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802.1603
Robert Cameron
R. Cameron, L. Gizon, T.L. Duvall Jr
Helioseismology of Sunspots: Confronting Observations with Three-Dimensional MHD Simulations of Wave Propagation
21 pages, Accepted in Solar Physics
null
10.1007/s11207-008-9148-1
null
astro-ph
null
The propagation of solar waves through the sunspot of AR 9787 is observed using temporal cross-correlations of SOHO/MDI Dopplergrams. We then use three-dimensional MHD numerical simulations to compute the propagation of wave packets through self-similar magneto-hydrostatic sunspot models. The simulations are set up in such a way as to allow a comparison with observed cross-covariances (except in the immediate vicinity of the sunspot). We find that the simulation and the f-mode observations are in good agreement when the model sunspot has a peak field strength of 3 kG at the photosphere, less so for lower field strengths. Constraining the sunspot model with helioseismology is only possible because the direct effect of the magnetic field on the waves has been fully taken into account. Our work shows that the full-waveform modeling of sunspots is feasible.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 10:04:22 GMT" } ]
2009-11-13T00:00:00
[ [ "Cameron", "R.", "" ], [ "Gizon", "L.", "" ], [ "Duvall", "T. L.", "Jr" ] ]
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802.1604
Constantinos Daskalakis
Constantinos Daskalakis, Grant Schoenebeck, Gregory Valiant, Paul Valiant
On the Complexity of Nash Equilibria of Action-Graph Games
null
null
null
null
cs.GT cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of computing Nash Equilibria of action-graph games (AGGs). AGGs, introduced by Bhat and Leyton-Brown, is a succinct representation of games that encapsulates both "local" dependencies as in graphical games, and partial indifference to other agents' identities as in anonymous games, which occur in many natural settings. This is achieved by specifying a graph on the set of actions, so that the payoff of an agent for selecting a strategy depends only on the number of agents playing each of the neighboring strategies in the action graph. We present a Polynomial Time Approximation Scheme for computing mixed Nash equilibria of AGGs with constant treewidth and a constant number of agent types (and an arbitrary number of strategies), together with hardness results for the cases when either the treewidth or the number of agent types is unconstrained. In particular, we show that even if the action graph is a tree, but the number of agent-types is unconstrained, it is NP-complete to decide the existence of a pure-strategy Nash equilibrium and PPAD-complete to compute a mixed Nash equilibrium (even an approximate one); similarly for symmetric AGGs (all agents belong to a single type), if we allow arbitrary treewidth. These hardness results suggest that, in some sense, our PTAS is as strong of a positive result as one can expect.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 09:45:36 GMT" } ]
2008-02-13T00:00:00
[ [ "Daskalakis", "Constantinos", "" ], [ "Schoenebeck", "Grant", "" ], [ "Valiant", "Gregory", "" ], [ "Valiant", "Paul", "" ] ]
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802.1605
Yves Colin De Verdiere
Yves Colin De Verdi\`ere (IF), Victor Guillemin
A semi-classical inverse problem I: Taylor expansions
15 pages
null
null
null
math-ph math.AP math.MP math.SP
null
In dimension 1, we show that the Taylor expansion of a potential near a generic non degenerate critical point can be recovered from the knowledge of the semi-classical spectrum of the associated Schr\"odinger operator near the corresponding critical value.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 09:46:49 GMT" } ]
2008-02-13T00:00:00
[ [ "De Verdière", "Yves Colin", "", "IF" ], [ "Guillemin", "Victor", "" ] ]
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802.1606
Chang Ho Hyun
C. H. Hyun, B. Desplanques, S. Ando, C.-P. Liu
The old and the new of parity-violating two-pion-exchange $NN$ potential
4 pages, contribution to the conference Chiral07 held in Osaka, Japan, Nov. 13-16, 2007
Mod.Phys.Lett.A23:2293-2296,2008
10.1142/S0217732308029228
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the parity-violating two-pion-exchange potential obtained from the covariant formalism in the past and the state-of-the-art effective field theory approach. We discuss the behavior of the potential in coordinate space and its application to the parity-violating asymmetry in $\vec{n} p \to d \gamma$ at threshold.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 09:46:54 GMT" } ]
2009-01-30T00:00:00
[ [ "Hyun", "C. H.", "" ], [ "Desplanques", "B.", "" ], [ "Ando", "S.", "" ], [ "Liu", "C. -P.", "" ] ]
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802.1607
Marta Sanz-Sol\'e
Marta Sanz-Sol\'e
Properties of the density for a three dimensional stochastic wave equation
29 pages
null
null
null
math.PR math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a stochastic wave equation in space dimension three driven by a noise white in time and with an absolutely continuous correlation measure given by the product of a smooth function and a Riesz kernel. Let $p_{t,x}(y)$ be the density of the law of the solution $u(t,x)$ of such an equation at points $(t,x)\in]0,T]\times \IR^3$. We prove that the mapping $(t,x)\mapsto p_{t,x}(y)$ owns the same regularity as the sample paths of the process $\{u(t,x), (t,x)\in]0,T]\times \mathbbR^3\}$ established Dalang and Sanz-Sol\'e [Memoirs of the AMS, to appear]. The proof relies on Malliavin calculus and more explicitely, Watanabe's integration by parts formula and estimates derived form it.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 09:48:21 GMT" } ]
2008-02-13T00:00:00
[ [ "Sanz-Solé", "Marta", "" ] ]
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802.1608
Luis Escauriaza
L. Escauriaza, C. E. Kenig, G. Ponce, L. Vega
Hardy's Uncertainty Principle, Convexity and Schr\"odinger Evolutions
null
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove the logarithmic convexity of certain quantities, which measure the quadratic exponential decay at infinity and within two characteristic hyperplanes of solutions of Schr\"odinger evolutions. As a consequence we obtain some uniqueness results that generalize (a weak form of) Hardy's version of the uncertainty principle. We also obtain corresponding results for heat evolutions.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 09:49:42 GMT" } ]
2008-02-13T00:00:00
[ [ "Escauriaza", "L.", "" ], [ "Kenig", "C. E.", "" ], [ "Ponce", "G.", "" ], [ "Vega", "L.", "" ] ]
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802.1609
Jun Suzuki
Jun Suzuki, Gelo Noel Macuja Tabia, Berthold-Georg Englert
Symmetric construction of reference-frame-free qudits
5 pages, typos corrected
Phys. Rev. A 78, 052328 (2008)
10.1103/PhysRevA.78.052328
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By exploiting a symmetric scheme for coupling $N$ spin-1/2 constituents (the physical qubits) to states with total angular momentum $N/2-1$, we construct rotationally invariant logical qudits of dimension $d=N-1$. One can encode all qudit states, and realize all qudit measurements, by this construction. The rotational invariance of all relevant objects enables one to transmit quantum information without having aligned reference frames between the parties that exchange the qudits. We illustrate the method by explicit constructions of reference-frame-free qubits and qutrits and, for the qubit case, comment on possible experimental implementations.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 09:59:24 GMT" }, { "version": "v2", "created": "Fri, 17 Oct 2008 02:14:09 GMT" } ]
2008-11-25T00:00:00
[ [ "Suzuki", "Jun", "" ], [ "Tabia", "Gelo Noel Macuja", "" ], [ "Englert", "Berthold-Georg", "" ] ]
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802.161
Lan Zhou
Jing Lu, Lan Zhou, Le-Man Kuang, C. P. Sun
Controlling soliton excitations in Heisenberg spin chain through magic angle
7 pages 4 figures
Physical Review E 79, 016606 (2009)
10.1103/PhysRevE.79.016606
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the nonlinear dynamics of collective excitation in a $N$-site $XXZ$ quantum spin chain, which is manipulated by an oblique magnetic field. We show that, when the tilted field is applied along the magic angle $\theta_{0} =\pm\arccos \sqrt{1/3}$, the anisotropic Heisenberg spin chain becomes isotropic and thus an free propagating spin wave is stimulated. And in the regime of the tilted angle larger and smaller then the magic angle, two types of nonlinear excitations appear, which are bright soliton and dark soliton.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 10:28:32 GMT" }, { "version": "v2", "created": "Mon, 26 May 2008 05:24:34 GMT" }, { "version": "v3", "created": "Thu, 19 Jun 2008 07:32:45 GMT" }, { "version": "v4", "created": "Sun, 15 Feb 2009 16:22:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Lu", "Jing", "" ], [ "Zhou", "Lan", "" ], [ "Kuang", "Le-Man", "" ], [ "Sun", "C. P.", "" ] ]
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802.1611
Christian Forss\'en
C. Forss\'en and J. P. Vary and E. Caurier and P. Navr\'atil
Converging sequences in the ab initio no-core shell model
null
Phys.Rev.C77:024301,2008
10.1103/PhysRevC.77.024301
null
nucl-th
null
We demonstrate the existence of multiple converging sequences in the ab initio no-core shell model. By examining the underlying theory of effective operators, we expose the physical foundations for the alternative pathways to convergence. This leads us to propose a revised strategy for evaluating effective interactions for $A$-body calculations in restricted model spaces. We suggest that this strategy is particularly useful for applications to nuclear processes in which states of both parities are used simultaneously, such as for transition rates. We demonstrate the utility of our strategy with large-scale calculations in light nuclei.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 10:35:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Forssén", "C.", "" ], [ "Vary", "J. P.", "" ], [ "Caurier", "E.", "" ], [ "Navrátil", "P.", "" ] ]
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802.1612
Christian Mercat
Christian Mercat (I3M)
Discrete Riemann Surfaces
null
Handbook of Teichm\"uller theory. Vol. I, Eur. Math. Soc., Z\"urich (Ed.) (2007) 541--575
null
null
math.CV math-ph math.DG math.MP
null
We detail the theory of Discrete Riemann Surfaces. It takes place on a cellular decomposition of a surface, together with its Poincar\'e dual, equipped with a discrete conformal structure. A lot of theorems of the continuous theory follow through to the discrete case, we define the discrete analogs of period matrices, Riemann's bilinear relations, exponential of constant argument and series. We present the notion of criticality and its relationship with integrability.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 10:36:56 GMT" } ]
2008-02-13T00:00:00
[ [ "Mercat", "Christian", "", "I3M" ] ]
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802.1613
Laura Tolos
Laura Tolos, Angels Ramos and Tetsuro Mizutani
Charm mesons at FAIR
4 pages, 3 figures, contribution to the proceedings of Chiral07, RCNP, Osaka, Japan, November 13-16, 2007
Mod.Phys.Lett.A23:2250-2253,2008
10.1142/S0217732308029137
null
nucl-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The in-medium properties of charm mesons ($D$ and $\bar D$) in a hot and dense matter are studied. A self-consistent coupled-channel approach is driven by a broken SU(4) s-wave Tomozawa-Weinberg interaction supplemented by an attractive isoscalar-scalar term. As medium effects, we include Pauli blocking, baryon mean-field bindings, and $\pi$ and open-charm meson self-energies. The dynamically generated $\tilde\Lambda_c$ and $\tilde\Sigma_c$ resonances in the $DN$ sector remain close to their free space position but acquire large widths. The resultant $D$ meson spectral function, which shows a single pronounced quasiparticle peak close to the free mass that broadens with increasing density, also has a long low energy tail associated with smeared $\tilde\Lambda_c N^{-1}$, $\tilde\Sigma_c N^{-1}$ configurations. The low-density approximation for the $\bar D N$ is questionable already at subsaturation densities. We touch upon the implication of our study for $J/\Psi$ suppression at FAIR.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 10:42:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Tolos", "Laura", "" ], [ "Ramos", "Angels", "" ], [ "Mizutani", "Tetsuro", "" ] ]
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802.1614
Raymond Burston
R. Burston, L. Gizon, T. Appourchaux, W.T. Ni, ASTROD I ESA cosmic vision 2015-2025 team
Detecting solar g-modes with ASTROD
HELAS II international conference "Helioseismology, asteroseismology and MHD connections", 20-24 August 2007, Goettingen, Germany
J.Phys.Conf.Ser.118:012043,2008
10.1088/1742-6596/118/1/012043
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an up-to-date estimate for the prospect of using the Astrodynamical Space Test of Relativity using Optical Devices (ASTROD) for an unambiguous detection of solar g modes (f < 400 micro Hertz) through their gravitational signature. There are currently two major efforts to detect low-frequency gravitational effects, ASTROD and the Laser Interferometer Space Antenna (LISA). Using the most recent g mode surface amplitude estimates, both observational and theoretical, it is unclear whether LISA will be capable of successfully detecting these modes. The ASTROD project may be better suited for detection as its sensitivity curve is shifted towards lower frequencies with the best sensitivity occurring in the range 100-300 micro Hertz.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 10:54:27 GMT" } ]
2009-06-23T00:00:00
[ [ "Burston", "R.", "" ], [ "Gizon", "L.", "" ], [ "Appourchaux", "T.", "" ], [ "Ni", "W. T.", "" ], [ "team", "ASTROD I ESA cosmic vision 2015-2025", "" ] ]
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802.1615
Jan Mandel
Jonathan D. Beezley, Soham Chakraborty, Janice L. Coen, Craig C. Douglas, Jan Mandel, Anthony Vodacek, Zhen Wang
Real-Time Data Driven Wildland Fire Modeling
8 pages, 4 figures. ICCS 08
Proceedings ICCS 2008. Lecture Notes in Computer Science vol 5103 pp 46-53 2008.
10.1007/978-3-540-69389-5_7
null
physics.ao-ph physics.comp-ph
null
We are developing a wildland fire model based on semi-empirical relations that estimate the rate of spread of a surface fire and post-frontal heat release, coupled with WRF, the Weather Research and Forecasting atmospheric model. A level set method identifies the fire front. Data are assimilated using both amplitude and position corrections using a morphing ensemble Kalman filter. We will use thermal images of a fire for observations that will be compared to synthetic image based on the model state.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:08:00 GMT" } ]
2009-01-09T00:00:00
[ [ "Beezley", "Jonathan D.", "" ], [ "Chakraborty", "Soham", "" ], [ "Coen", "Janice L.", "" ], [ "Douglas", "Craig C.", "" ], [ "Mandel", "Jan", "" ], [ "Vodacek", "Anthony", "" ], [ "Wang", "Zhen", "" ] ]
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802.1616
Eberhard Mayerhofer
Eberhard Mayerhofer
The wave equation on static singular space-times
102 pages, 4 figures, PhD Thesis, concise introduction
PhD thesis, University of Vienna, 2006
null
null
math.GM math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The first part of my thesis lays the foundations to generalized Lorentz geometry. The basic algebraic structure of finite-dimensional modules over the ring of generalized numbers is investigated. The motivation for this part of my thesis evolved from the main topic, the wave equation on singular space-times. The second and main part of my thesis is devoted to establishing a local existence and uniqueness theorem for the wave equation on singular space-times. The singular Lorentz metric subject to our discussion is modeled within the special algebra on manifolds in the sense of Colombeau. Inspired by an approach to generalized hyperbolicity of conical-space times due to Vickers and Wilson, we succeed in establishing certain energy estimates, which by a further elaborated equivalence of energy integrals and Sobolev norms allow us to prove existence and uniqueness of local generalized solutions of the wave equation with respect to a wide class of generalized metrics. The third part of my thesis treats three different point value resp. uniqueness questions in algebras of generalized functions
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:03:24 GMT" } ]
2021-01-12T00:00:00
[ [ "Mayerhofer", "Eberhard", "" ] ]
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802.1617
Christian Mercat
Christian Mercat (I3M)
Discrete Complex Structure on Surfel Surfaces
null
Dans 14th IAPR International Conference on Discrete Geometry for Computer Imagery - 14th IAPR International Conference on Discrete Geometry for Computer Imagery, Lyon : France (2008)
null
null
cs.CG cs.GR math.CV
null
This paper defines a theory of conformal parametrization of digital surfaces made of surfels equipped with a normal vector. The main idea is to locally project each surfel to the tangent plane, therefore deforming its aspect-ratio. It is a generalization of the theory known for polyhedral surfaces. The main difference is that the conformal ratios that appear are no longer real in general. It yields a generalization of the standard Laplacian on weighted graphs.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:06:38 GMT" } ]
2008-02-18T00:00:00
[ [ "Mercat", "Christian", "", "I3M" ] ]
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802.1618
Hashem Zoubi
Hashem Zoubi and Helmut Ritsch
Coupling of Electronic and Motional Dynamics in a Cold Atom Optical Lattice
4 pages, 5 figures
Phys. Rev. A 79, 023411 (2009).
10.1103/PhysRevA.79.023411
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the coupling of internal electronic excitations to vibrational modes of the external motion of ultracold atoms in an optical lattice. For different ground and excited state potentials the on-site coupling of excitations and vibrations term renormalizes the effective electronic transition energy, which appears e.g. in clock transitions. In addition in the Mott state with filling factor one, the dipole-dipole coupling between neighbouring sites includes emission and absorption of vibrational quanta. Such processes create a significant mechanism for excitation of vibrations leading to motional heating of the lattice atoms by resonant light interaction. We calculate estimates of the corresponding parameters from a perturbation expansion in small atomic displacements.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:21:39 GMT" } ]
2009-08-11T00:00:00
[ [ "Zoubi", "Hashem", "" ], [ "Ritsch", "Helmut", "" ] ]
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802.1619
G. Griffith Elder
G. Griffith Elder
A valuation criterion for normal basis generators in local fields of characteristic $p$
null
null
null
null
math.NT math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $K$ be a complete local field of characteristic $p$ with perfect residue field. Let $L/K$ be a finite, fully ramified, Galois $p$-extension. If $\pi_L\in L$ is a prime element, and $p'(x)$ is the derivative of $\pi_L$'s minimal polynomial over $K$, then the relative different $\euD_{L/K}$ is generated by $p'(\pi_L)\in L$. Let $v_L$ be the normalized valuation normalized with $v_L(L)=\mathbb{Z}$. We show that any element $\rho\in L$ with $v_L(\rho)\equiv -v_L(p'(\pi_L))-1\bmod[L:K]$ generates a normal basis, $K[{Gal}(L/K)]\cdot\rho=L$. This criterion is tight: Given any integer $i$ such that $i\not\equiv -v_L(p'(\pi_L))-1\bmod[L:K]$, there is a $\rho_i\in L$ with $v_L(\rho_i)=i$ such that $K[{Gal}(L/K)]\cdot\rho_i\subsetneq L$.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:50:27 GMT" } ]
2008-02-13T00:00:00
[ [ "Elder", "G. Griffith", "" ] ]
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802.162
Andreas Schadschneider
Andreas Schadschneider, Wolfram Klingsch, Hubert Kluepfel, Tobias Kretz, Christian Rogsch, and Armin Seyfried
Evacuation Dynamics: Empirical Results, Modeling and Applications
57 pages, 19 figures; to appear in: ``Encyclopedia of Complexity and System Science'', B. Meyers (Ed.) (Springer, Berlin, 2008); for more information and a version with high quality figures, see <http://www.ped-net.org>
Encyclopedia of Complexity and Systems Science (Editor-in-Chief: R.A. Meyers), pages 3142-3176 (Springer 2009)
10.1016/j.ssci.2011.12.024
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This extensive review was written for the ``Encyclopedia of Complexity and System Science'' (Springer, 2008) and addresses a broad audience ranging from engineers to applied mathematicians, computer scientists and physicists. It provides an extensive overview of various aspects of pedestrian dynamics, focussing on evacuation processes. First the current status of empirical results is critically reviewed as it forms the basis for the calibration of models needed for quantitative predictions. Then various modeling approaches are discussed, focussing on cellular automata models. Finally, some specific applications to safety analysis in public buildings or public transport are presented.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:32:20 GMT" } ]
2012-02-15T00:00:00
[ [ "Schadschneider", "Andreas", "" ], [ "Klingsch", "Wolfram", "" ], [ "Kluepfel", "Hubert", "" ], [ "Kretz", "Tobias", "" ], [ "Rogsch", "Christian", "" ], [ "Seyfried", "Armin", "" ] ]
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802.1621
Hong Soo Park
Myung Gyoon Lee (1), Hong Soo Park (1), Eunhyeuk Kim (1), Ho Seong Hwang (1,2), Sang Chul Kim (3), Doug Geisler (4)((1) Seoul National Univ.,(2)Korea Institute for Advanced Study,(3)Korea Astronomy and Space Science Institute,(4)Univ. de Concepci)
Washington CCD Photometry of the Globular Cluster System of the Giant Elliptical Galaxy M60 in Virgo
32 pages, 22 figues, Accepted by ApJ
Astrophys.J.682:135-154,2008
10.1086/587469
null
astro-ph
null
We present a photometric study of the globular clusters in the giant elliptical galaxy M60 in the Virgo cluster, based on deep, relatively wide field Washington CT_1 CCD images. The color-magnitude diagram reveals a significant population of globular clusters in M60, and a large number of young luminous clusters in NGC 4647, a small companion spiral galaxy north-west of M60. The color distribution of the globular clusters in M60 is clearly bimodal, with a blue peak at (C-T_1)=1.37, and a red peak at (C-T_1)=1.87. We derive two new transformation relations between the (C-T_1)_0 color and [Fe/H] using the data for the globular clusters in our Galaxy and M49. Using these relations we derive the metallicity distribution of the globular clusters in M60, which is also bimodal: a dominant metal-poor component with center at [Fe/H]=-1.2, and a weaker metal-rich component with center at [Fe/H]=-0.2. The radial number density profile of the globular clusters is more extended than that of the stellar halo, and the radial number density profile of the blue globular clusters is more extended than that of the red globular clusters. The number density maps of the globular clusters show that the spatial distribution of the blue globular clusters is roughly circular, while that of the red globular cluster is elongated similarly to that of the stellar halo. We estimate the total number of the globular clusters in M60 to be 3600+/-500$,and the specific frequency to be S_N=3.8+/-0.4. The mean color of the bright blue globular clusters gets redder as they get brighter in both the inner and outer region of M60. This blue tilt is seen also in the outer region of M49, the brightest Virgo galaxy. Implications of these results are discussed.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:52:23 GMT" } ]
2010-11-11T00:00:00
[ [ "Lee", "Myung Gyoon", "" ], [ "Park", "Hong Soo", "" ], [ "Kim", "Eunhyeuk", "" ], [ "Hwang", "Ho Seong", "" ], [ "Kim", "Sang Chul", "" ], [ "Geisler", "Doug", "" ] ]
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802.1622
Michele Fumagalli
Giuseppe Gavazzi (1), Riccardo Giovanelli (2), Martha P. Haynes (2), Silvia Fabello (1), Michele Fumagalli (1), Brian R. Kent (2), Rebecca A. Koopmann (3), Noah Brosch (4), G. Lyle Hoffman (5), John J. Salzer (6) and Alessandro Boselli (7) ((1) Universita degli Studi di Milano-Bicocca, Italy (2) Cornell University (3) Union College (4) The Wise Observatory, Israel (5) Lafayette College (6) Wesleyan University (7) Laboratoire d'Astrophysique de Marseille, France)
HI content and other structural properties of galaxies in the Virgo cluster from the Arecibo Legacy Fast ALFA Survey
10 pages, 10 Postscript figures, accepted for publication in Astronomy and Astrophysics (25/01/2008) - Replaced to fit A&A vers. 6.1
null
10.1051/0004-6361:200809382
null
astro-ph
null
We report the results of an HI blind survey of 80deg^2 of the Virgo cluster, based on the 08deg < delta < 16 deg strip of ALFALFA, the Arecibo Legacy Fast ALFA Survey. 187 HI sources of high significance are found providing a complete census of HI sources in this region of the Virgo cluster (-1000<cz<3000 km/s) with M_HI > 10^7.5-8 M_sun. 156/187 (83%) sources are identified with optical galaxies from the Virgo Cluster Catalogue (Binggeli et al. 1985), all but 8 with late-type galaxies. Ten sources are not associated with optical galaxies and were found to correspond to tidally-disrupted systems (see Kent et al. 2007 and Haynes, Giovanelli and Kent 2007). The remaining 21 (11%) are associated with galaxies that are not listed in the Virgo Cluster Catalogue. For all sources with an optical counterpart in the Sloan Digital Sky Survey, we analyzed i-band SDSS plates to measure optical structural parameters. We find that in the Virgo cluster: i) HI inhabits galaxies that are structurally similar to ordinary late-type galaxies; ii) their HI content can be predicted from their optical luminosity; iii) low surface brightness galaxies have low optical luminosity and contain small quantities of neutral hydrogen; iv) low surface brightness, massive Malin1 type galaxies are comfortably rare objects (less than 0.5%); v) there are no "dark-galaxies" with HI masses M_HI > 10^7.5-8 M_sun; vi) less than 1% of early-type galaxies contain neutral hydrogen with M_HI>10^7.5-8 M_sun (di Serego Alighieri et al. 2007).
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:42:07 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 11:21:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Gavazzi", "Giuseppe", "" ], [ "Giovanelli", "Riccardo", "" ], [ "Haynes", "Martha P.", "" ], [ "Fabello", "Silvia", "" ], [ "Fumagalli", "Michele", "" ], [ "Kent", "Brian R.", "" ], [ "Koopmann", "Rebecca A.", "" ], [ "Brosch", "Noah", "" ], [ "Hoffman", "G. Lyle", "" ], [ "Salzer", "John J.", "" ], [ "Boselli", "Alessandro", "" ] ]
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802.1623
Farhad Zolfagharour
F. Zolfagharpour
EMC effect with different oscillator-model parameters $h\omega$ for different shells by considering difference between proton and neutron structure functions
10 pages 4 figures
null
null
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The magnitude of binding energy used in the conventional nuclear theory to explain the EMC experimental data, seems to be larger than the one expected. In this paper to get sufficient depletion in the binding energy, different oscillator-model parameters $ \textit{$h\omega$} $ for different shells and the proton (neutron) structure function that have good agrement with experimental data are used. The extracted results for $^4He, ^{12}C, ^{40}Ca$ and $^{56}Fe$ nuclei show that one can get improved results in medium x ranges by less binding energy.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 11:51:19 GMT" }, { "version": "v2", "created": "Mon, 10 Mar 2008 08:03:34 GMT" } ]
2008-03-10T00:00:00
[ [ "Zolfagharpour", "F.", "" ] ]
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802.1624
Nils Carqueville
Nils Carqueville
Triangle-generation in topological D-brane categories
34 pages
JHEP0804:031,2008
10.1088/1126-6708/2008/04/031
null
hep-th
null
Tachyon condensation in topological Landau-Ginzburg models can generally be studied using methods of commutative algebra and properties of triangulated categories. The efficiency of this approach is demonstrated by explicitly proving that every D-brane system in all minimal models of type ADE can be generated from only one or two fundamental branes.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 12:31:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Carqueville", "Nils", "" ] ]
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802.1625
Dong-han Yeom
Dong-han Yeom, Heeseung Zoe
Constructing a counterexample to the black hole complementarity
8 pages, 5 figures
Phys.Rev.D78:104008,2008
10.1103/PhysRevD.78.104008
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a regular black hole whose inside generates a de Sitter space and then is finally frustrated into a singularity. It is a modified model which was suggested originally by Frolov, Markov, and Mukhanov. In our model, we could adjust a regular black hole so that its period before going into the extreme state is much longer than the information retention time. During this period an observer could exist who observes the information of the Hawking radiation, falls freely into the regular center of the black hole, and finally meets the free-falling information again. The existence of such an observer implies that the complementary view may not be consistent with a regular black hole, and therefore, is not appropriate as a generic principle of black hole physics.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:42:16 GMT" }, { "version": "v2", "created": "Fri, 19 Sep 2008 09:24:59 GMT" }, { "version": "v3", "created": "Mon, 10 Nov 2008 06:19:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Yeom", "Dong-han", "" ], [ "Zoe", "Heeseung", "" ] ]
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802.1626
Radu Slobodeanu Al.
Radu Slobodeanu
A special class of holomorphic mappings and the Faddeev-Hopf model
13 pages. The proof of Proposition 3.4 has been corrected
null
null
null
math.DG math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pseudo horizontally weakly conformal maps extend both holomorphic and (semi)conformal maps into an almost Hermitian manifold. We find in this larger class critical points for the (generalized) Faddeev-Hopf energy. Their stability is also discussed in some cases.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 12:35:48 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 21:58:07 GMT" }, { "version": "v3", "created": "Tue, 13 May 2008 21:01:08 GMT" }, { "version": "v4", "created": "Tue, 4 Nov 2008 18:18:04 GMT" }, { "version": "v5", "created": "Thu, 18 Jul 2013 16:12:53 GMT" } ]
2013-07-19T00:00:00
[ [ "Slobodeanu", "Radu", "" ] ]
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802.1627
Eliecer Hernandez-Gajate
E. Hernandez, J. Nieves, M. Valverde
Neutrino induced weak pion production off the nucleon
4 latex pages, 2 figures. Contribution at Chiral Symmetry in Hadron and Nuclear Physics (CHIRAL07), Osaka, November 13-16, 2007
Mod.Phys.Lett.A23:2317-2320,2008
10.1142/S0217732308029289
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study neutrino induced one-pion production off the nucleon in and around the Delta resonance region. Apart from the Delta-pole mechanism we include background terms required by chiral symmetry. These background terms give sizeable contributions in all channels. To better reproduce the ANL $q^2$-differential cross section data, we make a new fit of the $C_5^A(q^2)$ axial nucleon to Delta form factor. The new result $C_5^A(0)=0.867\pm 0.075$ is some 30% smaller than the commonly accepted value. This correction is compatible with most quark model estimates and a recent lattice calculation
[ { "version": "v1", "created": "Tue, 12 Feb 2008 12:20:29 GMT" } ]
2008-11-26T00:00:00
[ [ "Hernandez", "E.", "" ], [ "Nieves", "J.", "" ], [ "Valverde", "M.", "" ] ]
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802.1628
Alexander Knebe
Alexander Knebe (AIP), Bastian Arnold (Vienna), Chris Power (Leicester), Brad K. Gibson (UCLan)
The Dynamics of Subhalos in Warm Dark Matter Models
10 pages, 11 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.13102.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a comparison of the properties of substructure halos (subhalos) orbiting within host halos that form in Cold Dark Matter (CDM) and Warm Dark Matter (WDM) cosmologies. Our study focuses on selected properties of these subhalos, namely their anisotropic spatial distribution within the hosts; the existence of a "backsplash'' population; the age-distance relation; the degree to which they suffer mass loss; and the distribution of relative (infall) velocities with respect to the hosts. We find that the number density of subhalos in our WDM model is suppressed relative to that in the CDM model, as we would expect. Interestingly, our analysis reveals that backsplash subhalos exist in both the WDM and CDM models. Indeed, there are no statistically significant differences between the spatial distributions of subhalos in the CDM and WDM models. There is evidence that subhalos in the WDM model suffer enhanced mass loss relative to their counterparts in the CDM model, reflecting their lower central densities. We note also a tendency for the (infall) velocities of subhalos in the WDM model to be higher than in the CDM model. Nevertheless, we conclude that observational tests based on either the spatial distribution or the kinematics of the subhalo population are unlikely to help us to differentiate between the CDM model and our adopted WDM model.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 12:39:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Knebe", "Alexander", "", "AIP" ], [ "Arnold", "Bastian", "", "Vienna" ], [ "Power", "Chris", "", "Leicester" ], [ "Gibson", "Brad K.", "", "UCLan" ] ]
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802.1629
Dmitry Knyazev A
D.A. Knyazev, O.E. Omel'yanovskii, V.M. Pudalov, I.S. Burmistrov
Metal-Insulator Transition in 2D: Experimental Test of the Two-Parameter Scaling
4 pages, 4 figures, 1 table
Phys. Rev. Lett. 100, 046405 (2008)
10.1103/PhysRevLett.100.046405
null
cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a detailed scaling analysis of resistivity \rho(T,n) measured for several high-mobility 2D electron systems in the vicinity of the 2D metal-insulator transition. We analyzed the data using the two parameter scaling approach and general scaling ideas. This enables us to determine the critical electron density, two critical indices, and temperature dependence for the separatrix in the self-consistent manner. In addition, we reconstruct the empirical scaling function describing a two-parameter surface which fits well the \rho(T,n) data.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 12:42:34 GMT" } ]
2013-03-08T00:00:00
[ [ "Knyazev", "D. A.", "" ], [ "Omel'yanovskii", "O. E.", "" ], [ "Pudalov", "V. M.", "" ], [ "Burmistrov", "I. S.", "" ] ]
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802.163
Ulrich Hohenester
Andreas Truegler and Ulrich Hohenester
Strong coupling between a metallic nanoparticle and a single molecule
6 pages, 4 figures
Phys. Rev. B 77, 115403 (2008)
10.1103/PhysRevB.77.115403
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically investigate strong coupling between a single molecule and a single metallic nanoparticle. A theory suited for the quantum-mechanical description of surface plasmon polaritons (SPPs) is developed. The coupling between these SPPs and a single molecule, and the modified molecular dynamics in presence of the nanoparticle are described within a combined Drude and boundary-element-method approach. Our results show that strong coupling is possible for single molecules and metallic nanoparticles, and can be observed in fluorescence spectroscopy through the splitting of emission peaks.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 12:43:38 GMT" } ]
2013-09-10T00:00:00
[ [ "Truegler", "Andreas", "" ], [ "Hohenester", "Ulrich", "" ] ]
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802.1631
Francois Sausset
Fran\c{c}ois Sausset (LPTMC), Gilles Tarjus (LPTMC)
Comment on "Correlation between Dynamic Heterogeneity and Medium-Range Order in Two-Dimensional Glass-Forming Liquids"
Comment to appear in PRL along with reply by Kawasaki et al
Physical Review Letters 100 (2008) 099601
10.1103/PhysRevLett.100.099601
null
cond-mat.stat-mech
null
In a recent letter, Kawasaki et al. (PRL 99, 215701 (2007)) study glass formation in a 2-dimensional (2D) model of polydisperse repulsive disks. They give numerical evidence for a direct relation between slowing down of the relaxation, extension of some medium-range order, and development of dynamic heterogeneities. We disagree with the authors' interpretation on two points which we believe to be potentially important for understanding the glass transition.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 12:46:58 GMT" } ]
2008-05-13T00:00:00
[ [ "Sausset", "François", "", "LPTMC" ], [ "Tarjus", "Gilles", "", "LPTMC" ] ]
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802.1632
Pei-Ming Ho
Tai-Chung Cheng, Pei-Ming Ho, Tze-Kei Lee
Nonlocal Particles as Strings
25 pages, Latex, minor changes
J.Phys.A42:055202,2009
10.1088/1751-8113/42/5/055202
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We find nonlocal particle theories with two dimensional conformal symmetry, including examples equivalent to the bosonic open string and closed string. This work provides a new approach to construct solvable consistent backgrounds in string theory.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:07:44 GMT" }, { "version": "v2", "created": "Sun, 24 Feb 2008 15:31:55 GMT" }, { "version": "v3", "created": "Thu, 23 Oct 2008 04:09:41 GMT" } ]
2009-01-08T00:00:00
[ [ "Cheng", "Tai-Chung", "" ], [ "Ho", "Pei-Ming", "" ], [ "Lee", "Tze-Kei", "" ] ]
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802.1633
Andrzej Grudka
Andrzej Grudka, Michal Horodecki, Pawel Horodecki, Ryszard Horodecki
Note on genuine multipartite classical correlations
null
null
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the problem of coexistence of genuine quantum multipartite correlations and classical multipartite correlations. We introduce a postulate which any measure of genuine multipartite classical correlations should satisfy. We show that covariance does not satisfy this postulate. Finally we propose a definition of genuine multipartite correlations and illustrate it with examples.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:11:16 GMT" } ]
2008-02-13T00:00:00
[ [ "Grudka", "Andrzej", "" ], [ "Horodecki", "Michal", "" ], [ "Horodecki", "Pawel", "" ], [ "Horodecki", "Ryszard", "" ] ]
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802.1634
Mario Novello
M. Novello and S.E.Perez Bergliaffa
Bouncing Cosmologies
Please send comments to [email protected] with copy to [email protected]
Phys.Rept.463:127-213,2008
10.1016/j.physrep.2008.04.006
null
astro-ph gr-qc hep-ph hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review the general features of nonsingular universes ({\em i.e.} those that go from an era of accelerated collapse to an expanding era without displaying a singularity) as well as cyclic universes. We discuss the mechanisms behind the bounce, and analyze examples of solutions that implement these mechanisms. Observational consequences of such regular cosmologies are also considered, with emphasis in the behavior of the perturbations.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:11:55 GMT" } ]
2008-12-18T00:00:00
[ [ "Novello", "M.", "" ], [ "Bergliaffa", "S. E. Perez", "" ] ]
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802.1635
Rodion Burenin
I. M. Khamitov, R. A. Burenin, I. F. Bikmaev, N. A. Sakhibullin, M. N. Pavlinsky, R. A. Sunyaev, Z. Aslan
Observations of GRB 060526 Optical Afterglow with Russian-Turkish 1.5-m Telescope
6 pages, 7 figures, Astronomy Letters, 2007, 33, 797, The on-line data tables and the original text in Russian can be found at http://hea.iki.rssi.ru/grb/060526/indexeng.html
Astronomy Letters, 2007, 33, 797
10.1134/S106377370712002X
null
astro-ph
null
We present the results of the photometric multicolor observations of GRB 060526 optical afterglow obtained with Russian-Turkish 1.5-m Telescope (RTT150, Mt. Bakirlitepe, Turkey). The detailed measurements of afterglow light curve, starting from about 5 hours after the GRB and during 5 consecutive nights were done. In addition, upper limits on the fast variability of the afterglow during the first night of observations were obtained and the history of afterglow color variations was measured in detail. In the time interval from 6 to 16 hours after the burst, there is a gradual flux decay, which can be described approximately as a power law with an index of -1.14+-0.02. After that the variability on the time scale \delta t < t is observed and the afterglow started to decay faster. The color of the afterglow, V-R=~0.5, is approximately the same during all our observations. The variability is detected on time scales up to \delta t/t =~ 0.0055 at \Delta F_\nu/F_\nu =~ 0.3, which violates some constraints on the variability of the observed emission from ultrarelativistic jet obtained by Ioka et al. (2005). We suggest to explain this variability by the fact that the motion of the emitting shell is no longer ultrarelativistic at this time.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:27:26 GMT" } ]
2008-02-13T00:00:00
[ [ "Khamitov", "I. M.", "" ], [ "Burenin", "R. A.", "" ], [ "Bikmaev", "I. F.", "" ], [ "Sakhibullin", "N. A.", "" ], [ "Pavlinsky", "M. N.", "" ], [ "Sunyaev", "R. A.", "" ], [ "Aslan", "Z.", "" ] ]
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802.1636
Rodion Burenin
R. A. Burenin
On the Variability of Gamma-Ray Burst Afterglows - A Possibility of a Transition to Nonrelativistic Motion
3 pages, Astronomy Letters, 33, 804, The original text in Russian can be found at http://hea.iki.rssi.ru/grb/060526/pgrbvar.pdf
Astronomy Letters, 2007, 33, 804
10.1134/S1063773707120031
null
astro-ph
null
Variability on time scales \delta t < t is observed in many gamma-ray burst afterglows. It is well known that there should be no such variability if the afterglow is emitted by external shock, which is produced by the interaction of ultrarelativistic ejecta with the ambient interstellar medium, within the framework of simple models. The corresponding constraints were established by Ioka et al. (2005) and in some cases are inconsistent with observations. On the other hand, if the motion is not relativistic, then the fast variability of the afterglow can be explained much more easily. In this connection we discuss various estimates of the time of the transition to subrelativistic motion in GRB source. We point out, that this transition should occur on an observed time scale of ~10 days. In the case of a higher density of the ambient interstellar medium ~10^2-10^4 cm^{-3} or dense stellar wind with \dot M ~ 10^{-5} - 10^{-4} M_\odot/year the transition to a subrelativistic motion can occur on a time scale of ~1 day. These densities may well be expected in star-forming regions and around massive Wolf-Rayet stars.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 14:09:43 GMT" } ]
2008-02-13T00:00:00
[ [ "Burenin", "R. A.", "" ] ]
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802.1637
Svante Janson
Svante Janson
Asymptotic equivalence and contiguity of some random graphs
21 pages
null
null
null
math.PR math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that asymptotic equivalence, in a strong form, holds between two random graph models with slightly differing edge probabilities under substantially weaker conditions than what might naively be expected. One application is a simple proof of a recent result by van den Esker, van der Hofstad and Hooghiemstra on the equivalence between graph distances for some random graph models.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:18:37 GMT" } ]
2008-02-13T00:00:00
[ [ "Janson", "Svante", "" ] ]
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802.1638
Oliver Jenkinson
Oscar F. Bandtlow, Oliver Jenkinson
Explicit eigenvalue estimates for transfer operators
19 pages, to appear in Advances in Mathematics
null
null
null
math.DS math.FA
null
We consider transfer operators acting on spaces of holomorphic functions, and provide explicit bounds for their eigenvalues. More precisely, if D is any open set in C^d, and L is a suitable transfer operator acting on Bergman space A^2(D), its eigenvalue sequence lambda_n(L) is bounded by |lambda_n(L)| \leq A\exp(-a n^{1/d}), where a, A are explicitly given.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:27:46 GMT" } ]
2008-02-13T00:00:00
[ [ "Bandtlow", "Oscar F.", "" ], [ "Jenkinson", "Oliver", "" ] ]
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802.1639
D.-A. Deckert
Angelo Bassi, D.-A. Deckert
Noise gates for decoherent quantum circuits
10 pages, 4 figures: journal reference added + some typos corrected
Phys. Rev. A 77, 032323 (2008)
10.1103/PhysRevA.77.032323
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A major problem in exploiting microscopic systems for developing a new technology based on the principles of Quantum Information is the influence of noise which tends to work against the quantum features of such systems. It becomes then crucial to understand how noise affects the evolution of quantum circuits: several techniques have been proposed among which stochastic differential equations (SDEs) can represent a very convenient tool. We show how SDEs naturally map any Markovian noise into a linear operator, which we will call a noise gate, acting on the wave function describing the state of the circuit, and we will discuss some examples. We shall see that these gates can be manipulated like any standard quantum gate, thus simplifying in certain circumstances the task of computing the overall effect of the noise at each stage of the protocol. This approach yields equivalent results to those derived from the Lindblad equation; yet, as we show, it represents a handy and fast tool for performing computations, and moreover, it allows for fast numerical simulations and generalizations to non Markovian noise. In detail we review the depolarizing channel and the generalized amplitude damping channel in terms of this noise gate formalism and show how these techniques can be applied to any quantum circuit.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 17:42:21 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 10:43:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Bassi", "Angelo", "" ], [ "Deckert", "D. -A.", "" ] ]
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802.164
Aleksey Zinger
R. Pandharipande and A. Zinger
Enumerative Geometry of Calabi-Yau 5-Folds
40 pages, 3 tables, 6 figures
null
null
null
math.AG math.SG
null
Gromov-Witten theory is used to define an enumerative geometry of curves in Calabi-Yau 5-folds. We find recursions for meeting numbers of genus 0 curves, and we determine the contributions of moving multiple covers of genus 0 curves to the genus 1 Gromov-Witten invariants. The resulting invariants, conjectured to be integral, are analogous to the previously defined BPS counts for Calabi-Yau 3 and 4-folds. We comment on the situation in higher dimensions where new issues arise. Two main examples are considered: the local Calabi-Yau P^2 with balanced normal bundle 3O(-1) and the compact Calabi-Yau hypersurface X_7 in P^6. In the former case, a closed form for our integer invariants has been conjectured by G. Martin. In the latter case, we recover in low degrees the classical enumeration of elliptic curves by Ellingsrud and Stromme.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:10:06 GMT" } ]
2008-02-13T00:00:00
[ [ "Pandharipande", "R.", "" ], [ "Zinger", "A.", "" ] ]
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802.1641
Martha Haynes P
Martha P. Haynes
ALFALFA: The Search for (Almost) Dark Galaxies and their Space Distribution
To appear in Il Nuovo Cimento, Proceedings of the Venice conference, "A Century of Cosmology: Past, Present and Future", August 27-31, 2007, 6 pages including 1 figure
null
null
MH-V07
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Arecibo Legacy Fast ALFA (ALFALFA) survey is designed to explore the z=0 HI mass function (HIMF) over a cosmologically significant volume. ALFALFA will improve on previous determinations of the HIMF by its combination of depth, wide area and centroiding accuracy, the latter allowing, in most cases, immediate identification of the optical counterpart to each HI signal. ALFALFA will detect hundreds of galaxies with HI masses less than 10**7.5 solar masses and also greater than 10**10.5 solar masses, and its final catalog will allow investigation of the dependence of the HIMF both on local density and on galaxy morphology. Already ALFALFA confirms previous suggestions that there is no cosmologically significant population of HI-rich dark galaxies. Fewer than 3% of all extragalactic HI sources and < 1% of ones with HI masses > 10**9.5 solar masses cannot be identified with a stellar counterpart. Very preliminary results on the presence of gas-rich dwarfs in the void in front of the Pisces-Perseus supercluster suggest an underabundance of such objects compared to the predictions of numerical simulations. The objects with highest HI mass exhibit a range of morphologies and optical colors and surface brightnesses but all appear to be massive disk systems. The latter represent the population likely to dominate future studies of HI at higher redshift with the Square Kilometer Array.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:33:52 GMT" } ]
2008-02-13T00:00:00
[ [ "Haynes", "Martha P.", "" ] ]
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802.1642
Bruno Chilian
Bruno Chilian, Klaus Fredenhagen
The time slice axiom in perturbative quantum field theory on globally hyperbolic spacetimes
14 pages, 1 figure, added reference for introduction, corrected typos, corrected a mistake in the proof in section 3
Commun.Math.Phys.287:513-522,2009
10.1007/s00220-008-0670-7
null
math-ph math.MP
null
The time slice axiom states that the observables which can be measured within an arbitrarily small time interval suffice to predict all other observables. While well known for free field theories where the validity of the time slice axiom is an immediate consequence of the field equation it was not known whether it also holds in generic interacting theories, the only exception being certain superrenormalizable models in 2 dimensions. In this paper we prove that the time slice axiom holds at least for scalar field theories within formal renormalized perturbation theory.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:51:48 GMT" }, { "version": "v2", "created": "Fri, 22 Feb 2008 12:46:10 GMT" }, { "version": "v3", "created": "Mon, 31 Mar 2008 17:18:53 GMT" } ]
2009-03-20T00:00:00
[ [ "Chilian", "Bruno", "" ], [ "Fredenhagen", "Klaus", "" ] ]
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802.1643
Yves Colin de Verdiere
Yves Colin de Verdi\`ere (IF)
A semi-classical inverse problem II: reconstruction of the potential
21 pages 5 Figures
null
null
null
math-ph math.AP math.MP math.SP
null
This paper is the continuation of our work with Victor Guillemin; Victor and I proved that the Taylor expansion of the potential at a generic non degenerate critical point is determined by the semi-classical spectrum of the associated Schr\"odinger operator near the corresponding critical value. Here, I show that, under some genericity assumptions, the potential of the 1D Schroedinger operator is determined by its semi-classical spectrum. Moreover, there is an explicit reconstruction. This paper is strongly related to a paper of David Gurarie (J. Math. Phys. 36:1934--1944 (1995)).
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:43:40 GMT" } ]
2008-02-13T00:00:00
[ [ "de Verdière", "Yves Colin", "", "IF" ] ]
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802.1644
Narges Abbasi
Narges Abbasi
On Limiting Distributions Of Estimation Of Central Moments
This paper has been withdrawn
null
null
IMS-EJS-EJS_2008_184
math.ST stat.TH
null
This paper has been withdrawn at the author's request.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:51:25 GMT" }, { "version": "v2", "created": "Tue, 19 Feb 2008 12:51:11 GMT" } ]
2008-02-19T00:00:00
[ [ "Abbasi", "Narges", "" ] ]
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802.1645
Bruno Angles
Bruno Angles (LMNO), Filippo A. E. Nuccio (LMNO)
On Jacobi Sums in $\mathbb Q(\zeta_p)$
null
null
null
null
math.NT
null
We study the p-adic behavior of Jacobi Sums for $\mathbb Q(\zeta_p)$ and link this study to the p-Sylow subgroup of the ideal class group of $\mathbb Q(\zeta_p\`a^+$
[ { "version": "v1", "created": "Tue, 12 Feb 2008 13:53:16 GMT" } ]
2020-04-10T00:00:00
[ [ "Angles", "Bruno", "", "LMNO" ], [ "Nuccio", "Filippo A. E.", "", "LMNO" ] ]
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802.1646
Charalampos Skokos
Charalampos Skokos, Tassos Bountis and Chris Antonopoulos
Detecting chaos, determining the dimensions of tori and predicting slow diffusion in Fermi--Pasta--Ulam lattices by the Generalized Alignment Index method
10 pages, 5 figures, submitted for publication in European Physical Journal - Special Topics. Revised version: Small explanatory additions to the text and addition of some references. A small figure change
null
10.1140/epjst/e2008-00844-2
null
nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The recently introduced GALI method is used for rapidly detecting chaos, determining the dimensionality of regular motion and predicting slow diffusion in multi--dimensional Hamiltonian systems. We propose an efficient computation of the GALI$_k$ indices, which represent volume elements of $k$ randomly chosen deviation vectors from a given orbit, based on the Singular Value Decomposition (SVD) algorithm. We obtain theoretically and verify numerically asymptotic estimates of GALIs long--time behavior in the case of regular orbits lying on low--dimensional tori. The GALI$_k$ indices are applied to rapidly detect chaotic oscillations, identify low--dimensional tori of Fermi--Pasta--Ulam (FPU) lattices at low energies and predict weak diffusion away from quasiperiodic motion, long before it is actually observed in the oscillations.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 14:15:49 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 20:57:41 GMT" }, { "version": "v3", "created": "Mon, 10 Mar 2008 17:04:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Skokos", "Charalampos", "" ], [ "Bountis", "Tassos", "" ], [ "Antonopoulos", "Chris", "" ] ]
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802.1647
Mauricio D. Garay
Mauricio D. Garay and Duco van Straten
Classical and quantum integrability
null
null
null
null
math-ph math.MP
null
We give a sufficient condition for quantising integrable systems.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:06:56 GMT" } ]
2008-02-13T00:00:00
[ [ "Garay", "Mauricio D.", "" ], [ "van Straten", "Duco", "" ] ]
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802.1648
Dung Di Caprio
M. Holovko, D. di Caprio
On the contact conditions for the charge profile in the theory of the electrical double layer for nonsymmetrical electrolytes
5 pages
null
10.1063/1.2909973
null
cond-mat.stat-mech cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The contact value of the charge profile for nonsymmetrical electrolytes is presented as the sum of three contributions. One of them is the normal component of the Maxwell electrostatic stress tensor. The second one is the surface electrostatic property defined as the integral of the product of the gradient of the electrical potential and the density distribution function of coions. The third term is the bulk contribution defined by the sum for anions and for cations of the product of their charge and their partial pressure. For noncharged surfaces only the last two are present and have the same sign in the case of size asymmetry. In the case of charge asymmetry the contact value of the charge profile is the result of the competitions of bulk and surface terms in which the bulk term is dominant. Using both the contact theorems for the density and the charge profiles, the exact expressions for the contact values of the profiles of coions and counterions are obtained and some related properties are discussed.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 14:35:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Holovko", "M.", "" ], [ "di Caprio", "D.", "" ] ]
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802.1649
Yuji Shirasaki
Yuji Shirasaki, Atsumasa Yoshida, Nobuyuki Kawai, Toru Tamagawa, Takanori Sakamoto, Motoko Suzuki, Yujin Nakagawam, Akina Kobayashi, Satoshi Sugita, Ichiro Takahashi, Makoto Arimoto, Takashi Shimokawabe, Nicolas Vasquez Pazmino, Takuto Ishimura, Rie Sato, Masaru Matsuoka, Edward E. Fenimore, Mark Galassi, Donald Q. Lamb, Carlo Graziani, Timothy Q. Donaghy, Jean-Luc Atteia, Alexandre Pelangeon, Roland Vanderspek, Geoffrey B. Crew, John P. Doty, Joel Villasenor, Gregory Prigozhin, Nat Butler, George R. Ricker, Kevin Hurley, Stanford E. Woosley, and Graziella Pizzichini
Multiple Component Analysis of Time Resolved Spectra of GRB041006: A Clue to the Nature of Underlying Soft Component of GRBs
19 pages, 10 figures, accepted for publication in PASJ, replaced with the accepted version (minor correction)
Publ.Astron.Soc.Jap.60:919,2008
10.1093/pasj/60.4.919
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
GRB 041006 was detected by HETE-2 at 12:18:08 UT on 06 October 2004. This GRB displays a soft X-ray emission, a precursor before the onset of the main event, and also a soft X-ray tail after the end of the main peak. The light curves in four different energy bands display different features; At higher energy bands several peaks are seen in the light curve, while at lower energy bands a single broader bump dominates. It is expected that these different features are the result of a mixture of several components each of which has different energetics and variability. To reveal the nature of each component, we analysed the time resolved spectra and they are successfully resolved into several components. We also found that these components can be classified into two distinct classes; One is a component which has an exponential decay of $E_{p}$ with a characteristic timescale shorter than $\sim$ 30 sec, and its spectrum is well represented by a broken power law function, which is frequently observed in many prompt GRB emissions, so it should have an internal-shock origin. Another is a component whose $E_{p}$ is almost unchanged with characteristic timescale longer than $\sim$ 60 sec, and shows a very soft emission and slower variability. The spectrum of the soft component is characterized by either a broken power law or a black body spectrum. This component might originate from a relatively wider and lower velocity jet or a photosphere of the fireball. By assuming that the soft component is a thermal emission, the radiation radius is initially $4.4 \times 10^{6}$ km, which is a typical radius of a blue supergiant, and its expansion velocity is $2.4 \times 10^{5}$ km/s in the source frame.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 14:39:01 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 15:18:53 GMT" } ]
2015-05-13T00:00:00
[ [ "Shirasaki", "Yuji", "" ], [ "Yoshida", "Atsumasa", "" ], [ "Kawai", "Nobuyuki", "" ], [ "Tamagawa", "Toru", "" ], [ "Sakamoto", "Takanori", "" ], [ "Suzuki", "Motoko", "" ], [ "Nakagawam", "Yujin", "" ], [ "Kobayashi", "Akina", "" ], [ "Sugita", "Satoshi", "" ], [ "Takahashi", "Ichiro", "" ], [ "Arimoto", "Makoto", "" ], [ "Shimokawabe", "Takashi", "" ], [ "Pazmino", "Nicolas Vasquez", "" ], [ "Ishimura", "Takuto", "" ], [ "Sato", "Rie", "" ], [ "Matsuoka", "Masaru", "" ], [ "Fenimore", "Edward E.", "" ], [ "Galassi", "Mark", "" ], [ "Lamb", "Donald Q.", "" ], [ "Graziani", "Carlo", "" ], [ "Donaghy", "Timothy Q.", "" ], [ "Atteia", "Jean-Luc", "" ], [ "Pelangeon", "Alexandre", "" ], [ "Vanderspek", "Roland", "" ], [ "Crew", "Geoffrey B.", "" ], [ "Doty", "John P.", "" ], [ "Villasenor", "Joel", "" ], [ "Prigozhin", "Gregory", "" ], [ "Butler", "Nat", "" ], [ "Ricker", "George R.", "" ], [ "Hurley", "Kevin", "" ], [ "Woosley", "Stanford E.", "" ], [ "Pizzichini", "Graziella", "" ] ]
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802.165
Roberto Aloisio
R. Aloisio, D. Boncioli, A. F. Grillo, C. Macolino, S. Petrera, P. Privitera, V. Rizi and F. Salamida
Detection of GRB signals with Fluorescence Detectors
16 pages 9 eps figures
Astropart.Phys.29:373-379,2008
10.1016/j.astropartphys.2008.04.002
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gamma Ray Bursts are being searched in many ground based experiments detecting the high energy component (GeV $\div$ TeV energy range) of the photon bursts. In this paper, Fluorescence Detectors are considered as possible candidate devices for these searches. It is shown that the GRB photons induce fluorescence emission of UV photons on a wide range of their spectrum. The induced fluorescence flux is dominated by GRB photons from 0.1 to about 100 MeV and, once the extinction through the atmosphere is taken into account, it is distributed over a wide angular region. This flux can be detected through a monitor of the diffuse photon flux, provided that its maximum value exceeds a threshold value, that is primarily determined by the sky brightness above the detector. The feasibility of this search and the expected rates are discussed on the basis of the current GRB observations and the existing fluorescence detectors.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:03:16 GMT" } ]
2013-06-11T00:00:00
[ [ "Aloisio", "R.", "" ], [ "Boncioli", "D.", "" ], [ "Grillo", "A. F.", "" ], [ "Macolino", "C.", "" ], [ "Petrera", "S.", "" ], [ "Privitera", "P.", "" ], [ "Rizi", "V.", "" ], [ "Salamida", "F.", "" ] ]
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802.1651
Roman Travkin
Roman Travkin
Mirabolic Robinson-Schensted-Knuth correspondence
28 pages. The list of conditions for the formulas for the action of generators on the mirabolic bimodule over the Hecke algebra corrected; the mirabolic RSK example modified; other minor changes. Document style reverted to amsart
Selecta Math. (N.S.) 14 (2009), no. 3-4, 727-758
null
null
math.AG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The set of orbits of $GL(V)$ in $Fl(V)\times Fl(V)\times V$ is finite, and is parametrized by the set of certain decorated permutations in a work of Solomon. We describe a Mirabolic RSK correspondence (bijective) between this set of decorated permutations and the set of triples: a pair of standard Young tableaux, and an extra partition. It gives rise to a partition of the set of orbits into combinatorial cells. We prove that the same partition is given by the type of a general conormal vector to an orbit. We conjecture that the same partition is given by the bimodule Kazhdan-Lusztig cells in the bimodule over the Iwahori-Hecke algebra of $GL(V)$ arising from $Fl(V)\times Fl(V)\times V$. We also give conjectural applications to the classification of unipotent mirabolic character sheaves on $GL(V)\times V$.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:51:19 GMT" }, { "version": "v2", "created": "Sun, 1 Feb 2009 15:21:31 GMT" }, { "version": "v3", "created": "Sun, 27 Mar 2011 04:40:30 GMT" }, { "version": "v4", "created": "Sat, 6 Nov 2021 18:41:54 GMT" } ]
2021-11-09T00:00:00
[ [ "Travkin", "Roman", "" ] ]
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802.1652
Michael Finkelberg
Michael Finkelberg, Victor Ginzburg, Roman Travkin
Mirabolic affine Grassmannian and character sheaves
22 pages. The final version to appear in Selecta Math
null
null
null
math.AG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We compute the Frobenius trace functions of mirabolic character sheaves defined over a finite field. The answer is given in terms of the character values of general linear groups over the finite field, and the structure constants of multiplication in the mirabolic Hall-Littlewood basis of symmetric functions, introduced by Shoji.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:40:11 GMT" }, { "version": "v2", "created": "Sun, 1 Feb 2009 15:17:30 GMT" } ]
2009-02-01T00:00:00
[ [ "Finkelberg", "Michael", "" ], [ "Ginzburg", "Victor", "" ], [ "Travkin", "Roman", "" ] ]
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802.1653
Panayotis Kevrekidis
D.E. Pelinovsky and P.G. Kevrekidis
Stability of discrete dark solitons in nonlinear Schrodinger lattices
11 pages, 5 figures
null
null
null
nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We obtain new results on the stability of discrete dark solitons bifurcating from the anti-continuum limit of the discrete nonlinear Schrodinger equation, following the analysis of our previous paper [Physica D 212, 1-19 (2005)]. We derive a criterion for stability or instability of dark solitons from the limiting configuration of the discrete dark soliton and confirm this criterion numerically. We also develop detailed calculations of the relevant eigenvalues for a number of prototypical configurations and obtain very good agreement of asymptotic predictions with the numerical data.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:32:45 GMT" } ]
2008-02-13T00:00:00
[ [ "Pelinovsky", "D. E.", "" ], [ "Kevrekidis", "P. G.", "" ] ]
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802.1654
B. Svaiter F.
Regina Sandra Burachik, B. F. Svaiter
Maximal monotonicity, conjugation and the duality product
8 pages, corrected author's names
Proceedings of the American Mathematical . Society 131 (2003), 2379-2383
10.1090/S0002-9939-03-07053-9
null
math.FA math.AP
null
Recently, the authors studied the connection between each maximal monotone operator T and a family H(T) of convex functions. Each member of this family characterizes the operator and satisfies two particular inequalities. The aim of this paper is to establish the converse of the latter fact. Namely, that every convex function satisfying those two particular inequalities is associated to a unique maximal monotone operator.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:36:37 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 11:51:06 GMT" } ]
2008-02-13T00:00:00
[ [ "Burachik", "Regina Sandra", "" ], [ "Svaiter", "B. F.", "" ] ]
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802.1655
Marko Vojinovic
Milovan Vasilic and Marko Vojinovic
Single-Pole Interaction of the Particle with the String
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 4:019,2008
10.3842/SIGMA.2008.019
null
gr-qc
http://creativecommons.org/licenses/by-nc-sa/3.0/
Within the framework of generalized Papapetrou method, we derive the effective equations of motion for a string with two particles attached to its ends, along with appropriate boundary conditions. The equations of motion are the usual Nambu-Goto-like equations, while boundary conditions turn out to be equations of motion for the particles at the string ends. Various properties of those equations are discussed, and a simple example is treated in detail, exhibiting the properties of Neumann and Dirichlet boundary conditions and giving a small correction term to the law of Regge trajectories due to the nonzero particle mass.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:38:27 GMT" } ]
2008-12-19T00:00:00
[ [ "Vasilic", "Milovan", "" ], [ "Vojinovic", "Marko", "" ] ]
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802.1656
St\'ephane Munier
S. Munier, F. Schwennsen (Ecole Polytechnique, CPHT)
Resummation of projectile-target multiple scatterings and parton saturation
14 pages, 16 figures
Phys.Rev.D78:034029,2008
10.1103/PhysRevD.78.034029
CPHT-RR-004-0208
hep-ph
null
In the framework of a toy model which possesses the main features of QCD in the high energy limit, we conduct a numerical study of scattering amplitudes constructed from parton splittings and projectile-target multiple interactions, in a way that unitarizes the amplitudes without however explicit saturation in the wavefunction of the incoming states. This calculation is performed in two different ways. One of these formulations, the closest to field theory, involves the numerical resummation of a factorially divergent series, for which we develop appropriate numerical tools. We accurately compare the properties of the resulting amplitudes with what would be expected if saturation were explicitly included in the evolution of the states. We observe that the amplitudes have similar properties in a small but finite range of rapidity in the beginning of the evolution, as expected. Some of the features of reaction-diffusion processes are already present in that range, even when saturation is left out of the model.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:44:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Munier", "S.", "", "Ecole Polytechnique, CPHT" ], [ "Schwennsen", "F.", "", "Ecole Polytechnique, CPHT" ] ]
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802.1657
Natalya A. Zimbovskaya
Natalya A. Zimbovskaya and Godfrey Gumbs
On the low frequency electromagnetic waves in quasi-two-dimensional metals
4 pages, 2 figures, accepted in Solid State Comm
Solid State Comm. 146, 88 (2008).
10.1016/j.ssc.2008.01.007
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Here, we theoretically analyze spectra of weakly attenuated electromagnetic waves which may appear in a Fermi-liquid of charge carriers in quasi-two-dimensional (Q2D) layered conductors when an external magnetic field is applied perpendicularly to the conducting layers. We study transverse modes propagating along the magnetic field. The frequencies of the modes are assumed to be lower than the cyclotron frequency of the charge carriers. It is shown that Fermi-liquid interaction of the charge carriers in Q2D conductors gives rise to a mode which cannot appear in a gase of charged quasiparticles, as well as it happens in conventional metals. Also, we show that the Fermi surface plofile may cause significant changes in the waves spectra and we analyze these changes.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:51:10 GMT" } ]
2008-10-23T00:00:00
[ [ "Zimbovskaya", "Natalya A.", "" ], [ "Gumbs", "Godfrey", "" ] ]
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802.1658
Subir Mukhopadhyay
Subir Mukhopadhyay and Koushik Ray
Branes in hearts with perverse sheaves
21 pages, LaTeX, references added, cosmetic changes
IndianJ.Phys.A80:1109-1122,2006
null
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Various topological properties of D-branes in the type--IIA theory are captured by the topologically twisted B-model, treating D-branes as objects in the bounded derived category of coherent sheaves on the compact part of the target space. The set of basic D-branes wrapped on the homology cycles of the compact space are taken to reside in the heart of t-structures of the derived category of coherent sheaves on the space at any point in the K\"ahler moduli space. The stability data entails specifying a t-structure along with a grade for sorting the branes. Considering an example of a degenerate Calabi-Yau space, obtained via geometric engineering, that retains but a projective curve as the sole non-compact part, we identify the regions in the K\"ahler moduli space of the curve that pertain to the different t-structures of the bounded derived category of coherent sheaves on the curve corresponding to the different phases of the topological branes.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:58:48 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 09:17:59 GMT" } ]
2008-11-26T00:00:00
[ [ "Mukhopadhyay", "Subir", "" ], [ "Ray", "Koushik", "" ] ]
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802.1659
Boris Pioline
Micha Berkooz (Weizmann) and Boris Pioline (LPTHE and LPTENS)
5D Black Holes and Non-linear Sigma Models
36 pages, 2 figures, uses JHEP3.cls; v3: change of convention in quaternionic vielbein, misprints corrected
JHEP0805:045,2008
10.1088/1126-6708/2008/05/045
LPTENS-08-11,WIS/05/08-FEB-DPP
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Stationary solutions of 5D supergravity with U(1) isometry can be efficiently studied by dimensional reduction to three dimensions, where they reduce to solutions to a locally supersymmetric non-linear sigma model. We generalize this procedure to 5D gauged supergravity, and identify the corresponding gauging in 3D. We pay particular attention to the case where the Killing spinor is non constant along the fibration, which results, even for ungauged supergravity in 5D, in an additional gauging in 3D, without introducing any extra potential. We further study SU(2)\times U(1) symmetric solutions, which correspond to geodesic motion on the sigma model (with potential in the gauged case). We identify and study the algebra of BPS constraints relevant for the Breckenridge-Myers-Peet-Vafa black hole, the Gutowski-Reall black hole and several other BPS solutions, and obtain the corresponding radial wave functions in the semi-classical approximation.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:01:55 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 17:06:16 GMT" }, { "version": "v3", "created": "Thu, 19 Feb 2009 13:29:57 GMT" } ]
2009-02-19T00:00:00
[ [ "Berkooz", "Micha", "", "Weizmann" ], [ "Pioline", "Boris", "", "LPTHE and LPTENS" ] ]
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802.166
James Lindesay
Beth A. Brown, James Lindesay
Radial Photon Trajectories Near an Evaporating Black Hole
4 figures
null
null
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The radial motion of photons emitted near the horizon of a black hole that evaporates at a steady rate is examined. The space-time of the black hole is generated using non-orthogonal coordinates. It is shown that some photons that are initially drawn towards the singularity can escape falling into the horizon. The behaviors of various outgoing and ingoing photons are clearly demonstrated through the use of a Penrose diagram.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:10:05 GMT" } ]
2008-02-13T00:00:00
[ [ "Brown", "Beth A.", "" ], [ "Lindesay", "James", "" ] ]
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802.1661
Marie-Annick Guillemer
Dima Grigoriev (IRMAR), Vladimir Shpilrain
Zero-knowledge authentication schemes from actions on graphs, groups, or rings
null
null
null
08-09
cs.CR
null
We propose a general way of constructing zero-knowledge authentication schemes from actions of a semigroup on a set, without exploiting any specific algebraic properties of the set acted upon. Then we give several concrete realizations of this general idea, and in particular, we describe several zero-knowledge authentication schemes where forgery (a.k.a. impersonation) is NP-hard. Computationally hard problems that can be employed in these realizations include (Sub)graph Isomorphism, Graph Colorability, Diophantine Problem, and many others.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:10:40 GMT" } ]
2008-02-13T00:00:00
[ [ "Grigoriev", "Dima", "", "IRMAR" ], [ "Shpilrain", "Vladimir", "" ] ]
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802.1662
Matthew Hummon
Matthew T. Hummon, Wesley C. Campbell, Hsin-I Lu, Edem Tsikata, Yihua Wang, John M. Doyle
Magnetic trapping of atomic nitrogen (14^N) and cotrapping of NH (X-triplet-Sigma-)
null
null
10.1103/PhysRevA.78.050702
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We observe magnetic trapping of atomic nitrogen (14^N) and cotrapping of ground state imidogen (14^NH, X-triplet-Sigma-). Both are loaded directly from a room temperature beam via buffer gas cooling. We trap approximately 1 * 10^11 14^N atoms at a peak density of 5 * 10^11 cm^-3 at 550 mK. The 12 +5/-3 s 1/e lifetime of atomic nitrogen in the trap is limited by elastic collisions with the helium buffer gas. Cotrapping of 14^N and 14^NH is accomplished, with 10^8 NH trapped molecules at a peak density of 10^8 cm^-3. We observe no spin relaxation of nitrogen in collisions with helium.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:25:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Hummon", "Matthew T.", "" ], [ "Campbell", "Wesley C.", "" ], [ "Lu", "Hsin-I", "" ], [ "Tsikata", "Edem", "" ], [ "Wang", "Yihua", "" ], [ "Doyle", "John M.", "" ] ]
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802.1663
Natalia Babkovskaia
N. Babkovskaia, A. Brandenburg and J. Poutanen
Boundary layer on the surface of a neutron star
7 pages, 7 figures
null
10.1111/j.1365-2966.2008.13099.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In an attempt to model the accretion onto a neutron star in low-mass X-ray binaries, we present two-dimensional hydrodynamical models of the gas flow in close vicinity of the stellar surface. First we consider a gas pressure dominated case, assuming that the star is non-rotating. For the stellar mass we take $M_{\rm star}=1.4 \times 10^{-2} \msun$ and for the gas temperature $T=5 \times 10^6$ K. Our results are qualitatively different in the case of a realistic neutron star mass and a realistic gas temperature of $T\simeq 10^8$ K, when the radiation pressure dominates. We show that to get the stationary solution in a latter case, the star most probably has to rotate with the considerable velocity.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:27:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Babkovskaia", "N.", "" ], [ "Brandenburg", "A.", "" ], [ "Poutanen", "J.", "" ] ]
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802.1664
Denis I. Golosov
D. I. Golosov, N. Ossi, A. Frydman, I. Felner, I. Nowik, M. I. Tsindlekht, and Y. M. Mukovskii
Two-Fluid Behaviour at the Origin of the Resistivity Peak in Doped Manganites
6 pages, including 3 figures; revised version; Europhys. Lett. (http://epljournal.edpsciences.org/), in press
Europhys. Lett. vol. 84, 47006 (2008).
10.1209/0295-5075/84/47006
null
cond-mat.str-el cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a series of magnetic and transport measurements on high-quality single crystal samples of colossal magnetoresistive manganites, La_{0.7} Ca_{0.3} Mn O_3 and Pr_{0.7} Sr_{0.3} Mn O_3. 1 % Fe doping allows a Moessbauer spectroscopy study, which shows (i) unusual line broadening within the ferromagnetic phase and (ii) a coexistence of ferro- and paramagnetic contributions in a region, T_1<T<T_2, around the Curie point T_C. In the case of Pr_{0.7} Sr_{0.3} Mn O_3, the resistivity peak occurs at a considerably higher temperature, T_{MI}>T_2. This shows that phase separation into metallic (ferromagnetic) and insulating (paramagnetic) phases cannot be generally responsible for the resistivity peak (and hence for the associated colossal magnetoresistance). Our results can be understood phenomenologically within the two-fluid approach, which also allows for a difference between T_C and T_{MI}. Our data indeed imply that while magnetic and transport properties of the manganites are closely interrelated, the two transitions at T_C and T_{MI} can be viewed as distinct phenomena.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 20:28:56 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 15:56:57 GMT" }, { "version": "v3", "created": "Tue, 4 Nov 2008 12:18:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Golosov", "D. I.", "" ], [ "Ossi", "N.", "" ], [ "Frydman", "A.", "" ], [ "Felner", "I.", "" ], [ "Nowik", "I.", "" ], [ "Tsindlekht", "M. I.", "" ], [ "Mukovskii", "Y. M.", "" ] ]
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802.1665
Fritz Gesztesy
Fritz Gesztesy, Yuri Latushkin, and Kevin Zumbrun
Derivatives of (Modified) Fredholm Determinants and Stability of Standing and Traveling Waves
47 pp, updated Theorem 2.3
J. Math. Pures Appl. 90, 160-200 (2008)
null
null
math.AP math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Continuing a line of investigation initiated in [11] exploring the connections between Jost and Evans functions and (modified) Fredholm determinants of Birman-Schwinger type integral operators, we here examine the stability index, or sign of the first nonvanishing derivative at frequency zero of the characteristic determinant, an object that has found considerable use in the study by Evans function techniques of stability of standing and traveling wave solutions of partial differential equations (PDE) in one dimension. This leads us to the derivation of general perturbation expansions for analytically-varying modified Fredholm determinants of abstract operators. Our main conclusion, similarly in the analysis of the determinant itself, is that the derivative of the characteristic Fredholm determinant may be efficiently computed from first principles for integral operators with semi-separable integral kernels, which include in particular the general one-dimensional case, and for sums thereof, which latter possibility appears to offer applications in the multi-dimensional case. A second main result is to show that the multi-dimensional characteristic Fredholm determinant is the renormalized limit of a sequence of Evans functions defined in [23] on successive Galerkin subspaces, giving a natural extension of the one-dimensional results of [11] and answering a question of [27] whether this sequence might possibly converge (in general, no, but with renormalization, yes). Convergence is useful in practice for numerical error control and acceleration.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:31:08 GMT" }, { "version": "v2", "created": "Wed, 30 Nov 2016 06:53:56 GMT" } ]
2016-12-01T00:00:00
[ [ "Gesztesy", "Fritz", "" ], [ "Latushkin", "Yuri", "" ], [ "Zumbrun", "Kevin", "" ] ]
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802.1666
Charles Dudley
C. C. Dudley, M. Imanishi and P. R. Maloney
Ice emission and the redshifts of submillimeter sources
37 pages, 8 figures, accepted for publication in the Astrophysical Journal
null
10.1086/587445
null
astro-ph
http://creativecommons.org/licenses/publicdomain/
Observations at submillimeter wavelengths have revealed a population of sources thought to be at relatively large redshifts. The position of the 850 $\mu$m passband on the Rayleigh-Jeans portion of the Planck function leads to a maximum redshift estimate of $z\sim$4.5 since sources will not retain their redshift independent brightness close to the peak of the Planck function and thus drop out of surveys. Here we review evidence that ice absorption is present in the spectra of local ultraluminous infrared galaxies which are often taken as analogs for the 850 $\mu$m source population. We consider the implication of this absorption for ice induced spectral structure at far infrared wavelengths and present marginal astronomical evidence that amorphous ice may have a feature similar to crystalline ice near 150 $\mu$m. Recent corroborative laboratory evidence is supportive of this conclusion. It is argued that early metal enrichment by pair instability SN may lead to a high ice content relative to refractory dust at high redshift and a fairly robust detection of ice emission in a $z=6.42$ quasar is presented. It is further shown that ice emission is needed to understand the 450 $\mu$m sources observed in the GOODS-N field. We are thus encouraged to apply far infrared ice emission models to the available observations of HDF 850.1, the brightest submillimeter source in the {\it Hubble Deep Field}. We suggest that a redshift as large as 13 may need to be considered for this source, nearly a factor of three above the usual top estimate. Inclusion of the possibility of far infrared ice emission in the spectral energy distributions of model sources generally broadens the range of redshifts to be considered for submillimeter sources compared to models without ice emission.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:34:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Dudley", "C. C.", "" ], [ "Imanishi", "M.", "" ], [ "Maloney", "P. R.", "" ] ]
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802.1667
Irene Giardina Dr
Michele Ballerini, Nicola Cabibbo, Raphael Candelier, Andrea Cavagna, Evaristo Cisbani, Irene Giardina, Alberto Orlandi, Giorgio Parisi, Andrea Procaccini, Massimiliano Viale, Vladimir Zdravkovic
An empirical study of large, naturally occurring starling flocks: a benchmark in collective animal behaviour
To be published in Animal Behaviour
null
null
null
q-bio.QM cond-mat.stat-mech q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bird flocking is a striking example of collective animal behaviour. A vivid illustration of this phenomenon is provided by the aerial display of vast flocks of starlings gathering at dusk over the roost and swirling with extraordinary spatial coherence. Both the evolutionary justification and the mechanistic laws of flocking are poorly understood, arguably because of a lack of data on large flocks. Here, we report a quantitative study of aerial display. We measured the individual three-dimensional positions in compact flocks of up to 2700 birds. We investigated the main features of the flock as a whole - shape, movement, density and structure - and discuss these as emergent attributes of the grouping phenomenon. We find that flocks are relatively thin, with variable sizes, but constant proportions. They tend to slide parallel to the ground and, during turns, their orientation changes with respect to the direction of motion. Individual birds keep a minimum distance from each other that is comparable to their wingspan. The density within the aggregations is non-homogeneous, as birds are packed more tightly at the border compared to the centre of the flock. These results constitute the first set of large-scale data on three-dimensional animal aggregations. Current models and theories of collective animal behaviour can now be tested against these results.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:13:14 GMT" } ]
2008-02-19T00:00:00
[ [ "Ballerini", "Michele", "" ], [ "Cabibbo", "Nicola", "" ], [ "Candelier", "Raphael", "" ], [ "Cavagna", "Andrea", "" ], [ "Cisbani", "Evaristo", "" ], [ "Giardina", "Irene", "" ], [ "Orlandi", "Alberto", "" ], [ "Parisi", "Giorgio", "" ], [ "Procaccini", "Andrea", "" ], [ "Viale", "Massimiliano", "" ], [ "Zdravkovic", "Vladimir", "" ] ]
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802.1668
Andrea Cavagna
Andrea Cavagna, Irene Giardina, Alberto Orlandi, Giorgio Parisi, Andrea Procaccini, Massimiliano Viale, Vladimir Zdravkovic
The STARFLAG handbook on collective animal behaviour: Part I, empirical methods
To be published in Animal Behaviour
Animal Behaviour 76 (1), 217-236 (2008)
null
null
q-bio.QM cond-mat.stat-mech q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The most startling examples of collective animal behaviour are provided by very large and cohesive groups moving in three dimensions. Paradigmatic examples are bird flocks, fish schools and insect swarms. However, because of the sheer technical difficulty of obtaining 3D data, empirical studies conducted to date have only considered loose groups of a few tens of animals. Moreover, these studies were very seldom conducted in the field. Recently the STARFLAG project achieved the 3D reconstruction of thousands of birds under field conditions, thus opening the way to a new generation of quantitative studies of collective animal behaviour. Here, we review the main technical problems in 3D data collection of large animal groups and we outline some of the methodological solutions adopted by the STARFLAG project. In particular, we explain how to solve the stereoscopic correspondence - or matching - problem, which was the major bottleneck of all 3D studies in the past.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 15:34:13 GMT" } ]
2014-10-10T00:00:00
[ [ "Cavagna", "Andrea", "" ], [ "Giardina", "Irene", "" ], [ "Orlandi", "Alberto", "" ], [ "Parisi", "Giorgio", "" ], [ "Procaccini", "Andrea", "" ], [ "Viale", "Massimiliano", "" ], [ "Zdravkovic", "Vladimir", "" ] ]
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802.1669
Nicholas Chia
Nicholas Chia and Junji Nakano
M-decomposability, elliptical unimodal densities, and applications to clustering and kernel density estimation
30 pages, 13 figures
null
null
null
stat.ME math.ST stat.ML stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Chia and Nakano (2009) introduced the concept of M-decomposability of probability densities in one-dimension. In this paper, we generalize M-decomposability to any dimension. We prove that all elliptical unimodal densities are M-undecomposable. We also derive an inequality to show that it is better to represent an M-decomposable density via a mixture of unimodal densities. Finally, we demonstrate the application of M-decomposability to clustering and kernel density estimation, using real and simulated data. Our results show that M-decomposability can be used as a non-parametric criterion to locate modes in probability densities.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:41:30 GMT" }, { "version": "v2", "created": "Wed, 21 Apr 2010 12:40:03 GMT" } ]
2010-04-22T00:00:00
[ [ "Chia", "Nicholas", "" ], [ "Nakano", "Junji", "" ] ]
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802.167
Henri Gouin
Sergey Gavrilyuk, Henri Gouin (MSNMGP, LMMT)
Symmetric form of governing equations for capillary fluids
6 pages
Monographs and Surveys in Pure and Applied Mathematics, France (1999)
null
null
math-ph math.MP physics.flu-dyn
null
In classical continuum mechanics, quasi-linear systems of conservation laws can be symmetrized if they admit an additional convex conservation law. In particular, this implies the hyperbolicity of governing equations. For capillary fluids, the internal energy depends not only on the density but also on its derivatives with respect to space variables. Consequently, the governing equations belong to the class of dispersive systems. In that case we propose a symmetric form of governing equations which is different from the classical Godunov -Friedrichs - Lax representation. This new symmetric form implies the stability of constant solutions.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:44:12 GMT" } ]
2009-04-14T00:00:00
[ [ "Gavrilyuk", "Sergey", "", "MSNMGP, LMMT" ], [ "Gouin", "Henri", "", "MSNMGP, LMMT" ] ]
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802.1671
Stefano Bellucci
Stefano Bellucci and Vadim Ohanyan
Two--center quantum MICZ--Kepler system and the Zeeman effect in the charge-dyon system
10 pages, no figures, LaTeX file
Phys.Lett.A372:5765-5772,2008
10.1016/j.physleta.2008.07.023
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The quantum two-center MICZ--Kepler system is considered in the limit when one of the interaction centers is situated at infinity, which leads to homogeneous electric and magnetic fields appearing in the system. The emerging system admits separation of variables in the Schr\"{o}dinger equation and is integrable at the classical level. The first order corrections to the unperturbed spectrum of the ordinary MICZ--Kepler system are calculated. Particularly, the linear Zeeman--effect and effects of MICZ-terms are analyzed. The possible realizations of the system in some quantum dots are considered.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:47:34 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 13:02:20 GMT" }, { "version": "v3", "created": "Thu, 10 Jul 2008 15:05:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Bellucci", "Stefano", "" ], [ "Ohanyan", "Vadim", "" ] ]
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802.1672
Cosmas Zachos
Christopher T. Hill and Cosmas K. Zachos
Chern-Simons and WZW Anomaly Cancelations Across Dimensions
6 pages, ReVtex 4, no figures
Annals Phys.323:3065-3073,2008
10.1016/j.aop.2008.08.009
FERMILAB-Pub-08-027-T, ANL-HEP-PR-08-8
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The WZW functional in D=4 can be derived directly from the Chern-Simons functional of a compactified D=5 gauge theory and the boundary fermions it supplants. A simple pedagogical model based on U(1) gauge groups illustrates how this works. A bulk-boundary system with the fermions eliminated manifestly evinces anomaly cancelations between CS and WZW terms.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 17:07:47 GMT" } ]
2009-09-17T00:00:00
[ [ "Hill", "Christopher T.", "" ], [ "Zachos", "Cosmas K.", "" ] ]
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802.1673
Zhenbo Qin
Wei-Ping Li, Zhenbo Qin
Equivariant cohomology of incidence Hilbert schemes and loop algebras
30 pages, 2 figures
null
null
null
math.AG math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $S$ be the affine plane $\C^2$ together with an appropriate $\mathbb T = \C^*$ action. Let $\hil{m,m+1}$ be the incidence Hilbert scheme. Parallel to \cite{LQ}, we construct an infinite dimensional Lie algebra that acts on the direct sum $$\Wft = \bigoplus_{m=0}^{+\infty}H^{2(m+1)}_{\mathbb T}(S^{[m,m+1]})$$ of the middle-degree equivariant cohomology group of $\hil{m,m+1}$. The algebra is related to the loop algebra of an infinite dimensional Heisenberg algebra. In addition, we study the transformations among three different linear bases of $\Wft$. Our results are applied to the ring structure of the ordinary cohomology of $\hil{m,m+1}$ and to the ring of symmetric functions in infinitely many variables.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 17:09:41 GMT" } ]
2008-02-13T00:00:00
[ [ "Li", "Wei-Ping", "" ], [ "Qin", "Zhenbo", "" ] ]
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802.1674
Andrea Cavagna
Andrea Cavagna, Irene Giardina, Alberto Orlandi, Giorgio Parisi, Andrea Procaccini
The STARFLAG handbook on collective animal behaviour: Part II, three-dimensional analysis
To be published in Animal Behaviour
Animal Behaviour 76 (1), 237-248 (2008)
null
null
q-bio.QM cond-mat.stat-mech q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The study of collective animal behaviour must progress through a comparison between the theoretical predictions of numerical models and data coming from empirical observations. To this aim it is important to develop methods of three-dimensional (3D) analysis that are at the same time informative about the structure of the group and suitable to empirical data. In fact, empirical data are considerably noisier than numerical data, and they are subject to several constraints. We review here the tools of analysis used by the STARFLAG project to characterise the 3D structure of large flocks of starlings in the field. We show how to avoid the most common pitfalls i the quantitative analysis of 3D animal groups, with particular attention to the problem of the bias introduced by the border of the group. By means of practical examples, we demonstrate that neglecting border effects gives rise to artefacts when studying the 3D structure of a group. Moreover, we show that mathematical rigour is essential to distinguish important biological properties from trivial geometric features of animal groups.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 16:38:46 GMT" } ]
2014-10-10T00:00:00
[ [ "Cavagna", "Andrea", "" ], [ "Giardina", "Irene", "" ], [ "Orlandi", "Alberto", "" ], [ "Parisi", "Giorgio", "" ], [ "Procaccini", "Andrea", "" ] ]
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802.1675
Raphael Hirschi
R. Hirschi (1), C. Chiappini (2,3), G. Meynet (2), A. Maeder (2), and S. Ekstrom (2), (1 Keele University, UK; 2 Geneva Observatory, CH; 3 Trieste Observatory)
Stellar Evolution at Low Metallicity
12 pages, 7 figures, "Massive Stars as Cosmic Engines" Conference proceedings (IAU Symp 250), F. Bresolin, P.A. Crowther, J. Puls Eds
null
10.1017/S1743921308020528
null
astro-ph
null
Massive stars played a key role in the early evolution of the Universe. They formed with the first halos and started the re-ionisation. It is therefore very important to understand their evolution. In this review, we first recall the effect of metallicity (Z) on the evolution of massive stars. We then describe the strong impact of rotation induced mixing and mass loss at very low Z. The strong mixing leads to a significant production of primary nitrogen 14, carbon 13 and neon 22. Mass loss during the red supergiant stage allows the production of Wolf-Rayet stars, type Ib,c supernovae and possibly gamma-ray bursts (GRBs) down to almost Z=0 for stars more massive than 60 solar masses. Galactic chemical evolution models calculated with models of rotating stars better reproduce the early evolution of N/O, C/O and C12/C13. Finally, the impact of magnetic fields is discussed in the context of GRBs.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 17:42:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Hirschi", "R.", "" ], [ "Chiappini", "C.", "" ], [ "Meynet", "G.", "" ], [ "Maeder", "A.", "" ], [ "Ekstrom", "S.", "" ] ]
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802.1676
Jeremy O'Brien
Alex S. Clark, Jeremie Fulconis, John G. Rarity, William J. Wadsworth, Jeremy L. O'Brien
An All Optical Fibre Quantum Controlled-NOT Gate
4 pages, 4 figures, comments welcome
Phys. Rev. A 79, 030303(R) (2009)
10.1103/PhysRevA.79.030303
null
quant-ph
null
We report the first experimental demonstration of an optical controlled-NOT gate constructed entirely in fibre. We operate the gate using two heralded optical fibre single photon sources and find an average logical fidelity of 90% and an average process fidelity of 0.83<F<0.91. On the basis of a simple model we are able to conclude that imperfections are primarily due to the photon sources, meaning that the gate itself works with very high fidelity.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 17:57:13 GMT" } ]
2015-05-13T00:00:00
[ [ "Clark", "Alex S.", "" ], [ "Fulconis", "Jeremie", "" ], [ "Rarity", "John G.", "" ], [ "Wadsworth", "William J.", "" ], [ "O'Brien", "Jeremy L.", "" ] ]
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802.1677
Chandana Sinha
S. Roy snd C. Sinha
Formation of negative hydrogen ion in Positronium - Hydrogen collisions
16 pages, 10 figures
null
null
null
physics.atom-ph
http://creativecommons.org/licenses/by/3.0/
The importance of the excited states of Positronium (Ps) in the formation cross sections(both differential and total) of the negative hydrogen ion (H^-) are investigated theoretically for the charge transfer reaction, Ps (n = 1, 2) + H --> e+ + H^- for a wide range of incident energies (e. g., threshold - 500 eV) . The calculations are performed in the frame work of a qualitative model, the post collisional Coulomb Modified Eikonal Approximation (CMEA) . A comparative study is also made between the capture from ground and excited states of the Ps. The present CMEA model takes account of higher order effects which is essential for a rearrangement process where the First Born type Approximation (Coulomb Born for the ionic case) is not supposed to be adequate. At low incident energies, the excited states of Ps (2s, 2p) are found to play a dominant role in the H^- formation cross sections . Significant deviations are noted between the present CMEA and the Coulomb Born (CBA) results even at very high incident energies (e.g., Ei = 500 eV), indicating the importance of higher order effects. At high incident energies the present CMEA differential cross section (DCS) exhibits a double peak structure which is totally absent in the CBA and could again be attributed to higher order effects.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 17:33:35 GMT" } ]
2008-02-13T00:00:00
[ [ "Sinha", "S. Roy snd C.", "" ] ]
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802.1678
Valery Kubarovsky
V. Kubarovsky, P. Stoler and I. Bedlinsky (for the CLAS Collaboration)
Deeply Virtual Pseudoscalar Meson Production with CLAS
Prepared for XII Workshop on High Energy Spin Physics DSPIN-07, Dubna, September 3-7, 2007
null
10.1142/9789812796950_0020
JLAB-PHY-08-776
hep-ex
null
Deeply virtual meson scattering cross sections and asymmetries for the pi^0 and eta exclusive electroproduction in a very wide kinematic range of Q^2, t and x_B have been measured with CLAS (JLab). Initial analysis is already showing remarkable results. These data will help us to better understand the transition from soft to hard mechanisms.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:38:04 GMT" } ]
2019-08-13T00:00:00
[ [ "Kubarovsky", "V.", "", "for the CLAS Collaboration" ], [ "Stoler", "P.", "", "for the CLAS Collaboration" ], [ "Bedlinsky", "I.", "", "for the CLAS Collaboration" ] ]
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802.1679
Feng Yuan
Feng Yuan (SHAO), Renyi Ma (SHAO), and Ramesh Narayan (CfA)
A simplified global solution for an advection-dominated accretion flow
12 pages, 4 figures, accepted by ApJ
null
10.1086/587484
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When we model black hole accretion sources such as active galactic nuclei and black hole X-ray binaries as advection-dominated accretion flows (ADAFs), it is neccesary to use the global solution to the equations rather than the simpler self-similar solution, since the latter is inaccurate in the region near the black hole where most of the radiation is emitted. However, technically, it is a difficult task to calculate the global solution because of the transonic nature of the flow, which makes it a two-point boundary value problem. In this paper we propose a simplified approach for calculating the global ADAF solution. We replace the radial momentum equation by a simple algebraic relation between the angular velocity of the gas and the Keplerian angular velocity, while keeping all other equations unchanged. It is then easy to solve the differential energy equations to obtain an approximate global solution. By adjusting the free parameters, we find that for almost any accretion rate and for $\alpha=0.1-0.3$ we can get good simplified global solutions. The predicted spectra from the approximate solutions are very close to the spectra obtained from the true global solutions.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:01:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Yuan", "Feng", "", "SHAO" ], [ "Ma", "Renyi", "", "SHAO" ], [ "Narayan", "Ramesh", "", "CfA" ] ]
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802.168
Christian Angrick
Christian Angrick and Matthias Bartelmann
Statistics of gravitational potential perturbations: A novel approach to deriving the X-ray temperature function
10 pages, 5 figures, accepted for publication in A&A. Revision to match the published version. Equation 8 corrected. Notable changes in section 4 including new figures
Astron.Astrophys. 494:461-470,2009
10.1051/0004-6361:200809562
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Context. While the halo mass function is theoretically a very sensitive measure of cosmological models, masses of dark-matter halos are poorly defined, global, and unobservable quantities. Aims. We argue that local, observable quantities such as the X-ray temperatures of galaxy clusters can be directly compared to theoretical predictions without invoking masses. We derive the X-ray temperature function directly from the statistics of Gaussian random fluctuations in the gravitational potential. Methods. We derive the abundance of potential minima constrained by the requirement that they belong to linearly collapsed structures. We then use the spherical-collapse model to relate linear to non-linear perturbations, and the virial theorem to convert potential depths to temperatures. No reference is made to mass or other global quantities in the derivation. Results. Applying a proper high-pass filter that removes large enough modes from the gravitational potential, we derive an X-ray temperature function that agrees very well with the classical Press-Schechter approach on relevant temperature scales, but avoids the necessity of measuring masses. Conclusions. TThis first study shows that and how an X-ray temperature function of galaxy clusters can be analytically derived, avoiding the introduction of poorly defined global quantities such as halo masses. This approach will be useful for reducing scatter in observed cluster distributions and thus in cosmological conclusions drawn from them.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:05:30 GMT" }, { "version": "v2", "created": "Wed, 29 Oct 2008 16:53:04 GMT" }, { "version": "v3", "created": "Mon, 26 Jan 2009 10:36:04 GMT" } ]
2014-11-18T00:00:00
[ [ "Angrick", "Christian", "" ], [ "Bartelmann", "Matthias", "" ] ]
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802.1681
Lek-Heng Lim
Pierre Comon (University of Nice at Sophia-Antipolis), Gene Golub (Stanford University), Lek-Heng Lim (Stanford University), Bernard Mourrain (INRIA at Sophia-Antipolis)
Symmetric tensors and symmetric tensor rank
To appear in the SIAM Journal on Matrix Analysis and Applications
null
null
SCCM Technical Report 06-02
math.NA math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A symmetric tensor is a higher order generalization of a symmetric matrix. In this paper, we study various properties of symmetric tensors in relation to a decomposition into a sum of symmetric outer product of vectors. A rank-1 order-k tensor is the outer product of k non-zero vectors. Any symmetric tensor can be decomposed into a linear combination of rank-1 tensors, each of them being symmetric or not. The rank of a symmetric tensor is the minimal number of rank-1 tensors that is necessary to reconstruct it. The symmetric rank is obtained when the constituting rank-1 tensors are imposed to be themselves symmetric. It is shown that rank and symmetric rank are equal in a number of cases, and that they always exist in an algebraically closed field. We will discuss the notion of the generic symmetric rank, which, due to the work of Alexander and Hirschowitz, is now known for any values of dimension and order. We will also show that the set of symmetric tensors of symmetric rank at most r is not closed, unless r = 1.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:17:44 GMT" }, { "version": "v2", "created": "Tue, 2 Sep 2008 19:16:47 GMT" } ]
2008-09-02T00:00:00
[ [ "Comon", "Pierre", "", "University of Nice at Sophia-Antipolis" ], [ "Golub", "Gene", "", "Stanford University" ], [ "Lim", "Lek-Heng", "", "Stanford University" ], [ "Mourrain", "Bernard", "", "INRIA at Sophia-Antipolis" ] ]
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802.1682
Matteo G. A. Paris
Roberto Gaiba, Matteo G A Paris
Squeezed vacuum as a universal quantum probe
revised version, 2 figures
Phys. Lett. A 373, 934 (2009)
10.1016/j.physleta.2009.01.026
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address local quantum estimation of bilinear Hamiltonians probed by Gaussian states. We evaluate the relevant quantum Fisher information (QFI) and derive the ultimate bound on precision. Upon maximizing the QFI we found that single- and two-mode squeezed vacuum represent an optimal and universal class of probe states, achieving the so-called Heisenberg limit to precision in terms of the overall energy of the probe. We explicitly obtain the optimal observable based on the symmetric logarithmic derivative and also found that homodyne detection assisted by Bayesian analysis may achieve estimation of squeezing with near-optimal sensitivity in any working regime. Besides, by comparison of our results with those coming from global optimization of the measurement we found that Gaussian states are effective resources, which allow to achieve the ultimate bound on precision imposed by quantum mechanics using measurement schemes feasible with current technology.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:18:19 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 16:00:03 GMT" }, { "version": "v3", "created": "Sun, 28 Sep 2008 14:27:12 GMT" } ]
2009-11-13T00:00:00
[ [ "Gaiba", "Roberto", "" ], [ "Paris", "Matteo G A", "" ] ]
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802.1683
Andrzej Drzewinski
Andrzej Drzewinski, J.M.J. van Leeuwen
Crossover from Reptation to Rouse dynamics in the Extended Rubinstein-Duke Model
16 Pages RevTeX and 13 PostScript figures included, accepted for publication in Phys. Rev. E
null
10.1103/PhysRevE.77.031802
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The competition between reptation and Rouse Dynamics is incorporated in the Rubinstein-Duke model for polymer motion by extending it with sideways motions, which cross barriers and create or annihilate hernias. Using the Density-Matrix Renormalization-Group Method as solver of the Master Equation, the renewal time and the diffusion coefficient are calculated as function of the length of the chain and the strength of the sideways motion. These new types of moves have a strong and delicate influence on the asymptotic behavior of long polymers. The effects are analyzed as function of the chain length in terms of effective exponents and crossover scaling functions.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:20:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Drzewinski", "Andrzej", "" ], [ "van Leeuwen", "J. M. J.", "" ] ]
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802.1684
Alice Myerson
A. Myerson, D. Szwer, S. Webster, D. Allcock, M. Curtis, G. Imreh, J. Sherman, D. Stacey, A. Steane and D. Lucas
High-fidelity readout of trapped-ion qubits
4 pages, 3 figures; improved readout fidelity (numerical results changed)
Phys. Rev. Lett. 100, 200502 (2008)
10.1103/PhysRevLett.100.200502
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate single-shot qubit readout with fidelity sufficient for fault-tolerant quantum computation, for two types of qubit stored in single trapped calcium ions. For an optical qubit stored in the (4S_1/2, 3D_5/2) levels of 40Ca+ we achieve 99.991(1)% average readout fidelity in one million trials, using time-resolved photon counting. An adaptive measurement technique allows 99.99% fidelity to be reached in 145us average detection time. For a hyperfine qubit stored in the long-lived 4S_1/2 (F=3, F=4) sub-levels of 43Ca+ we propose and implement a simple and robust optical pumping scheme to transfer the hyperfine qubit to the optical qubit, capable of a theoretical fidelity 99.95% in 10us. Experimentally we achieve 99.77(3)% net readout fidelity, inferring at least 99.87(4)% fidelity for the transfer operation.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:30:15 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 13:30:17 GMT" } ]
2013-12-24T00:00:00
[ [ "Myerson", "A.", "" ], [ "Szwer", "D.", "" ], [ "Webster", "S.", "" ], [ "Allcock", "D.", "" ], [ "Curtis", "M.", "" ], [ "Imreh", "G.", "" ], [ "Sherman", "J.", "" ], [ "Stacey", "D.", "" ], [ "Steane", "A.", "" ], [ "Lucas", "D.", "" ] ]
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802.1685
Christoph Durr
Marcin Bienkowski, Marek Chrobak, Christoph Durr, Mathilde Hurand, Artur Jez, Lukasz Jez, Jakub Lopuszanski, Grzegorz Stachowiak
Generalized Whac-a-Mole
null
null
null
null
cs.DS
null
We consider online competitive algorithms for the problem of collecting weighted items from a dynamic set S, when items are added to or deleted from S over time. The objective is to maximize the total weight of collected items. We study the general version, as well as variants with various restrictions, including the following: the uniform case, when all items have the same weight, the decremental sets, when all items are present at the beginning and only deletion operations are allowed, and dynamic queues, where the dynamic set is ordered and only its prefixes can be deleted (with no restriction on insertions). The dynamic queue case is a generalization of bounded-delay packet scheduling (also referred to as buffer management). We present several upper and lower bounds on the competitive ratio for these variants.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:41:46 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 00:09:51 GMT" } ]
2016-09-08T00:00:00
[ [ "Bienkowski", "Marcin", "" ], [ "Chrobak", "Marek", "" ], [ "Durr", "Christoph", "" ], [ "Hurand", "Mathilde", "" ], [ "Jez", "Artur", "" ], [ "Jez", "Lukasz", "" ], [ "Lopuszanski", "Jakub", "" ], [ "Stachowiak", "Grzegorz", "" ] ]
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802.1686
M\'arcio Jos\'e Menon
Geovanna L.P. Silva, Marcio J. Menon, Regina F. Avila
Proton Profile Function at 52.8 GeV
Published in Int. J. Mod. Phys. E
Int.J.Mod.Phys.E16:2923-2926,2007
10.1142/S0218301307008732
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the results of a novel model-independent fit to elastic proton-proton differential cross section data at $\sqrt s$ = 52.8 GeV. Taking into account the error propagation from the fit parameters, we determine the scattering amplitude in the impact parameter space (the proton profile function) and its statistical uncertainty region. We show that both the real and imaginary parts of the profile are consistent with two dynamical contributions, one from a central dense region, up to roughly 1 fm and another from a peripheral evanescent region from 1 to 3 fm.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 18:44:19 GMT" } ]
2011-03-28T00:00:00
[ [ "Silva", "Geovanna L. P.", "" ], [ "Menon", "Marcio J.", "" ], [ "Avila", "Regina F.", "" ] ]
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802.1687
Kenichi Yoshida
Kenichi Yoshida, Nguyen Van Giai
Low-lying dipole resonance in neutron-rich Ne isotopes
8 pages, 9 figures and 5 tables
Phys.Rev.C78:014305,2008
10.1103/PhysRevC.78.014305
null
nucl-th
null
Microscopic structure of the low-lying isovector dipole excitation mode in neutron-rich $^{26,28,30}$Ne is investigated by performing deformed quasiparticle-random-phase-approximation (QRPA) calculations. The particle-hole residual interaction is derived from a Skyrme force through a Landau-Migdal approximation. We have obtained the low-lying resonance in $^{26}$Ne at around 8.5 MeV. It is found that the isovector dipole strength at $E_{x}<10$ MeV exhausts about 6.0% of the classical Thomas-Reiche-Kuhn dipole sum rule. This excitation mode is composed of several QRPA eigenmodes, one is generated by a $\nu(2s^{-1}_{1/2} 2p_{3/2})$ transition dominantly, and the other mostly by a $\nu(2s^{-1}_{1/2} 2p_{1/2})$ transition. The neutron excitations take place outside of the nuclear surface reflecting the spatially extended structure of the $2s_{1/2}$ wave function. In $^{30}$Ne, the deformation splitting of the giant resonance is large, and the low-lying resonance is overlapping with the giant resonance.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 20:29:56 GMT" } ]
2008-11-26T00:00:00
[ [ "Yoshida", "Kenichi", "" ], [ "Van Giai", "Nguyen", "" ] ]
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802.1688
Fabien Bretenaker
F. Goldfarb, J. Ghosh, M. David, J. Ruggiero, T. Chaneli\`ere, J.-L. Le Gou\"et, H. Gilles, R. Ghosh, and F. Bretenaker
Observation of Ultra-narrow Electromagnetically Induced Transparency and Slow Light using Purely Electronic Spins in a Hot Atomic Vapor
null
Europhys. Lett. 82, 54002 (2008)
10.1209/0295-5075/82/54002
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Electromagnetically induced transparency (EIT) is observed in gaseous 4He at room temperature. Ultra-narrow (less than 10 kHz) EIT windows are obtained for the first time for purely electronic spins in the presence of Doppler broadening. The positive role of collisions is emphasized through measurements of the power dependence of the EIT resonance. Measurement of slow light opens up possible ways to applications.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:02:27 GMT" }, { "version": "v2", "created": "Mon, 17 Mar 2008 14:01:08 GMT" } ]
2008-05-19T00:00:00
[ [ "Goldfarb", "F.", "" ], [ "Ghosh", "J.", "" ], [ "David", "M.", "" ], [ "Ruggiero", "J.", "" ], [ "Chanelière", "T.", "" ], [ "Gouët", "J. -L. Le", "" ], [ "Gilles", "H.", "" ], [ "Ghosh", "R.", "" ], [ "Bretenaker", "F.", "" ] ]
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802.1689
Leonard S. Kisslinger
Leonard S Kisslinger (Department of Physics, Carnegie Mellon University) Sandip Pakvasa (Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu)
SN1987A Pulsar Velocity From Modified URCA Processes and Landau Levels
2 pages, no figures
null
null
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a recent estimate of the velocity of pulsars arising from neutrinos emitted with modified URCA processes with electrons in Landua levels, and the temperture of the protoneutron star created by SN1987A, derived from the energy of the observed neutrinos, we predict the velocity of the resulting pulsar.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:03:11 GMT" } ]
2008-02-13T00:00:00
[ [ "Kisslinger", "Leonard S", "", "Department of Physics, Carnegie Mellon\n University" ], [ "Pakvasa", "Sandip", "", "Department of Physics and Astronomy, University\n of Hawaii at Manoa, Honolulu" ] ]
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802.169
Andrzej Kwasniewski
A. Krzysztof Kwasniewski
More on the Bernoulli and Taylor Formula for Extended Umbral Calculus
11 pages
Advances in Applied Clifford Algebras Volume 16, Number 1,(2006) 29-39
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One delivers here the extended Bernoulli and Taylor formula of a new sort with the rest term of the Cauchy type recently derived by the author in the case of the so called $\psi$-difference calculus which constitutes the representative for the purpose case of extended umbral calculus. The central importance of such a type formulas is beyond any doubt. Recent publications do confirm this historically established experience. Its links via umbrality to combinatorics are known at least since Rota and Mullin source papers then up to recently extended by many authors to be indicated in the sequel.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:24:00 GMT" } ]
2008-02-15T00:00:00
[ [ "Kwasniewski", "A. Krzysztof", "" ] ]
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802.1691
Omar Maj
Omar Maj
Complex geometric optics for symmetric hyperbolic systems I: linear theory
null
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We obtain an asymptotic solution for $\ep \to 0$ of the Cauchy problem for linear first-order symmetric hyperbolic systems with oscillatory initial values written in the eikonal form of geometric optics with frequency $1/\ep$, but with complex phases. For the most common linear wave propagation models, this kind on Cauchy problems are well-known in the applied literature and their asymptotic theory, referred to as complex geometric optics, is attracting interest for applications. In this work, which is the first of a series of papers dedicated to complex geometric optics for nonlinear symmetric hyperbolic systems, we develop a rigorous linear theory and set the basis for the subsequent nonlinear analysis.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:35:53 GMT" } ]
2008-02-13T00:00:00
[ [ "Maj", "Omar", "" ] ]
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802.1692
Gail Schaefer
G. H. Schaefer, M. Simon, L. Prato, and T. Barman
Preliminary Orbit of the Young Binary Haro 1-14c
28 pages, 9 figures, accepted for publication in AJ
null
10.1088/0004-6256/135/5/1659
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the Keck Interferometer, we spatially resolved the orbit of the pre-main sequence binary, Haro 1-14c, for the first time. We present these interferometric observations along with additional spectroscopic radial velocity measurements of the components. We performed a simultaneous orbit fit to the interferometric visibilities and the radial velocities of Haro 1-14c. Based on a statistical analysis of the possible orbital solutions that fit the data, we determined component masses of M_1 = 0.96 (+0.27/-0.08) Msun and M_2 = 0.33 (+0.09/-0.02) Msun for the primary and secondary, respectively, and a distance to the system of 111 (+19/-18) pc. The distance measurement is consistent with the close distance estimates of the Ophiuchus molecular cloud. Comparing our results with evolutionary tracks suggests an age of 3-4 Myr for Haro 1-14c. With additional interferometric measurements to improve the uncertainties in the masses and distance, we expect the low-mass secondary to provide important empirical data for calibrating the theoretical evolutionary tracks for pre-main sequence stars.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:37:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Schaefer", "G. H.", "" ], [ "Simon", "M.", "" ], [ "Prato", "L.", "" ], [ "Barman", "T.", "" ] ]
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802.1693
Marco Picariello
F. Bazzocchi, S. Morisi, M. Picariello, E. Torrente-Lujan
Embedding A4 into SU(3)xU(1) flavor symmetry: Large neutrino mixing and fermion mass hierarchy in SO(10) GUT
11 pages, uses package "axodraw", "graphicx"
J.Phys.G36:015002,2009
10.1088/0954-3899/36/1/015002
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a common explanation of the fermion mass hierarchy and the large lepton mixing angles in the context of a grand unified flavor and gauge theory (GUTF). Our starting point is a SU(3)xU(1) flavor symmetry and a SO(10) GUT, a basic ingredient of our theory which plays a major role is that two different breaking pattern of the flavor symmetry are at work. On one side, the dynamical breaking of SU(3)xU(1) flavor symmetry into U(2)xZ_3 explains why one family is much heavier than the others. On the other side, an explicit symmetry breaking of SU(3) into a discrete flavor symmetry leads to the observed tribimaximal mixing for the leptons. We write an explicit model where this discrete symmetry group is A4. Naturalness of the charged fermion mass hierarchy appears as a consequence of the continuous SU(3) flavor symmetry. Moreover, the same discrete A4-GUT invariant operators are the root of the large lepton mixing, small Cabibbo angle, and neutrino masses.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:42:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Bazzocchi", "F.", "" ], [ "Morisi", "S.", "" ], [ "Picariello", "M.", "" ], [ "Torrente-Lujan", "E.", "" ] ]
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802.1694
Paola Rebusco Dr
Bruno Coppi
Thermo-Rotational Instability in Plasma Disks Around Compact Objects
null
Europhys.Lett.82:19001,2008
10.1209/0295-5075/82/19001
null
astro-ph
null
Differentially rotating plasma disks, around compact objects, that are imbedded in a ``seed'' magnetic field are shown to develop vertically localized ballooning modes that are driven by the combined radial gradient of the rotation frequency and vertical gradients of the plasma density and temperature. When the electron mean free path is shorter than the disk height and the relevant thermal conductivity can be neglected, the vertical particle flows produced by of these modes have the effect to drive the density and temperature profiles toward the ``adiabatic condition'' where $\eta_{T}\equiv(dlnT/dz)/(dlnn/dz)=2/3$. Here $T$ is the plasma temperature and $n$ the particle density. The faster growth rates correspond to steeper temperature profiles $(\eta_{T}>2/3)$ such as those produced by an internal (e.g., viscous) heating process. In the end, ballooning modes excited for various values of $\eta_{T}$ can lead to the evolution of the disk into a different current carrying configuration such as a sequence of plasma rings.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:49:30 GMT" } ]
2009-06-23T00:00:00
[ [ "Coppi", "Bruno", "" ] ]
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802.1695
Vasundhara Chetluru
B.Alver, et al (for the PHOBOS collaboration)
Identified charged antiparticle to particle ratios near midrapidity in Cu+Cu collisions at sqrt(s) = 62.4 and 200 GeV
5 Pages, 4 figures Made changes to the figures to include the panel numbers. Slight changes to the text. Updated data points from other experiments
Phys.Rev.C77:061901,2008
10.1103/PhysRevC.77.061901
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Antiparticle to particle ratios for identified protons, kaons and pions at sqrt(s) = 62.4 and 200 GeV in Cu+Cu collisions are presented as a function of centrality for the midrapidity region of 0.2 < eta < 1.4. No strong dependence on centrality is observed. For the <pbar>/<p> ratio at <p_T> ~ 0.51 GeV/c, we observe an average value of 0.50 +/- 0.003_(stat) +/- 0.04_(syst) and 0.77 +/- 0.008_(stat) +/- 0.05_(syst) for the 10% most central collisions of 62.4 and 200 GeV Cu+Cu, respectively. The values for all three particle species measured at sqrt(s) = 200 GeV are in agreement within systematic uncertainties with that seen in both heavier and lighter systems measured at the same RHIC energy. This indicates that system size does not appear to play a strong role in determining the midrapidity chemical freeze-out properties affecting the antiparticle to particle ratios of the three most abundant particle species produced in these collisions.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:47:00 GMT" }, { "version": "v2", "created": "Thu, 1 May 2008 14:57:35 GMT" } ]
2019-08-13T00:00:00
[ [ "Alver", "B.", "" ] ]
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802.1696
Andrzej Kwasniewski
A. Krzysztof Kwa\'sniewski
First Observations on Prefab Posets Whitney Numbers
14 pages
Advances in Applied Clifford Algebras Volume 18, Number 1 / February, 2008, 57-73
10.1007/s00006-007-0054-7
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a natural partial order in structurally natural finite subsets of the cobweb prefabs sets recently constructed by the present author. Whitney numbers of the second kind of the corresponding subposet which constitute Stirling like numbers triangular array are then calculated and the explicit formula for them is provided. Next, in the second construction we endow the set sums of prefabiants with such an another partial order that their Bell like numbers include Fibonacci triad sequences introduced recently by the present author in order to extend famous relation between binomial Newton coefficients and Fibonacci numbers onto the infinity of their relatives among whom there are also the Fibonacci triad sequences and binomial like coefficients (incidence coefficients included). The first partial order is F sequence independent while the second partial order is F sequence dependent where F is the so called admissible sequence determining cobweb poset by construction. An F determined cobweb posets Hasse diagram becomes Fibonacci tree sheathed with specific cobweb if the sequence F is chosen to be just the Fibonacci sequence. From the stand-point of linear algebra of formal series these are generating functions which stay for the so called extended coherent states of quantum physics. This information is delivered in the last section.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:47:18 GMT" } ]
2008-02-15T00:00:00
[ [ "Kwaśniewski", "A. Krzysztof", "" ] ]
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802.1697
Omar Maj
Omar Maj
Complex geometric optics for symmetric hyperbolic systems II: nonlinear theory in one space dimension
null
null
null
null
math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is the second part of a work aimed to study complex-phase oscillatory solutions of nonlinear symmetric hyperbolic systems. We consider, in particular, the case of one space dimension. That is a remarkable case, since one can always satisfy the \emph{naive} coherence condition on the complex phases, which is required in the construction of the approximate solution. Formally the theory applies also in several space dimensions, but the \emph{naive} coherence condition appears to be too restrictive; the identification of the optimal coherence condition is still an open problem.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:47:55 GMT" } ]
2008-02-13T00:00:00
[ [ "Maj", "Omar", "" ] ]
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802.1698
Constantino Tsallis
Constantino Tsallis, Angel R. Plastino and Ramon F. Alvarez-Estrada
Escort mean values and the characterization of power-law-decaying probability densities
20 pages (2 Appendices have been added)
null
10.1063/1.3104063
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Escort mean values (or $q$-moments) constitute useful theoretical tools for describing basic features of some probability densities such as those which asymptotically decay like {\it power laws}. They naturally appear in the study of many complex dynamical systems, particularly those obeying nonextensive statistical mechanics, a current generalization of the Boltzmann-Gibbs theory. They recover standard mean values (or moments) for $q=1$. Here we discuss the characterization of a (non-negative) probability density by a suitable set of all its escort mean values together with the set of all associated normalizing quantities, provided that all of them converge. This opens the door to a natural extension of the well known characterization, for the $q=1$ instance, of a distribution in terms of the standard moments, provided that {\it all} of them have {\it finite} values. This question would be specially relevant in connection with probability densities having {\it divergent} values for all nonvanishing standard moments higher than a given one (e.g., probability densities asymptotically decaying as power-laws), for which the standard approach is not applicable. The Cauchy-Lorentz distribution, whose second and higher even order moments diverge, constitutes a simple illustration of the interest of this investigation. In this context, we also address some mathematical subtleties with the aim of clarifying some aspects of an interesting non-linear generalization of the Fourier Transform, namely, the so-called $q$-Fourier Transform.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 19:55:23 GMT" }, { "version": "v2", "created": "Sat, 18 Oct 2008 14:06:33 GMT" } ]
2015-05-13T00:00:00
[ [ "Tsallis", "Constantino", "" ], [ "Plastino", "Angel R.", "" ], [ "Alvarez-Estrada", "Ramon F.", "" ] ]
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802.1699
Prajakta Nimbhorkar
Nutan Limaye, Meena Mahajan, Prajakta Nimbhorkar
Longest paths in Planar DAGs in Unambiguous Logspace
null
null
null
null
cs.CC
http://creativecommons.org/licenses/by-nc-sa/3.0/
We show via two different algorithms that finding the length of the longest path in planar directed acyclic graph (DAG) is in unambiguous logspace UL, and also in the complement class co-UL. The result extends to toroidal DAGs as well.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 20:08:39 GMT" } ]
2008-02-13T00:00:00
[ [ "Limaye", "Nutan", "" ], [ "Mahajan", "Meena", "" ], [ "Nimbhorkar", "Prajakta", "" ] ]
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802.17
Jes\'us San Mart\'in
M. Dolores Sotelo Herrera and Jesus San Martin
An Analytical Study in Coupled Map Lattices of Synchronized States and Travelling Waves, and of their Period-Doubling Cascades
35 pages and 6 figures
null
null
null
nlin.PS nlin.CD
null
Several theorems are demonstrated that determine the sufficient conditions for the existence of synchronized states (periodical and chaotic) and also of travelling waves in a CML. Also are analytically proven the existence of period-doubling cascades for the mentioned patterns. The temporal state of any oscillators are completely characterized. The given results are valid for a number of arbitrary oscillators whose individual dynamics is ruled by an arbitrary C^{2} function.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 20:10:30 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 18:09:33 GMT" } ]
2008-02-14T00:00:00
[ [ "Herrera", "M. Dolores Sotelo", "" ], [ "Martin", "Jesus San", "" ] ]
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802.1701
Igor E. Mazets
I.E. Mazets, T. Schumm, J. Schmiedmayer
Breakdown of integrability in a quasi-one-dimensional ultracold bosonic gas
4 pages, 3 figures, revtex4
Phys. Rev. Lett. 100, 210403 (2008)
10.1103/PhysRevLett.100.210403
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate that virtual excitations of higher radial modes in an atomic Bose gas in a tightly confining waveguide result in effective three-body collisions that violate integrability in this quasi-one-dimensional quantum system and give rise to thermalization. The estimated thermalization rates are consistent with recent experimental results in quasi-1D dynamics of ultracold atoms.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 20:20:10 GMT" } ]
2008-06-14T00:00:00
[ [ "Mazets", "I. E.", "" ], [ "Schumm", "T.", "" ], [ "Schmiedmayer", "J.", "" ] ]
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802.1702
Sidney Redner
Sanjib Sabhapandit, Satya N. Majumdar, S. Redner
Crowding at the Front of the Marathon Packs
5 pages, 2 figures; version 2: published manuscript with various changes in response to referee comments and some additional improvements
J. Stat. Mech. (2008) L03001
10.1088/1742-5468/2008/03/L03001
null
physics.data-an physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the crowding of near-extreme events in the time gaps between successive finishers in major international marathons. Naively, one might expect these gaps to become progressively larger for better-placing finishers. While such an increase does indeed occur from the middle of the finishing pack down to approximately 20th place, the gaps saturate for the first 10-20 finishers. We give a probabilistic account of this feature. However, the data suggests that the gaps have a weak maximum around the 10th place, a feature that seems to have a sociological origin.
[ { "version": "v1", "created": "Tue, 12 Feb 2008 20:22:09 GMT" }, { "version": "v2", "created": "Tue, 22 Apr 2008 23:37:28 GMT" } ]
2008-04-23T00:00:00
[ [ "Sabhapandit", "Sanjib", "" ], [ "Majumdar", "Satya N.", "" ], [ "Redner", "S.", "" ] ]
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