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712.3979
Utkir Rozikov A
U.A.Rozikov and A.Zada
On Dynamics of $\ell$- Volterra Quadratic Stochastic Operators
16 pages
null
null
null
math.DS
null
We introduce a notion of $\ell$-Volterra quadratic stochastic operator defined on $(m-1)$-dimensional simplex, where $\ell\in\{0,1,...,m\}$. The $\ell$-Volterra operator is a Volterra operator iff $\ell=m$. We study structure of the set of all $\ell$-Volterra operators and describe their several fixed and periodic points. For $m=2$ and 3 we describe behavior of trajectories of $(m-1)$-Volterra operators. The paper also contains many remarks with comparisons of $\ell$-Volterra operators and Volterra ones.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 09:00:11 GMT" } ]
2007-12-27T00:00:00
[ [ "Rozikov", "U. A.", "" ], [ "Zada", "A.", "" ] ]
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712.398
Vincent Gramoli
Antonio Fernandez (LADyR), Vincent Gramoli (INRIA Futurs, IRISA), Ernesto Jimenez (EUI), Anne-Marie Kermarrec (IRISA), Michel Raynal (IRISA)
Distributed Slicing in Dynamic Systems
null
Dans The 27th International Conference on Distributed Computing Systems (ICDCS'07) (2007) 66
null
ICDCS07
cs.DC
null
Peer to peer (P2P) systems are moving from application specific architectures to a generic service oriented design philosophy. This raises interesting problems in connection with providing useful P2P middleware services capable of dealing with resource assignment and management in a large-scale, heterogeneous and unreliable environment. The slicing service, has been proposed to allow for an automatic partitioning of P2P networks into groups (slices) that represent a controllable amount of some resource and that are also relatively homogeneous with respect to that resource. In this paper we propose two gossip-based algorithms to solve the distributed slicing problem. The first algorithm speeds up an existing algorithm sorting a set of uniform random numbers. The second algorithm statistically approximates the rank of nodes in the ordering. The scalability, efficiency and resilience to dynamics of both algorithms rely on their gossip-based models. These algorithms are proved viable theoretically and experimentally.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 13:55:47 GMT" } ]
2007-12-27T00:00:00
[ [ "Fernandez", "Antonio", "", "LADyR" ], [ "Gramoli", "Vincent", "", "INRIA Futurs, IRISA" ], [ "Jimenez", "Ernesto", "", "EUI" ], [ "Kermarrec", "Anne-Marie", "", "IRISA" ], [ "Raynal", "Michel", "", "IRISA" ] ]
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712.3981
Vladimir Zhuravlev
T. Maniv and V. Zhuravlev
The Nature of the Superconducting phase Transitions in Strongly type-II Superconductors in the Pauli Paramagnetic limit
12 pages, 6 figures
null
null
null
cond-mat.supr-con
null
Superconducting phase transitions in strongly type-II superconductors in the Pauli paramagnetic limit are considered within the framework of the Gorkov-Ginzburg-Landau approach in the lowest Landau level approximation for both s and d-wave electron pairing. Simple analytical expressions for the quadratic and quartic coefficients in the order parameter expansion of the superconducting free energy are derived without relying on gradient or wavenumber expansions. The existence of a changeover from continuos to discontinuos superconducting phase transitions predicted to occur in the clean limit is shown to depend only on the dimensionality of the underlying electronic band structure. Such a changeover can take place in the quasi 2D regime below a critical value of a 3D-2D crossover parameter.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 09:56:58 GMT" } ]
2007-12-27T00:00:00
[ [ "Maniv", "T.", "" ], [ "Zhuravlev", "V.", "" ] ]
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712.3982
David Wiltshire
David L. Wiltshire
Gravitational energy and cosmic acceleration
9 pages, 2 figures. An essay which received Honorable Mention in the 2007 GRF Essay Competition. To appear in a special issue of Int. J. Mod. Phys. D
Int.J.Mod.Phys.D17:641-649,2008
10.1142/S0218271808012383
null
gr-qc astro-ph
null
Cosmic acceleration is explained quantitatively, as an apparent effect due to gravitational energy differences that arise in the decoupling of bound systems from the global expansion of the universe. "Dark energy" is a misidentification of those aspects of gravitational energy which by virtue of the equivalence principle cannot be localised, namely gradients in the energy due to the expansion of space and spatial curvature variations in an inhomogeneous universe. A new scheme for cosmological averaging is proposed which solves the Sandage-de Vaucouleurs paradox. Concordance parameters fit supernovae luminosity distances, the angular scale of the sound horizon in the CMB anisotropies, and the effective comoving baryon acoustic oscillation scale seen in galaxy clustering statistics. Key observational anomalies are potentially resolved, and unique predictions made, including a quantifiable variance in the Hubble flow below the scale of apparent homogeneity.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 10:04:12 GMT" } ]
2008-11-26T00:00:00
[ [ "Wiltshire", "David L.", "" ] ]
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712.3983
Davor Horvatic
D. Horvatic, D. Klabucar and D. Mekterovic
Unexpectedly small empirical vector strangeness of nucleons realized in a baryon model
10 pages, 2 figures, ICTP preprint number: IC2007033
Fizika B16:89-98,2007
null
IC2007033
hep-ph
null
Most of model considerations of the hidden nucleon strangeness, as well as some preliminary experimental evidence, led to the expectations of relatively sizeable strange vector form factors of the proton. For example, it seemed that the contribution of the fluctuating strange quark-antiquark pairs accounts for as much as one tenth of the proton's magnetic moment. By the same token, baryon models which failed to produce the "vector strangeness" of the nucleon seemed disfavored. Recently, however, more accurate measurements and more sophisticated data analysis, as well as lattice simulations, revealed that the form factors associated with the vector strangeness of the nucleon are much smaller than thought previously; in fact, due to the experimental uncertainties, the measured strange vector-current proton form factors may be consistent with zero. In the light of that, we re-asses the merit of the baryon models leading to little or no vector strangeness of the nucleon. It is done on the concrete example of the baryon model which essentially amounts to the MIT bag enriched by the diluted instanton liquid.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 15:28:33 GMT" } ]
2009-12-15T00:00:00
[ [ "Horvatic", "D.", "" ], [ "Klabucar", "D.", "" ], [ "Mekterovic", "D.", "" ] ]
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712.3984
David Wiltshire
David L. Wiltshire
Dark energy without dark energy
32 pages, 8 figures; Invited contribution to appear in the Proceedings of the Dark2007 Conference, Sydney, Australia, Sept 2007, eds H. Klapdor-Kleingrothaus and G.F. Lewis, (World Scientific, Singapore, 2008)
null
10.1142/9789812814357_0053
null
astro-ph gr-qc
null
An overview is presented of a recently proposed "radically conservative" solution to the problem of dark energy in cosmology. The proposal yields a model universe which appears to be quantitatively viable, in terms of its fit to supernovae luminosity distances, the angular scale of the sound horizon in the cosmic microwave background (CMB) anisotropy spectrum, and the baryon acoustic oscillation scale. It may simultaneously resolve key anomalies relating to primordial lithium abundances, CMB ellipticity, the expansion age of the universe and the Hubble bubble feature. The model uses only general relativity, and matter obeying the strong energy condition, but revisits operational issues in interpreting average measurements in our presently inhomogeneous universe, from first principles. The present overview examines both the foundational issues concerning the definition of gravitational energy in a dynamically expanding space, the quantitative predictions of the new model and its best-fit cosmological parameters, and the prospects for an era of new observational tests in cosmology.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 17:41:50 GMT" } ]
2017-08-23T00:00:00
[ [ "Wiltshire", "David L.", "" ] ]
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712.3985
Huanyang Chen
Huanyang Chen and C. T. Chan
Time delays and energy transport velocities in three dimensional ideal cloaking
A scaling factor is added to convert the parameter \tau into the physical time
J. Appl. Phys. 104, 033113 (2008)
10.1063/1.2967815
null
physics.optics
null
We obtained the energy transport velocity distribution for a three dimensional ideal cloak explicitly. Near the operation frequency, the energy transport velocity has rather peculiar distribution. The velocity along a line joining the origin of the cloak is a constant, while the velocity approaches zero at the inner boundary of the cloak. A ray pointing right into the origin of the cloak will experience abrupt changes of velocities when it impinges on the inner surface of the cloak. This peculiar distribution causes infinite time delays for the ideal cloak within a geometric optics description.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 10:19:51 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 08:31:20 GMT" }, { "version": "v3", "created": "Mon, 28 Apr 2008 13:33:02 GMT" } ]
2008-08-13T00:00:00
[ [ "Chen", "Huanyang", "" ], [ "Chan", "C. T.", "" ] ]
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712.3986
Andrey Miroshnichenko
Andrey E. Miroshnichenko, Etienne Brasselet, and Yuri S. Kivshar
All-optical switching and multistability in photonic structures with liquid crystal defects
4 pages, 3 figures
null
10.1063/1.2949076
null
cond-mat.soft
null
We demonstrate that one-dimensional photonic crystals with pure nematic liquid-crystal defects can operate as all-optical switching devices based on optical orientational nonlinearities of liquid crystals. We show that such a periodic structure is responsible for a modulated threshold of the optical Fr\'eedericksz transition in the spectral domain, and this leads to all-optical switching and light-induced multistability. This effect has no quasi-statics electric field analogue, and it results from nonlinear coupling between light and a defect mode.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 10:23:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Miroshnichenko", "Andrey E.", "" ], [ "Brasselet", "Etienne", "" ], [ "Kivshar", "Yuri S.", "" ] ]
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712.3987
Oliver Petras
Oliver Petras
Functional equations of the dilogarithm in motivic cohomology
21 pages, no figures; accepted for publication in the Journal of Number Theory
Journal of Number Theory 129 (2009) pp. 2346-2368
10.1016/j.jnt.2009.04.009
null
math.NT math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove relations between fractional linear cycles in Bloch's integral cubical higher Chow complex in codimension two of number fields, which correspond to functional equations of the dilogarithm. These relations suffice, as we shall demonstrate with a few examples, to write down enough relations in Bloch's integral higher Chow group CH^2(F,3) for certain number fields F to detect torsion cycles. Using the regulator map to Deligne cohomology, one can check the non-triviality of the torsion cycles thus obtained. Using this combination of methods, we obtain explicit higher Chow cycles generating the integral motivic cohomology groups of some number fields.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 11:01:51 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 16:49:36 GMT" }, { "version": "v3", "created": "Tue, 3 Jun 2008 21:18:47 GMT" }, { "version": "v4", "created": "Tue, 1 Sep 2009 12:29:07 GMT" } ]
2009-09-01T00:00:00
[ [ "Petras", "Oliver", "" ] ]
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712.3988
Ashish Goel
Ashish Goel and Arnab Rai Choudhuri
The Hemispheric Asymmetry of Solar Activity During the Twentieth Century and the Solar Dynamo
14 pages, 6 figures
Res.Astron.Astrophys.9:115-126,2009
10.1088/1674-4527/9/1/010
null
astro-ph
null
We believe the Babcock--Leighton process of poloidal field generation to be the main source of irregularity in the solar cycle. The random nature of this process may make the poloidal field in one hemisphere stronger than that in the other hemisphere at the end of a cycle. We expect this to induce an asymmetry in the next sunspot cycle. We look for evidence of this in the observational data and then model it theoretically with our dynamo code. Since actual polar field measurements exist only from 1970s, we use the polar faculae number data recorded by Sheeley (1991) as a proxy of the polar field and estimate the hemispheric asymmetry of the polar field in different solar minima during the major part of the twentieth century. This asymmetry is found to have a reasonable correlation with the asymmetry of the next cycle. We then run our dynamo code by feeding information about this asymmetry at the successive minima and compare with observational data. We find that the theoretically computed asymmetries of different cycles compare favourably with the observational data, the correlation coefficient being 0.73. Due to the coupling between the two hemispheres, any hemispheric asymmetry tends to get attenuated with time. The hemispheric asymmetry of a cycle either from observational data or from theoretical calculation statistically tends to be less than the asymmetry in the polar field (as inferred from the faculae data) in the preceding minimum. This reduction factor turns out to be 0.38 and 0.60 respectively in observational data and theoretical simulation.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 11:29:44 GMT" } ]
2009-02-09T00:00:00
[ [ "Goel", "Ashish", "" ], [ "Choudhuri", "Arnab Rai", "" ] ]
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712.3989
J. Q. You
Shi-Hua Ouyang, Chi-Hang Lam, J. Q. You
Shot noise in a quantum dot coupled to non-magnetic leads: Effects of Coulomb interaction
10 pages, 3 figures
Eur. Phys. J. B 64, 67 (2008)
10.1140/epjb/e2008-00272-0
null
cond-mat.mes-hall cond-mat.stat-mech quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study electron transport through a quantum dot, connected to non-magnetic leads, in a magnetic field. A super-Poissonian electron noise due to the effects of both interacting localized states and dynamic channel blockade is found when the Coulomb blockade is partially lifted. This is sharp contrast to the sub-Poissonian shot noise found in the previous studies for a large bias voltage, where the Coulomb blockade is completely lifted. Moreover, we show that the super-Poissonian shot noise can be suppressed by applying an electron spin resonance (ESR) driving field. For a sufficiently strong ESR driving field strength, the super-Poissonian shot noise will change to be sub-Poissonian.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 11:29:27 GMT" }, { "version": "v2", "created": "Thu, 31 Jul 2008 02:03:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Ouyang", "Shi-Hua", "" ], [ "Lam", "Chi-Hang", "" ], [ "You", "J. Q.", "" ] ]
[ 0.0043831095, -0.1062120795, -0.0944493413, 0.0080403537, 0.0052392585, 0.0334270261, 0.063528724, 0.0165273938, -0.085614875, -0.0807013288, 0.0453138463, 0.1284471303, -0.0691371188, 0.1495902836, -0.0060395715, -0.056729164, -0.0633798242, -0.0238604937, 0.0398791619, 0.0272230487, -0.0984198824, -0.0147282407, 0.0569773205, -0.0061729569, -0.0568780564, -0.0367275402, 0.1047231257, 0.0503018424, 0.0395069234, 0.0311687794, 0.0020147415, -0.0394572914, -0.0915706977, -0.1029363796, -0.144924894, 0.055885423, -0.0154230855, -0.003979851, -0.0934070721, -0.0407725349, 0.0235999264, -0.0299776159, -0.058416646, 0.0784182623, 0.099114731, -0.0233145449, -0.025833359, -0.110083364, 0.0533542, -0.0070911455, 0.0105033321, -0.0255603846, -0.0290097948, 0.0073827324, -0.0415170118, -0.0456116349, 0.0980724618, 0.0605508126, 0.0291338749, -0.0270741545, 0.0370253325, -0.0115766209, -0.0206840578, 0.0595581755, -0.0331788659, -0.0311439633, -0.0554387346, -0.1110759974, 0.0298535358, 0.0671518445, 0.0356604569, 0.0489617847, 0.0888905749, 0.0344196633, -0.004572331, 0.0565306358, -0.1137561128, -0.0262304135, -0.0036045103, 0.0863097236, 0.0744477212, -0.0047305324, 0.1054179743, -0.0700304881, -0.1340058893, -0.0190834329, -0.0119116353, -0.1240795329, -0.0273471288, -0.0326825492, 0.0057510864, 0.0422118567, -0.0501281321, 0.0020550673, -0.0253990814, 0.0181776509, 0.0577714294, -0.0026785668, 0.105020918, 0.0122776702, 0.0184878502, -0.0348415338, 0.0242947731, -0.0949456617, 0.1990235746, 0.0129042715, -0.0296550076, -0.0339977928, 0.0036727542, 0.0658614188, 0.2080565691, 0.0437008105, -0.0384894721, 0.0867067799, -0.1060135514, -0.1098848358, 0.0070601255, 0.0414673798, 0.044122681, 0.0089399302, -0.1246751174, 0.0211555604, 0.0470261425, 0.0477706194, 0.1038297564, -0.0143560022, 0.0080093341, -0.1613033861, -0.0656132549, -0.035858985, 0.0627346113, 0.0482173078, -0.1112745255, -0.0308958031, -0.0332533158, -0.0060457755, -0.0001842775, 0.0276945513, 0.0199519899, -0.087302357, 0.081495434, -0.0139961718, 0.0078418264, 0.047448013, 0.0605011806, 0.0645709857, 0.0301513262, 0.0001428853, 0.0485399142, 0.0465794578, 0.0256596468, -0.0919677466, 0.0402265862, 0.0232897289, 0.0570765845, -0.0083443485, -0.0014230371, 0.1480020732, -0.021701511, -0.0740010366, 0.0667547882, 0.0889402106, -0.0437256284, -0.1014970616, 0.1042268053, 0.0128670475, -0.0308461711, -0.0233765841, -0.0748944059, -0.0599552318, -0.0322606787, -0.0476217233, -0.0015432392, -0.0416162759, 0.1624945551, 0.0261807814, -0.0203986745, -0.0944493413, -0.0089709507, 0.0720157623, -0.003750304, 0.0024722847, 0.0375216492, 0.0025529363, 0.0094300443, -0.0572254807, 0.0431548618, 0.1155428588, -0.0137852365, -0.0791131109, -0.029183507, 0.0396061875, 0.0333029479, 0.0965338796, -0.0589129627, -0.1022415385, 0.0667547882, 0.090776585, -0.0530564077, -0.0802050084, 0.0311687794, 0.0159690361, -0.0657621548, 0.0636776164, -0.1035319641, -0.0157332849, 0.0963849798, -0.0177930053, -0.1010007411, 0.056729164, 0.047497645, -0.0155471656, 0.0923151746, -0.032608103, -0.0473735668, -0.0043800077, 0.0205723867, 0.021726327, 0.004004667, 0.0456860848, -0.007469588, 0.0546942577, 0.0618908703, 0.0619405024, -0.0052950941, 0.0110368747, 0.0440482348, -0.0193688143, -0.0303746704, -0.0595085435, 0.0115828244, 0.0099263629, 0.0018999679, -0.0708246008, 0.0309454352, -0.0557861589, -0.050872609, -0.0269748904, -0.100802213, -0.0828851312, -0.040871799, -0.0526097231, 0.0174083579, 0.040871799, -0.1044253334, 0.0331292339, -0.0511704013, -0.0304739326, 0.0237364154, -0.0359830633, -0.0768796802, 0.0376209132, -0.0933574438, 0.0479939617, 0.0024319589, -0.0262304135 ]
712.399
Rajeev K P
Devendra Kumar, K. P. Rajeev, J. A. Alonso, M. J. Martinez-Lope
Supercooling and the Metal-Insulator Phase Transition of NdNiO$_{3}$
8 pages, 6 figures
null
null
null
cond-mat.other
null
We report the temperature and time dependence of electrical resistivity on high temperature, high oxygen pressure prepared polycrystalline samples of NdNiO_3. NdNiO_3 is metallic above 195 K and below that temperature it undergoes a transition to an insulating state. We find that on cooling NdNiO_3 below 195 K it goes into a state which is not in thermodynamic equilibrium and slowly relaxes over several hours. As we cool it further and go below about 110 K it goes into a stable insulating state. On heating the system from the insulating state towards 200 K we find that it remains stable and insulating and undergoes a rather sharp insulator to metal transition in the temperature range 185 K to 195 K. We try to make sense of these and a few other interesting observations on the basis of our current understanding of first order phase transitions, supercooling, and metal-insulator transitions.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 11:38:09 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 13:32:45 GMT" } ]
2008-01-10T00:00:00
[ [ "Kumar", "Devendra", "" ], [ "Rajeev", "K. P.", "" ], [ "Alonso", "J. A.", "" ], [ "Martinez-Lope", "M. J.", "" ] ]
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712.3991
Alexandr V. Sologubenko
A. V. Sologubenko, T. Lorenz, J. A. Mydosh, A. Rosch, K. C. Shortsleeves, and M. M. Turnbull
Field-dependent thermal transport in the Haldane chain compound NENP
4 pages, 4 figures
Phys. Rev. Lett. 100, 137202 (2008)
10.1103/PhysRevLett.100.137202
null
cond-mat.str-el cond-mat.mtrl-sci
null
We present a study of the magnetic field-dependent thermal transport in the spin S=1 chain material Ni(C2H8N2)2NO2(ClO4) (NENP). The measured thermal conductivity is found to be very sensitive to the field-induced changes in the spin excitation spectrum. The magnetic contribution to the total heat conductivity is analyzed in terms of a quasiparticle model, and we obtain a temperature and momentum independent mean free path. This implies that the motion of quasiparticles is effectively three dimensional despite the tiny interchain coupling.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 11:52:11 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 15:11:59 GMT" } ]
2008-04-02T00:00:00
[ [ "Sologubenko", "A. V.", "" ], [ "Lorenz", "T.", "" ], [ "Mydosh", "J. A.", "" ], [ "Rosch", "A.", "" ], [ "Shortsleeves", "K. C.", "" ], [ "Turnbull", "M. M.", "" ] ]
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712.3992
Arnab Chatterjee
Bikas K. Chakrabarti, Arnab Chatterjee, Pratip Bhattacharyya
Two Fractal Overlap Time Series: Earthquakes and Market Crashes
2 column RevTeX4, 4 pages, 5 eps figures; Published in "Econophysics of Stock and Other Markets", Eds. A. Chatterjee, B. K. Chakrabarti, New Economic Windows Series, Springer, Milan (2006); Sec V and 2 refs added new in this arXiv version
null
null
null
physics.soc-ph q-fin.ST
null
We find prominent similarities in the features of the time series for the (model earthquakes or) overlap of two Cantor sets when one set moves with uniform relative velocity over the other and time series of stock prices. An anticipation method for some of the crashes have been proposed here, based on these observations.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 11:58:13 GMT" } ]
2008-12-02T00:00:00
[ [ "Chakrabarti", "Bikas K.", "" ], [ "Chatterjee", "Arnab", "" ], [ "Bhattacharyya", "Pratip", "" ] ]
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712.3993
Zoltan Racz
G. Gyorgyi, N. R. Moloney, K. Ozogany, Z. Racz (Eotvos University)
Finite-size scaling in extreme statistics
4 pages, 3 figures
null
10.1103/PhysRevLett.100.210601
null
cond-mat.stat-mech
null
We study the convergence and shape correction to the limit distributions of extreme values due to the finite size (FS) of data sets. A renormalization method is introduced for the case of independent, identically distributed (iid) variables, showing that the iid universality classes are subdivided according to the exponent of the FS convergence, which determines the leading order FS shape correction function as well. We find that, for the correlated systems of subcritical percolation and 1/f^alpha stationary (alpha<1) noise, the iid shape correction compares favorably to simulations. Furthermore, for the strongly correlated regime (alpha>1) of 1/f^alpha noise, the shape correction is obtained in terms of the limit distribution itself.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 12:03:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Gyorgyi", "G.", "", "Eotvos University" ], [ "Moloney", "N. R.", "", "Eotvos University" ], [ "Ozogany", "K.", "", "Eotvos University" ], [ "Racz", "Z.", "", "Eotvos University" ] ]
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712.3994
Sergey Simakov S
A.S. Kholodov, S.S. Simakov, A.A. Nadolsky, A.N. Shushlebin
Computational study of the vibrating disturbances to the lung function
15 pages, III ECCM
Proceedings of the III European COnference on Computational Mechanics, eds. C.A. Mota Soares et. al. 2006, pp. 1464.1-1464.15
null
null
physics.bio-ph physics.med-ph
null
Frequently during its lifetime a human organism is subjected to the acoustical and similar to them vibrating impacts. Under the certain conditions such influence may cause physiological changes in the organs functioning. Thus the study of the oscillatory mechanical impacts to the organism is very important task of the numerical physiology. It allows to investigate the endurance limits of the organism and to develop protective measures in order to extend them. The noise nuisances affects to the most parts of the organism disrupting their functions. The vibrating disturbances caused to the lung function as one of the most sensitive to the acoustical impacts is considered in this work. The model proposed to describe the air motion in trachea-bronchial tree is based on the one dimensional no-linear theory including mass and momentum conservation for the air flow in flexible tubes.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 12:04:55 GMT" } ]
2007-12-27T00:00:00
[ [ "Kholodov", "A. S.", "" ], [ "Simakov", "S. S.", "" ], [ "Nadolsky", "A. A.", "" ], [ "Shushlebin", "A. N.", "" ] ]
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712.3995
Petr M. Lavrov
I.L. Buchbinder and P.M. Lavrov
BRST charge for nonlinear algebras
4 pages, Latex, base on the talk given by P.M. Lavrov at the International Workshop "Supersymmetries and Quantum Symmetries, Dubna, 2007. To be publish in the Proceedings, a reference added
null
null
null
hep-th
null
We study the construction of the classical nilpotent canonical BRST charge for the nonlinear gauge algebras where a commutator (in terms of Poisson brackets) of the constraints is a finite order polynomial of the constraints.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 12:13:32 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 11:05:11 GMT" } ]
2008-01-24T00:00:00
[ [ "Buchbinder", "I. L.", "" ], [ "Lavrov", "P. M.", "" ] ]
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712.3996
Alexander V. Karzanov
Vladimir I. Danilov, Alexander V. Karzanov, Gleb A. Koshevoy
On bases of tropical Pl\"ucker functions
44 pages. This is a revision of the original version, where some improvements are done and new results are added (in particular, the classes of submodular and discrete concave tropical Pl\"ucker functions are characterized, and a tropical analogue of the Laurent phenomenon is shown
null
null
null
math.CO
null
We consider functions $f:B\to\Rset$ that obey tropical analogs of classical Pl\"ucker relations on minors of a matrix. The most general set $B$ that we deal with in this paper is of the form $\{x\in \Zset^n\colon 0\le x\le a, m\le x_1+...+x_n\le m'\}$ (a rectangular integer box ``truncated from below and above''). We construct a basis for the set $\Tscr$ of tropical Pl\"ucker functions on $B$, a subset $\Bscr\subseteq B$ such that the restriction map $\Tscr\to\Rset^\Bscr$ is bijective. Also we characterize, in terms of the restriction to the basis, the classes of submodular, so-called skew-submodular, and discrete concave functions in $\Tscr$, discuss a tropical analogue of the Laurentness property, and present other results.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 12:16:22 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 11:46:02 GMT" } ]
2008-02-11T00:00:00
[ [ "Danilov", "Vladimir I.", "" ], [ "Karzanov", "Alexander V.", "" ], [ "Koshevoy", "Gleb A.", "" ] ]
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712.3997
Valentin Voroshilov
Valentin Voroshilov
A simple model for describing a lattice with a double occupancy
a small cosmetic correction of the first version
null
null
null
cond-mat.other
null
A simple model is presented to investigate an impact of the double occupied sites on the ground state energy of a lattice. The model is seen as a useful tool to introduce undergraduate or graduate physics students to an array of a relatively simple mathematical apparatus and physical ideas which they can choose later for a deeper study. Instead of analyzing a system of electrons in a periodic potential, a system of sites having different energy states related to a number of extra electrons at a site is considered. The simplification is achieved by introducing operators for one-electron sites and two-electron sites as independent entities. A simple modeling function for the ground state of the system is constructed. Linear and quadratic lattices are considered. For a quadratic lattice the existence of a critical temperature is shown.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 15:12:10 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 00:16:22 GMT" } ]
2008-01-11T00:00:00
[ [ "Voroshilov", "Valentin", "" ] ]
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712.3998
Mark Israelit
Mark Israelit
About Torsional Weyl-Dirac Electrodynamics
3pages. A short version of the paper in arXiv:0712.4044 Contribution to the 8-th Marcel Grossmann Meeting
Proceedings of the 8-th Marcel Grossmann Meeting (Pirani and Ruffini Ed-s) (World Scientific, Singapore, 1999) p.653
null
null
gr-qc
null
A classical general relativistic theory possessing magnetic currents, as well electric ones and admitting massive photons was built up. As the geometric basis serves a space with Weylian non-metricity and torsion. The theory is coordinate covariant as well Weyl-gauge covariant. In the limit one obtains the ordinary Einstein-Maxwell theory.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 15:46:04 GMT" } ]
2007-12-27T00:00:00
[ [ "Israelit", "Mark", "" ] ]
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712.3999
Remigiusz Augusiak
Pawel Horodecki, Remigiusz Augusiak
On quantum cryptography with bipartite bound entangled states
10 pages, no figures
Quantum Information Processing: From Theory to Experiment, D.G. Angelakis et al. (eds.), NATO Science Series III - vol. 199, pp. 19-29., IOS Press, Amsterdam, 2006
null
null
quant-ph
null
Recently the explicit applicability of bound entanglement in quantum cryptography has been shown. In this paper some of recent results respecting this topic are reviewed. In particular relevant notions and definitions are reminded. The new construction of bound entangled states containing secure correlations is presented. It provides low dimensional 6\otimes6 bound entangled states with nonzero distillable key.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 12:33:51 GMT" } ]
2007-12-27T00:00:00
[ [ "Horodecki", "Pawel", "" ], [ "Augusiak", "Remigiusz", "" ] ]
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712.4
Baskar Balasubramanyam
B. Balasubramanyam, M. Longo
$\Lambda$-adic modular symbols and several variable $p$-adic L-functions over totally real fields
null
null
null
null
math.NT
null
We interpolate cohomology classes attached to families of Hilbert modular forms. Using this we construct a two variable $p$-adic L-function which interpolates one variable $p$-adic L-functions.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 12:38:19 GMT" } ]
2007-12-27T00:00:00
[ [ "Balasubramanyam", "B.", "" ], [ "Longo", "M.", "" ] ]
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712.4001
Marat Akhmet
M.U. Akhmet, G.A. Bekmukhambetova
A ptototype compartmental model of blood pressure distribution
23 pages, 2 figures
null
null
null
q-bio.TO
null
We consider a system of differential equations the behavior of which solutions possesses several properties characteristic of the blood pressure distribution. The system can be used for a compartmental modeling of the cardiovascular system. It admits a unique bounded solution such that all coordinates of the solution are separated from zero by positive numbers, and which is periodic, eventually periodic or almost periodic depending on the moments of heart contraction. Appropriate numerical simulations are provided.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 12:51:20 GMT" } ]
2007-12-27T00:00:00
[ [ "Akhmet", "M. U.", "" ], [ "Bekmukhambetova", "G. A.", "" ] ]
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712.4002
Angelo B. Mingarelli
Angelo B. Mingarelli
On the irrationality of Ramanujan's mock theta functions and other q-series at an infinite number of points
Preprint, Dec. 24, 2007: 11 pages
null
null
null
math.NT math.CA
null
We show that all of Ramanujan's mock theta functions of order 3, Watson's three additional mock theta functions of order 3, the Rogers-Ramanujan q-series, and 6 mock theta functions of order 5 take on irrational values at the points q=\pm 1/2,\pm 1/3,\pm 1/4,...
[ { "version": "v1", "created": "Mon, 24 Dec 2007 13:21:55 GMT" } ]
2007-12-27T00:00:00
[ [ "Mingarelli", "Angelo B.", "" ] ]
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712.4003
Andreas Doering
Andreas Doering
Topos theory and `neo-realist' quantum theory
22 pages, no figures; contribution for Proceedings of workshop "Recent Developments in Quantum Field Theory", MPI MIS Leipzig, July 2007
In Quantum Field Theory, Competitive Models, eds. B. Fauser, J. Tolksdorf, E. Zeidler, 25-47, Birkhaeuser (2009)
10.1007/978-3-7643-8736-5_2
null
quant-ph
null
Topos theory, a branch of category theory, has been proposed as mathematical basis for the formulation of physical theories. In this article, we give a brief introduction to this approach, emphasising the logical aspects. Each topos serves as a `mathematical universe' with an internal logic, which is used to assign truth-values to all propositions about a physical system. We show in detail how this works for (algebraic) quantum theory.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 14:04:38 GMT" } ]
2015-05-13T00:00:00
[ [ "Doering", "Andreas", "" ] ]
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712.4004
Mohammad Reza Setare
M R Setare
Holographic Chaplygin DGP cosmologies
9 pages, no figure. To appear in Int. J. Mod. Phys. D
Int.J.Mod.Phys.D18:419-427,2009
10.1142/S0218271809014558
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the present paper, we present an extra dimensions inspired model that is built on the DGP brane-world scenario, then we take the dark energy component on the brane to be a Chaplygin gas. After that we consider a holographic model of Chaplygin gas in the framework of DGP cosmology. We show that the holographic Chaplygin gas can mimic a phantom fluid and cross the phantom divide in a DGP brane-world setup.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 14:16:15 GMT" }, { "version": "v2", "created": "Wed, 10 Sep 2008 13:28:33 GMT" } ]
2009-05-12T00:00:00
[ [ "Setare", "M R", "" ] ]
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712.4005
Laurent Bartholdi
Laurent Bartholdi, Floriane Pochon
On growth and torsion of groups
10 pages
Groups Geom. Dyn. 3 (2009), no. 4, 525--539
10.4171/GGD/68
null
math.GR
null
We give a subexponential upper bound and a superpolynomial lower bound on the growth function of the Fabrykowski-Gupta group. As a consequence, we answer negatively a question by Longobardi, Maj and Rhemtulla about characterizing groups containing no free subsemigroups on two generators.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 14:22:34 GMT" } ]
2016-06-28T00:00:00
[ [ "Bartholdi", "Laurent", "" ], [ "Pochon", "Floriane", "" ] ]
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712.4006
Vince Vatter
Vincent Vatter
Small permutation classes
null
Proc. London Math. Soc. 103 (2011), 879--921
10.1112/plms/pdr017
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish a phase transition for permutation classes (downsets of permutations under the permutation containment order): there is an algebraic number $\kappa$, approximately 2.20557, for which there are only countably many permutation classes of growth rate (Stanley-Wilf limit) less than $\kappa$ but uncountably many permutation classes of growth rate $\kappa$, answering a question of Klazar. We go on to completely characterize the possible sub-$\kappa$ growth rates of permutation classes, answering a question of Kaiser and Klazar. Central to our proofs are the concepts of generalized grid classes (introduced herein), partial well-order, and atomicity (also known as the joint embedding property).
[ { "version": "v1", "created": "Mon, 24 Dec 2007 15:15:44 GMT" }, { "version": "v2", "created": "Fri, 14 Mar 2008 14:00:33 GMT" }, { "version": "v3", "created": "Tue, 5 Apr 2016 22:38:17 GMT" } ]
2016-04-07T00:00:00
[ [ "Vatter", "Vincent", "" ] ]
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712.4007
Simon Pustilnik
S.A.Pustilnik (SAO Ras), A.L.Tepliakova (SAO Ras), A.Y.Kniazev (SAAO, SAO Ras)
Study DDO 68: new evidences for galaxy youth
10 pages, 4 figures, 1 table, submitted to Astron.Lett
null
null
null
astro-ph
null
DDO 68 is the second most metal-poor star-forming galaxy (12+log(O/H)=7.14). Its peculiar optical morphology and the data on its HI distribution and kinematics indicate the merger origin. We use the photometry of the SDSS u,g,r,i images of DDO 68 to estimate its stellar population ages. The available H-alpha-images of DDO 68 were used to select several representative regions without nebular emission. The analysis of obtained colours was performed via comparison with the PEGASE2 evolutionary tracks for various star formation (SF) laws, including the two extremes: instantaneous SF and continuous SF with constant SF rate. The (u-g), (g-r) colours derived for all selected regions, are consistent with a few `instantaneous' SF episodes with ages from ~0.05 to ~1Gyr. Combining the fluxes and colours of visible stellar subsystems with PEGASE2 models, we have estimated the total mass of visible stars in DDO 68 of ~2.4x10^7 Mo. This comprises only ~6% of the total galaxy baryonic mass. All available data do not contradict to the option that DDO 68 is a kind of very rare candidate `young' galaxy, whose dominant stellar build-up took place in course of the recent (with the first encounter ~1 Gyr ago) merger of two very gas-rich disks. DDO 68 best approximates on its properties cosmologically young low-mass galaxies.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 15:44:55 GMT" } ]
2007-12-27T00:00:00
[ [ "Pustilnik", "S. A.", "", "SAO Ras" ], [ "Tepliakova", "A. L.", "", "SAO Ras" ], [ "Kniazev", "A. Y.", "", "SAAO,\n SAO Ras" ] ]
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712.4008
Yuan Ping Feng
Y. H. Lu and P. M. He, Y. P. Feng
Graphene on metal surface: gap opening and n-doping
4 pages, 3 figures
null
null
null
cond-mat.mtrl-sci
null
Graphene grown on metal surface, Cu(111), with a boron nitride(BN) buffer layer is studied for the first time. Our first-principles calculations reveal that charge is transferred from the copper substrate to graphene through the BN buffer layer which results in a n-doped graphene in the absence of a gate voltage. More importantly, a gap of 0.2 eV which is comparable to that of a typical narrow gap semicondutor opens just 0.5 eV below the Fermi-level at the Dirac point. The Fermi-level can be easily shifted inside this gap to make graphene a semiconductor which is crucial for graphene-based electronic devices. A graphene based p-n junction can be realized with graphene eptaxially grown on metal surface.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 03:17:28 GMT" } ]
2007-12-27T00:00:00
[ [ "Lu", "Y. H.", "" ], [ "He", "P. M.", "" ], [ "Feng", "Y. P.", "" ] ]
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712.4009
Arkadiy Skopenkov
A. Skopenkov
A two-page disproof of the Borsuk partition conjecture
3+4 pages, in English and in Russian; minor corrections
Mat. Prosveschenie, 17 (2013)
null
null
math.CO math.MG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is presented the simplest known disproof of the Borsuk conjecture stating that if a bounded subset of n-dimensional Euclidean space contains more than n points, then the subset can be partitioned into n+1 nonempty parts of smaller diameter. The argument is due to N. Alon and is a remarkable application of combinatorics and algebra to geometry. This note is purely expository and is accessible for students.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 17:47:44 GMT" }, { "version": "v2", "created": "Sun, 4 Dec 2011 12:12:47 GMT" }, { "version": "v3", "created": "Fri, 22 Nov 2013 12:14:05 GMT" } ]
2018-10-02T00:00:00
[ [ "Skopenkov", "A.", "" ] ]
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712.401
Michael Schmitt
Ayres Freitas, Caroline Milstene, Michael Schmitt and Andre Sopczak
A Method for the Precision Mass Measurement of the Stop Quark at the International Linear Collider
41 pages, 14 figures, in JHEP format
JHEP 0809:076,2008
10.1088/1126-6708/2008/09/076
ANL-HEP-PR-07-107, FERMILAB-PUB-07-185-E, NUHEP-EXP/07-02, ZH-TH 15/07
hep-ph hep-ex
null
Many supersymmetric models predict new particles within the reach of the next generation of colliders. For an understanding of the model structure and the mechanism(s) of symmetry breaking, it is important to know the masses of the new particles precisely. In this article the measurement of the mass of the scalar partner of the top quark (stop) at an e+e- collider is studied. A relatively light stop is motivated by attempts to explain electroweak baryogenesis and can play an important role in dark matter relic density. A method is presented which makes use of cross-section measurements near the pair-production threshold as well as at higher center-of-mass energies. It is shown that this method not only increases the statistical precision, but also greatly reduces the systematic uncertainties, which can be important. Numerical results are presented, based on a realistic event simulation, for two signal selection strategies: using conventional selection cuts, and using an Iterative Discriminant Analysis (IDA). Our studies indicate that a precision of $\Delta\mstop = 0.42$ GeV can be achieved, representing a major improvement over previous studies. While the analysis of stops is particularly challenging due to the possibility of stop hadronization, the general procedure could be applied to the mass measurement of other particles as well. We also comment on the potential of the IDA to discover a stop quark in this scenario, and we revisit the accuracy of the theoretical predictions for the neutralino relic density
[ { "version": "v1", "created": "Tue, 25 Dec 2007 23:24:49 GMT" } ]
2009-04-30T00:00:00
[ [ "Freitas", "Ayres", "" ], [ "Milstene", "Caroline", "" ], [ "Schmitt", "Michael", "" ], [ "Sopczak", "Andre", "" ] ]
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712.4011
Giorgio Taricco
Giorgio Taricco
Asymptotic Mutual Information Statistics of Separately-Correlated Rician Fading MIMO Channels
- submitted to the IEEE Transactions on Information Theory on Nov. 19, 2006 - revised and submitted to the IEEE Transactions on Information Theory on Dec. 19, 2007
null
10.1109/TIT.2008.926415
null
cs.IT math.IT
null
Precise characterization of the mutual information of MIMO systems is required to assess the throughput of wireless communication channels in the presence of Rician fading and spatial correlation. Here, we present an asymptotic approach allowing to approximate the distribution of the mutual information as a Gaussian distribution in order to provide both the average achievable rate and the outage probability. More precisely, the mean and variance of the mutual information of the separatelycorrelated Rician fading MIMO channel are derived when the number of transmit and receive antennas grows asymptotically large and their ratio approaches a finite constant. The derivation is based on the replica method, an asymptotic technique widely used in theoretical physics and, more recently, in the performance analysis of communication (CDMA and MIMO) systems. The replica method allows to analyze very difficult system cases in a comparatively simple way though some authors pointed out that its assumptions are not always rigorous. Being aware of this, we underline the key assumptions made in this setting, quite similar to the assumptions made in the technical literature using the replica method in their asymptotic analyses. As far as concerns the convergence of the mutual information to the Gaussian distribution, it is shown that it holds under some mild technical conditions, which are tantamount to assuming that the spatial correlation structure has no asymptotically dominant eigenmodes. The accuracy of the asymptotic approach is assessed by providing a sizeable number of numerical results. It is shown that the approximation is very accurate in a wide variety of system settings even when the number of transmit and receive antennas is as small as a few units.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 16:00:34 GMT" } ]
2016-11-17T00:00:00
[ [ "Taricco", "Giorgio", "" ] ]
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712.4012
Homin Shin
Homin Shin, Mark J. Bowick, Xiangjun Xing
Topological Defects in Spherical Nematics
4 pages, 4 figures
Phys. Rev. Lett. 101, 037802 (2008)
10.1103/PhysRevLett.101.037802
null
cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the organization of topological defects in a system of nematogens confined to the two-dimensional sphere (S^2). We first perform Monte Carlo simulations of a fluid system of hard rods (spherocylinders) living in the tangent plane of S^2. The sphere is adiabatically compressed until we reach a jammed nematic state with maximum packing density. The nematic state exhibits four +1/2 disclinations arrayed on a great circle rather than at the vertices of a regular tetrahedron. This arises from the high elastic anisotropy of the system in which splay (K_1) is far softer than bending (K_3). We also introduce and study a lattice nematic model on S^2 with tunable elastic constants and map out the preferred defect locations as a function of elastic anisotropy. We establish the existence of a one-parameter family of degenerate ground states in the extreme splay-dominated limit K_1/K_3 -> 0. Thus the global defect geometry is controllable by tuning the relative splay to bend modulus.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 16:47:58 GMT" }, { "version": "v2", "created": "Mon, 5 May 2008 21:08:42 GMT" }, { "version": "v3", "created": "Fri, 27 Jun 2008 23:12:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Shin", "Homin", "" ], [ "Bowick", "Mark J.", "" ], [ "Xing", "Xiangjun", "" ] ]
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712.4013
Yuliya Lashko
Yuliya Lashko, Gennady Filippov
How the Pauli principle governs the decay of three-cluster systems
18 pages, 3 figures, 3 tables
Nucl.Phys.A806:124-145,2008
10.1016/j.nuclphysa.2008.03.003
null
nucl-th
null
New approach to the problem of multichannel continuum spectrum of three-cluster systems composed of an s-cluster and two neutrons is suggested based on the discrete representation of a complete basis of allowed states of the multiparticle harmonic oscillator. The structure of the eigenfunctions and behavior of the eigenvalues of the three-cluster norm kernel are analyzed. Classification of the eigenvalues of the three-cluster systems with the help of eigenvalues of the two-body subsystem is suggested. Asymptotic boundary conditions for a three-cluster wave function in the continuum consistent with the requirements of the Pauli principle are established. Such asymptotic behavior corresponds rather to subsequent decay of the three-cluster system than to the so-called "democratic decay" associated with the hyperspherical harmonics. The 3H+n+n configuration of the 5H nucleus is considered in detail.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 16:23:18 GMT" } ]
2008-11-26T00:00:00
[ [ "Lashko", "Yuliya", "" ], [ "Filippov", "Gennady", "" ] ]
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712.4014
Michael Sitko
M. L. Sitko, W. J. Carpenter, R. L. Kimes, J. L. Wilde, D. K. Lynch, R. W. Russell, R. J. Rudy, S. M. Mazuk, C. C. Venturini, R. C. Puetter, C. A. Grady, E. F. Polomski, J. P. Wisniewski, S. M. Brafford, H. B. Hammel, R. B. Perry
Variability of Disk Emission in Pre-Main Sequence and Related Stars. I. HD 31648 and HD 163296 - Isolated Herbig Ae Stars Driving Herbig-Haro Flows
55 pages, 18 figures, 2 tables, Accepted by ApJ
null
10.1086/529003
null
astro-ph
null
Infrared photometry and spectroscopy covering a time span of a quarter century are presented for HD 31648 (MWC 480) and HD 163296 (MWC 275). Both are isolated Herbig Ae stars that exhibit signs of active accretion, including driving bipolar flows with embedded Herbig-Haro (HH) objects. HD 163296 was found to be relatively quiescent photometrically in its inner disk region, with the exception of a major increase in emitted flux in a broad wavelength region centered near 3 microns in 2002. In contrast, HD 31648 has exhibited sporadic changes in the entire 3-13 micron region throughout this span of time. In both stars the changes in the 1-5 micron flux indicate structural changes in the region of the disk near the dust sublimation zone, possibly causing its distance from the star to vary with time. Repeated thermal cycling through this region will result in the preferential survival of large grains, and an increase in the degree of crystallinity. The variability observed in these objects has important consequences for the interpretation of other types of observations. For example, source variability will compromise models based on interferometry measurements unless the interferometry observations are accompanied by nearly-simultaneous photometric data.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 16:30:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Sitko", "M. L.", "" ], [ "Carpenter", "W. J.", "" ], [ "Kimes", "R. L.", "" ], [ "Wilde", "J. L.", "" ], [ "Lynch", "D. K.", "" ], [ "Russell", "R. W.", "" ], [ "Rudy", "R. J.", "" ], [ "Mazuk", "S. M.", "" ], [ "Venturini", "C. C.", "" ], [ "Puetter", "R. C.", "" ], [ "Grady", "C. A.", "" ], [ "Polomski", "E. F.", "" ], [ "Wisniewski", "J. P.", "" ], [ "Brafford", "S. M.", "" ], [ "Hammel", "H. B.", "" ], [ "Perry", "R. B.", "" ] ]
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712.4015
Jayadev Acharya
Sreechakra Goparaju, Jayadev Acharya, Ajoy K. Ray, Jaideva C. Goswami
A Fast Hierarchical Multilevel Image Segmentation Method using Unbiased Estimators
10 pages, 5 figures, submitted to "IEEE Transactions on Pattern Analysis and Machine Intelligence"
null
null
null
cs.CV
null
This paper proposes a novel method for segmentation of images by hierarchical multilevel thresholding. The method is global, agglomerative in nature and disregards pixel locations. It involves the optimization of the ratio of the unbiased estimators of within class to between class variances. We obtain a recursive relation at each step for the variances which expedites the process. The efficacy of the method is shown in a comparison with some well-known methods.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 17:11:56 GMT" } ]
2007-12-27T00:00:00
[ [ "Goparaju", "Sreechakra", "" ], [ "Acharya", "Jayadev", "" ], [ "Ray", "Ajoy K.", "" ], [ "Goswami", "Jaideva C.", "" ] ]
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712.4016
William D. Kirwin
William D. Kirwin and Alejandro Uribe
Theta-functions on the Kodaira-Thurston manifold
29 pages, 1 figure
Trans. Amer. Math. Soc. 362 (2010), no. 2, pages 897 -- 932
null
null
math.DG math.SG
null
The Kodaira--Thurston M manifold is a compact, 4-dimensional nilmanifold which is symplectic and complex but not Kaehler. We describe a construction of theta-functions associated to M which parallels the classical theory of theta-functions associated to the torus (from the point of view of representation theory and geometry), and yields pseudoperiodic complex-valued functions on R^4. There exists a three-step nilpotent Lie group G which acts transitively on the Kodaira--Thurston manifold M in a Hamiltonian fashion. The theta-functions discussed in this paper are intimately related to the representation theory of G in much the same way the classical theta-functions are related to the Heisenberg group. One aspect of our results which has not appeared in the classical theory is a connection between the representation theory of G and the existence of Lagrangian and special Lagrangian foliations and torus fibrations in M.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 18:11:43 GMT" } ]
2012-10-19T00:00:00
[ [ "Kirwin", "William D.", "" ], [ "Uribe", "Alejandro", "" ] ]
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712.4017
Emilio Elizalde
G. Cognola, E. Elizalde, S. Nojiri, S.D. Odintsov, L. Sebastiani, and S. Zerbini
Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
15 pages, 2 figures, version to appear in Physical Review D
Phys.Rev.D77:046009,2008
10.1103/PhysRevD.77.046009
null
hep-th astro-ph gr-qc
null
A general approach to viable modified $f(R)$ gravity is developed in both the Jordan and the Einstein frames. A class of exponential, realistic modified gravities is introduced and investigated with care. Special focus is made on step-class models, most promising from the phenomenological viewpoint and which provide a natural way to classify all viable modified gravities. One- and two-steps models are explicitly considered, but the analysis is extensible to $N$-step models. Both inflation in the early universe and the onset of recent accelerated expansion arise in these models in a natural, unified way. Moreover, it is demonstrated that models in this category easily pass all local tests, including stability of spherical body solution, non-violation of Newton's law, and generation of a very heavy positive mass for the additional scalar degree of freedom.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 18:06:55 GMT" }, { "version": "v2", "created": "Wed, 30 Jan 2008 10:56:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Cognola", "G.", "" ], [ "Elizalde", "E.", "" ], [ "Nojiri", "S.", "" ], [ "Odintsov", "S. D.", "" ], [ "Sebastiani", "L.", "" ], [ "Zerbini", "S.", "" ] ]
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712.4018
Alberto C. de la Torre
Dardo M. Goyeneche and Alberto C. de la Torre
State determination: an iterative algorithm
11 pages 3 figures
Phys. Rev. A 77, 042116 (2008).
10.1103/PhysRevA.77.042116
null
quant-ph
null
An iterative algorithm for state determination is presented that uses as physical input the probability distributions for the eigenvalues of two or more observables in an unknown state $\Phi$. Starting form an arbitrary state $\Psi_{0}$, a succession of states $\Psi_{n}$ is obtained that converges to $\Phi$ or to a Pauli partner. This algorithm for state reconstruction is efficient and robust as is seen in the numerical tests presented and is a useful tool not only for state determination but also for the study of Pauli partners. Its main ingredient is the Physical Imposition Operator that changes any state to have the same physical properties, with respect to an observable, of another state.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 18:13:46 GMT" } ]
2008-04-28T00:00:00
[ [ "Goyeneche", "Dardo M.", "" ], [ "de la Torre", "Alberto C.", "" ] ]
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712.4019
Hiroaki Sugiyama
A.G. Akeroyd (Taiwan, Natl. Cheng Kung U.), Mayumi Aoki (Tokyo U., ICRR), Hiroaki Sugiyama (SISSA, Trieste)
Probing Majorana Phases and Neutrino Mass Spectrum in the Higgs Triplet Model at the LHC
1+19 pages, 22 figures, typos corrected, references added, version to appear in Phys. Rev. D
Phys.Rev.D77:075010,2008
10.1103/PhysRevD.77.075010
SISSA-99-2007-EP
hep-ph
null
Doubly charged Higgs bosons (H^++) are a distinctive signature of the Higgs Triplet Model of neutrino mass generation. If H^++ is relatively light (m_{H^++} < 400GeV) it will be produced copiously at the LHC, which could enable precise measurements of the branching ratios of the decay channels H^++ to l_i l_j. Such branching ratios are determined solely by the neutrino mass matrix which allows the model to be tested at the LHC. We quantify the dependence of the leptonic branching ratios on the absolute neutrino mass and Majorana phases, and present the permitted values for the channels ee, emu and mumu. It is shown that precise measurements of these three branching ratios are sufficient to extract information on the neutrino mass spectrum and probe the presence of CP violation from Majorana phases.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 18:44:14 GMT" }, { "version": "v2", "created": "Tue, 25 Mar 2008 13:22:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Akeroyd", "A. G.", "", "Taiwan, Natl. Cheng Kung U." ], [ "Aoki", "Mayumi", "", "Tokyo U.,\n ICRR" ], [ "Sugiyama", "Hiroaki", "", "SISSA, Trieste" ] ]
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712.402
Yakov Kopelevich
Yakov Kopelevich and Pablo Esquinazi
Graphene Physics in Graphite
9 pages including 2 figures, correction of typos
Adv. Mater. 19, 4559 (2007)
10.1002/adma.200702051
null
cond-mat.mtrl-sci cond-mat.str-el
null
Single layers of carbon dubbed "graphenes", from which graphite is built, have attracted broad interest in the scientific community because of recent exciting experimental results. Graphene is interesting from a fundamental research perspective, as well as for potential technological applications. Here, we provide a brief overview of recent developments in this field, focusing especially on the electronic properties of graphite. Experimental evidence indicates that high-quality graphite is a multi-layer system with nearly decoupled 2D graphene planes. Based on experimental observations, we anticipate that thin graphite samples and not single layers will be the most promising candidates for graphene-based electronics.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 18:32:53 GMT" }, { "version": "v2", "created": "Sat, 5 Jan 2008 08:58:36 GMT" } ]
2008-01-05T00:00:00
[ [ "Kopelevich", "Yakov", "" ], [ "Esquinazi", "Pablo", "" ] ]
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712.4021
Tyler J. Jarvis
Huijun Fan, Tyler J. Jarvis, Yongbin Ruan
The Witten equation, mirror symmetry and quantum singularity theory
To appear in Annals of Mathematics. Includes resolution of the Witten ADE integrable hierarchies conjecture and Witten's ADE self-mirror conjecture. Several corrections and clarifications
null
null
null
math.AG hep-th math-ph math.MP math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For any non-degenerate, quasi-homogeneous hypersurface singularity, we describe a family of moduli spaces, a virtual cycle, and a corresponding cohomological field theory associated to the singularity. This theory is analogous to Gromov-Witten theory and generalizes the theory of r-spin curves, which corresponds to the simple singularity A_{r-1}. We also resolve two outstanding conjectures of Witten. The first conjecture is that ADE-singularities are self-dual; and the second conjecture is that the total potential functions of ADE-singularities satisfy corresponding ADE-integrable hierarchies. Other cases of integrable hierarchies are also discussed.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 20:18:06 GMT" }, { "version": "v2", "created": "Sun, 11 Jan 2009 03:49:11 GMT" }, { "version": "v3", "created": "Thu, 29 Jan 2009 05:59:18 GMT" }, { "version": "v4", "created": "Thu, 26 Jul 2012 14:35:23 GMT" } ]
2012-07-27T00:00:00
[ [ "Fan", "Huijun", "" ], [ "Jarvis", "Tyler J.", "" ], [ "Ruan", "Yongbin", "" ] ]
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712.4022
Mikhail Erementchouk
Mikhail Erementchouk, Michael N. Leuenberger
Rabi oscillations in semiconductor multi-wave mixing response
18 pages, 5 figures
Phys. Rev. B 78, 075206 (2008)
10.1103/PhysRevB.78.075206
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We studied the semiconductor response with respect to high intensity resonant excitation on short time scale when the contribution of the Fermi statistics of the electrons and holes prevails. We studied both the single and double pulse excitations. For the latter case we considered the time evolution of the multi-wave mixing exciton polarization. The main difference between the excitation by a single pulse or by two non-collinear pulses is that the Rabi oscillations of the multi-wave mixing response are characterized by two harmonics. Analyzing the operator dynamics governed by the external excitation we found that there are three invariant spin classes, which do not mix with the evolution of the system. Two classes correspond to the bright exciton states and one contains all dark states. We found that the dynamics of the classes is described by six frequencies and the Rabi frequencies are only two of them (one for each bright class). We discuss the effect of the dispersion of the electrons and holes and the Coulomb interaction describing the semiconductor by the semiconductor Bloch equation (SBE). We show that if initially the system is in the ground state then the SBE preserves the invariant spin classes thus proving absence of the dark excitons in the framework of this description. We found that due to the mass difference between holes of different kind additional Rabi frequencies, two of those present in the operator dynamics, should appear in the evolution of the exciton polarization.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 18:53:20 GMT" }, { "version": "v2", "created": "Sat, 7 Jun 2008 13:19:48 GMT" } ]
2009-10-15T00:00:00
[ [ "Erementchouk", "Mikhail", "" ], [ "Leuenberger", "Michael N.", "" ] ]
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712.4023
Suk-Jin Yoon
Suk-Jin Yoon, Seok-Joo Joo, Chang H. Ree, Sang-Il Han, Do-Gyun Kim, and Young-Wook Lee
On the Origin of Bimodal Horizontal-Branches in Massive Globular Clusters: The Case of NGC 6388 and NGC 6441
Accepted in ApJ, 33 pages, 5 figures, 4 tables
null
10.1086/533510
null
astro-ph
null
Despite the efforts of the past decade, the origin of the bimodal horizontal-branch (HB) found in some globular clusters (GCs) remains a conundrum. Inspired by the discovery of multiple stellar populations in the {\it most massive} Galactic GC, $\omega$ Centauri, we investigate the possibility that two distinct populations may coexist and are responsible for the bimodal HBs in the {\it third} and {\it fifth} brightest GCs, NGC 6388 and NGC 6441. Using the population synthesis technique, we examine two different chemical ``self-enrichment'' hypotheses in which a primordial GC was sufficiently massive to contain two or more distinct populations as suggested by the populations found in $\omega$ Cen: (1) the age-metallicity relation scenario in which two populations with different metallicity and age coexist, following an internal age-metallicity relation, and (2) the super-helium-rich scenario in which GCs contain a certain fraction of helium-enhanced stars, for instance, the second generation stars formed from the helium-enriched ejecta of the first. The comparative study indicates that the detailed color-magnitude diagram morphologies and the properties of the RR Lyrae variables in NGC 6388 and NGC 6441 support the latter scenario; i.e., the model which assumes a minor fraction ($\sim$ 15 %) of helium-excess (Y $\simeq$ 0.3) stars. The results suggest that helium content is the main driver behind the HB bimodality found most often in massive GCs. If confirmed, the GC-to-GC variation of helium abundance should be considered a {\it local} effect, further supporting the argument that age is the {\it global} second parameter of HB morphology.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 18:41:54 GMT" } ]
2009-11-13T00:00:00
[ [ "Yoon", "Suk-Jin", "" ], [ "Joo", "Seok-Joo", "" ], [ "Ree", "Chang H.", "" ], [ "Han", "Sang-Il", "" ], [ "Kim", "Do-Gyun", "" ], [ "Lee", "Young-Wook", "" ] ]
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712.4024
Maja Buric
Maja Buric, John Madore and George Zoupanos
WKB Approximation in Noncommutative Gravity
This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 3:125,2007
10.3842/SIGMA.2007.125
null
hep-th
null
We consider the quasi-commutative approximation to a noncommutative geometry defined as a generalization of the moving frame formalism. The relation which exists between noncommutativity and geometry is used to study the properties of the high-frequency waves on the flat background.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 19:49:48 GMT" } ]
2008-12-19T00:00:00
[ [ "Buric", "Maja", "" ], [ "Madore", "John", "" ], [ "Zoupanos", "George", "" ] ]
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712.4025
Tyler J. Jarvis
Huijun Fan, Tyler J. Jarvis, Yongbin Ruan
The Witten equation and its virtual fundamental cycle
Major revision. Additional axioms proved and additional details provided over previous version
null
null
null
math.AG hep-th math-ph math.AP math.MP math.SG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a system of nonlinear elliptic PDEs associated with a quasi-homogeneous polynomial. These equations were proposed by Witten as the replacement for the Cauchy-Riemann equation in the singularity (Landau-Ginzburg) setting. We introduce a perturbation to the equation and construct a virtual cycle for the moduli space of its solutions. Then, we study the wall-crossing of the deformation of the virtual cycle under perturbation and match it to classical Picard-Lefschetz theory. An extended virtual cycle is obtained for the original equation. Finally, we prove that the extended virtual cycle satisfies a set of axioms similar to those of Gromov-Witten theory and r-spin theory.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 20:07:52 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 06:07:57 GMT" }, { "version": "v3", "created": "Fri, 15 Apr 2011 23:05:28 GMT" } ]
2011-04-19T00:00:00
[ [ "Fan", "Huijun", "" ], [ "Jarvis", "Tyler J.", "" ], [ "Ruan", "Yongbin", "" ] ]
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712.4026
Charles Li
Y. Charles Li
Chaos in Partial Differential Equations, Navier-Stokes Equations and Turbulence
null
Y. Charles Li. Proceedings of the 4th International Congress of Chinese Mathematicians, (Hangzhou, December 17-22, 2007), vol. III, 110-122, Higher Education Press, Beijing, China
null
null
math.AP math-ph math.DS math.MP nlin.CD physics.flu-dyn
null
I will briefly survey the most important results obtained so far on chaos in partial differential equations. I will also survey progresses and make some comments on Navier-Stokes equations and turbulence.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 20:08:54 GMT" } ]
2007-12-28T00:00:00
[ [ "Li", "Y. Charles", "" ] ]
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712.4027
Olga Holtz
James Demmel, Ioana Dumitriu, Olga Holtz, Plamen Koev
Accurate and Efficient Expression Evaluation and Linear Algebra
49 pages, 6 figures, 1 table
Acta Numerica, Volume 17, May 2008, pp 87-145
10.1017/S0962492906350015
null
math.NA cs.CC cs.DS math.RA
null
We survey and unify recent results on the existence of accurate algorithms for evaluating multivariate polynomials, and more generally for accurate numerical linear algebra with structured matrices. By "accurate" we mean that the computed answer has relative error less than 1, i.e., has some correct leading digits. We also address efficiency, by which we mean algorithms that run in polynomial time in the size of the input. Our results will depend strongly on the model of arithmetic: Most of our results will use the so-called Traditional Model (TM). We give a set of necessary and sufficient conditions to decide whether a high accuracy algorithm exists in the TM, and describe progress toward a decision procedure that will take any problem and provide either a high accuracy algorithm or a proof that none exists. When no accurate algorithm exists in the TM, it is natural to extend the set of available accurate operations by a library of additional operations, such as $x+y+z$, dot products, or indeed any enumerable set which could then be used to build further accurate algorithms. We show how our accurate algorithms and decision procedure for finding them extend to this case. Finally, we address other models of arithmetic, and the relationship between (im)possibility in the TM and (in)efficient algorithms operating on numbers represented as bit strings.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 20:14:50 GMT" } ]
2008-05-21T00:00:00
[ [ "Demmel", "James", "" ], [ "Dumitriu", "Ioana", "" ], [ "Holtz", "Olga", "" ], [ "Koev", "Plamen", "" ] ]
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712.4028
Francesca Sammarruca
Francesca Sammarruca
The mean free path of protons and neutrons in isospin-asymmetric nuclear matter
Revised, extended, 9 pages, 4 figures
Phys.Rev.C77:047301,2008
10.1103/PhysRevC.77.047301
null
nucl-th
null
We calculate the mean free path of protons and neutrons in symmetric and asymmetric nuclear matter, based on microscopic in-medium nucleon-nucleon cross sections. Those are obtained from calculations of the G-matrix including relativistic "Dirac" effects. The dependence of the mean free path on energy and isospin asymmetry is discussed. We conclude by suggesting possible ways our microscopic predictions may be helpful in conjunction with studies of rare isotopes.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 20:24:53 GMT" }, { "version": "v2", "created": "Wed, 5 Mar 2008 03:37:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Sammarruca", "Francesca", "" ] ]
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712.4029
Frank G. Borg
Frank G. Borg, Ismo Hakala and Jukka M\"a\"att\"al\"a
Elements of Radio Waves
94 pages with 29 figures of which 6 are postscript figures and the rest are made using eepic. BibTex bibliography
null
null
null
physics.gen-ph
null
We present a summary of the basic properties of the radio wave generation, propagation and reception, with a special attention to the gigahertz bandwidth region which is of interest for wireless sensor networks. We also present some measurement results which use the so-called RSSI indicator in order to track how the field strength varies with position and distance of the transceivers. We hope the paper may be useful to anyone who looks for a quick review of the fundamentals of electromagnetic theory with application to antennas.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 21:21:40 GMT" } ]
2007-12-27T00:00:00
[ [ "Borg", "Frank G.", "" ], [ "Hakala", "Ismo", "" ], [ "Määttälä", "Jukka", "" ] ]
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712.403
Heinz Bauschke
Heinz H. Bauschke, Xianfu Wang, Jane Ye, Xiaoming Yuan
Bregman distances and Chebyshev sets
null
null
null
null
math.FA
null
A closed set of a Euclidean space is said to be Chebyshev if every point in the space has one and only one closest point in the set. Although the situation is not settled in infinite-dimensional Hilbert spaces, in 1932 Bunt showed that in Euclidean spaces a closed set is Chebyshev if and only if the set is convex. In this paper, from the more general perspective of Bregman distances, we show that if every point in the space has a unique nearest point in a closed set, then the set is convex. We provide two approaches: one is by nonsmooth analysis; the other by maximal monotone operator theory. Subdifferentiability properties of Bregman nearest distance functions are also given.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 21:23:25 GMT" } ]
2007-12-27T00:00:00
[ [ "Bauschke", "Heinz H.", "" ], [ "Wang", "Xianfu", "" ], [ "Ye", "Jane", "" ], [ "Yuan", "Xiaoming", "" ] ]
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712.4031
Cesar Hidalgo
Cesar A. Hidalgo, C. Rodriguez-Sickert
The Dynamics of a Mobile Phone Network
null
Hidalgo CA, Rodriguez-Sickert C, The dynamics of a mobile phone network, Physica A (2008),
10.1016/j.physa.2008.01.073
null
physics.soc-ph
null
The empirical study of network dynamics has been limited by the lack of longitudinal data. Here we introduce a quantitative indicator of link persistence to explore the correlations between the structure of a mobile phone network and the persistence of its links. We show that persistent links tend to be reciprocal and are more common for people with low degree and high clustering. We study the redundancy of the associations between persistence, degree, clustering and reciprocity and show that reciprocity is the strongest predictor of tie persistence. The method presented can be easily adapted to characterize the dynamics of other networks and can be used to identify the links that are most likely to survive in the future.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 21:32:21 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 01:51:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Hidalgo", "Cesar A.", "" ], [ "Rodriguez-Sickert", "C.", "" ] ]
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712.4032
Rosena Du
Rosena R.X. Du and Jingbin Yin
Counting Labelled Trees with Given Indegree Sequence
10 pages
null
null
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a labelled tree on the vertex set $[n]:=\{1,2,..., n\}$, define the direction of each edge $ij$ to be $i\to j$ if $i<j$. The indegree sequence of $T$ can be considered as a partition $\lambda \vdash n-1$. The enumeration of trees with a given indegree sequence arises in counting secant planes of curves in projective spaces. Recently Ethan Cotterill conjectured a formula for the number of trees on $[n]$ with indegree sequence corresponding to a partition $\lambda$. In this paper we give two proofs of Cotterill's conjecture: one is `semi-combinatorial" based on induction, the other is a bijective proof.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 21:43:41 GMT" }, { "version": "v2", "created": "Thu, 2 Apr 2009 15:45:29 GMT" } ]
2009-04-02T00:00:00
[ [ "Du", "Rosena R. X.", "" ], [ "Yin", "Jingbin", "" ] ]
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712.4033
Charles M. Marcus
D. J. Reilly, J. M. Taylor, E. A. Laird, J. R. Petta, C. M. Marcus, M. P. Hanson and A. C. Gossard
Measurement of Temporal Correlations of the Overhauser Field in a Double Quantum Dot
related papers available at http://marcuslab.harvard.edu
Phys. Rev. Lett. 101, 236803 (2008).
10.1103/PhysRevLett.101.236803
null
cond-mat.mes-hall cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In quantum dots made from materials with nonzero nuclear spins, hyperfine coupling creates a fluctuating effective Zeeman field (Overhauser field) felt by electrons, which can be a dominant source of spin qubit decoherence. We characterize the spectral properties of the fluctuating Overhauser field in a GaAs double quantum dot by measuring correlation functions and power spectra of the rate of singlet-triplet mixing of two separated electrons. Away from zero field, spectral weight is concentrated below 10 Hz, with 1/f^2 dependence on frequency, f. This is consistent with a model of nuclear spin diffusion, and indicates that decoherence can be largely suppressed by echo techniques.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 21:47:11 GMT" }, { "version": "v2", "created": "Sat, 26 Apr 2008 21:35:03 GMT" }, { "version": "v3", "created": "Mon, 20 Oct 2008 04:33:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Reilly", "D. J.", "" ], [ "Taylor", "J. M.", "" ], [ "Laird", "E. A.", "" ], [ "Petta", "J. R.", "" ], [ "Marcus", "C. M.", "" ], [ "Hanson", "M. P.", "" ], [ "Gossard", "A. C.", "" ] ]
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712.4034
M. Haghighat
M. M. Ettefaghi, M. Haghighat
Massive Neutrino in Non-commutative Space-time
14 pages, 1 figure, to appear in Phys. Rev. D
Phys.Rev.D77:056009,2008
10.1103/PhysRevD.77.056009
null
hep-ph astro-ph hep-th
null
We consider the noncommutative standard model based on $SU(3)\times SU(2)\times U(1)$. We study the gauge transformation of right handed neutrino and its direct interaction with photon in the noncommutative space-time. We show that the massive Dirac neutrinos, through the Higgs mechanism, can not accommodate this extension of the standard model; while the massive Majorana neutrinos are consistent with the gauge symmetry of the model. The electromagnetic properties and the dispersion relations for the neutrino in the noncommutative standard model is examined. We also compare the results with the noncommutative standard model based on $U(3)\times U(2)\times U(1) $.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 22:00:01 GMT" }, { "version": "v2", "created": "Tue, 1 Apr 2008 14:01:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Ettefaghi", "M. M.", "" ], [ "Haghighat", "M.", "" ] ]
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712.4035
Douglas C. Leonard
Douglas C. Leonard (San Diego State University)
A Supernova Riddle
Invited ``Perspectives'' commentary, published in the January 12, 2007 issue of Science. 5 pages, 1 figure
Science315:193,2007
10.1126/science.1123373
null
astro-ph
null
Analysis of the polarization of light from supernovae can reveal the shape and distribution of matter ejected from exploding stars. Here we review the young field of Type Ia supernova spectropolarimetry and critically evaluate, and place in context, the recent work of Wang et al. (2007, Science, 315, 212) in which a suggestive trend is found in data from 17 Type Ia events.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 22:34:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Leonard", "Douglas C.", "", "San Diego State University" ] ]
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712.4036
Misha Verbitsky
Misha Verbitsky
Plurisubharmonic functions in calibrated geometry and q-convexity
28 pages, reference to Wu and Napier-Ramachandran added
Math. Z., Vol. 264, No. 4, pp. 939-957 (2010)
null
null
math.CV math.DG
null
Let $(M,\omega)$ be a Kahler manifold. An integrable function on M is called $\omega^q$-plurisubharmonic if it is subharmonic on all q-dimensional complex subvarieties. We prove that a smooth $\omega^q$-plurisubharmonic function is q-convex. A continuous $\omega^q$-plurisubharmonic function admits a local approximation by smooth, $\omega^q$-plurisubharmonic functions. For any closed subvariety $Z\subset M$, $\dim Z < q$, there exists a strictly $\omega^q$-plurisubharmonic function in a neighbourhood of $Z$ (this result is known for q-convex functions). This theorem is used to give a new proof of Sibony's lemma on integrability of positive closed (p,p)-forms which are integrable outside of a complex subvariety of codimension >p.
[ { "version": "v1", "created": "Mon, 24 Dec 2007 22:54:34 GMT" }, { "version": "v2", "created": "Thu, 27 Dec 2007 16:38:50 GMT" }, { "version": "v3", "created": "Sat, 12 Jan 2008 13:29:06 GMT" }, { "version": "v4", "created": "Thu, 14 Feb 2008 15:31:28 GMT" } ]
2010-04-01T00:00:00
[ [ "Verbitsky", "Misha", "" ] ]
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712.4037
Jonathan Lee
Franz-Viktor Kuhlmann, Salma Kuhlmann, Jonathan W. Lee
Valuation bases for generalized algebraic series fields
null
Journal of Algebra 322 (2009), 1430-1453
null
null
math.AC math.LO
null
We investigate valued fields which admit a valuation basis. Given a countable ordered abelian group G and a real closed, or algebraically closed field F, we give a sufficient condition for a valued subfield of the field of generalized power series F((G)) to admit a K-valuation basis. We show that the field of rational functions F(G) and the field F(G) of power series in F((G)) algebraic over F(G) satisfy this condition. It follows that for archimedean F and divisible G the real closed field F(G) admits a restricted exponential function.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 09:08:27 GMT" } ]
2013-04-02T00:00:00
[ [ "Kuhlmann", "Franz-Viktor", "" ], [ "Kuhlmann", "Salma", "" ], [ "Lee", "Jonathan W.", "" ] ]
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712.4038
Xiaojun Bi
Xiao-Jun Bi, Juan Zhang, Qiang Yuan
Diffuse $\gamma$-rays and $\bar{p}$ flux from dark matter annihilation -- a model for consistent results with EGRET and cosmic ray data
29 pages, 13 figures; the published version
Phys.Rev.D78:043001,2008
10.1103/PhysRevD.78.043001
null
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we develop a new propagation model for the Galactic cosmic rays based on the GALPROP code, including contributions from dark matter annihilation. The model predicts compatible Galactic diffuse $\gamma$ ray spectra with EGRET data in all sky regions. It also gives consistent results of the diffuse $\gamma$ ray longitude and latitude distributions. Further the results for B/C, $^{10}$Be/$^9$Be, proton, electron and antiproton spectra are also consistent with cosmic ray measurements. In the model we have taken a universal proton spectrum throughout the Galaxy without introducing large fluctuation for the proton energy loss is negligible. The dark matter annihilation signals are `boosted' after taking the contribution from subhalos into account. Another interesting feature of the model is that it gives better description of the diffuse $\gamma$ rays when taking the source distribution compatible with supernova remnants data, which is different from previous studies.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 00:05:36 GMT" }, { "version": "v2", "created": "Wed, 1 Oct 2008 02:55:35 GMT" } ]
2008-11-26T00:00:00
[ [ "Bi", "Xiao-Jun", "" ], [ "Zhang", "Juan", "" ], [ "Yuan", "Qiang", "" ] ]
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712.4039
Thomas Claesson
T. Claesson, M. Mansson, A. \"Onsten, M. Shi, S. Pailh\'es, J. Chang, Y. Sassa, A. Bendounan, L. Patthey, J. Mesot, T. Muro, T. Matsushita, T. Kinoshita, T. Nakamura, N. Momono, M. Oda, M. Ido, O. Tjernberg
The electronic structure of La$_{1.48}$Nd$_{0.4}$Sr$_{0.12}$CuO$_4$ probed by high- and low-energy angle-resolved photoelectron spectroscopy: evolution with probing depth
6 pages, 4 figures
null
null
null
cond-mat.str-el
null
We present angle-resolved photoelectron spectroscopy data probing the electronic structure of the Nd-substituted high-$T_c$ cuprate La$_{1.48}$Nd$_{0.4}$Sr$_{0.12}$CuO$_4$ (Nd-LSCO). Data have been acquired at low and high photon energies, $h\nu$ = 55 and 500 eV, respectively. Earlier comparable low-energy studies of La$_{1.4-x}$Nd$_{0.6}$Sr$_{x}$CuO$_4$ ($x = 0.10, 0.12, 0.15$) have shown strongly suppressed photoemission intensity, or absence thereof, in large parts of the Brillouin zone. Contrary to these findings we observe spectral weight at all points along the entire Fermi surface contour at low and high photon energies. No signs of strong charge modulations are found. At high photon energy, the Fermi surface shows obvious differences in shape as compared to the low-energy results presented here and in similar studies. The observed difference in shape and the high bulk-sensitivity at this photon energy suggest intrinsic electronic structure differences between the surface and bulk regions.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 00:27:27 GMT" } ]
2007-12-27T00:00:00
[ [ "Claesson", "T.", "" ], [ "Mansson", "M.", "" ], [ "Önsten", "A.", "" ], [ "Shi", "M.", "" ], [ "Pailhés", "S.", "" ], [ "Chang", "J.", "" ], [ "Sassa", "Y.", "" ], [ "Bendounan", "A.", "" ], [ "Patthey", "L.", "" ], [ "Mesot", "J.", "" ], [ "Muro", "T.", "" ], [ "Matsushita", "T.", "" ], [ "Kinoshita", "T.", "" ], [ "Nakamura", "T.", "" ], [ "Momono", "N.", "" ], [ "Oda", "M.", "" ], [ "Ido", "M.", "" ], [ "Tjernberg", "O.", "" ] ]
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712.404
Manoj Kumar Singh Dr
Manoj K. Singh, Ram S. Katiyar and J. F. Scott
One-magnon (electromagnon) light scattering in BiFeO3 single crystals
6 pages, 4 figures
null
null
null
cond-mat.mtrl-sci cond-mat.other
null
We observed Raman scattering from magnon in frequency range from 10 to 65 cm-1 in BiFeO3 single crystals at cryogenic temperatures; the temperature dependence of the magnon frequency at 18.2 cm-1 approximates an S=5/2 Brillouin function up to the temperature (280 K) at which the magnon becomes overdamped. The diverging cross-section and the frequency-shift at 140K and 200 K implies a magnon-reorientation transition as in orthoferrites. Magnons in polar materials such as BiFeO3 are often termed electromagnons meaning that they possess an electric dipole moment due to magnetoelectric coupling.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 00:49:22 GMT" }, { "version": "v2", "created": "Mon, 28 Jan 2008 20:23:59 GMT" } ]
2008-01-28T00:00:00
[ [ "Singh", "Manoj K.", "" ], [ "Katiyar", "Ram S.", "" ], [ "Scott", "J. F.", "" ] ]
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712.4041
Preeti Kharb
P. Kharb, M. L. Lister, and P. Shastri
Magnetic Fields in Blazar Pc-scale Jets - Possible connection to Spin Rates of Black holes ?
4 pages, Proceedings of the "High Energy Phenomena in Relativistic Outflows" meeting held in Dublin, Ireland, from Sept 24-28, 2007; to appear in the International Journal of Modern Physics D
Int.J.Mod.Phys.D17:1545-1552,2008
10.1142/S0218271808013133
null
astro-ph
null
We re-examine the differences observed in the pc-scale magnetic field geometry of high and low optical polarization Quasars (HPQs, LPRQs) using the MOJAVE sample. We find that, as previously reported, HPQ jets exhibit predominantly transverse B fields while LPRQ jets tend to display longitudinal B fields. We attempt to understand these results along with the different B field geometry observed in the low and high energy peaked BL Lacs (LBLs, HBLs) using a simple picture wherein the spinning central black holes in these AGNs influence the speed and strength of the jet components (spine, sheath). Higher spin rates in HPQs compared to LPRQs and LBLs compared to HBLs could explain the different total radio powers, VLBI jet speeds, and the observed B field geometry in these AGN classes.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 01:11:17 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 21:16:21 GMT" } ]
2009-06-23T00:00:00
[ [ "Kharb", "P.", "" ], [ "Lister", "M. L.", "" ], [ "Shastri", "P.", "" ] ]
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712.4042
Ye Xu
Ye Xu, Weiwei Xu, Yixiong Meng, Kaien Zhu, Wei Xu
Applying Bayesian Neural Networks to Event Reconstruction in Reactor Neutrino Experiments
9 pages, 3 figures, Accepted by NIMA
Nucl.Instrum.Meth.A592:451-455,2008
10.1016/j.nima.2008.04.006
null
physics.data-an hep-ex physics.ins-det
null
A toy detector has been designed to simulate central detectors in reactor neutrino experiments in the paper. The electron samples from the Monte-Carlo simulation of the toy detector have been reconstructed by the method of Bayesian neural networks (BNN) and the standard algorithm, a maximum likelihood method (MLD), respectively. The result of the event reconstruction using BNN has been compared with the one using MLD. Compared to MLD, the uncertainties of the electron vertex are not improved, but the energy resolutions are significantly improved using BNN. And the improvement is more obvious for the high energy electrons than the low energy ones.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 01:58:54 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 03:25:30 GMT" }, { "version": "v3", "created": "Fri, 2 May 2008 02:28:44 GMT" } ]
2011-05-05T00:00:00
[ [ "Xu", "Ye", "" ], [ "Xu", "Weiwei", "" ], [ "Meng", "Yixiong", "" ], [ "Zhu", "Kaien", "" ], [ "Xu", "Wei", "" ] ]
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712.4043
Shoichi Ichinose
Shoichi Ichinose
Casimir and Vacuum Energy of 5D Warped System and Sphere Lattice Regularization
Proceedings of ICGA8, 4 pages, 3 figures
null
null
US-07-04
hep-th
null
We examine the Casimir energy of 5D electro-magnetism in the recent standpoint. Z$_2$ symmetry is taken into account. After confirming the consistency with the past result, we do new things based on a new regularization. The regularization is based on the minimal area principle and the regularized configuration is the {\it sphere lattice}. We do it not in the Kaluza-Klein expanded form but in the closed form. The formalism is based on the heat-kernel approach using the position/momentum propagator. A useful expression of the Casimir energy, in terms of the P/M propagator, is obtained. Renormalization flow is realized as the change along the extra-axis.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 02:02:25 GMT" } ]
2007-12-27T00:00:00
[ [ "Ichinose", "Shoichi", "" ] ]
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712.4044
Mark Israelit
Mark Israelit
Torsional Weyl-Dirac Electrodinamics
22 pages no figures
Found.Phys.28:205-229,1998
10.1023/A:1018700819298
null
gr-qc
null
Issuing from a geometry with nonmetricity and torsion we build up a classical theory of gravitation and electromagnetism. The theory is coordinate covariant as well Weyl-gauge covariant. Massless and massive photons, intrinsic electr. and magn. currents exist in this framework. The field EQ-s and EQ-s of motion are derived from a geometrically based action. It is shown that the magn.-magn. interaction is transmitted by massive photons. A magn. charge (monopole) cannot be located together with an electr. one. In absence of torsion and in the Einstein gauge one obtains the Einstein-Maxwell theory.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 15:09:41 GMT" } ]
2008-11-26T00:00:00
[ [ "Israelit", "Mark", "" ] ]
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712.4045
Oleg I. Berngardt
O. I. Berngardt
On two approaches to the building of local models for electron density based on Irkutsk digizond data
9 pages, 4 figures, 1 table
null
null
null
physics.geo-ph physics.ao-ph physics.data-an physics.plasm-ph
null
In the paper the step-by-step principles for making local model of electron density are described. They are based on modulation principle - electron density dependence on time is a product of a number of temporal variations caused by solar radiation, magnetic activity, Earth orientation and unknown additional periodical processes (not a sum, as they suppose sometimes when making such models). A multiranges modulation principle is also suggested, that allows automatically extend the set of parameters by using new ones, obtained by filtration (or averaging) of basic set of parameters over the time. In the paper we describe two approaches to the model creation - descriptional and predictional ones. To test the approach three different models were created for daily electron density logarithm using the described principles. We have used the data of Irkutsk digisonde over the period 2003-2007 years for testing. It becomes clear that a non-optimal choice of the number of model parameters could increase prediction error, inspite the error over the set, used for analysis, will decrease. It is shown that one year prediction has accuracy about 9-23% depending on the height, and the highest error corresponds to the height about 200km. From the modelling we could also see that with increasing of the height the number of parameters increases, and this could be caused by inaccuracy of the model or by not taking additional physical mechanisms into consideration.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 02:55:38 GMT" } ]
2007-12-27T00:00:00
[ [ "Berngardt", "O. I.", "" ] ]
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712.4046
David Harvey
David Harvey
Faster polynomial multiplication via multipoint Kronecker substitution
14 pages, 4 figures
null
null
null
cs.SC cs.DS
null
We give several new algorithms for dense polynomial multiplication based on the Kronecker substitution method. For moderately sized input polynomials, the new algorithms improve on the performance of the standard Kronecker substitution by a sizeable constant, both in theory and in empirical tests.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 04:57:04 GMT" } ]
2007-12-27T00:00:00
[ [ "Harvey", "David", "" ] ]
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712.4047
Yositake Takane
Yositake Takane
Asymptotic behavior of the conductance in disordered wires with perfectly conducting channels
20 pages, 1 figure
J. Phys. Soc. Jpn. 77 (2008) 014703
10.1143/JPSJ.77.014703
null
cond-mat.mes-hall
null
We study the conductance of disordered wires with unitary symmetry focusing on the case in which $m$ perfectly conducting channels are present due to the channel-number imbalance between two-propagating directions. Using the exact solution of the Dorokhov-Mello-Pereyra-Kumar (DMPK) equation for transmission eigenvalues, we obtain the average and second moment of the conductance in the long-wire regime. For comparison, we employ the three-edge Chalker-Coddington model as the simplest example of channel-number-imbalanced systems with $m = 1$, and obtain the average and second moment of the conductance by using a supersymmetry approach. We show that the result for the Chalker-Coddington model is identical to that obtained from the DMPK equation.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 05:15:38 GMT" } ]
2015-05-13T00:00:00
[ [ "Takane", "Yositake", "" ] ]
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712.4048
Michael Uleysky
M. Yu. Uleysky, M. V. Budyansky, S. V. Prants
Unstable periodic orbits in a chaotic meandering jet flow
null
Journal of Physics A. 2008. V.41. Art 215102
10.1088/1751-8113/41/21/215102
null
nlin.CD physics.ao-ph
null
We study the origin and bifurcations of typical classes of unstable periodic orbits in a jet flow that was introduced before as a kinematic model of chaotic advection, transport and mixing of passive scalars in meandering oceanic and atmospheric currents. A method to detect and locate the unstable periodic orbits and classify them by the origin and bifurcations is developed. We consider in detail period-1 and period-4 orbits playing an important role in chaotic advection. We introduce five classes of period-4 orbits: western and eastern ballistic ones, whose origin is associated with ballistic resonances of the fourth order, rotational ones, associated with rotational resonances of the second and fourth orders, and rotational-ballistic ones associated with a rotational-ballistic resonance. It is a new kind of nonlinear resonances that may occur in chaotic flow with jets and/or circulation cells. Varying the perturbation amplitude, we track out the origin and bifurcations of the orbits for each class.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 05:17:02 GMT" } ]
2012-05-29T00:00:00
[ [ "Uleysky", "M. Yu.", "" ], [ "Budyansky", "M. V.", "" ], [ "Prants", "S. V.", "" ] ]
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712.4049
Farrukh Mukhamedov M.
Farrukh Mukhamedov, Utkir Rozikov
On one polynomial $p$-adic dynamical system
8 pages, in Russian
null
null
null
math.DS math.NT
null
In the paper we describe basin of attraction and the Siegel discs of the $p$-adic dynamical system $f(x)=x^{2n+1}+ax^{n+1}$ over complex $p$-adic field.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 06:17:25 GMT" } ]
2007-12-27T00:00:00
[ [ "Mukhamedov", "Farrukh", "" ], [ "Rozikov", "Utkir", "" ] ]
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712.405
Takashi Shinzato
Takashi Shinzato and Yoshiyuki Kabashima
Perceptron capacity revisited: classification ability for correlated patterns
null
null
10.1088/1751-8113/41/32/324013
null
cond-mat.dis-nn cond-mat.stat-mech
null
In this paper, we address the problem of how many randomly labeled patterns can be correctly classified by a single-layer perceptron when the patterns are correlated with each other. In order to solve this problem, two analytical schemes are developed based on the replica method and Thouless-Anderson-Palmer (TAP) approach by utilizing an integral formula concerning random rectangular matrices. The validity and relevance of the developed methodologies are shown for one known result and two example problems. A message-passing algorithm to perform the TAP scheme is also presented.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 06:55:50 GMT" } ]
2016-12-15T00:00:00
[ [ "Shinzato", "Takashi", "" ], [ "Kabashima", "Yoshiyuki", "" ] ]
[ 0.0218307395, -0.0897027254, 0.0393633246, 0.0123905838, 0.0737242773, 0.0643994659, 0.0392661914, 0.0075521246, -0.1110235155, 0.057065893, 0.0027121475, -0.0503636859, 0.0603198633, 0.0580372289, -0.0654193684, -0.0862544924, 0.107915245, 0.0525491871, 0.0212115142, -0.0268331114, -0.069353275, -0.0330739357, 0.0726072416, -0.041403126, 0.010247577, -0.0092458893, 0.0677020028, 0.1028643101, 0.0849431902, -0.0395575911, 0.0042161983, -0.0204587299, -0.153179422, -0.0336081684, -0.012469505, 0.0225470979, -0.0418402255, 0.0823691562, -0.1179199889, 0.0073396452, -0.0373235233, 0.040286094, -0.0147399986, 0.0340938345, 0.0238584001, -0.0293100141, -0.0754241124, 0.0075642662, 0.0013750452, 0.0842146873, -0.0978619382, 0.1555106342, -0.003463414, -0.0700817704, -0.097084865, 0.0117835002, -0.0529862903, 0.0158327501, 0.0280229952, -0.0200701952, 0.0011079282, -0.0873715281, 0.0091608968, -0.0423016101, -0.0982019007, 0.0132101467, -0.0705188736, -0.0116377994, -0.0395333096, 0.1072353125, -0.0099379644, 0.0167190917, 0.0259346273, 0.0226927996, -0.0333896168, 0.0624567978, -0.0143636065, 0.1695949733, 0.0142907565, 0.0691590086, 0.0816892162, 0.1206397265, 0.0069389697, -0.0159298833, -0.0459683985, -0.0716359094, -0.0858659595, -0.0758126453, -0.0919853598, -0.0697903708, -0.066099301, 0.0666821003, -0.0106482524, 0.085380286, 0.0596884973, -0.0179696847, 0.0177632775, -0.0553174913, 0.024696175, -0.0163305588, -0.0740642473, 0.0224378239, -0.1378323436, 0.0587171614, 0.0019563281, 0.0150556825, -0.0807664543, 0.0382948555, -0.0574058592, 0.0421559103, 0.0392176248, -0.0050175488, -0.0412574261, 0.0185282025, 0.131130144, -0.0992703736, 0.0365464538, 0.0390476398, 0.007467133, 0.0621168315, 0.0310584158, -0.0961135328, 0.03890194, 0.0019897176, -0.0122570256, -0.0542490222, -0.0143636065, -0.056094557, -0.0134529807, -0.0017499195, 0.0597370639, 0.0231420416, 0.0255460925, 0.0093126679, -0.1378323436, -0.0780952796, 0.0233970154, 0.0254732426, 0.0024799381, -0.0761040449, 0.080717884, 0.0130401636, -0.0517721213, 0.0629424676, -0.0436129123, 0.0230449066, -0.0341666862, 0.0266145617, -0.0252061263, 0.0210658144, -0.0935880616, -0.0629910305, -0.0737242773, 0.0193416961, -0.0539576225, -0.108789444, -0.0027197362, 0.0740642473, 0.0075824787, -0.0632824302, -0.0826605558, 0.0312283989, 0.0329039507, 0.0831462219, -0.0104114898, 0.069887504, -0.0126030631, -0.0098529728, -0.0746956095, -0.0873715281, -0.0723158419, -0.0491009504, -0.0530834235, -0.0653707981, 0.0856231228, 0.0561916903, -0.1145203188, -0.012918747, -0.1164629906, -0.1477399617, -0.027610179, 0.0665364042, -0.0369349904, 0.0471825674, -0.054394722, -0.007643187, 0.0415245444, 0.0703731701, 0.0638166666, 0.0249147266, 0.0242105089, 0.0374692231, 0.1416205466, 0.0466968976, 0.026638845, -0.1027671769, 0.0481538996, 0.0313498154, -0.0846032202, -0.0577458255, -0.073141478, -0.0295528471, 0.0459198318, 0.025910344, -0.0084870337, -0.0325154178, 0.0636224002, -0.0688190386, -0.062651068, -0.0423744619, 0.0689161718, -0.192421332, -0.0406989083, 0.0222192723, -0.0193295535, -0.0773182139, -0.0335353166, 0.027683029, -0.0984933004, 0.0743070766, -0.071927309, 0.0293585807, 0.0258617774, -0.0388290919, -0.0900426954, -0.0063743815, 0.1119948477, -0.1187941879, 0.0108060949, -0.1332670748, 0.0307427328, 0.0131251551, 0.0336081684, -0.0630881637, 0.0710045397, 0.0323211513, 0.0621168315, -0.1490998268, 0.0265417118, -0.0646423027, 0.0124270087, 0.1025729105, -0.0258132108, 0.082272023, -0.0331953503, 0.0666821003, -0.0709074065, 0.0150435409, 0.0075399829, -0.0223892573, 0.0761526152, 0.0593485273, 0.0160148758, 0.0047049006, 0.016706951, 0.0015457876 ]
712.4051
Amritanshu Prasad
Amritanshu Prasad
Representations of $GL_2(\Fq)$ and $SL_2(\Fq)$, and some remarks about $GL_n(\Fq)$
56 pages, Notes from a course taught at the Advanced Instructional School on Representation Theory and Related Topics held at the Bhaskaracharya Pratishthana and the University of Pune in July 2007
null
null
null
math.RT
null
The goal of these notes is to give a self-contained account of the representation theory of $GL_2$ and $SL_2$ over a finite field, and to give some indication of how the theory works for $GL_n$ over a finite field.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 07:20:34 GMT" } ]
2007-12-27T00:00:00
[ [ "Prasad", "Amritanshu", "" ] ]
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712.4052
German Sharov
G. S. Sharov
Closed String with Masses in Models of Baryons and Glueballs
19 pages, 3 figures
null
null
null
hep-ph
null
The closed string carrying $n$ point-like masses is considered as the model of a baryon ($n=3$), a glueball ($n=2$ or 3) or another exotic hadron. For this system the rotational states are obtained and classified. They correspond to exact solutions of dynamical equations, describing an uniform rotation of the string with massive points. These rotational states result in a set of quasilinear Regge trajectories with different behavior. The stability problem for the so called central rotational states (with a mass at the rotational center) is solved with using the analysis of small disturbances. These states turned out to be unstable, if the central mass is less than some critical value.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 07:38:22 GMT" } ]
2007-12-27T00:00:00
[ [ "Sharov", "G. S.", "" ] ]
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712.4053
Mayumi Aoki
Mayumi Aoki (Tokyo U., ICRR), Shinya Kanemura (Toyama U.)
Unitarity bounds in the Higgs model including triplet fields with custodial symmetry
1+15 pages, Version to be published in Phys. Rev. D
Phys.Rev.D77:095009,2008
10.1103/PhysRevD.77.095009
null
hep-ph
null
We study bounds on Higgs boson masses from perturbative unitarity in the Georgi-Machacek model, whose Higgs sector is composed of a scalar isospin doublet, a real and a complex isospin triplet fields. This model can be compatible with the electroweak precision data without fine tuning because of the imposed global SU(2)_R symmetry in the Higgs potential, by which the electroweak rho parameter is unity at the tree level. All possible two-body elastic-scattering channels are taken into account to evaluate the S-wave amplitude matrix, and then the condition of perturbative unitarity is imposed on the eigenvalues to obtain constraint on the Higgs parameters. Masses of all scalar bosons turn out to be bounded from above, some of which receive more strict upper bounds as compared to that in the standard model (712 GeV). In particular, the upper bound of the lightest scalar boson, whatever it would be, is about 270 GeV.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 08:51:00 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 06:09:42 GMT" } ]
2008-11-26T00:00:00
[ [ "Aoki", "Mayumi", "", "Tokyo U., ICRR" ], [ "Kanemura", "Shinya", "", "Toyama U." ] ]
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712.4054
Wei-Qin Zhao
W. Q. Zhao
Iterative Solution for Generalized Sombrero-shaped Potential in $N$-dimensional Space
10 pages, 3 figures
null
null
null
quant-ph
null
An explicit convergent iterative solution for the lowest energy state of the Schroedinger equation with generalized $N$-dimensional Sombrero-shaped potential is presented. The condition for the convergence of the iteration procedure and the dependence of the shape of the groundstate wave function on the parameters are discussed.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 08:18:49 GMT" } ]
2007-12-27T00:00:00
[ [ "Zhao", "W. Q.", "" ] ]
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712.4055
Kiyoshi Shiraishi
Nahomi Kan (Yamaguchi Junior College)
Induced Gravity in Deconstructed Space at Finite Temperature
use ptptex, 2 pages, 2 figures. A presentation given at ICGA8 (Nara, Japan), to appear in Prog. Theor. Phys. Supplement
null
null
null
gr-qc hep-th
null
We study self-consistent cosmological solutions for an Einstein universe in a graph-based induced gravity model. Especially, we demonstrate specific results for cycle graphs.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 08:05:35 GMT" } ]
2007-12-27T00:00:00
[ [ "Kan", "Nahomi", "", "Yamaguchi Junior College" ] ]
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712.4056
Yana Nec
Y. Nec, A.A. Nepomnyashchy and A.A. Golovin
Oscillatory instability in super-diffusive reaction -- diffusion systems: fractional amplitude and phase diffusion equations
null
null
10.1209/0295-5075/82/58003
null
nlin.PS
null
Nonlinear evolution of a reaction--super-diffusion system near a Hopf bifurcation is studied. Fractional analogues of complex Ginzburg-Landau equation and Kuramoto-Sivashinsky equation are derived, and some of their analytical and numerical solutions are studied.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 08:50:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Nec", "Y.", "" ], [ "Nepomnyashchy", "A. A.", "" ], [ "Golovin", "A. A.", "" ] ]
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712.4057
Aldar C.-F. Chan
Aldar C-F. Chan
On Compression of Cryptographic Keys
null
Theoretical Computer Science, 2013
10.1016/j.tcs.2013.04.010
null
cs.CR cs.NI
null
Any secured system can be modeled as a capability-based access control system in which each user is given a set of secret keys of the resources he is granted access to. In some large systems with resource-constrained devices, such as sensor networks and RFID systems, the design is sensitive to memory or key storage cost. With a goal to minimize the maximum users' key storage, key compression based on key linking, that is, deriving one key from another without compromising security, is studied. A lower bound on key storage needed for a general access structure with key derivation is derived. This bound demonstrates the theoretic limit of any systems which do not trade off security and can be treated as a negative result to provide ground for designs with security tradeoff. A concrete, provably secure key linking scheme based on pseudorandom functions is given. Using the key linking framework, a number of key pre-distribution schemes in the literature are analyzed.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 09:10:59 GMT" }, { "version": "v2", "created": "Wed, 23 Jan 2008 04:26:44 GMT" }, { "version": "v3", "created": "Tue, 19 Feb 2008 05:00:10 GMT" } ]
2021-09-21T00:00:00
[ [ "Chan", "Aldar C-F.", "" ] ]
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712.4058
Yana Nec
Y. Nec, A.A. Nepomnyashchy and A.A. Golovin
Weakly non-linear dynamics in reaction -- diffusion systems with L\'{e}vy flights
null
null
10.1088/0031-8949/2008/T132/014043
null
nlin.PS
null
Reaction--diffusion equations with a fractional Laplacian are reduced near a long wave Hopf bifurcation. The obtained amplitude equation is shown to be the complex Ginzburg-Landau equation with a fractional Laplacian. Some of the properties of the normal complex Ginzburg-Landau equation are generalised for the fractional analogue. In particular, an analogue of Kuramoto-Sivashinsky equation is derived.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 09:55:14 GMT" } ]
2009-11-13T00:00:00
[ [ "Nec", "Y.", "" ], [ "Nepomnyashchy", "A. A.", "" ], [ "Golovin", "A. A.", "" ] ]
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712.4059
Yashodhan Kanoria
Y. Kanoria, D. Manjunath
On Distributed Computation in Noisy Random Planar Networks
5 pages, 2 figures
Proceedings of IEEE International Symposium on Information Theory, 2007
10.1109/ISIT.2007.4557101
null
cs.IT math.IT
null
We consider distributed computation of functions of distributed data in random planar networks with noisy wireless links. We present a new algorithm for computation of the maximum value which is order optimal in the number of transmissions and computation time.We also adapt the histogram computation algorithm of Ying et al to make the histogram computation time optimal.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 10:20:56 GMT" } ]
2016-11-18T00:00:00
[ [ "Kanoria", "Y.", "" ], [ "Manjunath", "D.", "" ] ]
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712.406
Masatoshi Sato
Masatoshi Sato
A class function on the mapping class group of an orientable surface and the Meyer cocycle
15 pages, 4 figures
Algebr. Geom. Topol. 8 (2008) 1647-1665
10.2140/agt.2008.8.1647
null
math.GT
null
In this paper we define a $\mathbf{QP}^1$-valued class function on the mapping class group $\mathcal{M}_{g,2}$ of a surface $\Sigma_{g,2}$ of genus $g$ with two boundary components. Let $E$ be a $\Sigma_{g,2}$ bundle over a pair of pants $P$. Gluing to $E$ the product of an annulus and $P$ along the boundaries of each fiber, we obtain a closed surface bundle over $P$. We have another closed surface bundle by gluing to $E$ the product of $P$ and two disks. The sign of our class function cobounds the 2-cocycle on $\mathcal{M}_{g,2}$ defined by the difference of the signature of these two surface bundles over $P$.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 11:32:14 GMT" } ]
2016-01-20T00:00:00
[ [ "Sato", "Masatoshi", "" ] ]
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712.4061
Boris Kunyavskii
Boris Kunyavskii
Algebraic tori - thirty years after
18 pages
null
null
null
math.AG math.NT
null
This is an expanded version of my talk given at the International Conference ``Algebra and Number Theory'' dedicated to the 80th anniversary of V. E. Voskresenskii, which was held at the Samara State University in May 2007. The goal is to give an overview of results of V. E. Voskresenskii on arithmetic and birational properties of algebraic tori which culminated in his monograph "Algebraic Tori" published in Russian 30 years ago. I shall try to put these results and ideas into somehow broader context and also to give a brief digest of the relevant activity related to the period after the English version of the monograph "Algebraic Groups and Their Birational Invariants" appeared.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 10:25:28 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 08:32:20 GMT" } ]
2008-01-02T00:00:00
[ [ "Kunyavskii", "Boris", "" ] ]
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712.4062
Toshihiro Matsuo
Tsunehide Kuroki, Toshihiro Matsuo
Production cross section of rotating string
19 pages, no figure, v2: minor changes, some errors corrected in section 4, typos fixed
Nucl.Phys.B798:291-309,2008
10.1016/j.nuclphysb.2008.02.003
null
hep-th
null
We calculate production cross sections of a single rotating string from a collision of two light states in bosonic string theory. We find that the cross sections are written in terms of the modified Bessel function of the first kind with the degree given by the angular momentum in the high energy regime. We also obtain a similar formula from the partial wave expansion of four point amplitudes. Asymptotic behavior of the cross sections is consistent with a well known form factor of a string.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 10:28:19 GMT" }, { "version": "v2", "created": "Mon, 14 Jan 2008 13:28:44 GMT" } ]
2008-11-26T00:00:00
[ [ "Kuroki", "Tsunehide", "" ], [ "Matsuo", "Toshihiro", "" ] ]
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712.4063
Yoshiki Matsuda
Yoshiki Matsuda, Hidetoshi Nishimori, Koji Hukushima
Distribution of Lee-Yang zeros and Griffiths singularities in the $\pm J$ model of spin glasses
18 pages, 37 epsfiles
J. Phys. A: Math. Theor. 41 (2008) 324012
10.1088/1751-8113/41/32/324012
null
cond-mat.dis-nn cond-mat.stat-mech
null
We investigate the distribution of zeros of the partition function of the two- and three-dimensional symmetric $\pm J$ Ising spin glasses on the complex field plane. We use the method to analytically implement the idea of numerical transfer matrix which provides us with the exact expression of the partition function as a polynomial of fugacity. The results show that zeros are distributed in a wide region in the complex field plane. Nevertheless we observe that zeros on the imaginary axis play dominant roles in the critical behaviour since zeros on the imaginary axis are in closer proximity to the real axis. We estimate the density of zeros on the imaginary axis by an importance-sampling Monte Carlo algorithm, which enables us to sample very rare events. Our result suggests that the density has an essential singularity at the origin. This observation is consistent with the existence of Griffiths singularities in the present systems. This is the first evidence for Griffiths singularities in spin glass systems in equilibrium.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 15:45:13 GMT" }, { "version": "v2", "created": "Thu, 14 Feb 2008 11:52:01 GMT" } ]
2008-08-04T00:00:00
[ [ "Matsuda", "Yoshiki", "" ], [ "Nishimori", "Hidetoshi", "" ], [ "Hukushima", "Koji", "" ] ]
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712.4064
Piotr T. Chru\'sciel
Piotr T. Chru\'sciel, Yanyan Li and Gilbert Weinstein
Mass and angular-momentum inequalities for axi-symmetric initial data sets. II. Angular-momentum
added Appendix C on uniqueness
AnnalsPhys.323:2591-2613,2008
10.1016/j.aop.2007.12.011
null
gr-qc
null
We extend the validity of Dain's angular-momentum inequality to maximal, asymptotically flat, initial data sets on a simply connected manifold with several asymptotically flat ends which are invariant under a U(1) action and which admit a twist potential.
[ { "version": "v1", "created": "Wed, 26 Dec 2007 16:29:32 GMT" }, { "version": "v2", "created": "Fri, 30 May 2008 19:53:50 GMT" } ]
2008-11-26T00:00:00
[ [ "Chruściel", "Piotr T.", "" ], [ "Li", "Yanyan", "" ], [ "Weinstein", "Gilbert", "" ] ]
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712.4065
Israfil Guseinov
I.I.Guseinov
Nonrelativistic, Quasirelativistic and Relativistic Sets of Wave Functions, and Slater Orbitals of Particles with Arbitrary Spin
9 pages, 3 tables
null
null
null
physics.chem-ph
null
Using the complete orthonormal basis sets of nonrelativistic and quasirelativistic orbitals introduced by the author in previous papers for particles with arbitrary spin the new analytical relations for the -component relativistic tensor wave functions and tensor Slater orbitals in coordinate, momentum and four-dimensional spaces are derived, where. The relativistic tensor function sets are expressed through the corresponding nonrelativistic and quasirelativistic orbitals. The analytical formulas for overlap integrals over relativistic tensor Slater orbitals with the same screening constants in coordinate space are also derived.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 11:27:22 GMT" } ]
2007-12-27T00:00:00
[ [ "Guseinov", "I. I.", "" ] ]
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712.4066
Balakin Alexander
Alexander B. Balakin, Vladimir V. Bochkarev and Jos\'e P. S. Lemos
Non-minimal coupling for the gravitational and electromagnetic fields: black hole solutions and solitons
25pages, 6 figures, 1 table, replaced with the version published in Physical Review
Phys.Rev.D77:084013,2008
10.1103/PhysRevD.77.084013
null
gr-qc astro-ph hep-th
null
Using a Lagrangian formalism, a three-parameter non-minimal Einstein-Maxwell theory is established. The three parameters, $q_1$, $q_2$ and $q_3$, characterize the cross-terms in the Lagrangian, between the Maxwell field and terms linear in the Ricci scalar, Ricci tensor, and Riemann tensor, respectively. Static spherically symmetric equations are set up, and the three parameters are interrelated and chosen so that effectively the system reduces to a one parameter only, $q$. Specific black hole and other type of one-parameter solutions are studied. First, as a preparation, the Reissner-Nordstr\"om solution, with $q_1=q_2=q_3=0$, is displayed. Then, we seek for solutions in which the electric field is regular everywhere as well as asymptotically Coulombian, and the metric potentials are regular at the center as well as asymptotically flat. In this context, the one-parameter model with $q_1\equiv -q$, $q_2=2q$, $q_3=-q$, called the Gauss-Bonnet model, is analyzed in detail. The study is done through the solution of the Abel equation (the key equation), and the dynamical system associated with the model. There is extra focus on an exact solution of the model and its critical properties. Finally, an exactly integrable one-parameter model, with $q_1\equiv -q$, $q_2=q$, $q_3=0$, is considered also in detail. A special sub-model, in which the Fibonacci number appears naturally, of this one-parameter model is shown, and the corresponding exact solution is presented. Interestingly enough, it is a soliton of the theory, the Fibonacci soliton, without horizons and with a mild conical singularity at the center.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 12:07:08 GMT" }, { "version": "v2", "created": "Fri, 18 Apr 2008 14:42:00 GMT" } ]
2008-11-26T00:00:00
[ [ "Balakin", "Alexander B.", "" ], [ "Bochkarev", "Vladimir V.", "" ], [ "Lemos", "José P. S.", "" ] ]
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712.4067
Vasily Klimov
V.V. Klimov, A. Lambrecht
Plasmonic nature of van der Waals forces between nanoparticles
4 pages 5 figures
Plasmonics 4, 31-36 (2009)
10.1007/s11468-008-9074-y
null
cond-mat.other
null
We propose a new approach to calculate van der Waals forces between nanoparticles where the van der Waals energy can be reduced to the energy of elementary surface plasmon oscillations in nanoparticles. The general theory is applied to describe the interaction between 2 metallic nanoparticles and between a nanoparticle and a perfectly conducting plane. Our results could be used to prove experimentally the existence of plasmonic molecules and to elaborate new control mechanisms for the adherence of nanoparticles between each other or onto surfaces.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 13:17:32 GMT" } ]
2015-01-27T00:00:00
[ [ "Klimov", "V. V.", "" ], [ "Lambrecht", "A.", "" ] ]
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712.4068
Keisuke Okamura
Nick Dorey and Keisuke Okamura
Singularities of the Magnon Boundstate S-Matrix
32 pages, 9 figures
JHEP 0803:037,2008
10.1088/1126-6708/2008/03/037
DAMTP-2007-126, UT-07-20
hep-th
null
We study the conjectured exact S-matrix for the scattering of BPS magnon boundstates in the spin-chain description of planar N=4 SUSY Yang-Mills. The conjectured S-matrix exhibits both simple and double poles at complex momenta. Some of these poles lie parametrically close to the real axis in momentum space on the branch where particle energies are positive. We show that all such poles are precisely accounted for by physical processes involving one or more on-shell intermediate particles belonging to the known BPS spectrum.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 13:14:50 GMT" } ]
2009-12-15T00:00:00
[ [ "Dorey", "Nick", "" ], [ "Okamura", "Keisuke", "" ] ]
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712.4069
Boris Kunyavskii
Boris Kunyavskii
The Bogomolov multiplier of finite simple groups
10 pages (final version)
Cohomological and geometric approaches to rationality problems, 209-217, Progr. Math., 282, Birkhauser Boston, Boston, MA, 2010
10.1007/978-0-8176-4934-0
null
math.GR math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The subgroup of the Schur multiplier of a finite group G consisting of all cohomology classes whose restriction to any abelian subgroup of G is zero is called the Bogomolov multiplier of G. We prove that if G is quasisimple or almost simple, its Bogomolov multiplier is trivial except for the case of certain covers of PSL(3,4).
[ { "version": "v1", "created": "Tue, 25 Dec 2007 13:21:01 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 08:35:18 GMT" }, { "version": "v3", "created": "Tue, 2 Aug 2022 08:29:32 GMT" } ]
2022-08-03T00:00:00
[ [ "Kunyavskii", "Boris", "" ] ]
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712.407
Mohsen Alishahiha
Mohsen Alishahiha, Farhad Ardalan, Hajar Ebrahim and Subir Mukhopadhyay
On 5D Small Black Holes
18 pages, Latex; V2: few comments added; V3: typos corrected
JHEP 0803:074,2008
10.1088/1126-6708/2008/03/074
null
hep-th
null
Using higher order corrections we argue that five dimensional N=2 and N=4 small black holes exhibit supersymmetry enhancement in near horizon geometry leading to eight and sixteen supercharges, respectively. Using this enhancement at supergravity level we can identify the global supergroup of the near horizon geometry. In particular we show how this supergroup distinguishes between small and large black holes in N=2 case.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 13:22:53 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 15:53:13 GMT" }, { "version": "v3", "created": "Mon, 26 May 2008 07:46:48 GMT" } ]
2014-11-18T00:00:00
[ [ "Alishahiha", "Mohsen", "" ], [ "Ardalan", "Farhad", "" ], [ "Ebrahim", "Hajar", "" ], [ "Mukhopadhyay", "Subir", "" ] ]
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712.4071
Tahl Nowik
Tahl Nowik
Order one invariants of planar curves
null
null
null
null
math.GT
null
We give a complete description of all order 1 invariants of planar curves.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 15:05:53 GMT" } ]
2007-12-27T00:00:00
[ [ "Nowik", "Tahl", "" ] ]
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712.4072
Sandhya Choubey
Sanjib Kumar Agarwalla, Sandhya Choubey, Amitava Raychaudhuri
Physics with Beta-Beam
Talk at the 9th International Workshop on Neutrino Factories, SuperBeams and BetaBeams (NuFact07), Okayama University, Okayama, Japan, August 6-11, 2007
AIPConf.Proc.981:84-88,2008
10.1063/1.2899008
null
hep-ph hep-ex
null
A Beta-beam would be a high intensity source of pure $\nu_e$ and/or $\bar\nu_e$ flux with known spectrum, ideal for precision measurements. Myriad of possible set-ups with suitable choices of baselines, detectors and the beta-beam neutrino source with desired energies have been put forth in the literature. In this talk we present a comparitive discussion of the physics reach of a few such experimental set-ups.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 14:30:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Agarwalla", "Sanjib Kumar", "" ], [ "Choubey", "Sandhya", "" ], [ "Raychaudhuri", "Amitava", "" ] ]
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712.4073
Roman Schmied
Roman Schmied, Tommaso Roscilde, Valentin Murg, Diego Porras, J. Ignacio Cirac
Quantum Phases of Trapped Ions in an Optical Lattice
re-formatted; added discussion of feasibility
New Journal of Physics 10 (2008) 045017 (18pp)
10.1088/1367-2630/10/4/045017
null
cond-mat.str-el
null
We propose loading trapped ions into microtraps formed by an optical lattice. For harmonic microtraps, the Coulomb coupling of the spatial motions of neighboring ions can be used to construct a broad class of effective short-range Hamiltonians acting on an internal degree of freedom of the ions. For large anharmonicities, on the other hand, the spatial motion of the ions itself represents a spin-1/2 model with frustrated dipolar XY interactions. We illustrate the latter setup with three systems: the linear chain, the zig-zag ladder, and the triangular lattice. In the frustrated zig-zag ladder with dipolar interactions we find chiral ordering beyond what was predicted previously for a next-nearest-neighbor model. In the frustrated anisotropic triangular lattice with nearest-neighbor interactions we find that the transition from the one-dimensional gapless spin-liquid phase to the two-dimensional spiraling ordered phase passes through a gapped spin-liquid phase, similar to what has been predicted for the same model with Heisenberg interactions. Further, a second gapped spin-liquid phase marks the transition to the two-dimensional Neel-ordered phase.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 14:32:11 GMT" }, { "version": "v2", "created": "Wed, 13 Feb 2008 15:16:07 GMT" } ]
2008-06-01T00:00:00
[ [ "Schmied", "Roman", "" ], [ "Roscilde", "Tommaso", "" ], [ "Murg", "Valentin", "" ], [ "Porras", "Diego", "" ], [ "Cirac", "J. Ignacio", "" ] ]
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712.4074
Georgi Medvedev
Pawel Hitczenko and Georgi S. Medvedev
Bursting oscillations induced by small noise
null
null
null
null
nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a model of a square-wave bursting neuron residing in the regime of tonic spiking. Upon introduction of small stochastic forcing, the model generates irregular bursting. The statistical properties of the emergent bursting patterns are studied in the present work. In particular, we identify two principal statistical regimes associated with the noise-induced bursting. In the first case, (type I) bursting oscillations are created mainly due to the fluctuations in the fast subsystem. In the alternative scenario, type II bursting, the random perturbations in the slow dynamics play a dominant role. We propose two classes of randomly perturbed slow-fast systems that realize type I and type II scenarios. For these models, we derive the Poincare maps. The analysis of the linearized Poincare maps of the randomly perturbed systems explains the distributions of the number of spikes within one burst and reveals their dependence on the small and control parameters present in the models. The mathematical analysis of the model problems is complemented by the numerical experiments with a generic Hodgkin-Huxley type model of a bursting neuron.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 15:37:55 GMT" }, { "version": "v2", "created": "Mon, 10 Nov 2008 22:43:17 GMT" } ]
2008-11-11T00:00:00
[ [ "Hitczenko", "Pawel", "" ], [ "Medvedev", "Georgi S.", "" ] ]
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712.4075
Vitaly Skachek
Vitaly Skachek, Mark F. Flanagan, Eimear Byrne, Marcus Greferath
Polytope Representations for Linear-Programming Decoding of Non-Binary Linear Codes
5 pages, to appear in 2008 IEEE International Symposium on Information Theory
null
10.1109/ISIT.2008.4595239
null
cs.IT math.IT
null
In previous work, we demonstrated how decoding of a non-binary linear code could be formulated as a linear-programming problem. In this paper, we study different polytopes for use with linear-programming decoding, and show that for many classes of codes these polytopes yield a complexity advantage for decoding. These representations lead to polynomial-time decoders for a wide variety of classical non-binary linear codes.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 15:44:01 GMT" }, { "version": "v2", "created": "Thu, 17 Apr 2008 17:35:15 GMT" } ]
2016-11-18T00:00:00
[ [ "Skachek", "Vitaly", "" ], [ "Flanagan", "Mark F.", "" ], [ "Byrne", "Eimear", "" ], [ "Greferath", "Marcus", "" ] ]
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712.4076
Planchon
Fabrice Planchon and Luis Vega
Bilinear virial identities and applications
30 pages, final version to appear in the Annales Scientifiques de l'ENS
null
null
null
math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove bilinear virial identities for the nonlinear Schrodinger equation, which are extensions of the Morawetz interaction inequalities. We recover and extend known bilinear improvements to Strichartz inequalities and provide applications to various nonlinear problems, most notably on domains with boundaries.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 16:43:53 GMT" }, { "version": "v2", "created": "Fri, 1 Aug 2008 20:38:24 GMT" } ]
2008-08-01T00:00:00
[ [ "Planchon", "Fabrice", "" ], [ "Vega", "Luis", "" ] ]
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712.4077
Antonio Romaguera
Mauro M. Doria, Antonio R. de C. Romaguera, M. V. Milo\v{s}evi\'c, F. M. Peeters
Threefold onset of vortex loops in superconductors with a magnetic core
6 pages, 6 figures (low resolution), latex2e
2007 EPL 79 47006 (6pp)
10.1209/0295-5075/79/47006
null
cond-mat.supr-con
null
A magnetic inclusion inside a superconductor gives rise to a fascinating complex of {\it vortex loops}. Our calculations, done in the framework of the Ginzburg-Landau theory, reveal that {\it loops always nucleate in triplets} around the magnetic core. In a mesoscopic superconducting sphere, the final superconducting state is characterized by those confined vortex loops and the ones that eventually spring to the surface of the sphere, evolving into {\it vortex pairs} piercing through the sample surface.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 17:07:09 GMT" } ]
2007-12-27T00:00:00
[ [ "Doria", "Mauro M.", "" ], [ "Romaguera", "Antonio R. de C.", "" ], [ "Milošević", "M. V.", "" ], [ "Peeters", "F. M.", "" ] ]
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712.4078
Antonio Romaguera
Antonio R. de C. Romaguera, Mauro M. Doria, F. M. Peeters
Transverse magnetization and torque in asymmetrical mesoscopic superconductors
4 pages, 4 figures (low resolution)
Phys. Rev. B 76, 020505(R) (2007) (4 pages)
10.1103/PhysRevB.76.020505
null
cond-mat.supr-con cond-mat.mes-hall cond-mat.mtrl-sci
null
We show that asymmetrical mesoscopic superconductors bring new insight into vortex physics where we found the remarkable coexistence of long and short vortices. We study an asymmetrical mesoscopic sphere, that lacks one of its quadrants, and obtain its three-dimensional vortex patterns by solving the Ginzburg-Landau theory. We find that the vortex patterns are asymmetric whose effects are clearly visible and detectable in the transverse magnetization and torque.
[ { "version": "v1", "created": "Tue, 25 Dec 2007 18:05:30 GMT" } ]
2007-12-27T00:00:00
[ [ "Romaguera", "Antonio R. de C.", "" ], [ "Doria", "Mauro M.", "" ], [ "Peeters", "F. M.", "" ] ]
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