kirsten Viering, Edvardas Narevicius and Mark G. Raizen
Single-Photon Atomic Cooling
4 pages and 3 figures
null
10.1103/PhysRevLett.100.093004
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the cooling of an atomic ensemble with light, where each atom scatters only a single photon on average. This is a general method that does not require a cycling transition and can be applied to atoms or molecules which are magnetically trapped. We discuss the application of this new approach to the cooling of hydrogenic atoms for the purpose of precision spectroscopy and fundamental tests.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:01:42 GMT" } ]
2009-11-13T00:00:00
[ [ "Price", "Gabriel N.", "" ], [ "Bannerman", "S. Travis", "" ], [ "Viering", "Kirsten", "" ], [ "Narevicius", "Edvardas", "" ], [ "Raizen", "Mark G.", "" ] ]
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802.0684
W. Desmond Ramsay
Willem T.H. van Oers
From Hadronic Parity Violation to Parity-Violating Electron Scattering and Tests of the Standard Model
12 pages, 8 figures, LaTeX. Invited talk at the International Symposium on Cosmology and Particle Astrophysics (CosPA07), Taipei, Taiwan, Nov 13-15, 2007
null
10.1142/S0217732308027643
TRI-PP-07-46
nucl-ex hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
After almost five decades of study of parity violation in hadronic systems, the determination of the seven weak meson-nucleon couplings is still incomplete. Whereas parity violation in nuclear systems is complicated by the intricacies of QCD, measurements of parity violation in the much simpler proton-proton system are more straightforward to interpret. We now have three such precision pp experiments at 13.6, at 45, and 221 MeV. Today there are also better possibilities for theoretical interpretation using effective field theory. In electron-proton scattering, parity violating ep experiments such as SAMPLE, G0, HAPPEX, and PVA4 have already shown that the strange quark contributions to the charge and magnetization distributions of the nucleon are tiny. When analyzed together, the results have also greatly improved knowledge of the proton's "weak charge" (Q^p_weak = 1-4sin^2\theta_W at tree level). The Q^p_weak experiment at JLab will further improve this, determining the proton's weak charge to a precision of about 4%. Such a precision will either establish conformity with the Standard Model of quarks and leptons or point to New Physics. Following the upgrade of CEBAF at JLab to 12 GeV, a parity violating electron-electron (Moller) scattering experiment similar to SLAC E158, will measure the weak charge of the electron and hence sin^2\theta_W at low energy with a precision comparable to the most precise individual measurements at the Z0 pole (to about +/- 0.00025). This experiment will be complementary to Q^p_weak in terms of sensitivity to New Physics.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:02:48 GMT" } ]
2009-11-13T00:00:00
[ [ "van Oers", "Willem T. H.", "" ] ]
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802.0685
C\'edric B\'eny
C\'edric B\'eny
Unsharp pointer observables and the structure of decoherence
null
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The theory of decoherence attempts to explain the emergent classical behaviour of a quantum system interacting with its quantum environment. In order to formalize this mechanism we introduce the idea that the information preserved in an open quantum evolution (or channel) can be characterized in terms of observables of the initial system. We use this approach to show that information which is broadcast into many parts of the environment can be encoded in a single observable. This supports a model of decoherence where the pointer observable can be an arbitrary positive operator-valued measure (POVM). This generalization makes it possible to characterize the emergence of a realistic classical phase-space. In addition, this model clarifies the relationships among the information preserved in the system, the information flowing from the system to the environment (measurement), and the establishment of correlations between the system and the environment.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 20:39:37 GMT" } ]
2008-02-06T00:00:00
[ [ "Bény", "Cédric", "" ] ]
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802.0686
Colin Torney Mr
Colin Torney, Zoltan Neufeld
Phototactic Clustering of Swimming Micro-organisms in a Turbulent Velocity Field
null
null
10.1103/PhysRevLett.101.078105
null
math-ph math.MP
null
We study the distribution of swimming micro-organisms advected by a model turbulent flow and attracted towards a localised light source through phototaxis. It is shown that particles aggregate along a dynamical attractor with fractal measure whose dimension depends on the strength of the phototaxis. Using an effective diffusion approximation for the flow we derive an analytic expression for the phototactic gain (increase in light exposure over the aggregate) and by extension an accurate prediction for the fractal dimension based on the properties of the advection dynamics and the statistics of the attracting field. This shows that the fractal characteristics of the aggregate are determined by the non-dimensional ratio of the kinetic energy of swimming to that of the turbulent flow.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:12:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Torney", "Colin", "" ], [ "Neufeld", "Zoltan", "" ] ]
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802.0687
Thomas Wiegelmann
T. Wiegelmann, B. Inhester
Magnetic modelling and tomography: First steps towards a consistent reconstruction of the solar corona
29 pages, 6 figures
Solar Phys.214:287,2003
10.1023/A:1024282131117
null
astro-ph
null
We undertake a first attempt towards a consistent reconstruction of the coronal magnetic field and the coronal density structure. We consider a stationary solar corona which has to obey the equations of magnetohydrostatics. We solve these equations with help of a newly developed optimization scheme. As a first step we illustrate how tomographic information can be included into the reconstruction of coronal magnetic fields. In a second step we use coronal magnetic field information to improve the tomographic inversion process. As input the scheme requires magnetic field measurements on the photosphere from vector-magnetographs and the line-of-sight integrated density distribution from coronagraphs. We test our codes with well known analytic magnetohydrostatic equilibria and models. The program is planed for use within the STEREO mission.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:19:54 GMT" } ]
2009-06-25T00:00:00
[ [ "Wiegelmann", "T.", "" ], [ "Inhester", "B.", "" ] ]
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802.0688
Marco Valerio Battisti
Marco Valerio Battisti, Giovanni Montani
Quantum cosmology with a minimal length
8 pages, 3 figures; to appear in the proceedings of the II Stueckelberg Workshop, Int.J.Mod.Phys.A, references added
Int.J.Mod.Phys.A23:1257-1265,2008
10.1142/S0217751X08040184
null
gr-qc hep-th
null
Quantum cosmology in the presence of a fundamental minimal length is analyzed in the context of the flat isotropic and the Taub cosmological models. Such minimal scale comes out from a generalized uncertainty principle and the quantization is performed in the minisuperspace representation. Both the quantum Universes are singularity-free and (i) in the isotropic model no evidences for a Big-Bounce appear; (ii) in the Taub one a quasi-isotropic configuration for the Universe is predicted by the model.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:08:29 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 13:46:25 GMT" } ]
2008-11-26T00:00:00
[ [ "Battisti", "Marco Valerio", "" ], [ "Montani", "Giovanni", "" ] ]
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802.0689
Fangwen Sun
F.W. Sun, B.H. Liu, C.W. Wong, G.C. Guo
Permutation asymmetry inducing entanglement between degrees of freedom in multiphoton states
Final version
Phys. Rev. A 78, 015804 (2008)
10.1103/PhysRevA.78.015804
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe and examine entanglement between different degrees of freedom in multiphoton states based on the permutation properties. From the state description, the entanglement comes from the permutation asymmetry. According to the different permutation properties, the multiphoton states can be divided into several parts. It will help to deal with the multiphoton interference, which can be used as the measurement of the entanglement.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:17:11 GMT" }, { "version": "v2", "created": "Thu, 31 Jul 2008 15:29:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Sun", "F. W.", "" ], [ "Liu", "B. H.", "" ], [ "Wong", "C. W.", "" ], [ "Guo", "G. C.", "" ] ]
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802.069
Pavel Bleher
Pavel Bleher and Karl Liechty
Exact solution of the six-vertex model with domain wall boundary condition. Critical line between ferroelectric and disordered phases
22 pages, 6 figures, to appear in the Journal of Statistical Physics
null
10.1007/s10955-009-9688-2
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is a continuation of the papers [4] of Bleher and Fokin and [5] of Bleher and Liechty, in which the large $n$ asymptotics is obtained for the partition function $Z_n$ of the six-vertex model with domain wall boundary conditions in the disordered and ferroelectric phases, respectively. In the present paper we obtain the large $n$ asymptotics of $Z_n$ on the critical line between these two phases.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:31:07 GMT" }, { "version": "v2", "created": "Thu, 26 Jun 2008 15:16:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Bleher", "Pavel", "" ], [ "Liechty", "Karl", "" ] ]
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802.0691
Betsabe Blas
Betsab\'e G. Blas Achic, M\^onica C. Sandoval and Olga Satomi Yoshida
Homoscedastic controlled calibration model
LaTex, 21 pages. Includes 13 tables. Version published in Journal of Chemometrics, v. 21, p. 145-155, 2007
Journal of Chemometrics, v. 21, p. 145-155, 2007
null
null
stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the context of the usual calibration model, we consider the case in which the independent variable is unobservable, but a pre-fixed value on its surrogate is available. Thus, considering controlled variables and assuming that the measurement errors have equal variances we propose a new calibration model. Likelihood based methodology is used to estimate the model parameters and the Fisher information matrix is used to construct a confidence interval for the unknown value of the regressor variable. A simulation study is carried out to asses the effect of the measurement error on the estimation of the parameter of interest. This new approach is illustrated with an example.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:44:45 GMT" } ]
2008-02-06T00:00:00
[ [ "Achic", "Betsabé G. Blas", "" ], [ "Sandoval", "Mônica C.", "" ], [ "Yoshida", "Olga Satomi", "" ] ]
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802.0692
Gabriel Navarro
Pascual Jara, Luis Merino, Gabriel Navarro and Juan Francisco Ru\'iz
Prime path coalgebras
14 pages
null
null
null
math.RA math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use prime coalgebras as a generalization of simple coalgebras, and observe that prime subcoalgebras represent the structure of the coalgebra in a more efficient way than simple coalgebras. In particular, in this work we focus our attention on the study and characterization of prime subcoalgebras of path coalgebras of quivers and, by extension, of prime pointed coalgebras.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:53:51 GMT" } ]
2008-02-06T00:00:00
[ [ "Jara", "Pascual", "" ], [ "Merino", "Luis", "" ], [ "Navarro", "Gabriel", "" ], [ "Ruíz", "Juan Francisco", "" ] ]
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802.0693
M. Polletta
M. Polletta (IAP, France & INAF-IASF Milano, Italy)
Black hole growth and stellar assembly at high-z
A&A Letters accepted
null
10.1051/0004-6361:20079200
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Context. Observations indicate a strong link between star formation and black hole (BH) growth, but some questions remain unanswered: whether both activities are coeval or whether one precedes the other, what their characteristic timescales are, and what kinds of physical processes are responsible for this interplay. Aims. We examine stellar and BH masses (M_star and M_BH) in z~2 active systems at the peak of their AGN or star formation activity to investigate how they are linked and whether AGN radiative or else radio power provides a feedback mechanism that regulates the stellar growth in these systems. Methods. We analyze the infrared (IR) spectral energy distributions of radio, sub-millimeter and mid-IR selected AGNs at z~1-3 and constrain their stellar and AGN luminosities using AGN and host-galaxy templates. Results. We find evidence of increasing stellar light, thereby decreasing the AGN mid-IR power going from mid-IR selected AGNs, to radio galaxies, and to sub-millimeter AGNs. This trend can be explained by either decreasing Eddington ratios or increasing offsets from the local M_BH-M_star relation. All systems are characterized by high star formation rates regardless of their different AGN powers, thus neither AGN radiative power nor AGN-driven radio activity seems to influence the star formation rate in the selected AGNs. We discuss two possible evolutionary scenarios that might link these three AGN classes.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:56:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Polletta", "M.", "", "IAP, France & INAF-IASF Milano, Italy" ] ]
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802.0694
Ivan Savov
Ivan Savov
Distributed Compression and Squashed Entanglement
M.Sc thesis submitted to the Physics department of McGill University, 107 pages, 14 figures
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A single quantum state can be shared by many distant parties. In this thesis, we try to characterize the information contents of such distributed states by defining the multiparty information and the multiparty squashed entanglement, two steps toward a general theory of multiparty quantum information. As a further step in that direction, we partially solve the multiparty distributed compression problem where multiple parties use quantum communication to faithfully transfer their shares of a state to a common receiver. We build a protocol for multiparty distributed compression based on the fully quantum Slepian-Wolf protocol and prove both inner and outer bounds on the achievable rate region. We relate our findings to previous results in information theory and discuss some possible applications.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 18:59:45 GMT" } ]
2008-02-06T00:00:00
[ [ "Savov", "Ivan", "" ] ]
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802.0695
Petr Jizba
Petr Jizba and Hagen Kleinert
Superpositions of Probability Distributions
23 pages, RevTeX, minor changes, accepted to Phys. Rev. E
Phys. Rev. E 78 (2008) 031122
10.1103/PhysRevE.78.031122
null
cond-mat.other cond-mat.stat-mech math-ph math.MP quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Probability distributions which can be obtained from superpositions of Gaussian distributions of different variances v = \sigma ^2 play a favored role in quantum theory and financial markets. Such superpositions need not necessarily obey the Chapman-Kolmogorov semigroup relation for Markovian processes because they may introduce memory effects. We derive the general form of the smearing distributions in v which do not destroy the semigroup property. The smearing technique has two immediate applications. It permits simplifying the system of Kramers-Moyal equations for smeared and unsmeared conditional probabilities, and can be conveniently implemented in the path integral calculus. In many cases, the superposition of path integrals can be evaluated much easier than the initial path integral. Three simple examples are presented, and it is shown how the technique is extended to quantum mechanics.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 19:14:12 GMT" }, { "version": "v2", "created": "Wed, 27 Aug 2008 14:59:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Jizba", "Petr", "" ], [ "Kleinert", "Hagen", "" ] ]
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802.0696
Giorgio Sonnino
Giorgio Sonnino and Philippe Peeters
Nonlinear Transport Processes in Tokamak Plasmas. Part I: The Collisional Regimes
52 pages, 18 figures
null
10.1063/1.2939377
ULB-TH/08-02
physics.plasm-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An application of the thermodynamic field theory (TFT) to transport processes in L-mode tokamak plasmas is presented. The nonlinear corrections to the linear (Onsager) transport coefficients in the collisional regimes are derived. A quite encouraging result is the appearance of an asymmetry between the Pfirsch-Schlueter (P-S) ion and electron transport coefficients: the latter presents a nonlinear correction, which is absent for the ions, and makes the radial electron coefficients much larger than the former. Explicit calculations and comparisons between the neoclassical results and the TFT predictions for JET plasmas are also reported. We found that the nonlinear electron P-S transport coefficients exceed the values provided by neoclassical theory by a factor, which may be of the order 100. The nonlinear classical coefficients exceed the neoclassical ones by a factor, which may be of order 2. The expressions of the ion transport coefficients, determined by the neoclassical theory in these two regimes, remain unaltered. The low-collisional regimes i.e., the plateau and the banana regimes, are analyzed in the second part of this work.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 19:35:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Sonnino", "Giorgio", "" ], [ "Peeters", "Philippe", "" ] ]
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802.0697
Andreas Axelsson
Pascal Auscher, Andreas Axelsson, Alan McIntosh
A new approach to solvability of some elliptic pde's with square integrable boundary data
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn, and is replaced with paper "Solvability of elliptic systems with square integrable boundary data" by the same authors.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 20:10:20 GMT" }, { "version": "v2", "created": "Mon, 29 Sep 2008 13:31:39 GMT" } ]
2008-09-29T00:00:00
[ [ "Auscher", "Pascal", "" ], [ "Axelsson", "Andreas", "" ], [ "McIntosh", "Alan", "" ] ]
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802.0698
Annette Ferguson
Mike Irwin, Annette Ferguson, Avon Huxor, Nial Tanvir, Rodrigo Ibata, Geraint Lewis
Andromeda XVII: A New Low Luminosity Satellite of M31
5 pages, ApJL acccepted
null
10.1086/587100
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the discovery of a new dwarf spheroidal galaxy near M31 based on INT/WFC imaging. The system, Andromeda XVII (And XVII), is located at a projected radius of ~44 kpc from M31 and has a line-of-sight distance of 794+/-40 kpc measured using the tip of the red giant branch, and therefore lies well within the halo of M31. The colour of the red giant branch implies a metallicity of [Fe/H]~-1.9 and we find an absolute magnitude of M_v~ -8.5. Three globular clusters lie near the main body of And XVII, suggesting a possible association; if any of these are confirmed, it would make And XVII exceptionally unusual amongst the faint dSph population. The projected position on the sky of And XVII strengthens an intriguing alignment apparent in the satellite system of M31, although with a caveat about biases stemming from the current area surveyed to significant depth.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 23:55:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Irwin", "Mike", "" ], [ "Ferguson", "Annette", "" ], [ "Huxor", "Avon", "" ], [ "Tanvir", "Nial", "" ], [ "Ibata", "Rodrigo", "" ], [ "Lewis", "Geraint", "" ] ]
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802.0699
Massimiliano Esposito
Massimiliano Esposito and Katja Lindenberg
Continuous time random walk for open systems: Fluctuation theorems and counting statistics
1 figure ; v2: version accepted in Phys.Rev.E
Phys. Rev. E 77, 051119 (2008)
10.1103/PhysRevE.77.051119
null
cond-mat.stat-mech
null
We consider continuous time random walks (CTRW) for open systems that exchange energy and matter with multiple reservoirs. Each waiting time distribution (WTD) for times between steps is characterized by a positive parameter a, which is set to a=1 if it decays at least as fast as t^{-2} at long times and therefore has a finite first moment. A WTD with a<1 decays as t^{-a-1}. A fluctuation theorem for the trajectory quantity R, defined as the logarithm of the ratio of the probability of a trajectory and the probability of the time reversed trajectory, holds for any CTRW. However, R can be identified as a trajectory entropy change only if the WTDs have a=1 and satisfy separability (also called "direction time independence"). For nonseparable WTDs with a=1, R can only be identified as a trajectory entropy change at long times, and a fluctuation theorem for the entropy change then only holds at long times. For WTDs with 0<a<1 no meaningful fluctuation theorem can be derived. We also show that the (experimentally accessible) n'th moments of the energy and matter transfers between the system and a given reservoir grow as t^{n a} at long times.
[ { "version": "v1", "created": "Wed, 6 Feb 2008 00:52:51 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 21:05:20 GMT" } ]
2010-03-01T00:00:00
[ [ "Esposito", "Massimiliano", "" ], [ "Lindenberg", "Katja", "" ] ]
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802.07
Wei Zhang
G.-D. Lin, Wei Zhang, and L.-M. Duan
Characteristics of Bose-Einstein condensation in an optical lattice
12 pages, 13 figures; Revised version with new figures; Phys. Rev. A 77, 043626 (2008)
Phys. Rev. A 77, 043626 (2008)
10.1103/PhysRevA.77.043626
null
cond-mat.supr-con cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss several possible experimental signatures of the Bose-Einstein condensation (BEC) transition for an ultracold Bose gas in an inhomogeneous optical lattice. Based on the commonly used time-of-flight imaging technique, we show that the momentum-space density profile in the first Brillouin zone, supplemented by the visibility of interference patterns, provides valuable information about the system. In particular, by crossing the BEC transition temperature, the appearance of a clear bimodal structure sets a qualitative and universal signature of this phase transition. Furthermore, the momentum distribution can also be applied to extract the condensate fraction, which may serve as a promising thermometer in such a system.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 21:33:02 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 17:15:53 GMT" } ]
2008-05-21T00:00:00
[ [ "Lin", "G. -D.", "" ], [ "Zhang", "Wei", "" ], [ "Duan", "L. -M.", "" ] ]
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802.0701
Andrew Norris
Andrew N. Norris
Acoustic cloaking in 2D and 3D using finite mass
4 pages, 2 figures
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fundamental features of rotationally symmetric acoustic cloaks with anisotropic inertia are derived. Two universal relations are found to connect the radial and transverse phase speeds and the bulk modulus in the cloak. Perfect cloaking occurs only if the radial component of the density becomes infinite at the cloak inner boundary, requiring an infinitely massive cloak. A practical cloak of finite mass is defined in terms of its effective visible radius, which vanishes for perfect cloaking. Significant cloaking is obtained when the effective visible radius is subwavelength, reducing the total scattering cross section, and may be achieved even as the interior radius of the cloak is large relative to the wavelength. Both 2D vs. 3D effects are compared as we illustrate how the spatial dependence of the cloaking parameters effect the total cross section.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 21:23:29 GMT" } ]
2008-02-07T00:00:00
[ [ "Norris", "Andrew N.", "" ] ]
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802.0702
Dan Hooper
Dan Hooper and Edward A. Baltz
Strategies for Determining the Nature of Dark Matter
25 pages, 5 figures, Review intended for the Annual Review of Nuclear and Particle Science
Ann.Rev.Nucl.Part.Sci.58:293-314,2008
10.1146/annurev.nucl.58.110707.171217
FERMILAB-PUB-08-026-A
hep-ph astro-ph
null
In this review, we discuss the role of the various experimental programs taking part in the broader effort to identify the particle nature of dark matter. In particular, we focus on electroweak scale dark matter particles and discuss a wide range of search strategies being carried out and developed to detect them. These efforts include direct detection experiments, which attempt to observe the elastic scattering of dark matter particles with nuclei, indirect detection experiments, which search for photons, antimatter and neutrinos produced as a result of dark matter annihilations, and collider searches for new TeV-scale physics. Each of these techniques could potentially provide a different and complementary set of information related to the mass, interactions and distribution of dark matter. Ultimately, it is hoped that these many different tools will be used together to conclusively identify the particle or particles that constitute the dark matter of our universe.
[ { "version": "v1", "created": "Tue, 5 Feb 2008 21:27:40 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 17:46:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Hooper", "Dan", "" ], [ "Baltz", "Edward A.", "" ] ]
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