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712.3579
Diana Worrall
D.M. Worrall, M. Birkinshaw, R.P. Kraft, G.R. Sivakoff, A. Jordan, M.J. Hardcastle, N.J. Brassington, J.H. Croston, D.A. Evans, W.R. Forman, W.E. Harris, C. Jones, A.M. Juett, S.S. Murray, P.E.J. Nulsen, S. Raychaudhury, C.L. Sarazin, K.A. Woodley
Where Centaurus A gets its X-ray knottiness
Accepted for publication in ApJ (Letters)
null
10.1086/528681
null
astro-ph
null
We report an X-ray spectral study of the transverse structure of the Centaurus A jet using new data from the Chandra Cen A Very Large Project. We find that the spectrum steepens with increasing distance from the jet axis, and that this steepening can be attributed to a change in the average spectrum of the knotty emission. Such a trend is unexpected if the knots are predominantly a surface feature residing in a shear layer between faster and slower flows. We suggest that the spectral steepening of the knot emission as a function of distance from the jet axis is due to knot migration, implying a component of transverse motion of knots within the flow.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 21:20:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Worrall", "D. M.", "" ], [ "Birkinshaw", "M.", "" ], [ "Kraft", "R. P.", "" ], [ "Sivakoff", "G. R.", "" ], [ "Jordan", "A.", "" ], [ "Hardcastle", "M. J.", "" ], [ "Brassington", "N. J.", "" ], [ "Croston", "J. H.", "" ], [ "Evans", "D. A.", "" ], [ "Forman", "W. R.", "" ], [ "Harris", "W. E.", "" ], [ "Jones", "C.", "" ], [ "Juett", "A. M.", "" ], [ "Murray", "S. S.", "" ], [ "Nulsen", "P. E. J.", "" ], [ "Raychaudhury", "S.", "" ], [ "Sarazin", "C. L.", "" ], [ "Woodley", "K. A.", "" ] ]
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712.358
David Kalaj
David Kalaj
A priori estimate of gradient of a solution to certain differential inequality and quasiconformal mappings
24 pages
null
null
null
math.AP math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We will prove a global estimate for the gradient of the solution to the {\it Poisson differential inequality} $|\Delta u(x)|\le a|\nabla u(x)|^2+b$, $x\in B^{n}$, where $a,b<\infty$ and $u|_{S^{n-1}}\in C^{1,\alpha}(S^{n-1}, \Bbb R^m)$. If $m=1$ and $a\le (n+1)/(|u|_\infty4n\sqrt n)$, then $|\nabla u| $ is a priori bounded. This generalizes some similar results due to E. Heinz (\cite{EH}) and Bernstein (\cite{BS}) for the plane. An application of these results yields the theorem, which is the main result of the paper: A quasiconformal mapping of the unit ball onto a domain with $C^2$ smooth boundary, satisfying the Poisson differential inequality, is Lipschitz continuous. This extends some results of the author, Mateljevi\'c and Pavlovi\'c from the complex plane to the space.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 08:42:39 GMT" }, { "version": "v2", "created": "Mon, 6 Oct 2008 20:01:52 GMT" }, { "version": "v3", "created": "Sun, 13 Dec 2009 09:40:42 GMT" } ]
2009-12-14T00:00:00
[ [ "Kalaj", "David", "" ] ]
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712.3581
Andrew Houck
J. A. Schreier, A. A. Houck, Jens Koch, D. I. Schuster, B. R. Johnson, J. M. Chow, J. M. Gambetta, J. Majer, L. Frunzio, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf
Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
4+ pages, 4 figures
Phys. Rev. B 77, 180502(R) (2008)
10.1103/PhysRevB.77.180502
null
cond-mat.mes-hall cond-mat.supr-con quant-ph
null
We present an experimental realization of the transmon qubit, an improved superconducting charge qubit derived from the Cooper pair box. We experimentally verify the predicted exponential suppression of sensitivity to 1/f charge noise [J. Koch et al., Phys. Rev. A 76, 042319 (2007)]. This removes the leading source of dephasing in charge qubits, resulting in homogenously broadened transitions with relaxation and dephasing times in the microsecond range. Our systematic characterization of the qubit spectrum, anharmonicity, and charge dispersion shows excellent agreement with theory, rendering the transmon a promising qubit for future steps towards solid-state quantum information processing.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 21:59:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Schreier", "J. A.", "" ], [ "Houck", "A. A.", "" ], [ "Koch", "Jens", "" ], [ "Schuster", "D. I.", "" ], [ "Johnson", "B. R.", "" ], [ "Chow", "J. M.", "" ], [ "Gambetta", "J. M.", "" ], [ "Majer", "J.", "" ], [ "Frunzio", "L.", "" ], [ "Devoret", "M. H.", "" ], [ "Girvin", "S. M.", "" ], [ "Schoelkopf", "R. J.", "" ] ]
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712.3582
Nicola Brassington
N. J. Brassington (Harvard-Smithsonian Center for Astrophysics)
The LMXB Population of NGC 3379
Conference proceedings from 'A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments', 28 Oct - 2 Nov, St. Petersburg Beach, FL, 3 pages, 3 figures
null
null
null
astro-ph
null
Presented here are the highlights from the deep Chandra observation of the elliptical galaxy NGC 3379. From the multi-epoch observation of this galaxy, 132 discrete X-ray sources have been detected within the region overlapped by all observations, 98 of which lie within the D25 ellipse of the galaxy. Of these 132 sources, 71 exhibit long-term variability, indicating that they are accreting compact objects. 11 of these sources have been identified as transient candidates, with a further 7 possible transients. In addition to this, from the joint Hubble/Chandra field of view, nine globular clusters (GCs) and 53 field low mass X-ray binaries (LMXBs) have been detected in the galaxy. Comparisons of these two populations reveals that, at higher luminosities the field LMXBs and GC-LMXBs are similar. However, a significant lack of GC-LMXBs has been found at lower luminosities, indicating that not all LMXBs can form in GCs.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 21:40:29 GMT" } ]
2007-12-24T00:00:00
[ [ "Brassington", "N. J.", "", "Harvard-Smithsonian Center for Astrophysics" ] ]
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712.3583
Peter Lunkenheimer
F. Schrettle, S. Krohns, P. Lunkenheimer, J. Hemberger, N. B\"uttgen, H.-A. Krug von Nidda, A. V. Prokofiev, and A. Loidl
Switching the Ferroelectric Polarization by External Magnetic Fields in the Spin = 1/2 Chain Cuprate LiCuVO4
6 pages, 5 figures
Phys. Rev. B 77, 144101 (2008)
10.1103/PhysRevB.77.144101
null
cond-mat.str-el
null
We present a detailed study of complex dielectric constant and ferroelectric polarization in multiferroic LiCuVO4 as function of temperature and external magnetic field. In zero external magnetic field, spiral spin order with an ab helix and a propagation vector along the crystallographic b direction is established, which induces ferroelectric order with spontaneous polarization parallel to a. The direction of the helix can be reoriented by an external magnetic field and allows switching of the spontaneous polarization. We find a strong dependence of the absolute value of the polarization for different orientations of the spiral plane. Above 7.5 T, LiCuVO4 reveals collinear spin order and remains paraelectric for all field directions. Thus this system is ideally suited to check the symmetry relations for spiral magnets as predicted theoretically. The strong coupling of ferroelectric and magnetic order is documented and the complex (B,T) phase diagram is fully explored.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 21:37:29 GMT" } ]
2008-04-15T00:00:00
[ [ "Schrettle", "F.", "" ], [ "Krohns", "S.", "" ], [ "Lunkenheimer", "P.", "" ], [ "Hemberger", "J.", "" ], [ "Büttgen", "N.", "" ], [ "von Nidda", "H. -A. Krug", "" ], [ "Prokofiev", "A. V.", "" ], [ "Loidl", "A.", "" ] ]
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712.3584
Jan de Gier
Jan de Gier, Pavel Pyatov and Paul Zinn-Justin
Punctured plane partitions and the q-deformed Knizhnik--Zamolodchikov and Hirota equations
27 pages, 29 eps figures, section rewritten and reference added
J. Combin. Theory A 116 (2009), 772--794
10.1016/j.jcta.2008.11.008
null
math.CO math-ph math.MP math.RT
null
We consider partial sum rules for the homogeneous limit of the solution of the q-deformed Knizhnik--Zamolodchikov equation with reflecting boundaries in the Dyck path representation. We show that these partial sums arise in a solution of the discrete Hirota equation, and prove that they are the generating functions of $\tau^2$-weighted punctured cyclically symmetric transpose complement plane partitions where $\tau=-(q+q^{-1})$. In the cases of no or minimal punctures, we prove that these generating functions coincide with $\tau^2$-enumerations of vertically symmetric alternating sign matrices and modifications thereof.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 03:49:58 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 09:26:32 GMT" } ]
2010-07-06T00:00:00
[ [ "de Gier", "Jan", "" ], [ "Pyatov", "Pavel", "" ], [ "Zinn-Justin", "Paul", "" ] ]
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712.3585
Eran O. Ofek
E. O. Ofek, M. Muno, R. Quimby, S. R. Kulkarni, H. Stiele, W. Pietsch, E. Nakar, A. Gal-Yam, A. Rau, P. B. Cameron, S. B. Cenko, M. M. Kasliwal, D. B. Fox, P. Chandra, A. K. H. Kong, R. Barnard
GRB 070201: A possible Soft Gamma Ray Repeater in M31
7 pages, submitted to ApJ (Fig. 2 resolution reduced)
Astrophys.J.681:1464-1469,2008
10.1086/587686
null
astro-ph
null
The gamma-ray burst (GRB) 070201 was a bright short-duration hard-spectrum GRB detected by the Inter-Planetary Network (IPN). Its error quadrilateral, which has an area of 0.124 sq. deg, intersects some prominent spiral arms of the nearby M31 (Andromeda) galaxy. Given the properties of this GRB, along with the fact that LIGO data argues against a compact binary merger origin in M31, this GRB is an excellent candidate for an extragalactic Soft Gamma-ray Repeater (SGR) giant flare, with energy of 1.4x10^45 erg. Analysis of ROTSE-IIIb visible light observations of M31, taken 10.6 hours after the burst and covering 42% of the GRB error region, did not reveal any optical transient down to a limiting magnitude of 17.1. We inspected archival and proprietary XMM-Newton X-ray observations of the intersection of the GRB error quadrilateral and M31, obtained about four weeks prior to the outburst, in order to look for periodic variable X-ray sources. No SGR or Anomalous X-ray Pulsar (AXP) candidates (periods in range 1 to 20 s) were detected. We discuss the possibility of detecting extragalactic SGRs/AXPs by identifying their periodic X-ray light curves. Our simulations suggest that the probability of detecting the periodic X-ray signal of one of the known Galactic SGRs/AXPs, if placed in M31, is about 10% (50%), using 50 ks (2 Ms) XMM-Newton exposures.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 21:50:40 GMT" } ]
2011-05-18T00:00:00
[ [ "Ofek", "E. O.", "" ], [ "Muno", "M.", "" ], [ "Quimby", "R.", "" ], [ "Kulkarni", "S. R.", "" ], [ "Stiele", "H.", "" ], [ "Pietsch", "W.", "" ], [ "Nakar", "E.", "" ], [ "Gal-Yam", "A.", "" ], [ "Rau", "A.", "" ], [ "Cameron", "P. B.", "" ], [ "Cenko", "S. B.", "" ], [ "Kasliwal", "M. M.", "" ], [ "Fox", "D. B.", "" ], [ "Chandra", "P.", "" ], [ "Kong", "A. K. H.", "" ], [ "Barnard", "R.", "" ] ]
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712.3586
Timo Aspelmeier
T. Aspelmeier
Free energy fluctuations and chaos in the Sherrington-Kirkpatrick model
4.5 pages, no figures. This manuscript supersedes arXiv:cond-mat/0610228
Phys. Rev. Lett. 100:117205, 2008
10.1103/PhysRevLett.100.117205
null
cond-mat.dis-nn
null
The sample-to-sample fluctuations Delta F_N of the free energy in the Sherrington-Kirkpatrick model are shown rigorously to be related to bond chaos. Via this connection, the fluctuations become analytically accessible by replica methods. The replica calculation for bond chaos shows that the exponent mu governing the growth of the fluctuations with system size N, i.e. Delta F_N N^mu, is bounded by mu <= 1/4.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:39:37 GMT" } ]
2008-03-25T00:00:00
[ [ "Aspelmeier", "T.", "" ] ]
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712.3587
Po-Hsiang Lai
Po-Hsiang Lai and Joseph A. O'Sullivan
Pattern Recognition System Design with Linear Encoding for Discrete Patterns
Submitted and accepted to ISIT 2007
null
null
null
cs.IT cs.CV math.IT
null
In this paper, designs and analyses of compressive recognition systems are discussed, and also a method of establishing a dual connection between designs of good communication codes and designs of recognition systems is presented. Pattern recognition systems based on compressed patterns and compressed sensor measurements can be designed using low-density matrices. We examine truncation encoding where a subset of the patterns and measurements are stored perfectly while the rest is discarded. We also examine the use of LDPC parity check matrices for compressing measurements and patterns. We show how more general ensembles of good linear codes can be used as the basis for pattern recognition system design, yielding system design strategies for more general noise models.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 22:46:29 GMT" } ]
2007-12-24T00:00:00
[ [ "Lai", "Po-Hsiang", "" ], [ "O'Sullivan", "Joseph A.", "" ] ]
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712.3588
V\'ictor Rivero
Andreas E. Kyprianou and V\'i ctor Rivero
Special, conjugate and complete scale functions for spectrally negative L\'evy processes
null
null
null
null
math.PR
null
Following from recent developments by Hubalek and Kyprianou, the objective of this paper is to provide further methods for constructing new families of scale functions for spectrally negative L\'evy processes which are completely explicit. This is the result of an observation in the aforementioned paper which permits feeding the theory of Bernstein functions directly into the Wiener-Hopf factorization for spectrally negative L\'evy processes. Many new, concrete examples of scale functions are offered although the methodology in principle delivers still more explicit examples than those listed.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 22:35:48 GMT" } ]
2007-12-24T00:00:00
[ [ "Kyprianou", "Andreas E.", "" ], [ "Rivero", "Ví ctor", "" ] ]
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712.3589
Mikhail Volkov
Julien Garaud and Mikhail S. Volkov
Stability Analysis of The Twisted Superconducting Semilocal Strings
33 pages, 6 figures. to appear in Nuclear Physics B
Nucl.Phys.B799:430-455,2008
10.1016/j.nuclphysb.2008.01.022
null
hep-th cond-mat.supr-con hep-ph
null
We study the stability properties of the twisted vortex solutions in the semilocal Abelian Higgs model with a global $\mathbf{SU}(2)$ invariance. This model can be viewed as the Weinberg-Salam theory in the limit where the non-Abelian gauge field decouples, or as a two component Ginzburg-Landau theory. The twisted vortices are characterized by a constant global current ${\cal I}$, and for ${\cal I}\to 0$ they reduce to the semilocal strings, that is to the Abrikosov-Nielsen-Olesen vortices embedded into the semilocal model. Solutions with ${\cal I}\neq 0$ are more complex and, in particular, they are {\it less energetic} than the semilocal strings, which makes one hope that they could have better stability properties. We consider the generic field fluctuations around the twisted vortex within the linear perturbation theory and apply the Jacobi criterion to test the existence of the negative modes in the spectrum of the fluctuation operator. We find that twisted vortices do not have the homogeneous instability known for the semilocal strings, neither do they have inhomogeneous instabilities whose wavelength is less than a certain critical value. This implies that short enough vortex pieces are perturbatively stable and suggests that small vortex loops could perhaps be stable as well. For longer wavelength perturbations there is exactly one negative mode in the spectrum whose growth entails a segmentation of the uniform vortex into a non-uniform, `sausage like' structure. This instability is qualitatively similar to the hydrodynamical Plateau-Rayleigh instability of a water jet or to the Gregory-Laflamme instability of black strings in the theory of gravity in higher dimensions.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 22:55:35 GMT" }, { "version": "v2", "created": "Sun, 23 Dec 2007 21:39:36 GMT" }, { "version": "v3", "created": "Thu, 24 Jan 2008 22:15:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Garaud", "Julien", "" ], [ "Volkov", "Mikhail S.", "" ] ]
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712.359
Tomasz Rusin dr
Tomasz M. Rusin and Wlodek Zawadzki
Zitterbewegung of electrons in graphene in a magnetic field
9 pages, 8 figures
Phys. Rev. B 78, 125419 (2008)
10.1103/PhysRevB.78.125419
null
cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Electric current and spacial displacement due to trembling motion [Zitterbewegung (ZB)] of electrons in graphene in the presence of an external magnetic field are described. Contributions of both inequivalent $K$ points in the Brillouin zone of graphene are considered. It is shown that, when the electrons are prepared in the form of wave packets, the presence of a quantizing magnetic field $B$ has very important effects on ZB. (1) For $B\neq 0$ the ZB oscillations are permanent, for B=0 they are transient. (2) For $B\neq 0$ many ZB frequencies appear, for B=0 only one frequency is at work. (3) For $B\neq 0$ both interband and intraband (cyclotron) frequencies contribute to ZB, for B=0 there are no intraband frequencies. (4) Magnetic field intensity changes not only the ZB frequencies but the entire character of ZB spectrum. An emission of electromagnetic dipole radiation by the trembling electrons is proposed and described. It is argued that graphene in a magnetic field is a promising system for an experimental observation of Zitterbewegung.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 06:52:08 GMT" }, { "version": "v2", "created": "Mon, 7 Jul 2008 19:27:50 GMT" } ]
2010-03-30T00:00:00
[ [ "Rusin", "Tomasz M.", "" ], [ "Zawadzki", "Wlodek", "" ] ]
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712.3591
Michael Schindler
M. Schindler and A. Ajdari
Droplet traffic in microfluidic networks: A simple model for understanding and designing
accepted for publication in PRL
Phys. Rev. Lett. 100, 044501 (2008)
10.1103/PhysRevLett.100.044501
null
physics.flu-dyn math.DS nlin.CD
null
We propose a simple model to analyze the traffic of droplets in microfluidic ``dual networks''. Such functional networks which consist of two types of channels, namely those accessible or forbidden to droplets, often display a complex behavior characteristic of dynamical systems. By focusing on three recently proposed configurations, we offer an explanation for their remarkable behavior. Additionally, the model allows us to predict the behavior in different parameter regimes. A verification will clarify fundamental issues, such as the network symmetry, the role of the driving conditions, and of the occurrence of reversible behavior. The model lends itself to a fast numerical implementation, thus can help designing devices, identifying parameter windows where the behavior is sufficiently robust for a devices to be practically useful, and exploring new functionalities.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 22:50:01 GMT" } ]
2008-01-30T00:00:00
[ [ "Schindler", "M.", "" ], [ "Ajdari", "A.", "" ] ]
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712.3592
Friederike Schmid
Jens Smiatek, Michael P. Allen, Friederike Schmid
Tunable-slip boundaries for coarse-grained simulations of fluid flow
submitted to Eur. Phys. J. E (accepted)
null
10.1140/epje/i2007-10311-4
null
physics.comp-ph physics.flu-dyn
null
On the micro- and nanoscale, classical hydrodynamic boundary conditions such as the no-slip condition no longer apply. Instead, the flow profiles exhibit ``slip`` at the surface, which is characterized by a finite slip length (partial slip). We present a new, systematic way of implementing partial-slip boundary conditions with arbitrary slip length in coarse-grained computer simulations. The main idea is to represent the complex microscopic interface structure by a spatially varying effective viscous force. An analytical equation for the resulting slip length can be derived for planar and for curved surfaces. The comparison with computer simulations of a DPD (dissipative particle dynamics) fluid shows that this expression is valid from full-slip to no-slip.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 22:55:31 GMT" }, { "version": "v2", "created": "Thu, 20 Mar 2008 10:29:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Smiatek", "Jens", "" ], [ "Allen", "Michael P.", "" ], [ "Schmid", "Friederike", "" ] ]
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712.3593
Ferran Mazzanti
F.Mazzanti, G.E.Astrakharchik, J.Boronat, J.Casulleras
Off-diagonal Ground State Properties of a 1D Gas of Fermi Hard Rods
5 figures
null
10.1103/PhysRevA.77.043632
null
cond-mat.stat-mech
null
A variational Monte Carlo calculation of the one-body density matrix and momentum distribution of a system of Fermi hard rods (HR) is presented and compared with the same quantities for its bosonic counterpart. The calculation is exact within statistical errors since we sample the exact ground state wave function, whose analytical expression is known. The numerical results are in good agreement with known asymptotic expansions valid for Luttinger liquids. We find that the difference between the absolute value of the bosonic and fermionic density matrices becomes marginally small as the density increases. In this same regime, the corresponding momentum distributions merge into a common profile that is independent of the statistics. Non-analytical contributions to the one--body density matrix are also discussed and found to be less relevant with increasing density.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 14:17:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Mazzanti", "F.", "" ], [ "Astrakharchik", "G. E.", "" ], [ "Boronat", "J.", "" ], [ "Casulleras", "J.", "" ] ]
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712.3594
Xi Chen
Xi Chen, Edward L. Wright (UCLA)
Extragalactic Point Source Search in WMAP 61 and 94 GHz Data
22 pages, 10 figures, submitted to ApJ; Typo corrected in the uncertainty of kappa in the Discussion, and a correction to the description of the smoothing function in Methodology
null
10.1086/588249
null
astro-ph
null
We report the results of an extragalactic point source search using the 61 and 94 GHz (V- and W-band) temperature maps from the Wilkinson Microwave Anisotropy Probe (WMAP). Applying a method that cancels the ``noise'' due to the CMB anisotropy signal, we find in the $|b| > 10\degr$ region 31 sources in the first-year maps and 64 sources in the three-year co-added maps, at a $5\sigma$ level. The 1$\sigma$ position uncertainties are 1.6' and 1.4' each. The increased detections and improved positional accuracy are expected from the higher signal-to-noise ratio of WMAP three-year data. All sources detected in the first-year maps are repeatedly detected in the three-year maps, which is a strong proof of the consistency and reliability of this method. Among all the detections, 21 are new, i.e. not in the WMAP three-year point source catalog. We associate all but two of them with known objects. The two unidentified sources are likely to be variable or extended as observations through VLA, CARMA and ATCA all show non-detection at the nominal locations. We derive the source count distribution at WMAP V-band by combining our verified detections with sources from the WMAP three-year catalog. Assuming the effect of source clustering is negligible, the contribution to the power spectrum from faint sources below 0.75 Jy is estimated to be $(2.4\pm0.8) \times 10^{-3} \mu K^2$ sr for V-band, which implies a source correction amplitude $A = 0.012\pm0.004 \mu K^2$ sr.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 23:16:16 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 00:16:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Chen", "Xi", "", "UCLA" ], [ "Wright", "Edward L.", "", "UCLA" ] ]
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712.3595
Kuang-Ta Chao
Ce Meng, Kuang-Ta Chao
Scalar Resonance Contributions to the Dipion Transition Rates of $\Upsilon(4S,5S)$ in the re-scattering model
version to appear in Phys. Rev. D, discussions and references added
Phys.Rev.D77:074003,2008
10.1103/PhysRevD.77.074003
null
hep-ph hep-ex
null
In order to explain the observed unusually large dipion transition rates of $\Upsilon(10870)$, the scalar resonance contributions in the re-scattering model to the dipion transitions of $\Upsilon(4S)$ and $\Upsilon(5S)$ are studied. Since the imaginary part of the re-scattering amplitude is expected to be dominant, the large ratios of the transition rates of $\Upsilon(10870)$, which is identified with $\Upsilon(5S)$, to that of $\Upsilon(4S)$ can be understood as mainly coming from the difference between the $p$-values in their decays into open bottom channels, and the ratios are estimated numerically to be about 200-600 with reasonable choices of parameters. The absolute and relative rates of $\Upsilon(5S)\to\Upsilon(1S,2S,3S)\pi^+\pi^-$ and $\Upsilon(5S)\to\Upsilon(1S)K^+K^-$ are roughly consistent with data. We emphasize that the dipion transitions observed for some of the newly discovered $Y$ states associated with charmonia may have similar features to the dipion transitions of $\Upsilon(5S)$. Measurements on the dipion transitions of $\Upsilon(6S)$ could provide further test for this mechanism.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 23:56:52 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 13:58:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Meng", "Ce", "" ], [ "Chao", "Kuang-Ta", "" ] ]
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712.3596
Anatoly Kolomeisky
Max N. Artyomov, Alexander Yu. Morozov and Anatoly B. Kolomeisky
Molecular Motors Interacting with Their Own Tracks
null
null
10.1103/PhysRevE.77.040901
null
cond-mat.soft cond-mat.stat-mech
null
Dynamics of molecular motors that move along linear lattices and interact with them via reversible destruction of specific lattice bonds is investigated theoretically by analyzing exactly solvable discrete-state ``burnt-bridge'' models. Molecular motors are viewed as diffusing particles that can asymmetrically break or rebuild periodically distributed weak links when passing over them. Our explicit calculations of dynamic properties show that coupling the transport of the unbiased molecular motor with the bridge-burning mechanism leads to a directed motion that lowers fluctuations and produces a dynamic transition in the limit of low concentration of weak links. Interaction between the backward biased molecular motor and the bridge-burning mechanism yields a complex dynamic behavior. For the reversible dissociation the backward motion of the molecular motor is slowed down. There is a change in the direction of the molecular motor's motion for some range of parameters. The molecular motor also experiences non-monotonic fluctuations due to the action of two opposing mechanisms: the reduced activity after the burned sites and locking of large fluctuations. Large spatial fluctuations are observed when two mechanisms are comparable. The properties of the molecular motor are different for the irreversible burning of bridges where the velocity and fluctuations are suppressed for some concentration range, and the dynamic transition is also observed. Dynamics of the system is discussed in terms of the effective driving forces and transitions between different diffusional regimes.
[ { "version": "v1", "created": "Thu, 20 Dec 2007 23:35:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Artyomov", "Max N.", "" ], [ "Morozov", "Alexander Yu.", "" ], [ "Kolomeisky", "Anatoly B.", "" ] ]
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712.3597
Ryan Kalas
Ryan M. Kalas, D. Blume
Dilute Bose gases interacting via power-law potentials
7 pages, 4 figures
null
10.1103/PhysRevA.77.032703
null
cond-mat.other
null
Neutral atoms interact through a van der Waals potential which asymptotically falls off as r^{-6}. In ultracold gases, this interaction can be described to a good approximation by the atom-atom scattering length. However, corrections arise that depend on the characteristic length of the van der Waals potential. We parameterize these corrections by analyzing the energies of two- and few-atom systems under external harmonic confinement, obtained by numerically and analytically solving the Schrodinger equation. We generalize our results to particles interacting through a longer-ranged potential which asymptotically falls off as r^{-4}.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 00:24:41 GMT" } ]
2009-11-13T00:00:00
[ [ "Kalas", "Ryan M.", "" ], [ "Blume", "D.", "" ] ]
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712.3598
Radu A. Ionas
Radu A. Ionas
Elliptic constructions of hyperkaehler metrics I: The Atiyah-Hitchin manifold
40 pages, 1 figure
null
null
YITP-SB-07-39
math.DG hep-th
null
This is the first in a series of papers in which we develop a twistor-based method of constructing hyperkaehler metrics from holomorphic functions and elliptic curves. As an application, we revisit the Atiyah-Hitchin manifold and derive in an explicit holomorphic coordinate basis closed-form formulas for, among other things, the metric, the holomorphic symplectic form and all three Kaehler potentials.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 17:41:18 GMT" } ]
2008-01-05T00:00:00
[ [ "Ionas", "Radu A.", "" ] ]
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712.3599
Steve Zelditch
Jian Song and Steve Zelditch
Test configurations, large deviations and geodesic rays on toric varieties
42 pages, no figures
Advances in Mathematics 229 (2012) pp. 2338-2378
null
null
math.DG math.CV
null
This article contains a detailed study, in the toric case, of the test configuration geodesic rays defined by Phong-Sturm. We show that the `Bergman approximations' of Phong-Sturm converge in C^1 to the geodesic ray and that the geodesic ray itself is C^{1,1} and no better. The \kahler metrics associated to the geodesic ray of potentials are discontinuous across certain hypersurfaces and are degenerate on certain open sets. A novelty in the analysis is the connection between Bergman metrics, Bergman kernels and the theory of large deviations.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 00:29:23 GMT" } ]
2012-01-31T00:00:00
[ [ "Song", "Jian", "" ], [ "Zelditch", "Steve", "" ] ]
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712.36
Radu A. Ionas
Radu A. Ionas
Elliptic constructions of hyperkaehler metrics II: The quantum mechanics of a Swann bundle
25 pages, 3 figures
null
null
YITP-SB-07-40
math.DG hep-th
null
The generalized Legendre transform method of Lindstrom and Rocek yields hyperkaehler metrics from holomorphic functions. Its main ingredients are sections of ${\cal O}(2j)$ bundles over the twistor space satisfying a reality condition with respect to antipodal conjugation on the hyperkaehler sphere of complex structures. Formally, the structure of the real ${\cal O}(2j)$ sections is identical to that of quantum-mechanical wave functions describing the states of a particle with spin $j$ in the spin coherent representation. We analyze these sections and their SO(3) invariants and illustrate our findings with two Swann bundle constructions.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 17:43:32 GMT" } ]
2008-01-05T00:00:00
[ [ "Ionas", "Radu A.", "" ] ]
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712.3601
Radu A. Ionas
Radu A. Ionas
Elliptic constructions of hyperkaehler metrics III: Gravitons and Poncelet polygons
26 pages, 7 figures
null
null
YITP-SB-07-41
math.DG hep-th
null
In the generalized Legendre approach, the equation describing an asymptotically locally Euclidean space of type $D_n$ is found to admit an algebraic formulation in terms of the group law on a Weierstrass cubic. This curve has the structure of a Cayley cubic for a pencil generated by two transversal plane conics, that is, it takes the form $Y^2 = \det ({\cal A}+X{\cal B})$, where ${\cal A}$ and ${\cal B}$ are the defining $3 \times 3$ matrices of the conics. In this light, the equation can be interpreted as the closure condition for an elliptic billiard trajectory tangent to the conic ${\cal B}$ and bouncing into various conics of the pencil determined by the positions of the monopoles. Poncelet's porism guarantees then that once a trajectory closes to a star polygon, any trajectory will close, regardless of the starting point and after the same number of steps.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 17:45:44 GMT" } ]
2008-01-05T00:00:00
[ [ "Ionas", "Radu A.", "" ] ]
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712.3602
Zong-Hong Zhu
Zong-Hong Zhu, Ming Hu, J. S. Alcaniz, Yu-Xing Liu
Testing power-law cosmology with galaxy clusters
8 pages, 2 figures, 1 table, accepted for publication in A&A
Astro.Astrophys. 483 (2008) 15-18
10.1051/0004-6361:20077797
null
astro-ph
null
Power-law cosmologies, in which the cosmological scale factor evolves as a power law in the age, $a \propto t^{\alpha}$ with $\alpha \ga 1$, regardless of the matter content or cosmological epoch, is comfortably concordant with a host of cosmological observations.} {In this article, we use recent measurements of the X-ray gas mass fractions in clusters of galaxies to constrain the $\alpha$ parameter with curvature $k = \pm1, 0$. We find that the best fit happens for an open scenario with the power index $\alpha = 1.14 \pm 0.05$, though the flat and closed model can not be rule out at very high confidence level.} {Our results are in agreement with other recent analyses and show that the X-ray gas mass fraction measurements in clusters of galaxies provide a complementary test to the power law cosmology.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 00:44:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhu", "Zong-Hong", "" ], [ "Hu", "Ming", "" ], [ "Alcaniz", "J. S.", "" ], [ "Liu", "Yu-Xing", "" ] ]
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712.3603
Zong-Hong Zhu
Xing Wu and Zong-Hong Zhu
Reconstructing f(R) theory according to holographic dark energy
6 pages, 4 figures, accepted for publication in Physics Letters B
Phys.Lett.B660:293-298,2008
10.1016/j.physletb.2007.12.031
null
astro-ph
null
In this paper a connection between the holographic dark energy model and the $f(R)$ theory is established. We treat the $f(R)$ theory as an effective description for the holographic dark energy and reconstruct the function $f(R)$ with the parameter $c>1$, $c=1$ and $c<1$, respectively. We show the distinctive behavior of each cases realized in $f(R)$ theory, especially for the future evolution.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 00:45:12 GMT" }, { "version": "v2", "created": "Sun, 23 Dec 2007 05:55:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Wu", "Xing", "" ], [ "Zhu", "Zong-Hong", "" ] ]
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712.3604
Zong-Hong Zhu
Xing Wu, Rong-Gen Cai, Zong-Hong Zhu
Dynamics of holographic vacuum energy in the DGP model
11 pages, 18 figures, accepted for publication in Physical Review D
Phys.Rev.D77:043502,2008
10.1103/PhysRevD.77.043502
null
astro-ph
null
We consider the evolution of the vacuum energy in the DGP model according to the holographic principle under the assumption that the relation linking the IR and UV cut-offs still holds in this scenario. The model is studied when the IR cut-off is chosen to be the Hubble scale $H^{-1}$, the particle horizon $R_{\rm ph}$ and the future event horizon $R_{\rm eh}$, respectively. And the two branches of the DGP model are also taken into account. Through numerical analysis, we find that in the cases of $H^{-1}$ in the (+) branch and $R_{\rm eh}$ in both branches, the vacuum energy can play the role of dark energy. Moreover, when considering the combination of the vacuum energy and the 5D gravity effect in both branches, the equation of state of the effective dark energy may cross -1, which may lead to the Big Rip singularity. Besides, we constrain the model with the Type Ia supernovae and baryon oscillation data and find that our model is consistent with current data within $1\sigma$, and that the observations prefer either a pure holographic dark energy or a pure DGP model
[ { "version": "v1", "created": "Fri, 21 Dec 2007 00:45:48 GMT" } ]
2008-11-26T00:00:00
[ [ "Wu", "Xing", "" ], [ "Cai", "Rong-Gen", "" ], [ "Zhu", "Zong-Hong", "" ] ]
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712.3605
Xin L\"u
Yajie Xu, Zhi Ma, Chunyuan Zhang, Xin L\"u
Logic Functions and Quantum Error Correcting Codes
12 pages
null
null
null
quant-ph
null
In this paper, based on the relationship between logic functions and quantum error correcting codes(QECCs), we unify the construction of QECCs via graphs, projectors and logic functions. A construction of QECCs over a prime field GF(p) is given, and one of the results given by Ref[8] can be viewed as a corollary of one theorem in this paper. With the help of Boolean functions, we give a clear proof of the existence of a graphical QECC in mathematical view, and find that the existence of an [[n,k,d]] QECC over GF(p) requires similar conditions with that depicted in Ref[9]. The result that under the correspondence defined in Ref[17], every [[n,0,d]] QECC over GF(2) corresponding to a simple undirected graph has a Boolean basis state, which is closely related to the adjacency matrix of the graph, is given. After a modification of the definition of operators, we find that some QECCs constructed via projectors depicted in Ref[11] can have Boolean basis states. A necessary condition for a Boolean function being used in the construction via projectors is given. We also give some examples to illustrate our results.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 00:55:22 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 14:31:18 GMT" }, { "version": "v3", "created": "Wed, 2 Jan 2008 09:27:55 GMT" }, { "version": "v4", "created": "Sun, 6 Jan 2008 08:53:20 GMT" } ]
2008-01-06T00:00:00
[ [ "Xu", "Yajie", "" ], [ "Ma", "Zhi", "" ], [ "Zhang", "Chunyuan", "" ], [ "Lü", "Xin", "" ] ]
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712.3606
Jiangyong Jia
Jiangyong Jia
Probe the QGP via dihadron correlations: Jet quenching and Medium-response
Invited talk at International Symposium on Multiparticle Dynamics (ISMD07), Berkeley, California, 4-9 Aug 2007. 5 pages 2 figures
Acta Phys.Polon.Supp.1:605-608,2008
null
null
nucl-ex
null
We summarize the di-hadron correlation results from RHIC, focusing on the high $p_T$ region and lower $p_T$ region for the away-side. The former is consistent with fragmentation of jets that surviving the medium, while the latter suggests the redistribution of the energy from the quenched jets. We also discuss the role of the jet in the intermediate $p_T$.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 00:59:43 GMT" } ]
2009-01-16T00:00:00
[ [ "Jia", "Jiangyong", "" ] ]
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712.3607
Yuan Young
Yuan N. Young, Jerzy Blawzdziewicz, Vitorio Cristini, Roy Goodman
Hysteretic and chaotic dynamics of viscous drops in creeping flows with rotation
22 pages, 13 figures. submitted to Journal of Fluid Mechanics
null
10.1017/S0022112008002036
null
cond-mat.soft cond-mat.mtrl-sci
null
It has been shown in our previous publication (Blawzdziewicz,Cristini,Loewenberg,2003) that high-viscosity drops in two dimensional linear creeping flows with a nonzero vorticity component may have two stable stationary states. One state corresponds to a nearly spherical, compact drop stabilized primarily by rotation, and the other to an elongated drop stabilized primarily by capillary forces. Here we explore consequences of the drop bistability for the dynamics of highly viscous drops. Using both boundary-integral simulations and small-deformation theory we show that a quasi-static change of the flow vorticity gives rise to a hysteretic response of the drop shape, with rapid changes between the compact and elongated solutions at critical values of the vorticity. In flows with sinusoidal temporal variation of the vorticity we find chaotic drop dynamics in response to the periodic forcing. A cascade of period-doubling bifurcations is found to be directly responsible for the transition to chaos. In random flows we obtain a bimodal drop-length distribution. Some analogies with the dynamics of macromolecules and vesicles are pointed out.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 01:02:19 GMT" } ]
2015-05-13T00:00:00
[ [ "Young", "Yuan N.", "" ], [ "Blawzdziewicz", "Jerzy", "" ], [ "Cristini", "Vitorio", "" ], [ "Goodman", "Roy", "" ] ]
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712.3608
M. Cristina Rabello-Soares
M.C. Rabello-Soares, S.G. Korzennik, J. Schou
Variations of the Solar Acoustic High-Degree Mode Frequencies over Solar Cycle 23
7 figures. Advances in Space Research (2007) - in press
Adv.SpaceRes.41:861-867,2008
10.1016/j.asr.2007.03.014
null
astro-ph
null
Using full-disk observations obtained with the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO) spacecraft, we present variations of the solar acoustic mode frequencies caused by the solar activity cycle. High-degree (100 < l < 900) solar acoustic modes were analyzed using global helioseismology analysis techniques over most of solar cycle 23. We followed the methodology described in details in Korzennik, Rabello-Soares and Schou (2004) to infer unbiased estimates of high-degree mode parameters (see also Rabello-Soares, Korzennik and Schou, 2006). We have removed most of the known instrumental and observational effects that affect specifically high-degree modes. We show that the high-degree changes are in good agreement with the medium-degree results, except for years when the instrument was highly defocused. We analyzed and discuss the effect of defocusing on high degree estimation. Our results for high-degree modes confirm that the frequency shift scaled by the relative mode inertia is a function of frequency and it is independent of degree.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 01:20:58 GMT" } ]
2008-11-26T00:00:00
[ [ "Rabello-Soares", "M. C.", "" ], [ "Korzennik", "S. G.", "" ], [ "Schou", "J.", "" ] ]
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712.3609
Michael B. Mensky
Michael B. Mensky
Postcorrection and mathematical model of life in Extended Everett's Concept
Comments: 24 pages, 1 figure, LaTeX, Journal URL: http://www.neuroquantology.com
NeuroQuantology Vol 5, No 4, 363-376 (2007)
null
null
physics.gen-ph quant-ph
null
Extended Everett's Concept (EEC) recently developed by the author to explain the phenomenon of consciousness is considered. A mathematical model is proposed for the principal feature of consciousness assumed in EEC, namely its ability (in the state of sleep, trance or meditation, when the explicit consciousness is disabled) to obtain information from all alternative classical realities (Everett's worlds) and select the favorable realities. To represent this ability, a mathematical operation called postcorrection is introduced, which corrects the present state to guarantee certain characteristics of the future state. Evolution of living matter is thus determined by goals (first of all by the goal of survival) as well as by causes. The resulting theory, in a way symmetrical in time direction, follows from a sort of antropic principle. Possible criteria for postcorrection and corresponding phenomena in the sphere of life are classified. Both individual and collective criteria of survival are considered as well as the criteria providing certain quality of life and those which are irrelevant to the life quality. The phenomena of free will and direct sighting of truth (e.g. scientific insight) are explained in these terms. The problem of artificial intellect and the role of brain look differently in the framework of this theory. Automats may perform intellectual operations, but not postcorrection, therefore artificial intellect but not an artificial life can be created. The brain serves as an interface between the body and consciousness, but the most profound level of consciousness is not a function of brain.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 14:18:21 GMT" } ]
2007-12-27T00:00:00
[ [ "Mensky", "Michael B.", "" ] ]
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712.361
Jindrich Kolorenc
Jindrich Kolorenc and Lubos Mitas
Quantum Monte Carlo calculations of structural properties of FeO under pressure
5 pages, 3 figures
Phys. Rev. Lett. 101, 185502 (2008)
10.1103/PhysRevLett.101.185502
null
cond-mat.mtrl-sci cond-mat.str-el
null
We determine the equation of state of stoichiometric FeO employing the diffusion Monte Carlo method. The fermionic nodes are fixed to those of a wave function having the form of a single Slater determinant. The calculated ambient pressure properties (lattice constant, bulk modulus and cohesive energy) agree very well with available experimental data. At approximately 65 GPa, the lattice structure is found to change from rocksalt type (B1) to NiAs based (inverse B8).
[ { "version": "v1", "created": "Fri, 21 Dec 2007 01:48:36 GMT" } ]
2008-10-29T00:00:00
[ [ "Kolorenc", "Jindrich", "" ], [ "Mitas", "Lubos", "" ] ]
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712.3611
Fran\c{c}ois Ghoulmi\'e Dr.
F. Ghoulmi\'e, M. Bartolozzi, C.P. Mellen, T. Di Matteo
Effects of diversification among assets in an agent-based market model
12 pages, 5 figures, accepted for publication in the Proceedings of the Complex Systems II Conference at the Australian National University, 4-7 December 2007, Canberra, ACT Australia
null
10.1117/12.758912
null
q-fin.TR physics.data-an physics.soc-ph
null
We extend to the multi-asset case the framework of a discrete time model of a single asset financial market developed in Ghoulmie et al (2005). In particular, we focus on adaptive agents with threshold behavior allocating their resources among two assets. We explore numerically the effect of this diversification as an additional source of complexity in the financial market and we discuss its destabilizing role. We also point out the relevance of these studies for financial decision making.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 02:05:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Ghoulmié", "F.", "" ], [ "Bartolozzi", "M.", "" ], [ "Mellen", "C. P.", "" ], [ "Di Matteo", "T.", "" ] ]
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712.3612
Yasunori Mawatari
Yasunori Mawatari and Kazuhiro Kajikawa
Hysteretic ac loss of polygonally arranged superconducting strips carrying ac transport current
3 pages, 3 figures, to be published in Applied Physics Letters (2008)
null
10.1063/1.2829793
null
cond-mat.supr-con
null
The hysteretic ac loss of a current-carrying conductor in which multiple superconducting strips are polygonally arranged around a cylindrical former is theoretically investigated as a model of superconducting cables. Using the critical state model, we analytically derive the ac loss $Q_n$ of a total of $n$ strips. The normalized loss $Q_n/Q_1$ is determined by the number of strips $n$ and the ratio of the strip width $2w$ to the diameter $2R$ of the cylindrical former. When $n>> 1$ and $w/R<< 1$, the behavior of $Q_n$ is similar to that of an infinite array of coplanar strips.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 02:19:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Mawatari", "Yasunori", "" ], [ "Kajikawa", "Kazuhiro", "" ] ]
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712.3613
Stephen Serjeant
S. Serjeant, S. Dye, A. Mortier, J. Peacock, E. Egami, M. Cirasuolo, G. Rieke, C. Borys, D. Clements, K. Coppin, J. Dunlop, S. Eales, D. Farrah, M. Halpern, P. Mauskopf, A. Pope, M. Rowan-Robinson, D. Scott, I. Smail, M. Vaccari
The SCUBA Half Degree Extragalactic Survey (SHADES) - IX: the environment, mass and redshift dependence of star formation
Accepted by MNRAS. SMG environments analysis extended. 17 pages, 18 figures. Includes BoxedEPS
null
10.1111/j.1365-2966.2008.13197.x
null
astro-ph
null
We present a comparison between the SCUBA Half Degree Extragalactic Survey (SHADES) at 450 and 850 microns in the Lockman Hole East with a deep Spitzer Space Telescope survey at 3.6-24 microns conducted in Guaranteed Time. Using stacking analyses we demonstrate a striking correspondence between the galaxies contributing the submm extragalactic background light, with those likely to dominate the backgrounds at Spitzer wavelengths. Using a combination BRIzK plus Spitzer photometric redshifts, we show that at least a third of the Spitzer-identified submm galaxies at 1<z<1.5 appear to reside in overdensities when the density field is smoothed at 0.5-2 Mpc comoving diameters, supporting the high-redshift reversal of the local star formation - galaxy density relation. We derive the dust-shrouded cosmic star formation history of galaxies as a function of assembled stellar masses. For model stellar masses <10^11 Msun, this peaks at lower redshifts than the ostensible z~2.2 maximum for submm point sources, adding to the growing consensus for ``downsizing'' in star formation. Our surveys are also consistent with ``downsizing'' in mass assembly. Both the mean star formation rates <dM/dt> and specific star formation rates <(1/M)dM/dt> are in striking disagreement with some semi-analytic predictions from the Millenium simulation. The discrepancy could either be resolved with a top-heavy initial mass function, or a significant component of the submm flux heated by the interstellar radiation field.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 14:29:20 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 14:00:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Serjeant", "S.", "" ], [ "Dye", "S.", "" ], [ "Mortier", "A.", "" ], [ "Peacock", "J.", "" ], [ "Egami", "E.", "" ], [ "Cirasuolo", "M.", "" ], [ "Rieke", "G.", "" ], [ "Borys", "C.", "" ], [ "Clements", "D.", "" ], [ "Coppin", "K.", "" ], [ "Dunlop", "J.", "" ], [ "Eales", "S.", "" ], [ "Farrah", "D.", "" ], [ "Halpern", "M.", "" ], [ "Mauskopf", "P.", "" ], [ "Pope", "A.", "" ], [ "Rowan-Robinson", "M.", "" ], [ "Scott", "D.", "" ], [ "Smail", "I.", "" ], [ "Vaccari", "M.", "" ] ]
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712.3614
Gregg Wade
G.A. Wade, J. Silvester, K. Bale, N. Johnson, J. Power, M. Auri\`ere, F. Ligni\'eres, B. Dintrans, J.-F. Donati, A. Hui Bon Hoa, D. Mouillet, S. Naseri, F. Paletou, P. Petit, F. Rincon, N. Toque, S. Bagnulo, C.P. Folsom, J.D. Landstreet, M. Gruberbauer, T. Lueftinger, S. Jeffers, A. L\`ebre, S. Marsden
Why are some A stars magnetic, while most are not?
6 pages, 2 figures. Proceedings of Solar Polarisation Workshop #5
null
null
null
astro-ph
null
A small fraction of intermediate-mass main sequence (A and B type) stars have strong, organised magnetic fields. The large majority of such stars, however, show no evidence for magnetic fields, even when observed with very high precision. In this paper we describe a simple model, motivated by qualitatively new observational results, that provides a natural physical explanation for the small fraction of observed magnetic stars.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 02:27:36 GMT" } ]
2007-12-24T00:00:00
[ [ "Wade", "G. A.", "" ], [ "Silvester", "J.", "" ], [ "Bale", "K.", "" ], [ "Johnson", "N.", "" ], [ "Power", "J.", "" ], [ "Aurière", "M.", "" ], [ "Ligniéres", "F.", "" ], [ "Dintrans", "B.", "" ], [ "Donati", "J. -F.", "" ], [ "Hoa", "A. Hui Bon", "" ], [ "Mouillet", "D.", "" ], [ "Naseri", "S.", "" ], [ "Paletou", "F.", "" ], [ "Petit", "P.", "" ], [ "Rincon", "F.", "" ], [ "Toque", "N.", "" ], [ "Bagnulo", "S.", "" ], [ "Folsom", "C. P.", "" ], [ "Landstreet", "J. D.", "" ], [ "Gruberbauer", "M.", "" ], [ "Lueftinger", "T.", "" ], [ "Jeffers", "S.", "" ], [ "Lèbre", "A.", "" ], [ "Marsden", "S.", "" ] ]
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712.3615
Kunihito Uzawa
Pierre Binetruy, Misao Sasaki, Kunihito Uzawa
Dynamical D4-D8 and D3-D7 branes in supergravity
25 pages, no figure, typos corrected, references and discussions of D3-D7 brane solutions added
Phys.Rev.D80:026001,2009
10.1103/PhysRevD.80.026001
null
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a class of dynamical solutions for intersecting D4-D8 and D3-D7 brane systems in ten-dimensional type IIA and IIB supergravity. We discuss if these solutions can be recovered in lower-dimensional effective theories for the warped compactification of a general p-brane system. It is found that an effective $p+1$-dimensional description is not possible in general due to the entanglement of the transverse coordinates and the $p+1$-dimensional coordinates in the metric components. For the D4-D8 brane system, the dynamical solutions reduces to a static warped ${\rm AdS_6}\times {\rm S}^4$ geometry in a certain spacetime region. For the D3-D7 brane system, we find a dynamical solution whose metric form is similar to that of a D3-brane solution. The main difference is the existence of a nontrivial dilaton configuration in the D3-D7 solution. Then we discuss cosmology of these solutions. We find that they behave like a Kasner-type cosmological solution at $\tau\to\infty$, while it reduces to a warped static solution at $\tau\to0$, where $\tau$ is the cosmic time.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 02:53:30 GMT" }, { "version": "v2", "created": "Tue, 7 Jul 2009 08:42:45 GMT" } ]
2009-09-29T00:00:00
[ [ "Binetruy", "Pierre", "" ], [ "Sasaki", "Misao", "" ], [ "Uzawa", "Kunihito", "" ] ]
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712.3616
Ki-Myeong Lee
Jens Hoppe (KTH, Sweden) and Ki-Myeong Lee (KIAS, Korea)
New BPS Configurations of BMN Matrix Theory
19 pages, No Figurers, JHEP stype
JHEP 0806:041,2008
10.1088/1126-6708/2008/06/041
KIAS-P007075
hep-th
null
We explore the 1/2 BPS configurations in BMN matrix theory with SO(3) angular momentum of $SO(3)\times SO(6)$ symmetry. The fluctuation analysis of the BPS configurations near the abelian solutions and also the fuzzy two sphere vacua reveals how nonabelian BPS configurations emerge. Especially the irreducible nonabelian configurations seem to have the maximal angular momentum of order $N^3$, beyond which they collapse to abelian ones. We also find some new BPS configurations explicitly.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 02:43:31 GMT" } ]
2014-11-18T00:00:00
[ [ "Hoppe", "Jens", "", "KTH, Sweden" ], [ "Lee", "Ki-Myeong", "", "KIAS, Korea" ] ]
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712.3617
Erhan Bayraktar
Erhan Bayraktar, Bo Yang
A Unified Framework for Pricing Credit and Equity Derivatives
Keywords: Credit Default Swap, Defaultable Bond, Defaultable Stock, Equity Options, Stochastic Interest Rate, Implied Volatility, Multiscale Perturbation Method
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a model which can be jointly calibrated to the corporate bond term structure and equity option volatility surface of the same company. Our purpose is to obtain explicit bond and equity option pricing formulas that can be calibrated to find a risk neutral model that matches a set of observed market prices. This risk neutral model can then be used to price more exotic, illiquid or over-the-counter derivatives. We observe that the model implied credit default swap (CDS) spread matches the market CDS spread and that our model produces a very desirable CDS spread term structure. This is observation is worth noticing since without calibrating any parameter to the CDS spread data, it is matched by the CDS spread that our model generates using the available information from the equity options and corporate bond markets. We also observe that our model matches the equity option implied volatility surface well since we properly account for the default risk premium in the implied volatility surface. We demonstrate the importance of accounting for the default risk and stochastic interest rate in equity option pricing by comparing our results to Fouque, Papanicolaou, Sircar and Solna (2003), which only accounts for stochastic volatility.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 02:53:38 GMT" }, { "version": "v2", "created": "Sat, 20 Sep 2008 21:44:00 GMT" } ]
2008-09-21T00:00:00
[ [ "Bayraktar", "Erhan", "" ], [ "Yang", "Bo", "" ] ]
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712.3618
Aiyou Chen
Aiyou Chen, Jin Cao, and Tian Bu
Network Tomography: Identifiability and Fourier Domain Estimation
21 pages
IEEE INFOCOM 2007, p.1875-1883
10.1109/INFCOM.2007.218
null
stat.ME math.ST stat.AP stat.CO stat.TH
null
The statistical problem for network tomography is to infer the distribution of $\mathbf{X}$, with mutually independent components, from a measurement model $\mathbf{Y}=A\mathbf{X}$, where $A$ is a given binary matrix representing the routing topology of a network under consideration. The challenge is that the dimension of $\mathbf{X}$ is much larger than that of $\mathbf{Y}$ and thus the problem is often called ill-posed. This paper studies some statistical aspects of network tomography. We first address the identifiability issue and prove that the $\mathbf{X}$ distribution is identifiable up to a shift parameter under mild conditions. We then use a mixture model of characteristic functions to derive a fast algorithm for estimating the distribution of $\mathbf{X}$ based on the General method of Moments. Through extensive model simulation and real Internet trace driven simulation, the proposed approach is shown to be favorable comparing to previous methods using simple discretization for inferring link delays in a heterogeneous network.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 03:47:28 GMT" } ]
2007-12-24T00:00:00
[ [ "Chen", "Aiyou", "" ], [ "Cao", "Jin", "" ], [ "Bu", "Tian", "" ] ]
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712.3619
Fuming Liu
Fu-Ming Liu, Klaus Werner
A Systematic Study on Direct Photon Production from Central Heavy Ion Collisions
13 pages 19 figures
J.Phys.G36:035101,2009
10.1088/0954-3899/36/3/035101
null
hep-ph
null
We investigate the production of direct photons in central Au-Au collisions at the relativistic Heavy-Ion Collider (RHIC) at 200 GeV per nucleon, considering all possible sources. We treat thermal photons emitted from a quark-gluon plasma and from a hadron gas, based on a realistic thermodynamic expansion. Hard photons from elementary nucleon-nucleon scatterings are included: primordial elementary scatterings are certainly dominant at large transverse momenta, but also secondary photons from jet fragmentation and jet-photon conversion cannot be ignored. In both cases we study the effect of energy loss, and we also consider photons emitted from bremsstrahlung gluons via fragmentation.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 04:05:50 GMT" }, { "version": "v2", "created": "Sat, 29 Dec 2007 13:16:16 GMT" } ]
2009-02-02T00:00:00
[ [ "Liu", "Fu-Ming", "" ], [ "Werner", "Klaus", "" ] ]
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712.362
Joshua Combes
Joshua Combes and Howard M. Wiseman, Kurt Jacobs
Rapid Measurement of Quantum Systems using Feedback Control
4 pages, 4 figures. V2: Minor corrections
Phys. Rev. Lett. 100, 160503 (2008)
10.1103/PhysRevLett.100.160503
null
quant-ph math.OC
null
We introduce a feedback control algorithm that increases the speed at which a measurement extracts information about a $d$-dimensional system by a factor that scales as $d^2$. Generalizing this algorithm, we apply it to a register of $n$ qubits and show an improvement O(n). We derive analytical bounds on the benefit provided by the feedback and perform simulations that confirm that this speedup is achieved.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 06:52:33 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 04:41:07 GMT" } ]
2009-08-15T00:00:00
[ [ "Combes", "Joshua", "" ], [ "Wiseman", "Howard M.", "" ], [ "Jacobs", "Kurt", "" ] ]
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712.3621
Vladimir Dzuba
V. A. Dzuba and V. V. Flambaum
Relativistic corrections to transition frequencies of Ag I, Dy I, Ho I, Yb II, Yb III, Au I and Hg II and search for variation of the fine structure constant
6 pages, 5 tables
Phys. Rev. A, 77, 012515 (2008)
10.1103/PhysRevA.77.012515
null
physics.atom-ph
null
Dependence of transition frequencies on the fine structure constant $\alpha=e^2/\hbar c$ is calculated for several many-electron systems which are used or planned to be used in the laboratory search for the time variation of the fine structure constant. In systems with a large number of electrons in open shells (from 11 to 15) the relative effects of the variation may be strongly enhanced. For the transitions which were considered before the results are in good agreement with previous calculations.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 04:44:38 GMT" } ]
2009-11-13T00:00:00
[ [ "Dzuba", "V. A.", "" ], [ "Flambaum", "V. V.", "" ] ]
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712.3622
Sungchul Kwon
Dong-Jin Lee, Sungchul Kwon, and Yup Kim
Conserved mass aggregation model with mass-dependent fragmentation
4 pages, 2 figures, to be appeared in J. Korean Phys. Soc. (2008)
null
10.3938/jkps.52.154
null
cond-mat.stat-mech
null
We study a conserved mass aggregation model with mass-dependent fragmentation in one dimension. In the model, the whole mass $m$ of a site isotropically diffuse with unit rate. With rate $\omega$, a mass $m^{\lambda}$ is fragmented from the site and moves to a randomly selected nearest neighbor site. Since the fragmented mass is smaller than the whole mass $m$ of a site for $\lambda < 1$, the on-site attractive interaction exists for the case. For $\lambda = 0$, the model is known to undergo the condensation phase transitions from a fluid phase into a condensed phase as the density of total masses ($\rho$) increases beyond a critical density $\rho_c$. For $0< \lambda <1$, we numerically confirm for several values of $\omega$ that $\rho_c$ diverges with the system size $L$. Hence in thermodynamic limit, the condensed phase disappears and no transitions take place in one dimension. We also explain that there are no transitions in any dimensions.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 04:44:20 GMT" } ]
2015-05-13T00:00:00
[ [ "Lee", "Dong-Jin", "" ], [ "Kwon", "Sungchul", "" ], [ "Kim", "Yup", "" ] ]
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712.3623
Ping Zhang
Bo Sun, Ping Zhang, Xian-Geng Zhao
First-principles LDA+U and GGA+U study of plutonium oxides
To appear in J. Chem. Phys
null
null
null
cond-mat.mtrl-sci cond-mat.str-el
null
The electronic structure and properties of PuO$_{2}$ and Pu$_{2}$O$_{3}$ have been studied from first principles by the all-electron projector-augmented-wave (PAW) method. The local density approximation (LDA)+$U$ and the generalized gradient approximation (GGA)+$U$ formalism have been used to account for the strong on-site Coulomb repulsion among the localized Pu $5f$ electrons. We discuss how the properties of PuO$_{2}$ and Pu$_{2}$O$_{3}$ are affected by the choice of $U$ as well as the choice of exchange-correlation potential. Also, oxidation reaction of Pu$_{2}$O$_{3}$, leading to formation of PuO$_{2}$, and its dependence on $U$ and exchange-correlation potential have been studied. Our results show that by choosing an appropriate $U$ it is promising to correctly and consistently describe structural, electronic, and thermodynamic properties of PuO$_{2}$ and Pu$_{2}$O$_{3}$, which enables it possible the modeling of redox process involving Pu-based materials.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 05:24:41 GMT" } ]
2007-12-24T00:00:00
[ [ "Sun", "Bo", "" ], [ "Zhang", "Ping", "" ], [ "Zhao", "Xian-Geng", "" ] ]
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712.3624
U. Zuelicke
D. Csontos, U. Zuelicke (Massey University)
Tailoring hole spin splitting and polarization in nanowires
3.1 pages, 4 figures, RevTex4, to appear in APL
Appl. Phys. Lett. 92, 023108 (2008)
10.1063/1.2834702
null
cond-mat.mes-hall
null
Spin splitting in p-type semiconductor nanowires is strongly affected by the interplay between quantum confinement and spin-orbit coupling in the valence band. The latter's particular importance is revealed in our systematic theoretical study presented here, which has mapped the range of spin-orbit coupling strengths realized in typical semiconductors. Large controllable variations of the g-factor with associated characteristic spin polarization are shown to exist for nanowire subband edges, which therefore turn out to be a versatile laboratory for investigating the complex spin properties exhibited by quantum-confined holes.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 05:45:57 GMT" } ]
2008-01-16T00:00:00
[ [ "Csontos", "D.", "", "Massey University" ], [ "Zuelicke", "U.", "", "Massey University" ] ]
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712.3625
K. Narayan
K. Narayan
On the internal structure of dyons in ${\cal N}=4$ super Yang-Mills theories
Latex, 29 pgs, 5 eps figures; v2: typos fixed, minor clarifications on internal faces
Phys.Rev.D77:046004,2008
10.1103/PhysRevD.77.046004
null
hep-th
null
We use the low energy effective $U(1)^r$ action on the Coulomb branch of ${\cal N}=4$ super Yang-Mills theory to construct approximate field configurations for solitonic dyons in these theories, building on the brane prong description developed in hep-th/0101114. This dovetails closely with the corresponding description of these dyons as string webs stretched between D-branes in the transverse space. The resulting picture within these approximations shows the internal structure of these dyons (for fixed asymptotic charges) to be molecule-like, with multiple charge cores held together at equilibrium separations, which grow large near lines of marginal stability. Although these techniques do not yield a complete solution for the spatial structure (i.e. all core sizes and separations) of large charge multicenter dyons in high rank gauge theories, approximate configurations can be found in specific regions of moduli space, which become increasingly accurate near lines of marginal stability. We also discuss string webs with internal faces from this point of view.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:46:39 GMT" }, { "version": "v2", "created": "Fri, 28 Dec 2007 06:51:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Narayan", "K.", "" ] ]
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712.3626
Jiang Qian
Jiang Qian, Pabitra N. Sen
Time dependent diffusion in a disordered medium with partially absorbing walls: A perturbative approach
null
Journal of Chemical Physics, vol. 125, 194508, 2008
10.1063/1.2372497
null
cond-mat.stat-mech cond-mat.dis-nn
null
We present an analytical study of the time dependent diffusion coefficient in a dilute suspension of spheres with partially absorbing boundary condition. Following Kirkpatrick (J. Chem. Phys. 76, 4255) we obtain a perturbative expansion for the time dependent particle density using volume fraction $f$ of spheres as an expansion parameter. The exact single particle $t$-operator for partially absorbing boundary condition is used to obtain a closed form time-dependent diffusion coefficient $D(t)$ accurate to first order in the volume fraction $f$. Short and long time limits of $D(t)$ are checked against the known short-time results for partially or fully absorbing boundary conditions and long-time results for reflecting boundary conditions. For fully absorbing boundary condition the long time diffusion coefficient is found to be $D(t)=5 a^2/(12 f D_{0} t) +O((D_0t/a^2)^{-2})$, to the first order of perturbation theory. Here $f$ is small but non-zero, $D_0$ the diffusion coefficient in the absence of spheres, and $a$ the radius of the spheres. The validity of this perturbative result is discussed.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 05:54:45 GMT" } ]
2012-10-29T00:00:00
[ [ "Qian", "Jiang", "" ], [ "Sen", "Pabitra N.", "" ] ]
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712.3627
Ailin Zhang
Ailin Zhang
Exotica possibility of new observations by BES
8 pages, talk given at XII International Conference on Hadron Spectroscopy(Hadron 07), Frascati, Rome, 8-13 October, 2007
null
null
null
hep-ph
null
The employment of interpolating currents of existed studies of four-quark state and glueball with QCD sum rule approach is analyzed. In terms of suitable currents, the masses of the lowest lying scalar and pseudo-scalar glueball were determined. The masses of some tetraquark states and their first orbital excitations were obtained through a combination of the sum rule with the constituent quark model. Exotica possibility of the new observations by BES is discussed.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 06:42:04 GMT" } ]
2007-12-24T00:00:00
[ [ "Zhang", "Ailin", "" ] ]
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712.3628
Andreas Winter
Toby Cubitt, Aram W. Harrow, Debbie Leung, Ashley Montanaro, Andreas Winter
Counterexamples to additivity of minimum output p-Renyi entropy for p close to 0
7 pages, revtex4; v2 added correct ref. [15]; v3 has more information on the numerical violation as well as 1 figure (2 graphs) - note that the explicit example was changed and the more conservative estimate of the bound up to which violations occur, additionally some other small issues are straightened out
Communications in Mathematical Physics, volume 284, p281-290 (2008)
10.1007/s00220-008-0625-z
null
quant-ph
null
Complementing recent progress on the additivity conjecture of quantum information theory, showing that the minimum output p-Renyi entropies of channels are not generally additive for p>1, we demonstrate here by a careful random selection argument that also at p=0, and consequently for sufficiently small p, there exist counterexamples. An explicit construction of two channels from 4 to 3 dimensions is given, which have non-multiplicative minimum output rank; for this pair of channels, numerics strongly suggest that the p-Renyi entropy is non-additive for all p < 0.11. We conjecture however that violations of additivity exist for all p<1.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 06:47:47 GMT" }, { "version": "v2", "created": "Sat, 22 Dec 2007 05:06:11 GMT" }, { "version": "v3", "created": "Thu, 14 Feb 2008 22:43:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Cubitt", "Toby", "" ], [ "Harrow", "Aram W.", "" ], [ "Leung", "Debbie", "" ], [ "Montanaro", "Ashley", "" ], [ "Winter", "Andreas", "" ] ]
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712.3629
Masao Jinzenji
Masao Jinzenji (Hokkaido University)
Virtual Structure Constants as Intersection Numbers of Moduli Space of Polynomial Maps with Two Marked Points
10 pages, latex, a minor change in Section 4, English is refined, Some typing errors in Section 3 are corrected
Letters in Mathematical Physics, Vol.86, No.2-3, 99-114 (2008)
10.1007/s11005-008-0278-z
null
math.AG hep-th
null
In this paper, we derive the virtual structure constants used in mirror computation of degree k hypersurface in CP^{N-1}, by using localization computation applied to moduli space of polynomial maps from CP^{1} to CP^{N-1} with two marked points. We also apply this technique to non-nef local geometry O(1)+O(-3)->CP^{1} and realize mirror computation without using Birkhoff factorization.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 06:55:49 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 07:47:45 GMT" }, { "version": "v3", "created": "Thu, 17 Jan 2008 06:35:40 GMT" } ]
2008-12-04T00:00:00
[ [ "Jinzenji", "Masao", "", "Hokkaido University" ] ]
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712.363
Sven Heinemeyer
S. Heinemeyer, M. Mondragon, G. Zoupanos
Confronting Finite Unified Theories with Low-Energy Phenomenology
25 pages, 8 figures. Discussion on models and on cold dark matter constraint extended, references added. Version to appear in JHEP
JHEP 0807:135,2008
10.1088/1126-6708/2008/07/135
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Finite Unified Theories (FUTs) are N=1 supersymmetric Grand Unified Theories that can be made all-loop finite. The requirement of all-loop finiteness leads to a severe reduction of the free parameters of the theory and, in turn, to a large number of predictions. FUTs are investigated in the context of low-energy phenomenology observables. We present a detailed scanning of the all-loop finite SU(5) FUTs, where we include the theoretical uncertainties at the unification scale and we apply several phenomenological constraints. Taking into account the restrictions from the top and bottom quark masses, we can discriminate between different models. Including further low-energy constraints such as B physics observables, the bound on the lightest Higgs boson mass and the cold dark matter density, we determine the predictions of the allowed parameter space for the Higgs boson sector and the supersymmetric particle spectrum of the selected model.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:37:58 GMT" }, { "version": "v2", "created": "Tue, 29 Jul 2008 08:31:56 GMT" } ]
2009-01-06T00:00:00
[ [ "Heinemeyer", "S.", "" ], [ "Mondragon", "M.", "" ], [ "Zoupanos", "G.", "" ] ]
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712.3631
Rabin Banerjee
Rabin Banerjee, Subir Ghosh and T. Shreecharan
Three dimensional noncommutative bosonization
LaTex, 9 pages, no figures
Phys.Lett.B662:231-236,2008
10.1016/j.physletb.2008.02.043
null
hep-th
null
We consider the extension of the 2+1-dimensional bosonization process in Non-Commutative (NC) spacetime. We show that the large mass limit of the effective action obtained by integrating out the fermionic fields in NC spacetime leads to the NC Chern-Simons action. The present result is valid to all orders in the noncommutative parameter $\theta$. We also discuss how the NC Yang-Mills action is induced in the next to leading order.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:45:40 GMT" } ]
2008-11-26T00:00:00
[ [ "Banerjee", "Rabin", "" ], [ "Ghosh", "Subir", "" ], [ "Shreecharan", "T.", "" ] ]
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712.3632
P. F. Chen
P. F. Chen
Initiation and propagation of coronal mass ejections
8 pages, 1 figure, an invited review, to appear in J. Astrophys. Astron
null
10.1007/s12036-008-0023-0
null
astro-ph
null
This paper reviews recent progress in the research on the initiation and propagation of CMEs. In the initiation part, several trigger mechanisms are discussed; In the propagation part, the observations and modelings of EIT waves/dimmings, as the EUV counterparts of CMEs, are described.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:48:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Chen", "P. F.", "" ] ]
[ 0.0485056192, 0.1015557423, 0.1149110198, 0.0468362086, 0.0141204214, 0.2092326581, 0.0393238664, 0.0674719661, 0.0002507012, 0.0066196723, -0.0086484682, 0.0201488454, -0.0771638155, -0.0296783913, 0.0722019598, 0.0484128743, 0.0127872126, 0.026455503, 0.0329708382, 0.1082333773, -0.0254121218, -0.0534674749, 0.0436133221, 0.040204946, -0.1527509689, -0.1197337583, -0.0728048012, 0.0837487057, 0.0279162358, -0.0025055634, 0.1390247047, -0.0140160834, -0.1374480426, -0.0264091305, -0.1185280755, 0.1525654793, -0.0704398081, 0.0034228691, -0.0643186346, 0.051427085, -0.0083644371, -0.0194996297, -0.0378631353, 0.0803171471, -0.1263186485, -0.1231653243, -0.0609798171, -0.0096628666, 0.0206125695, -0.0034982243, 0.0225254353, -0.0258062873, 0.0979386866, -0.0528182611, -0.1181570888, -0.088896051, 0.0488765985, -0.012833585, -0.1315123737, -0.0889424235, -0.0432423428, -0.0654315799, -0.0772565603, -0.0582438409, 0.0165317915, -0.0261308961, 0.057130903, 0.0722947046, 0.0538384542, 0.0068863141, -0.0569917858, -0.0005713235, 0.0088629415, -0.000158228, 0.0200908799, 0.0081905406, -0.0131002273, -0.0449581258, -0.0296320189, 0.0502677746, 0.0561107062, 0.0856036097, -0.0912146792, -0.0766537189, -0.0568062961, -0.026687365, 0.0189779401, 0.0159289483, -0.0337591693, 0.0281712841, -0.0620463863, 0.0505460091, -0.0724338219, 0.0284495205, 0.0700688288, 0.0367270075, 0.0048517212, -0.027591629, 0.1217741445, 0.0759117603, -0.0399267115, -0.0176679175, -0.0834704712, -0.0733148977, 0.0771638155, -0.0205893833, -0.1162094474, -0.0649678484, 0.0056168674, 0.0106019098, 0.0243223682, 0.0517980643, -0.0650605932, 0.0201372523, 0.0166825019, -0.0355445109, 0.0122423358, -0.0530501232, -0.0890815407, 0.1020194665, -0.0450276844, 0.1306776702, 0.0100686261, 0.0114018349, 0.0399730839, -0.0387442112, -0.034176521, -0.0220964886, -0.0641331449, -0.0503605194, 0.1007210389, -0.0389065146, 0.0603306033, -0.0769783258, -0.0114308177, 0.049525816, 0.0378863215, -0.0081383707, 0.0079238983, 0.0329012796, 0.0392079353, 0.0489693433, 0.1014629975, 0.0301189292, 0.0776275396, -0.0292378515, -0.0091295829, 0.0382109284, 0.0174128674, -0.0686312765, -0.1036888734, -0.0581047237, 0.0783694983, -0.0137958145, 0.0339446589, -0.0242064372, 0.0746596977, -0.0352430902, -0.0210647006, -0.0724801943, 0.0466043465, -0.007889119, -0.0958055556, -0.0182939451, 0.0522617921, -0.0116221039, -0.0441466048, 0.0077500017, -0.0574091375, -0.0812445953, -0.0815228298, -0.1403231472, -0.1081406325, 0.0376080871, 0.0083876234, 0.0316724069, -0.0799461678, 0.001002805, -0.0390456319, 0.0246933475, 0.0258294735, 0.1000718251, -0.0105671305, -0.03338819, 0.0549513958, 0.0871802717, 0.0669618696, 0.1090680882, -0.0872730166, -0.066451773, -0.0246701613, 0.0276843738, -0.0238122717, 0.0294697136, -0.0197778642, -0.0269424133, 0.0425699428, -0.0236035958, 0.0186765175, -0.0100106606, 0.0551368855, 0.0537920818, -0.0039996267, 0.0240441337, 0.0063646236, -0.0046981126, 0.084119685, 0.061304424, -0.0266641788, 0.0524472818, 0.0910755619, 0.0387673974, 0.0875048786, 0.0556933545, -0.1278953105, -0.0392079353, -0.0498504229, 0.0853717476, 0.0687240213, -0.0131813791, -0.0014252294, -0.0296088327, 0.1412505955, 0.0795288086, 0.0870411545, 0.1074914187, -0.0065269275, -0.0443320945, 0.0292842239, 0.0181432348, -0.0240209475, 0.0314405449, 0.0089382967, -0.0367965661, -0.0427554324, 0.0266178064, 0.0889887959, 0.016114438, 0.0383964181, -0.0439843014, 0.0559715889, 0.0554614924, -0.0320433863, -0.0305130947, -0.0594958998, 0.0535138473, -0.0047821626, -0.0665445179, -0.051427085, -0.0532819852, 0.1764009297, 0.0577801168, 0.0007010216, 0.0079586776, 0.0618608966, -0.073454015 ]
712.3633
Hannes Jung
J. Bartels (Univ. Hamburg), K. Borras (DESY), M. Diehl (DESY) and H. Jung (DESY), H. Abramowicz, J. Albacete, L. Alvarez-Gaume, J. Alvarez-Muniz, R D. Ball, J. Bartels, K. Belov, J. Bluemer, J. Bluemlein, A. Bonato, M. Braun, P. Brogueira, G. C Trinchero, R. Conceicao, J-R. Cudell, J Dainton, A. De Roeck, M. Deile, J. Dias de Deus, R. Engel, M C. Espirito Santo, C. Ewerz, R. Fabbri, V. Fadin, P. Falgari, L. Fan\`o, E. Ferreira, J Forshaw, S. Forte, L. Frankfurt, H. G Dosch, C. Gomez, K. Golec-Biernat, S. Goloskokov, K. Goulianos, G. Gustafson, A. Hamilton, C E. Hyde, M. Islam, D. Ivanov, R. J Luddy, L. Jenkovsky, J. Kaspar, A. Kaidalov, O. Kepka, V. Khoze, M. Klein, B Z. Kopeliovich, A. Kovner, H. Kowalski, M. Kozlov, J. Kretzschmar, K. Kumericki, V. Kundrat, P. L Iafelice, P. Laycock, A. Lengyel, E. Levin, A. Levy, L. Lipatov, M. Lokajicek, J. Londergan, A. Luszczak, V L. Lyuboshitz, D. Mueller, A D. Martin, E. Martynov, S. Marzani, E. Meggiolaro, S. Munier, O. Nachtmann, T. Namsoo, P. Newman, B. Nicolescu, J. Nystrand, K. Passek-Kumericki, T. Pierog, A. Pilkington, M. Pimenta, B. Pire, B Povh, D. Roehrich, C. Royon, M G. Ryskin, A. Sabio Vera, M. Salvadore, C. Sbarra, F. Schuessler, R. Schicker, I. Schmidt, L. Schoeffel, F. Schwennsen, M. Segond, O V. Selyugin, M. Seymour, A. Shoshi, A. Stasto, M. Strikman, B. Surrow, A P. Szczepaniak, A. Szczurek, L. Szymanowski, M. Tasevsky, A. Tavanfar, M. Togawa, A. Tricomi, R. Ulrich, M. Unger, V. V Lyuboshitz, M A. Vazquez-Mozo, G P. Vacca, A. von Manteuffel, M I. Vyazovsky, S. Wallon, G. Watt, C. Weiss, K. Werner, B W. Xiao
12th International Conference on Elastic and Diffractive Scattering (Blois Workshop) - Forward Physics and QCD
Proceedings of the 12th International Conference on Elastic and Diffractive Scattering (Blois Workshop) - Forward Physics and QCD, 549 pages replaced to include list of conveners
null
null
DESY-PROC-2007-02
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Proceedings of the 12th International Conference on Elastic and Diffractive Scattering (Blois Workshop) - Forward Physics and QCD
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:51:07 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 16:18:23 GMT" } ]
2009-09-29T00:00:00
[ [ "Bartels", "J.", "", "Univ. Hamburg" ], [ "Borras", "K.", "", "DESY" ], [ "Diehl", "M.", "", "DESY" ], [ "Jung", "H.", "", "DESY" ], [ "Abramowicz", "H.", "", "Univ. Hamburg" ], [ "Albacete", "J.", "", "Univ. Hamburg" ], [ "Alvarez-Gaume", "L.", "", "Univ. Hamburg" ], [ "Alvarez-Muniz", "J.", "", "Univ. Hamburg" ], [ "Ball", "R D.", "", "Univ. Hamburg" ], [ "Bartels", "J.", "", "Univ. Hamburg" ], [ "Belov", "K.", "" ], [ "Bluemer", "J.", "" ], [ "Bluemlein", "J.", "" ], [ "Bonato", "A.", "" ], [ "Braun", "M.", "" ], [ "Brogueira", "P.", "" ], [ "Trinchero", "G. C", "" ], [ "Conceicao", "R.", "" ], [ "Cudell", "J-R.", "" ], [ "Dainton", "J", "" ], [ "De Roeck", "A.", "" ], [ "Deile", "M.", "" ], [ "de Deus", "J. Dias", "" ], [ "Engel", "R.", "" ], [ "Santo", "M C. Espirito", "" ], [ "Ewerz", "C.", "" ], [ "Fabbri", "R.", "" ], [ "Fadin", "V.", "" ], [ "Falgari", "P.", "" ], [ "Fanò", "L.", "" ], [ "Ferreira", "E.", "" ], [ "Forshaw", "J", "" ], [ "Forte", "S.", "" ], [ "Frankfurt", "L.", "" ], [ "Dosch", "H. G", "" ], [ "Gomez", "C.", "" ], [ "Golec-Biernat", "K.", "" ], [ "Goloskokov", "S.", "" ], [ "Goulianos", "K.", "" ], [ "Gustafson", "G.", "" ], [ "Hamilton", "A.", "" ], [ "Hyde", "C E.", "" ], [ "Islam", "M.", "" ], [ "Ivanov", "D.", "" ], [ "Luddy", "R. J", "" ], [ "Jenkovsky", "L.", "" ], [ "Kaspar", "J.", "" ], [ "Kaidalov", "A.", "" ], [ "Kepka", "O.", "" ], [ "Khoze", "V.", "" ], [ "Klein", "M.", "" ], [ "Kopeliovich", "B Z.", "" ], [ "Kovner", "A.", "" ], [ "Kowalski", "H.", "" ], [ "Kozlov", "M.", "" ], [ "Kretzschmar", "J.", "" ], [ "Kumericki", "K.", "" ], [ "Kundrat", "V.", "" ], [ "Iafelice", "P. L", "" ], [ "Laycock", "P.", "" ], [ "Lengyel", "A.", "" ], [ "Levin", "E.", "" ], [ "Levy", "A.", "" ], [ "Lipatov", "L.", "" ], [ "Lokajicek", "M.", "" ], [ "Londergan", "J.", "" ], [ "Luszczak", "A.", "" ], [ "Lyuboshitz", "V L.", "" ], [ "Mueller", "D.", "" ], [ "Martin", "A D.", "" ], [ "Martynov", "E.", "" ], [ "Marzani", "S.", "" ], [ "Meggiolaro", "E.", "" ], [ "Munier", "S.", "" ], [ "Nachtmann", "O.", "" ], [ "Namsoo", "T.", "" ], [ "Newman", "P.", "" ], [ "Nicolescu", "B.", "" ], [ "Nystrand", "J.", "" ], [ "Passek-Kumericki", "K.", "" ], [ "Pierog", "T.", "" ], [ "Pilkington", "A.", "" ], [ "Pimenta", "M.", "" ], [ "Pire", "B.", "" ], [ "Povh", "B", "" ], [ "Roehrich", "D.", "" ], [ "Royon", "C.", "" ], [ "Ryskin", "M G.", "" ], [ "Vera", "A. Sabio", "" ], [ "Salvadore", "M.", "" ], [ "Sbarra", "C.", "" ], [ "Schuessler", "F.", "" ], [ "Schicker", "R.", "" ], [ "Schmidt", "I.", "" ], [ "Schoeffel", "L.", "" ], [ "Schwennsen", "F.", "" ], [ "Segond", "M.", "" ], [ "Selyugin", "O V.", "" ], [ "Seymour", "M.", "" ], [ "Shoshi", "A.", "" ], [ "Stasto", "A.", "" ], [ "Strikman", "M.", "" ], [ "Surrow", "B.", "" ], [ "Szczepaniak", "A P.", "" ], [ "Szczurek", "A.", "" ], [ "Szymanowski", "L.", "" ], [ "Tasevsky", "M.", "" ], [ "Tavanfar", "A.", "" ], [ "Togawa", "M.", "" ], [ "Tricomi", "A.", "" ], [ "Ulrich", "R.", "" ], [ "Unger", "M.", "" ], [ "Lyuboshitz", "V. V", "" ], [ "Vazquez-Mozo", "M A.", "" ], [ "Vacca", "G P.", "" ], [ "von Manteuffel", "A.", "" ], [ "Vyazovsky", "M I.", "" ], [ "Wallon", "S.", "" ], [ "Watt", "G.", "" ], [ "Weiss", "C.", "" ], [ "Werner", "K.", "" ], [ "Xiao", "B W.", "" ] ]
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712.3634
Simon Gustavsson
S. Gustavsson, I. Shorubalko, R. Leturcq, S. Sch\"on, K. Ensslin
Measuring current by counting electrons in a nanowire quantum dot
null
Appl. Phys. Lett. 92, 152101 (2008)
10.1063/1.2892679
null
cond-mat.mes-hall
null
We measure current by counting single electrons tunneling through an InAs nanowire quantum dot. The charge detector is realized by fabricating a quantum point contact in close vicinity to the nanowire. The results based on electron counting compare well to a direct measurements of the quantum dot current, when taking the finite bandwidth of the detector into account. The ability to detect single electrons also opens up possibilities for manipulating and detecting individual spins in nanowire quantum dots.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:51:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Gustavsson", "S.", "" ], [ "Shorubalko", "I.", "" ], [ "Leturcq", "R.", "" ], [ "Schön", "S.", "" ], [ "Ensslin", "K.", "" ] ]
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712.3635
Rainer Avikainen
Rainer Avikainen
Convergence Rates for Approximations of Functionals of SDEs
30 pages
null
null
null
math.PR
null
We consider upper bounds for the approximation error E|g(X)-g(\hat X)|^p, where X and \hat X are random variables such that \hat X is an approximation of X in the L_p-norm, and the function g belongs to certain function classes, which contain e.g. functions of bounded variation. We apply the results to the approximations of a solution of a stochastic differential equation at time T by the Euler and Milstein schemes. For the Euler scheme we provide also a lower bound.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:51:40 GMT" } ]
2007-12-24T00:00:00
[ [ "Avikainen", "Rainer", "" ] ]
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712.3636
Francois Hild
Olivier Arnould (LMT), Fran\c{c}ois Hild (LMT)
On the measurement by EDX of diffusion profiles of Ni/Cu assemblies
null
Microscopy and Analysis European Edition (2000) 13-15
null
null
physics.class-ph
null
To characterise (inter)diffusion in materials, concentration profiles can be measured by EDX. It allows one to determine the chemical composition with a very good accuracy if measurement artefacts are accounted for. Standard phenomena (such as X-ray fluorescence) are usually corrected by commercial software. However, the effect of the pear-shaped volume of X-ray emission on the concentration profiles has to be considered. The paper describes the origin of this artefact, its consequences on measurements and will provide a practical solution (based on signal processing methods) to deconvolute the actual concentration profiles (or the diffusion coefficient) from the raw measurements.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:55:26 GMT" } ]
2007-12-24T00:00:00
[ [ "Arnould", "Olivier", "", "LMT" ], [ "Hild", "François", "", "LMT" ] ]
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712.3637
Toshiyuki Miyauchi
Norio Iwase, Kai Kikuchi and Toshiyuki Miyauchi
On Lusternik-Schnirelmann category of SO(10)
28 pages, 4 figures
null
null
null
math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $G$ be a compact connected Lie group and $p : E\to \Sigma A$ be a principal G-bundle with a characteristic map $\alpha : A\to G$, where $A=\Sigma A_{0}$ for some $A_{0}$. Let $\{K_{i}{\to} F_{i-1}{\hookrightarrow} F_{i} \,|\, 1{\le} i {\le} n,\, F_{0}{=} \{\ast\} \; F_{1}{=} \Sigma{K_{1}} \; \text{and}\; F_{n}{\simeq} G \}$ be a cone-decomposition of $G$ of length $m$ and $F'_{1}=\Sigma{K'_{1}} \subset F_{1}$ with $K'_{1} \subset K_{1}$ which satisfy $F_{i}F'_{1} \subset F_{i+1}$ up to homotopy for any $i$. Our main result is as follows: we have $\operatorname{cat}(X) \le m{+}1$, if firstly the characteristic map $\alpha$ is compressible into $F'_{1}$, secondly the Berstein-Hilton Hopf invariant $H_{1}(\alpha)$ vanishes in $[A, \Omega F'_1{\ast}\Omega F'_1]$ and thirdly $K_{m}$ is a sphere. We apply this to the principal bundle $\mathrm{SO}(9)\hookrightarrow\mathrm{SO}(10)\to S^{9}$ to determine L-S category of $\mathrm{SO}(10)$.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:56:11 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2012 13:13:38 GMT" }, { "version": "v3", "created": "Wed, 30 Oct 2013 02:08:11 GMT" } ]
2015-03-13T00:00:00
[ [ "Iwase", "Norio", "" ], [ "Kikuchi", "Kai", "" ], [ "Miyauchi", "Toshiyuki", "" ] ]
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712.3638
Jean-Baptiste Gouere
Jean-Baptiste Gou\'er\'e (MAPMO)
Subcritical regimes in some models of continuum percolation
Published in at http://dx.doi.org/10.1214/08-AAP575 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
null
null
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider some continuum percolation models. We are mainly interested in giving some sufficient conditions for absence of percolation. We give some general conditions and then focuse on two examples. The first one is a multiscale percolation model based on the Boolean model. It was introduced by Meester and Roy and subsequently studied by Menshikov, Popov and Vachkovskaia. The second one is based on the stable marriage of Poisson and Lebesgue introduced by Hoffman, Holroyd and Peres and whose percolation properties have been studied by Freire, Popov and Vachkovskaia.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 07:57:39 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 16:55:43 GMT" }, { "version": "v3", "created": "Mon, 28 Sep 2009 06:48:19 GMT" } ]
2009-09-28T00:00:00
[ [ "Gouéré", "Jean-Baptiste", "", "MAPMO" ] ]
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712.3639
Jean-Sebastien Lauret
G. Magadur (LPQM, PPSM), Jean-S\'ebastien Lauret (LPQM), V. Alain-Rizzo (PPSM), C. Voisin (LPA), Ph. Roussignol (LPA), E. Deleporte (LPQM), J.A. Delaire (PPSM)
Excitation transfer and luminescence in porphyrin-carbon nanotube complexes
null
null
null
null
physics.optics
null
Functionalization of carbon nanotubes with hydrosoluble porphyrins (TPPS) is achieved by "$\pi$-stacking". The porphyrin/nanotube interaction is studied by means of optical absorption, photoluminescence and photoluminescence excitation spectroscopies. The main absorption line of the porphyrins adsorbed on nanotubes exhibits a 120 meV red shift, which we ascribe to a flattening of the molecule in order to optimize $\pi-\pi$ interactions. The porphyrin-nanotube complex shows a strong quenching of the TPPS emission while the photoluminescence intensity of the nanotubes is enhanced when the excitation laser is in resonance with the porphyrin absorption band. This reveals an efficient excitation transfer from the TPPS to the carbon nanotube.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 08:02:46 GMT" } ]
2007-12-24T00:00:00
[ [ "Magadur", "G.", "", "LPQM, PPSM" ], [ "Lauret", "Jean-Sébastien", "", "LPQM" ], [ "Alain-Rizzo", "V.", "", "PPSM" ], [ "Voisin", "C.", "", "LPA" ], [ "Roussignol", "Ph.", "", "LPA" ], [ "Deleporte", "E.", "", "LPQM" ], [ "Delaire", "J. A.", "", "PPSM" ] ]
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712.364
Dmitriy Moskovkin
D.L. Moskovkin, V.M. Shabaev, and W. Quint
Zeeman effect of the hyperfine structure levels in lithiumlike ions
25 pages, 5 figures
Phys. Rev. A 77, 063421 (2008)
10.1103/PhysRevA.77.063421
null
physics.atom-ph physics.optics
null
The fully relativistic theory of the Zeeman splitting of the $(1s)^2 2s$ hyperfine-structure levels in lithiumlike ions with $Z=6 - 32$ is considered for the magnetic field magnitude in the range from 1 to 10 T. The second-order corrections to the Breit -- Rabi formula are calculated and discussed including the one-electron contributions as well as the interelectronic-interaction effects of order 1/Z. The 1/Z corrections are evaluated within a rigorous QED approach. These corrections are combined with other interelectronic-interaction, QED, nuclear recoil, and nuclear size corrections to obtain high-precision theoretical values for the Zeeman splitting in Li-like ions with nonzero nuclear spin. The results can be used for a precise determination of nuclear magnetic moments from $g$-factor experiments.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 08:13:19 GMT" } ]
2009-04-08T00:00:00
[ [ "Moskovkin", "D. L.", "" ], [ "Shabaev", "V. M.", "" ], [ "Quint", "W.", "" ] ]
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712.3641
Dawei Ding
Dawei Ding, Jie Zhu, Xiaoshu Luo, Yuliang Liu
Controlling Delay-induced Hopf bifurcation in Internet congestion control system
20 pages, 8 figures
null
null
null
cs.NI
null
This paper focuses on Hopf bifurcation control in a dual model of Internet congestion control algorithms which is modeled as a delay differential equation (DDE). By choosing communication delay as a bifurcation parameter, it has been demonstrated that the system loses stability and a Hopf bifurcation occurs when communication delay passes through a critical value. Therefore, a time-delayed feedback control method is applied to the system for delaying the onset of undesirable Hopf bifurcation. Theoretical analysis and numerical simulations confirm that the delayed feedback controller is efficient in controlling Hopf bifurcation in Internet congestion control system. Moreover, the direction of the Hopf bifurcation and the stability of the bifurcating periodic solutions are determinated by applying the center manifold theorem and the normal form theory.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 08:30:23 GMT" } ]
2007-12-24T00:00:00
[ [ "Ding", "Dawei", "" ], [ "Zhu", "Jie", "" ], [ "Luo", "Xiaoshu", "" ], [ "Liu", "Yuliang", "" ] ]
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712.3642
Fang Xia
Fang Xia, Shulin Ren and Yanning Fu
The Empirical Mass-Luminosity Relation for Low Mass Stars
8 pages, 2 figures. Accepted for publication in Astrophysics & Space Science
Astrophys.SpaceSci.314:51-58,2008
10.1007/s10509-007-9729-8
null
astro-ph
null
This work is devoted to improving empirical mass-luminosity relations and mass-metallicity-luminosity relation for low mass stars. For these stars, observational data in the mass-luminosity plane or the mass-metallicity-luminosity space subject to non-negligible errors in all coordinates with different dimensions. Thus a reasonable weight assigning scheme is needed for obtaining more reliable results. Such a scheme is developed, with which each data point can have its own due contribution. Previous studies have shown that there exists a plateau feature in the mass-luminosity relation. Taking into account the constraints from the observational luminosity function, we find by fitting the observational data using our weight assigning scheme that the plateau spans from 0.28 to 0.50 solar mass. Three-piecewise continuous improved mass-luminosity relations in K, J, H and V bands, respectively, are obtained. The visual mass-metallicity-luminosity relation is also improved based on our K band mass-luminosity relation and the available observational metallicity data.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 08:48:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Xia", "Fang", "" ], [ "Ren", "Shulin", "" ], [ "Fu", "Yanning", "" ] ]
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712.3643
Shih-Yuin Lin
B. L. Hu and Shih-Yuin Lin
Black Hole Information in a Detector (Atom) - Field Analog
13 pages, 4 figures; Invited plenary talk at the workshop ``From Quantum to Emergent Gravity: Theory and Phenomenology", Trieste, Italy, June 11-15, 2007
PoS QG-Ph:019,2007
null
null
gr-qc
null
This is a synopsis of our recent work on quantum entanglement, recoherence and information flow between an uniformly accelerated detector and a massless quantum scalar field. The availability of exact solutions to this model enables us to explore the black hole information issue with some quantifiable results and new insights. To the extent this model can be used as an analog to the system of a black hole interacting with a quantum field, our result seems to suggest in the prevalent non-Markovian regime, assuming unitarity for the combined system, that black hole information is not lost but transferred to the quantum field degrees of freedom. This combined system will evolve into a highly entangled state between a remnant of large area (in Bekenstein's black hole atom analog) without any information of its initial state, while the quantum field is imbued with complex information content not-so-easily retrievable by a local observer.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:09:46 GMT" } ]
2009-12-15T00:00:00
[ [ "Hu", "B. L.", "" ], [ "Lin", "Shih-Yuin", "" ] ]
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712.3644
Jerome Margueron
J. Margueron (IPNO), H. Sagawa, K. Hagino
Effective pairing interactions with isospin density dependence
null
Phys.Rev.C77:054309,2008
10.1103/PhysRevC.77.054309
null
nucl-th
null
We perform Hartree-Fock-Bogoliubov (HFB) calculations for semi-magic Calcium, Nickel, Tin and Lead isotopes and $N$=20, 28, 50 and 82 isotones using density-dependent pairing interactions recently derived from a microscopic nucleon-nucleon interaction. These interactions have an isovector component so that the pairing gaps in symmetric and neutron matter are reproduced. Our calculations well account for the experimental data for the neutron number dependence of binding energy, two neutrons separation energy, and odd-even mass staggering of these isotopes. This result suggests that by introducing the isovector term in the pairing interaction, one can construct a global effective pairing interaction which is applicable to nuclei in a wide range of the nuclear chart. It is also shown with the local density approximation (LDA) that the pairing field deduced from the pairing gaps in infinite matter reproduces qualitatively well the pairing field for finite nuclei obtained with the HFB method.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:12:03 GMT" }, { "version": "v2", "created": "Sun, 23 Mar 2008 20:25:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Margueron", "J.", "", "IPNO" ], [ "Sagawa", "H.", "" ], [ "Hagino", "K.", "" ] ]
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712.3645
Dmitry Nuzhnyy
S.Kamba, D.Nuzhnyy, R.Nechache, K.Zaveta, D.Niznansky, E.Santava, C.Harnagea, A.Pignolet
Infrared and magnetic characterization of the multiferroic Bi2FeCrO6 thin films in a broad temperature range
subm. to PRB
Phys. Rev. B 77, 104111 (2008)
10.1103/PhysRevB.77.104111
null
cond-mat.mtrl-sci
null
Infrared reflectance spectra of an epitaxial Bi2FeCrO6 thin film prepared by pulsed laser deposition on LaAlO3 substrate were recorded between 10 and 900 K. No evidence for a phase transition to the paraelectric phase was observed, but some phonon anomalies were revealed near 600 K. Most of the polar modes exhibit only a gradual softening, which results in a continuous increase of the static permittivity on heating. It indicates that the ferroelectric phase transition should occur somewhere above 900 K. Magnetic measurements performed up to 1000 K, revealed a possible magnetic phase transition between 600 and 800 K, but the exact critical temperature cannot be determined due to a strong diamagnetic signal from the substrate. Nevertheless, our experimental data show that the B-site ordered Bi2FeCrO6 is one of the rare high-temperature multiferroics.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:18:11 GMT" } ]
2009-01-06T00:00:00
[ [ "Kamba", "S.", "" ], [ "Nuzhnyy", "D.", "" ], [ "Nechache", "R.", "" ], [ "Zaveta", "K.", "" ], [ "Niznansky", "D.", "" ], [ "Santava", "E.", "" ], [ "Harnagea", "C.", "" ], [ "Pignolet", "A.", "" ] ]
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712.3646
Ali Naji
Yevgeni Sh. Mamasakhlisov, Ali Naji, Rudolf Podgornik
Partially Annealed Disorder and Collapse of Like-Charged Macroions
21 pages, 2 figures
J. Stat. Phys. 133, 659 (2008)
10.1007/s10955-008-9635-7
null
cond-mat.soft cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Charged systems with partially annealed charge disorder are investigated using field-theoretic and replica methods. Charge disorder is assumed to be confined to macroion surfaces surrounded by a cloud of mobile neutralizing counterions in an aqueous solvent. A general formalism is developed by assuming that the disorder is partially annealed (with purely annealed and purely quenched disorder included as special cases), i.e., we assume in general that the disorder undergoes a slow dynamics relative to fast-relaxing counterions making it possible thus to study the stationary-state properties of the system using methods similar to those available in equilibrium statistical mechanics. By focusing on the specific case of two planar surfaces of equal mean surface charge and disorder variance, it is shown that partial annealing of the quenched disorder leads to renormalization of the mean surface charge density and thus a reduction of the inter-plate repulsion on the mean-field or weak-coupling level. In the strong-coupling limit, charge disorder induces a long-range attraction resulting in a continuous disorder-driven collapse transition for the two surfaces as the disorder variance exceeds a threshold value. Disorder annealing further enhances the attraction and, in the limit of low screening, leads to a global attractive instability in the system.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:25:22 GMT" }, { "version": "v2", "created": "Sat, 23 May 2009 22:21:45 GMT" } ]
2009-05-24T00:00:00
[ [ "Mamasakhlisov", "Yevgeni Sh.", "" ], [ "Naji", "Ali", "" ], [ "Podgornik", "Rudolf", "" ] ]
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712.3647
Nicola Visciglia
Scipio Cuccagna, Nicola Visciglia
Strichartz estimates for Schroedinger equations with periodic potential in 1D
This paper has been withdrawn
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper has been withdrawn by the author due to a crucial error in the Proof of Theorem 0.3
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:26:39 GMT" }, { "version": "v2", "created": "Mon, 9 Jun 2008 11:48:37 GMT" } ]
2008-06-09T00:00:00
[ [ "Cuccagna", "Scipio", "" ], [ "Visciglia", "Nicola", "" ] ]
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712.3648
Nicola Visciglia
Luis Vega, Nicola Visciglia
Asymptotic Lower Bounds for a class of Schroedinger Equations
24 pages. to appear on Comm. Math. Phys
null
10.1007/s00220-008-0432-6
null
math.AP
null
We shall study the following initial value problem: \begin{equation}{\bf i}\partial_t u - \Delta u + V(x) u=0, \hbox{} (t, x) \in {\mathbf R} \times {\mathbf R}^n, \end{equation} $$u(0)=f,$$ where $V(x)$ is a real short--range potential, whose radial derivative satisfies some supplementary assumptions. More precisely we shall present a family of identities satisfied by the solutions to the previous Cauchy problem. As a by--product of these identities we deduce some uniqueness results and a lower bound for the so called local smoothing which becomes an identity in a precise asymptotic sense.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:35:00 GMT" } ]
2009-11-13T00:00:00
[ [ "Vega", "Luis", "" ], [ "Visciglia", "Nicola", "" ] ]
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712.3649
Gilles Schaeffer
Guillaume Chapuy, Michel Marcus and Gilles Schaeffer
A bijection for rooted maps on orientable surfaces
27 pages ; We correct an inaccuracy in the proof of Lemma 8
SIAM Journal on Discrete Mathematics, 23(3):1587-1611 (2009)
null
null
math.CO
null
The enumeration of maps and the study of uniform random maps have been classical topics of combinatorics and statistical physics ever since the seminal work of Tutte in the sixties. Following the bijective approach initiated by Cori and Vauquelin in the eighties, we describe a bijection between rooted maps, or rooted bipartite quadrangulations, on a surface of genus g and some simpler objects that generalize plane trees. Thanks to a rerooting argument, our bijection allows to compute the generating series of rooted maps on a surface of genus g with respect to the number of edges, and to recover the asymptotic numbers of such maps. Our construction allows to keep track in a bipartite quadrangulation of the distances of all vertices to a random basepoint. This is an analog for higher genus surfaces of the basic result on which were built the recent advances in the comprehension of the intrinsec geometry of large random planar maps, hopefully opening the way to the study of a model of continuum random surfaces of genus g.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:49:11 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 16:55:06 GMT" } ]
2010-06-29T00:00:00
[ [ "Chapuy", "Guillaume", "" ], [ "Marcus", "Michel", "" ], [ "Schaeffer", "Gilles", "" ] ]
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712.365
Anne Fey-den Boer
Anne Fey, Remco van der Hofstad, Marten Klok
Large deviations for eigenvalues of sample covariance matrices, with applications to mobile communication systems
corrected some typing errors, and extended Theorem 3.1 to Wishart matrices; to appear in Advances of Applied Probability
Advances in Applied Probability 40 nr. 4 (2008), 1048-1071
10.1239/aap/1231340164
null
math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study sample covariance matrices of the form $W=\frac 1n C C^T$, where $C$ is a $k\times n$ matrix with i.i.d. mean zero entries. This is a generalization of so-called Wishart matrices, where the entries of $C$ are independent and identically distributed standard normal random variables. Such matrices arise in statistics as sample covariance matrices, and the high-dimensional case, when $k$ is large, arises in the analysis of DNA experiments. We investigate the large deviation properties of the largest and smallest eigenvalues of $W$ when either $k$ is fixed and $n\to \infty$, or $k_n\to \infty$ with $k_n=o(n/\log\log{n})$, in the case where the squares of the i.i.d. entries have finite exponential moments. Previous results, proving a.s. limits of the eigenvalues, only require finite fourth moments. Our most explicit results for $k$ large are for the case where the entries of $C$ are $\pm1$ with equal probability. We relate the large deviation rate functions of the smallest and largest eigenvalue to the rate functions for independent and identically distributed standard normal entries of $C$. This case is of particular interest, since it is related to the problem of the decoding of a signal in a code division multiple access system arising in mobile communication systems. In this example, $k$ plays the role of the number of users in the system, and $n$ is the length of the coding sequence of each of the users. Each user transmits at the same time and uses the same frequency, and the codes are used to distinguish the signals of the separate users. The results imply large deviation bounds for the probability of a bit error due to the interference of the various users.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:40:49 GMT" }, { "version": "v2", "created": "Fri, 14 Nov 2008 14:11:30 GMT" } ]
2009-01-29T00:00:00
[ [ "Fey", "Anne", "" ], [ "van der Hofstad", "Remco", "" ], [ "Klok", "Marten", "" ] ]
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712.3651
Xavier Moya
Lluis Manosa, Xavier Moya, Antoni Planes, Oliver Gutfleisch, Julia Lyubina, Maria Barrio, Josep-Lluis Tamarit, Seda Aksoy, Thorsten Krenke, Mehmet Acet
Effects of hydrostatic pressure on the magnetism and martensitic transition of Ni-Mn-In magnetic superelastic alloys
3 pages, 3 figures. Accepted for publication in Applied Physics Letters
null
10.1063/1.2830999
null
cond-mat.mtrl-sci
null
We report magnetization and differential thermal analysis measurements as a function of pressure accross the martensitic transition in magnetically superelastic Ni-Mn-In alloys. It is found that the properties of the martensitic transformation are significantly affected by the application of pressure. All transition temperatures shift to higher values with increasing pressure. The largest rate of temperature shift with pressure has been found for Ni$_{50}$Mn$_{34}$In$_{16}$ as a consequence of its small entropy change at the transition. Such a strong pressure dependence of the transition temperature opens up the possibility of inducing the martensitic transition by applying relatively low hydrostatic pressures.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:42:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Manosa", "Lluis", "" ], [ "Moya", "Xavier", "" ], [ "Planes", "Antoni", "" ], [ "Gutfleisch", "Oliver", "" ], [ "Lyubina", "Julia", "" ], [ "Barrio", "Maria", "" ], [ "Tamarit", "Josep-Lluis", "" ], [ "Aksoy", "Seda", "" ], [ "Krenke", "Thorsten", "" ], [ "Acet", "Mehmet", "" ] ]
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712.3652
Simone Piccinin
Simone Piccinin, Catherine Stampfl, Matthias Scheffler
First-principles investigation of Ag-Cu alloy surfaces in an oxidizing environment
10 pages, 6 figures
null
10.1103/PhysRevB.77.075426
null
cond-mat.mtrl-sci
null
In this paper we investigate by means of first-principles density functional theory calculations the (111) surface of the Ag-Cu alloy under varying conditions of pressure of the surrounding oxygen atmosphere and temperature. This alloy has been recently proposed as a catalyst with improved selectivity for ethylene epoxidation with respect to pure silver, the catalyst commonly used in industrial applications. Here we show that the presence of oxygen leads to copper segregation to the surface. Considering the surface free energy as a function of the surface composition, we construct the convex hull to investigate the stability of various surface structures. By including the dependence of the free surface energy on the oxygen chemical potential, we are able compute the phase diagram of the alloy as a function of temperature, pressure and surface composition. We find that, at temperature and pressure typically used in ethylene epoxidation, a number of structures can be present on the surface of the alloy, including clean Ag(111), thin layers of copper oxide and thick oxide-like structures. These results are consistent with, and help explain, recent experimental results.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:44:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Piccinin", "Simone", "" ], [ "Stampfl", "Catherine", "" ], [ "Scheffler", "Matthias", "" ] ]
[ 0.0962648615, -0.0710576922, -0.0182287656, 0.0229517929, 0.0472302809, 0.0353696421, 0.0567824692, 0.0071376096, -0.0139966132, -0.0660693198, 0.1284238994, -0.1158999205, 0.0005219709, -0.0282054991, -0.0037512251, 0.0948851034, 0.0482120328, 0.010686514, -0.0766298026, -0.0093531869, 0.0647426322, -0.1014655009, -0.0274094827, 0.0092138844, -0.0365105979, -0.1119729057, 0.1086296439, -0.0858105198, 0.0435951389, -0.0467261374, 0.1243907586, -0.0671306774, -0.0566232689, -0.0068258368, -0.0729681253, -0.0009444397, 0.0326101184, 0.0617708378, -0.0958933905, -0.0374658182, 0.0470180064, -0.0213464946, -0.0144211557, 0.0779034272, -0.0294525903, -0.0224476494, -0.0325835869, 0.0338837467, 0.0244642235, 0.0137445414, -0.0403314754, 0.0214924309, 0.1007756144, -0.137020871, -0.075250037, -0.07503777, -0.075356178, 0.0899498016, 0.0570478104, -0.0386333056, -0.0083979685, -0.1154753789, 0.0248622317, 0.0663346648, -0.1156876534, 0.0056351293, -0.0558803193, 0.0530411936, 0.0566232689, 0.0030513944, 0.0298240632, -0.0309119523, -0.0187859759, -0.040756017, 0.0089883469, -0.1391435862, -0.0347062945, 0.0271441434, -0.0594889261, 0.0135521712, -0.074878566, -0.0654325113, 0.0134526696, -0.0241723508, -0.0147528285, -0.0379964933, 0.0489284471, -0.0164244622, -0.0802384093, -0.030115936, -0.0385006368, -0.00315753, -0.0463546626, -0.0195554588, 0.0731273293, 0.0682981685, 0.0344940238, -0.0700494051, 0.0102420719, 0.0222884472, -0.0243050195, -0.0517941043, 0.0926562548, 0.0074891835, 0.0644772947, 0.0142088849, 0.0277013555, -0.04792016, -0.0317610353, 0.04752215, 0.1334122717, -0.0200861357, -0.055243507, 0.0918602422, -0.0550312363, 0.013154163, -0.0572070107, 0.0655386448, -0.0799730718, 0.0732865334, -0.1406294852, 0.0079535255, -0.0481324308, 0.0368820727, 0.0699963346, -0.0437012762, 0.1348981708, -0.1149447039, -0.0394558571, -0.0869249403, -0.0156815145, -0.0492999218, -0.0572070107, 0.0283647012, -0.0220231079, -0.0191972516, 0.1182349026, -0.0205637459, 0.0421357788, -0.0616116337, 0.0921255797, -0.0093001192, 0.0268788058, 0.075409241, -0.0002947747, 0.0419765748, -0.0153763741, 0.0775319561, -0.0242519528, 0.0179501586, -0.0652202368, -0.00349252, 0.0513430275, -0.0080795614, 0.0608156174, -0.1066130698, 0.0326631889, 0.076046057, 0.0240662154, -0.123647809, 0.1247091666, 0.028125897, -0.1373392791, -0.024079483, 0.0395885259, 0.0309384856, -0.0656447783, -0.0419765748, -0.034440957, 0.0303812753, -0.0004461006, -0.1190839857, -0.0930807963, 0.1321386397, -0.0071774102, -0.0821488425, -0.0051110857, -0.0088755777, -0.0452402383, 0.0397477299, 0.0436747409, -0.0362452604, -0.0173664149, -0.0804506764, -0.0535188057, 0.0151508367, 0.0775850192, 0.0852798447, -0.0690941811, 0.0786463767, -0.1006164178, 0.0716414377, 0.0251143035, -0.0138639444, -0.1156876534, -0.0905866176, 0.0843246207, 0.0354227088, -0.0083316332, 0.1266196072, 0.0706331506, 0.0215454977, 0.0409417525, 0.033963345, -0.0109916534, -0.0520594418, -0.0065439143, -0.0801853389, -0.0060663046, -0.0325835869, 0.061240159, -0.0347593613, 0.0080662947, 0.1004041433, 0.0355288461, -0.0241458174, -0.0085571716, -0.075196974, 0.0577376895, 0.0877209529, -0.1300159395, 0.0035887051, 0.0875086859, 0.0708984882, 0.0544474907, 0.0790178478, 0.0260960553, -0.0232038647, -0.0075157173, -0.0414724313, -0.0216781683, 0.030115936, -0.0521390438, 0.0226068534, 0.0307262149, -0.0092603192, 0.0284443032, 0.0654325113, -0.1013062969, 0.0199667327, -0.1714087725, -0.0570478104, -0.0044278386, 0.019993268, 0.0319467746, 0.027038008, -0.1000326723, -0.0460893214, 0.0270512756, 0.1172796786, -0.0324243829, -0.0214128289, 0.0919663757, -0.0197013952, -0.1016777679, -0.0729150623 ]
712.3653
Naile Liu
Nai-Le Liu, Li Li, Sixia Yu, Zeng-Bing Chen
Duality relation and joint measurement in a Mach-Zehnder Interferometer
6 pages, 2 figures, title changed, presentation improved, appendix added, references updated, final version as published in PRA
Phys. Rev. A 79, 052108 (2009)
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Mach-Zehnder interferometric setup quantitatively characterizing the wave-particle duality implements in fact a joint measurement of two unsharp observables. We present a necessary and sufficient condition for such a pair of unsharp observables to be jointly measurable. The condition is shown to be equivalent to a duality inequality, which for the optimal strategy of extracting the which-path information is more stringent than the Jaeger-Shimony-Vaidman-Englert inequality.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 09:53:32 GMT" }, { "version": "v2", "created": "Thu, 22 May 2008 15:45:28 GMT" }, { "version": "v3", "created": "Tue, 12 May 2009 16:09:38 GMT" } ]
2009-05-12T00:00:00
[ [ "Liu", "Nai-Le", "" ], [ "Li", "Li", "" ], [ "Yu", "Sixia", "" ], [ "Chen", "Zeng-Bing", "" ] ]
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712.3654
Alejandro Chinea Manrique De Lara
Alejandro Chinea Manrique De Lara, Juan Manuel Moreno, Arostegui Jordi Madrenas, Joan Cabestany
Improving the Performance of PieceWise Linear Separation Incremental Algorithms for Practical Hardware Implementations
10 pages, 1 figure, 3 tables
Biological and Artificial Computation: From Neuroscience to Technology, J.Mira, R.Moreno-Diaz, J.Cabestany (eds.), pp. 607-616, Springer-Verlag, 1997
null
null
cs.NE cs.AI cs.LG
null
In this paper we shall review the common problems associated with Piecewise Linear Separation incremental algorithms. This kind of neural models yield poor performances when dealing with some classification problems, due to the evolving schemes used to construct the resulting networks. So as to avoid this undesirable behavior we shall propose a modification criterion. It is based upon the definition of a function which will provide information about the quality of the network growth process during the learning phase. This function is evaluated periodically as the network structure evolves, and will permit, as we shall show through exhaustive benchmarks, to considerably improve the performance(measured in terms of network complexity and generalization capabilities) offered by the networks generated by these incremental models.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:05:52 GMT" } ]
2007-12-24T00:00:00
[ [ "De Lara", "Alejandro Chinea Manrique", "" ], [ "Moreno", "Juan Manuel", "" ], [ "Madrenas", "Arostegui Jordi", "" ], [ "Cabestany", "Joan", "" ] ]
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712.3655
Rejish Nath g r
R. Nath, P. Pedri and L. Santos
Stability of dark solitons in three dimensional dipolar Bose-Einstein condensates
4 pages, 3 eps figures
Phys. Rev. Lett. 101, 210402 (2008)
10.1103/PhysRevLett.101.210402
null
cond-mat.other
null
The dynamical stability of dark solitons in dipolar Bose-Einstein condensates is studied. For standard short-range interacting condensates dark solitons are unstable against transverse excitations in two and three dimensions. On the contrary, due to its non local character, the dipolar interaction allows for stable 3D stationary dark solitons, opening a qualitatively novel scenario in nonlinear atom optics. We discuss in detail the conditions to achieve this stability, which demand the use of an additional optical lattice, and the stability regimes.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 20:52:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Nath", "R.", "" ], [ "Pedri", "P.", "" ], [ "Santos", "L.", "" ] ]
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712.3656
Anders Szepessy
Anders Szepessy
Langevin molecular dynamics derived from Ehrenfest dynamics
39 pages: modeling and analysis in separate sections. Formulation of initial data simplified
null
null
null
math-ph math.MP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Stochastic Langevin molecular dynamics for nuclei is derived from the Ehrenfest Hamiltonian system (also called quantum classical molecular dynamics) in a Kac-Zwanzig setting, with the initial data for the electrons stochastically perturbed from the ground state and the ratio, $M$, of nuclei and electron mass tending to infinity. The Ehrenfest nuclei dynamics is approximated by the Langevin dynamics with accuracy $o(M^{-1/2})$ on bounded time intervals and by $o(1)$ on unbounded time intervals, which makes the small $\mathcal{O}(M^{-1/2})$ friction and $o(M^{-1/2})$ diffusion terms visible. The initial electron probability distribution is a Gibbs density at low temperture, derived by a stability and consistency argument: starting with any equilibrium measure of the Ehrenfest Hamiltonian system, the initial electron distribution is sampled from the equilibrium measure conditioned on the nuclei positions, which after long time leads to the nuclei positions in a Gibbs distribution (i.e. asymptotic stability); by consistency the original equilibrium measure is then a Gibbs measure.The diffusion and friction coefficients in the Langevin equation satisfy the Einstein's fluctuation-dissipation relation.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:11:42 GMT" }, { "version": "v2", "created": "Sun, 5 Apr 2009 08:54:36 GMT" }, { "version": "v3", "created": "Sun, 2 Aug 2009 15:11:16 GMT" }, { "version": "v4", "created": "Mon, 6 Sep 2010 11:53:19 GMT" }, { "version": "v5", "created": "Wed, 30 Mar 2011 10:52:53 GMT" } ]
2011-03-31T00:00:00
[ [ "Szepessy", "Anders", "" ] ]
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712.3657
Giovanni Alessandrini
Giovanni Alessandrini, Edi Rosset
Symmetry of singular solutions of degenerate quasilinear elliptic equations
8 pages, to appear on Rendiconti dell'Istituto di Matematica dell'Universita' di Trieste
Rend. Istit. Mat. Univ. Trieste 39 (2007)
null
null
math.AP
null
We prove radial symmetry of singular solutions to an overdetermined boundary value problem for a class of degenerate quasilinear elliptic equations.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:18:38 GMT" } ]
2010-11-09T00:00:00
[ [ "Alessandrini", "Giovanni", "" ], [ "Rosset", "Edi", "" ] ]
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712.3658
Sebastiano Pennisi
M.C. Carrisi, M.A. Mele, S. Pennisi
On a non approximated approach to Extended Thermodynamics for dense gases and macromolecular fluids
null
null
null
null
math-ph math.MP
null
Recently the 14 moments model of Extended Thermodynamics for dense gases and macromolecular fluids has been considered and an exact solution, of the restrictions imposed by the entropy principle and that of Galilean relativity, has been obtained through a non relativistic limit. Here we prove uniqueness of the above solution and exploit other pertinent conditions such us the convexity of the function $h'$ related to the entropy density, the problem of subsystems and the fact that the flux in the conservation law of mass must be the moment of order 1 in the conservation law of momentum. Also the solution of this last condition is here obtained without using expansions around equilibrium. The results present interesting aspects which were not suspected when only approximated solutions of this problem were known.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:19:25 GMT" } ]
2007-12-24T00:00:00
[ [ "Carrisi", "M. C.", "" ], [ "Mele", "M. A.", "" ], [ "Pennisi", "S.", "" ] ]
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712.3659
Krzysztof Sacha
Jakub S. Prauzner-Bechcicki, Krzysztof Sacha, Bruno Eckhardt, and Jakub Zakrzewski
Quantum model for double ionization of atoms in strong laser fields
14 pages, 16 figures, version accepted for publication in Phys. Rev. A
Phys. Rev. A 78, 013419 (2008)
10.1103/PhysRevA.78.013419
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss double ionization of atoms in strong laser pulses using a reduced dimensionality model. Following the insights obtained from an analysis of the classical mechanics of the process, we confine each electron to move along the lines that point towards the two-particle Stark saddle in the presence of a field. The resulting effective two dimensional model is similar to the aligned electron model, but it enables correlated escape of electrons with equal momenta, as observed experimentally. The time-dependent solution of the Schr\"odinger equation allows us to discuss in detail the time dynamics of the ionization process, the formation of electronic wave packets and the development of the momentum distribution of the outgoing electrons. In particular, we are able to identify the rescattering process, simultaneous direct double ionization during the same field cycle, as well as other double ionization processes. We also use the model to study the phase dependence of the ionization process.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:28:25 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 11:40:09 GMT" }, { "version": "v3", "created": "Thu, 10 Jul 2008 12:21:39 GMT" } ]
2008-08-06T00:00:00
[ [ "Prauzner-Bechcicki", "Jakub S.", "" ], [ "Sacha", "Krzysztof", "" ], [ "Eckhardt", "Bruno", "" ], [ "Zakrzewski", "Jakub", "" ] ]
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712.366
Matej Pavsic
Matej Pavsic
Towards a New Paradigm: Relativity in Configuration Space
15 pages; Presented at "Time and Matter 2007", 26-31 August 2007, Bled, Slovenia
null
null
null
gr-qc
null
We consider the possibility that the basic space of physics is not spacetime, but configuration space. We illustrate this on the example with a system of gravitationally interacting point particles. It turns out that such system can be described by the minimal length action in a multidimensional configuration space C with a block diagonal metric. Allowing for more general metrics and curvatures of C, we step beyond the ordinary general relativity in spacetime. The latter theory is then an approximation to the general relativity in C. Other sorts of configuration spaces can also be considered, for instance those associated with extended objects, such as strings and branes. This enables a deeper understanding of the geometric principle behind string theory, and an insight on the occurrence of Yang-Mills and gravitational fields at the `fundamental level'.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 12:54:18 GMT" } ]
2007-12-24T00:00:00
[ [ "Pavsic", "Matej", "" ] ]
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712.3661
R\'emi Huguet
R. Huguet, J.C. Caillon and J. Labarsouque
A nuclear matter description based on quark structure of the nucleon and pion exchange
Revised Version, 30 pages, 9 figures, 4 tables, Accepted for publication in Nuclear Physics A
Nucl.Phys.A809:189-210,2008
10.1016/j.nuclphysa.2008.06.002
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the possibility to describe nuclear matter in an approach constrained by the prominent features of quantum chromodynamics. We mapped the in-medium nucleon self-energies of a point coupling relativistic mean-field model on self-energies obtained in effective theories of QCD. More precisely, the contributions to the nucleon self-energy have been separated into the short range part, driven principally by the quark structure of the nucleon described in a quark-diquark picture, and the long range part, dictated by pion dynamics and determined using in-medium chiral perturbation theory. A saturation point, although unrealistic, is obtained without any free parameter. A realistic description of nuclear matter saturation properties has been obtained with the inclusion of a small phenomenological correction term to the short range part of the self-energy.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:35:38 GMT" }, { "version": "v2", "created": "Mon, 25 Feb 2008 10:52:40 GMT" }, { "version": "v3", "created": "Mon, 9 Jun 2008 12:50:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Huguet", "R.", "" ], [ "Caillon", "J. C.", "" ], [ "Labarsouque", "J.", "" ] ]
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712.3662
Nicolas Jacon
C\'edric Bonnaf\'e (LM-Besan\c{c}on), Nicolas Jacon (LM-Besan\c{c}on)
Cellular structures on Hecke algebras of type B
null
null
null
null
math.RT math.CO
null
The aim of this paper is to gather and (try to) unify several approaches for the modular representation theory of Hecke algebras of type $B$. We attempt to explain the connections between Geck's cellular structures (coming from Kazhdan-Lusztig theory with unequal parameters) and Ariki's Theorem on the canonical basis of the Fock spaces.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:39:08 GMT" }, { "version": "v2", "created": "Wed, 23 Apr 2008 09:39:25 GMT" }, { "version": "v3", "created": "Wed, 14 May 2008 07:45:01 GMT" } ]
2008-05-14T00:00:00
[ [ "Bonnafé", "Cédric", "", "LM-Besançon" ], [ "Jacon", "Nicolas", "", "LM-Besançon" ] ]
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712.3663
Hujeirat
A. Hujeirat, F.-K. Thielemann, J. Dusek, A. Nusser
Compressed low Mach number flows in astrophysics: a nonlinear Newtonian numerical solver
12 pages, 4 figures
null
null
null
astro-ph
null
Internal flows inside gravitationally stable astrophysical objects, such as the Sun, stars and compact stars are compressed and extremely subsonic. Such low Mach number flows are usually encountered when studying for example dynamo action in stars, planets, the hydro-thermodynamics of X-ray bursts on neutron stars and dwarf novae. Treating such flows is numerically complicated and challenging task. We aim to present a robust numerical tool that enables modeling the time-evolution or quasi-stationary of stratified low Mach number flows under astrophysical conditions. It is argued that astrophysical low Mach number flows cannot be considered as an asymptotic limit of incompressible flows, but rather as highly compressed flows with extremely stiff pressure terms. Unlike the pseudo-pressure in incompressible fluids, a Possion-like treatment for the pressure would smooth unnecessarily the physically induced acoustic perturbations, thereby violating the conservation character of the compressible equations. Moreover, classical dimensional splitting techniques, such as ADI or Line-Gauss-Seidel methods are found to be unsuited for modeling compressible flows with low Mach numbers. In this paper we present a nonlinear Newton-type solver that is based on the defect-correction iteration procedure and in which the Approximate Factorization Method (AFM) is used as a preconditioner. This solver is found to be sufficiently robust and is capable of capturing stationary solutions for viscous rotating flows with Mach number as small as $\mcal{M} \approx 10^{-3},$ i.e., near the incompressibility limit.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 10:52:56 GMT" } ]
2007-12-24T00:00:00
[ [ "Hujeirat", "A.", "" ], [ "Thielemann", "F. -K.", "" ], [ "Dusek", "J.", "" ], [ "Nusser", "A.", "" ] ]
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712.3664
Kazimierz St{\ke}pie\'n
L. Lipski and K. Stepien
Effective temperatures of magnetic CP stars from full spectral energy distributions
13 pages, 5 figures, accepted to MNRAS
Mon.Not.Roy.Astron.Soc.385:481,2008
10.1111/j.1365-2966.2008.12856.x
null
astro-ph
null
New determinations of effective temperatures of 23 magnetic, chemically peculiar (mCP) stars were obtained from a fit of metal enhanced model atmospheres to the observed spectral energy distributions (SED) from UV to red. The root-mean-square (RMS) method was used to fit the theoretical SED to the observations corrected for reddening if necessary, with metallicity and effective temperature as the fitting parameters. Gravity was assumed to be equal to log g = 4 for main sequence stars and to log g = 3 for two giants in the considered sample. Equal weights were given to the UV part and visual part of SED. Independently of the formal quality of fit resulting from the RMS method applied to the whole SED, the quality of fit was additionally checked for each star by determination of the temperature from the best fitting model atmosphere to the UV part and the visual part of SED separately. Both temperatures should be close to one another if the global best fitting model satisfactorily describes the full observed SED. This is the case for about a half of the investigated stars but the difference exceeds 750 K for the remaining stars with the extreme values above 2000 K. Possible reasons for such discrepancies are discussed. New, revised calibrations of effective temperature and bolometric corrections of mCP stars in terms of reddening free Stromgren indices are given.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:00:28 GMT" } ]
2008-11-07T00:00:00
[ [ "Lipski", "L.", "" ], [ "Stepien", "K.", "" ] ]
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712.3665
Paul M. Terwilliger
Kazumasa Nomura and Paul Terwilliger
Sharp tridiagonal pairs
24 pages
null
null
null
math.RA math.CO
null
Let $K$ denote a field and let $V$ denote a vector space over $K$ with finite positive dimension. We consider a pair of $K$-linear transformations $A:V \to V$ and $A^*:V \to V$ that satisfies the following conditions: (i) each of $A,A^*$ is diagonalizable; (ii) there exists an ordering ${V_i}_{i=0}^d$ of the eigenspaces of $A$ such that $A^* V_i \subseteq V_{i-1} + V_{i} + V_{i+1}$ for $0 \leq i \leq d$, where $V_{-1}=0$ and $V_{d+1}=0$; (iii) there exists an ordering ${V^*_i}_{i=0}^\delta$ of the eigenspaces of $A^*$ such that $A V^*_i \subseteq V^*_{i-1} + V^*_{i} + V^*_{i+1}$ for $0 \leq i \leq \delta$, where $V^*_{-1}=0$ and $V^*_{\delta+1}=0$; (iv) there is no subspace $W$ of $V$ such that $AW \subseteq W$, $A^* W \subseteq W$, $W \neq 0$, $W \neq V$. We call such a pair a {\em tridiagonal pair} on $V$. It is known that $d=\delta$ and for $0 \leq i \leq d$ the dimensions of $V_i$, $V_{d-i}$, $V^*_i$, $V^*_{d-i}$ coincide. We say the pair $A,A^*$ is {\em sharp} whenever $\dim V_0=1$. A conjecture of Tatsuro Ito and the second author states that if $K$ is algebraically closed then $A,A^*$ is sharp. In order to better understand and eventually prove the conjecture, in this paper we begin a systematic study of the sharp tridiagonal pairs.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:01:08 GMT" } ]
2007-12-24T00:00:00
[ [ "Nomura", "Kazumasa", "" ], [ "Terwilliger", "Paul", "" ] ]
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712.3666
Yuchun Wu
Yu-Chun Wu, Piotr Badziag, Marcin Wie\'sniak and Marek \.Zukowski
Extending Bell inequalities to more parties
8 pages, no figure
Phys. Rev. A 77 032105, 2008
10.1103/PhysRevA.77.032105
null
quant-ph
null
We describe a method of extending Bell inequalities from $n$ to $n+1$ parties and formulate sufficient conditions for our method to produce tight inequalities from tight inequalities. The method is non trivial in the sense that the inequalities produced by it, when applied to entangled quantum states may be violated stronger than the original inequalities. In other words, the method is capable of generating inequalities which are more powerfull indicators of non-classical correlations than the original inequalities.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:04:31 GMT" }, { "version": "v2", "created": "Tue, 6 May 2008 20:22:53 GMT" } ]
2008-05-06T00:00:00
[ [ "Wu", "Yu-Chun", "" ], [ "Badziag", "Piotr", "" ], [ "Wieśniak", "Marcin", "" ], [ "Żukowski", "Marek", "" ] ]
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712.3667
Marta Morigi Ms
Gustavo Fernandez Alcob\'er and Marta Morigi
Generalizing a theorem of P. Hall on finite-by-nilpotent groups
null
null
null
null
math.GR
null
Let $\gamma_i(G)$ and $Z_i(G)$ denote the $i$-th terms of the lower and upper central series of a group $G$, respectively. P. Hall showed that if $\gamma_{i+1}(G)$ is finite then the index $|G:Z_{2i}(G)|$ is finite. We prove that the same result holds under the weaker hypothesis that $|\gamma_{i+1}(G):\gamma_{i+1}(G)\cap Z_i(G)|$ is finite.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:08:12 GMT" } ]
2007-12-24T00:00:00
[ [ "Alcobér", "Gustavo Fernandez", "" ], [ "Morigi", "Marta", "" ] ]
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712.3668
Janusz Kaluzny
J. Kaluzny, I.B. Thompson
Variability Study of EHB Stars in the Globular Cluster NGC 6752
4 pages, 4 figures, to appear in "Hot Subdwarf Stars and Related Objects", ASP Conf. Ser
null
null
null
astro-ph
null
We present the results of a search for variable stars in the central part of the globular cluster NGC 6752. The monitored sample included 160 BHB and 107 EHB stars, respectively. A total of 17 variables were detected of which 14 are new identifications. Five variables are BHB/EHB stars. We report also on identification of a detached eclipsing binary being likely a member of the cluster. Moreover, we detected an outburst of a dwarf nova located in the cluster core.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:23:29 GMT" } ]
2007-12-24T00:00:00
[ [ "Kaluzny", "J.", "" ], [ "Thompson", "I. B.", "" ] ]
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712.3669
Marco Ruggieri
L. Campanelli and M. Ruggieri
Supersymmetric Q-balls: A Numerical Study
6 pages, 2 columns, 6 figures. To appear on Phys. Rev. D
Phys.Rev.D77:043504,2008
10.1103/PhysRevD.77.043504
null
hep-th hep-ph
null
We study numerically a class of non-topological solitons, the Q-balls, arising in supersymmetric extension of the Standard Model with low-energy, gauge-mediated symmetry breaking. % Taking into account the exact form of the supersymmetric potential giving rise to Q-balls, we find that there is a lower limit on the value of the charge $Q$ in order to make them classically stable: $Q \gtrsim 5 \times 10^2 Q_{\rm cr}$, where $Q_{\rm cr}$ is constant depending on the parameters defining the potential and can be in the range $1 \lesssim Q_{\rm cr} \lesssim 10^{8 \div 16}$.If $Q$ is the baryon number, stability with respect to the decay into protons requires $Q \gtrsim 10^{17} Q_{\rm cr}$, while if the gravitino mass is greater then $m_{3/2} \gtrsim 61 \MeV$, no stable gauge-mediation supersymmetric Q-balls exist. Finally, we find that energy and radius of Q-balls can be parameterized as $E \sim \xi_E Q^{3/4}$ and $R \sim \xi_R Q^{1/4}$, where $\xi_E$ and $\xi_R$ are slowly varying functions of the charge.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:24:11 GMT" } ]
2008-11-26T00:00:00
[ [ "Campanelli", "L.", "" ], [ "Ruggieri", "M.", "" ] ]
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712.367
Vadim Schechtman
Vassily Gorbounov and Vadim Schechtman
Homological Algebra and Divergent Series
null
SIGMA 5 (2009), 034, 31 pages
10.3842/SIGMA.2009.034
null
math.AG
http://creativecommons.org/licenses/by-nc-sa/3.0/
We study some features of infinite resolutions of Koszul algebras motivated by the developments in the string theory initiated by Berkovits.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:56:32 GMT" }, { "version": "v2", "created": "Wed, 8 Oct 2008 16:45:36 GMT" }, { "version": "v3", "created": "Tue, 24 Mar 2009 06:03:26 GMT" } ]
2009-03-24T00:00:00
[ [ "Gorbounov", "Vassily", "" ], [ "Schechtman", "Vadim", "" ] ]
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712.3671
Nedzad Limic
Nedzad Limi\'c and Mladen Rogina
Monotone Numerical Schemes for a Dirichlet Problem for Elliptic Operators in Divergence Form
22 pages, 1 figure
null
null
null
math.AP math.NA
null
We consider a second order differential operator $A(\msx) = -\:\sum_{i,j=1}^d \partial_i a_{ij}(\msx) \partial_j \:+\: \sum_{j=1}^d \partial_j \big(b_j(\msx) \cdot \big)\:+\: c(\msx)$ on ${\bbR}^d$, on a bounded domain $D$ with Dirichlet boundary conditions on $\partial D$, under mild assumptions on the coefficients of the diffusion tensor $a_{ij}$. The object is to construct monotone numerical schemes to approximate the solution to the problem $A(\msx) u(\msx) \: = \: \mu(\msx), \quad \msx \in D$, where $\mu$ is a positive Radon measure. We start by briefly mentioning questions of existence and uniqueness, introducing function spaces needed to prove convergence results. Then, we define non-standard stencils on grid-knots that lead to extended discretization schemes by matrices possesing compartmental structure. We proceed to discretization of elliptic operators, starting with constant diffusion tensor and ending with operators in divergence form. Finally, we discuss $W_2^1$-convergence in detail, and mention convergence in $C$ and $L_1$ spaces. We conclude by a numerical example illustarting the schemes and convergence results.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:36:31 GMT" } ]
2007-12-24T00:00:00
[ [ "Limić", "Nedzad", "" ], [ "Rogina", "Mladen", "" ] ]
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712.3672
Prasanta K. Panigrahi
Priyam Das, T. Solomon Raju, Utpal Roy and Prasanta K. Panigrahi
Sinusoidal Excitations in Two Component Bose-Einstein Condensates
6 pages, 1 figure
PHYSICAL REVIEW A 79, 015601 (2009)
10.1103/PhysRevA.79.015601
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The non-linear coupled Gross-Pitaevskii equation governing the dynamics of the two component Bose-Einstein condensate (TBEC) is shown to admit pure sinusoidal, propagating wave solutions in quasi one dimensional geometry. These solutions, which exist for a wide parameter range, are then investigated in the presence of a harmonic oscillator trap with time dependent scattering length. This illustrates the procedure for coherent control of these modes through temporal modulation of the parameters, like scattering length and oscillator frequency. We subsequently analyzed this system in an optical lattice, where the occurrence of an irreversible phase transition from superfluid to insulator phase is seen.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:43:08 GMT" }, { "version": "v2", "created": "Mon, 23 Nov 2009 10:35:41 GMT" } ]
2009-11-23T00:00:00
[ [ "Das", "Priyam", "" ], [ "Raju", "T. Solomon", "" ], [ "Roy", "Utpal", "" ], [ "Panigrahi", "Prasanta K.", "" ] ]
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712.3673
Jan Wiersig
Jan Wiersig, J\"org Main
Fractal Weyl law for chaotic microcavities: Fresnel's laws imply multifractal scattering
8 pages, 12 figures
null
10.1103/PhysRevE.77.036205
null
nlin.CD physics.optics
null
We demonstrate that the harmonic inversion technique is a powerful tool to analyze the spectral properties of optical microcavities. As an interesting example we study the statistical properties of complex frequencies of the fully chaotic microstadium. We show that the conjectured fractal Weyl law for open chaotic systems [W. T. Lu, S. Sridhar, and M. Zworski, Phys. Rev. Lett. 91, 154101 (2003)] is valid for dielectric microcavities only if the concept of the chaotic repeller is extended to a multifractal by incorporating Fresnel's laws.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:49:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Wiersig", "Jan", "" ], [ "Main", "Jörg", "" ] ]
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712.3674
Hujeirat
A. Hujeirat, B.W. Keil and F. Heitsch
Advanced numerical methods in astrophysical fluid dynamics
25 pages, 11 figures,
null
null
null
astro-ph
null
Computational gas dynamics has become a prominent research field both in astrophysics and cosmology. In the first part of this review we intend to briefly describe several of the numerical methods used in this field, discuss their range of application and present strategies for converting conditionally-stable numerical methods into unconditionally-stable solution procedures. The underlying aim of the conversion is to enhance the robustness and unification of numerical methods and subsequently enlarge their range of applications considerably. In the second part Fabian Heitsch presents and discusses the implementation of a time-explicit MHD Boltzmann solver.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:55:05 GMT" } ]
2007-12-24T00:00:00
[ [ "Hujeirat", "A.", "" ], [ "Keil", "B. W.", "" ], [ "Heitsch", "F.", "" ] ]
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712.3675
Mario Ziman
Mario Ziman, Teiko Heinosaari
Discrimination of quantum observables using limited resources
8 pages, no figures
Phys. Rev. A 77, 042321 (2008)
10.1103/PhysRevA.77.042321
null
quant-ph
null
We address the problem of unambiguous discrimination and identification among quantum observables. We set a general framework and investigate in details the case of qubit observables. In particular, we show that perfect discrimination with two shots is possible only for sharp qubit observables (e.g. Stern-Gerlach apparatuses) associated with mutually orthogonal directions. We also show that for sharp qubit observables associated to nonorthogonal directions unambiguous discrimination with an inconclusive result is always possible.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:55:23 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 15:35:02 GMT" } ]
2008-07-15T00:00:00
[ [ "Ziman", "Mario", "" ], [ "Heinosaari", "Teiko", "" ] ]
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712.3676
Florian Marty
Florian Marty
Relative Zariski Open Objects
19 pages. A more general main theorem has been proved. The organisation has been modified
null
null
null
math.AG math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [TV], Bertrand To\"en and Michel Vaqui\'e define a scheme theory for a closed monoidal category $(\mathcal{C},\otimes,1)$. One of the key ingredients of this theory is the definition of a Zariski topology on the category of commutative monoids in $\mathcal{C}$. The purpose of this article is to prove that under some hypotheses, Zariski open subobjects of affine schemes can be classified almost as in the usual case of rings $(Z-mod,\otimes,Z)$. The main result states that for any commutative monoid $A$, the locale of Zariski open subobjects of the affine scheme $Spec(A)$ is associated to a topological space whose points are prime ideals of $A$ and open subsets are defined by the same formula as in rings. As a consequence, we compare the notions of scheme over $\mathbb{F}_{1}$ of [D] and [TV].
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:55:28 GMT" }, { "version": "v2", "created": "Thu, 6 Nov 2008 16:19:10 GMT" }, { "version": "v3", "created": "Tue, 12 May 2009 08:36:21 GMT" } ]
2009-05-12T00:00:00
[ [ "Marty", "Florian", "" ] ]
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712.3677
N. W. Evans
P.E. Verrier (Cambridge), N.W. Evans (Cambridge)
A New Superintegrable Hamiltonian
11 pages, 4 figures, submitted to The Journal of Mathematical Physics
null
10.1063/1.2840465
null
nlin.SI astro-ph
null
We identify a new superintegrable Hamiltonian in 3 degrees of freedom, obtained as a reduction of pure Keplerian motion in 6 dimensions. The new Hamiltonian is a generalization of the Keplerian one, and has the familiar 1/r potential with three barrier terms preventing the particle crossing the principal planes. In 3 degrees of freedom, there are 5 functionally independent integrals of motion, and all bound, classical trajectories are closed and strictly periodic. The generalisation of the Laplace-Runge-Lenz vector is identified and shown to provide functionally independent isolating integrals. They are quartic in the momenta and do not arise from separability of the Hamilton-Jacobi equation. A formulation of the system in action-angle variables is presented.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:58:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Verrier", "P. E.", "", "Cambridge" ], [ "Evans", "N. W.", "", "Cambridge" ] ]
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712.3678
Nedzad Limic
Nedzad Limi\'c and Mladen Rogina
Numerical approach to $L_1$-problems with the second order elliptic operators
33 pages
null
null
null
math.AP math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a second order differential operator $A(\msx) =-\nabla a(\msx)\nabla + b'(\msx)\nabla+ \nabla \big(\msb''(\msx) \cdot\big)$ on a bounded domain $D$ with the Dirichlet boundary conditions on $\partial D$ there exists the inverse $T(\lambda, A)= (\lambda I+A)^{-1}$ in $L_1(D)$. If $\mu$ is a Radon (probability) measure on Borel algebra of subsets of $D$, then $T(\lambda, A)\mu \in L_p(D), p \in [1, d/(d-1))$. We construct the numerical approximations to $u =T(\lambda, A)\mu$ in two steps. In the first one we construct grid-solutions ${\bf u}_n$ and in the second step we embed grid-solutions into the linear space of hat functions $u(n) \in \dot{W}_p^1(D)$. The strong convergence to the original solutions $u$ is established in $L_p(D)$ and the weak convergence in $\dot{W}_p^1(D)$.
[ { "version": "v1", "created": "Fri, 21 Dec 2007 11:59:42 GMT" }, { "version": "v2", "created": "Thu, 28 Aug 2008 13:08:37 GMT" } ]
2008-08-28T00:00:00
[ [ "Limić", "Nedzad", "" ], [ "Rogina", "Mladen", "" ] ]
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