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712.1279
Salvatore Caporaso
Salvatore Caporaso and Nicola Corriero
Kleene, Rogers and Rice Theorems Revisited in C and in Bash
10 pages
null
null
null
cs.LO
null
The recursion theorem in the weak form {e}(z)=x(e,z) (universal function not needed) and in Rogers form {n}(z)={{x}(n)}(z) and Rice theorem are proved a first time using programs in C, and a second time with scripts in Bash.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 12:05:40 GMT" } ]
2007-12-11T00:00:00
[ [ "Caporaso", "Salvatore", "" ], [ "Corriero", "Nicola", "" ] ]
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712.128
Sacha E. Kopp
Sacha E. Kopp (for the MINOS Collaboration)
Neutrino Spectra and Uncertainties for MINOS
contribution to the proceedings of NuFact07 (Okayama, Japan)
AIPConf.Proc.981:142-144,2008
10.1063/1.2898912
null
hep-ex
null
The MINOS experiment at Fermilab has released an updated result on muon disappearance based upon 2.5 x 10^20 protons on target. The experiment utilizes the intense source of muon neutrinos provided by the NuMI beam line. This note summarizes the systematic uncertainties in the experiment's knowledge of the flux and energy spectrum of the neutrinos from NuMI.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 12:11:48 GMT" } ]
2019-08-13T00:00:00
[ [ "Kopp", "Sacha E.", "", "for the MINOS Collaboration" ] ]
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712.1281
David Singh
D. J. Singh, Chul-Hong Park
Polar Behavior in a Magnetic Perovskite Via A-Site Disorder
4 pages
null
null
null
cond-mat.mtrl-sci cond-mat.str-el
null
We elucidate a mechanism for obtaining polar behavior in magnetic perovskites based on A-site disorder and demonstrate this mechanism by density functional calculations for the double perovskite (La,Lu)MnNiO$_6$ with Lu concentrations at and below 50%. We show that this material combines polar behavior and ferromagnetism. The mechanism is quite general and may be applicable to a wide range of magnetic perovskites.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 12:12:22 GMT" } ]
2007-12-11T00:00:00
[ [ "Singh", "D. J.", "" ], [ "Park", "Chul-Hong", "" ] ]
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712.1282
Liang Gang Liu
Bao-quan Ai, Hui-zhang Xie and Liang-gang Liu
Thermal noise can facilitate energy transformation in the presence of entropic barriers
14 pages, 7 figures
Phys. Rev. E 75(2007)061126
10.1103/PhysRevE.75.061126
null
cond-mat.stat-mech cond-mat.soft
null
Efficiency of a Brownian particle moving along the axis of a three-dimensional asymmetric periodic channel is investigated in the presence of a symmetric unbiased force and a load. Reduction of the spatial dimensionality from two or three physical dimensions to an effective one-dimensional system entails the appearance of entropic barriers and an effective diffusion coefficient. The energetics in the presence of entropic barriers exhibits peculiar behavior which is different from that occurring through energy barriers. We found that even on the quasistatic limit there is a regime where the efficiency can be a peaked function of temperature, which indicates that thermal noise can facilitate energy transformation, contrary to the case of energy barriers. The appearance of entropic barriers may induce optimized efficiency at a finite temperature.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 12:29:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Ai", "Bao-quan", "" ], [ "Xie", "Hui-zhang", "" ], [ "Liu", "Liang-gang", "" ] ]
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712.1283
Tsuyoshi Sawada
Tsuyoshi Sawada, Norio Ikeda, Kazuyoshi Sunada, Nario Kuno, Takeshi Kamazaki, Koh-Ichiro Morita, Yasutaka Kurono, Norikazu Koura, Katsumi Abe, Sachiko Kawase, Jun Maekawa, Osamu Horigome, Kiyohiko Yanagisawa
On-The-Fly Observing System of the Nobeyama 45-m and ASTE 10-m Telescopes
11 pages, 13 figures, accepted for publication in PASJ
null
10.1093/pasj/60.3.445
null
astro-ph
null
We have developed spectral line On-The-Fly (OTF) observing mode for the Nobeyama Radio Observatory 45-m and the Atacama Submillimeter Telescope Experiment 10-m telescopes. Sets of digital autocorrelation spectrometers are available for OTF with heterodyne receivers mounted on the telescopes, including the focal-plane 5 x 5 array receiver, BEARS, on the 45-m. During OTF observations, the antenna is continuously driven to cover the mapped region rapidly, resulting in high observing efficiency and accuracy. Pointing of the antenna and readouts from the spectrometer are recorded as fast as 0.1 second. In this paper we report improvements made on software and instruments, requirements and optimization of observing parameters, data reduction process, and verification of the system. It is confirmed that, using optimal parameters, the OTF is about twice as efficient as conventional position-switch observing method.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 14:15:39 GMT" } ]
2015-05-13T00:00:00
[ [ "Sawada", "Tsuyoshi", "" ], [ "Ikeda", "Norio", "" ], [ "Sunada", "Kazuyoshi", "" ], [ "Kuno", "Nario", "" ], [ "Kamazaki", "Takeshi", "" ], [ "Morita", "Koh-Ichiro", "" ], [ "Kurono", "Yasutaka", "" ], [ "Koura", "Norikazu", "" ], [ "Abe", "Katsumi", "" ], [ "Kawase", "Sachiko", "" ], [ "Maekawa", "Jun", "" ], [ "Horigome", "Osamu", "" ], [ "Yanagisawa", "Kiyohiko", "" ] ]
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712.1284
Gennady Chuev N.
Gennady N. Chuev and Pascal Quemerais
Nature of metal-nonmetal transition in metal-ammonia solutions. II. From uniform metallic state to inhomogeneous electronic microstructure
22 pages, 10 figures
null
10.1063/1.2883695
null
cond-mat.stat-mech cond-mat.str-el
null
Applying semi-analytical models of nonideal plasma, we evaluate the behavior of the metallic phase in metal-ammonia solutions (MAS). This behavior is mainly controlled by the degenerate electron gas, which remains stable down to 5 MPM due to high solvent polarizability and strong dielectric screening of solvated ions. Comparing the behavior of the metallic state with those of localized solvated electrons, we have estimated the miscibility gap $\Delta n$ for various alkali metals and found $\Delta n$(Na)$> \Delta n($K$)$. It is rather narrow in Rb-NH$_3$ and does not occur in Cs-NH$_3$ solutions, which is in full agreement with the experiments. The case of Li is discussed separately. The difference calculated in the excess free energies of the metallic and nonmetallic phases is in the order of $k_BT$, yielding a thermally fluctuating mixed state at intermediate metal concentrations. It results in a continuous metal-nonmetal (MNM) transition above the consolute point $T_c$ and a phase separation below $T_c$. We propose a criterion for the MNM transition which may be attributed to the line of the maximum of compressibility above $T_c$. This line crosses the spinodal one at the critical temperature. Finally, we assert that a new electronic phase similar to microemulsion should also arise between the spinodal and the binodal lines.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 14:09:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Chuev", "Gennady N.", "" ], [ "Quemerais", "Pascal", "" ] ]
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712.1285
Paride Paradisi
J. Hisano, M. Nagai and P. Paradisi
"Flavored" Electric Dipole Moments in Supersymmetric Theories
4 pages, 1 figure
Phys.Rev.D78:075019,2008
10.1103/PhysRevD.78.075019
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Standard Model (SM) predictions for the hadronic electric dipole moments (EDMs) are well far from the present experimental resolutions, thus, the EDMs represent very clean probes of New Physics (NP) effects. Especially, within an MSSM framework with flavor-changing (but not necessarily CP violating) soft terms, large and potentially visible effects to the EDMs are typically expected. In this Letter we point out that, beyond-leading-order (BLO) effects, so far neglected in the literature, dominate over the leading-order (LO) effects in large regions of the parameter space, hence, their inclusion in the evaluation of the hadronic EDMs is unavoidable.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 13:58:55 GMT" }, { "version": "v2", "created": "Tue, 30 Sep 2008 17:49:05 GMT" } ]
2008-11-26T00:00:00
[ [ "Hisano", "J.", "" ], [ "Nagai", "M.", "" ], [ "Paradisi", "P.", "" ] ]
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712.1286
Bernhard Heim
Bernhard Heim
Miyawaki's $F_{12}$ Spinor L-function Conjecture
13 pages
Kyoto J. Math. 52, no. 4 (2012), 817-828
10.1215/21562261-1728875
null
math.NT math.RT
null
In this paper we prove the Miyawaki conjecture related to the spinor $L$--function of a Siegel cusp form of weight 12 and degree 3 as a special example of results related to Miyawaki lifts of odd degree.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 14:16:03 GMT" } ]
2015-01-14T00:00:00
[ [ "Heim", "Bernhard", "" ] ]
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712.1287
Fatemeh Ebrahimi
Fatemeh Ebrahimi
The shape of invasion perclation clusters in random and correlated media
null
null
10.1088/1742-5468/2008/04/P04005
null
cond-mat.stat-mech
null
The shape of two-dimensional invasion percolation clusters are studied numerically for both non-trapping (NTIP) and trapping (TIP) invasion percolation processes. Two different anisotropy quantifiers, the anisotropy parameter and the asphericity are used for probing the degree of anisotropy of clusters. We observe that in spite of the difference in scaling properties of NTIP and TIP, there is no difference in the values of anisotropy quantifiers of these processes. Furthermore, we find that in completely random media, the invasion percolation clusters are on average slightly less isotropic than standard percolation clusters. Introducing isotropic long-range correlations into the media reduces the isotropy of the invasion percolation clusters. The effect is more pronounced for the case of persisting long-range correlations. The implication of boundary conditions on the shape of clusters is another subject of interest. Compared to the case of free boundary conditions, IP clusters of conventional rectangular geometry turn out to be more isotropic. Moreover, we see that in conventional rectangular geometry the NTIP clusters are more isotropic than TIP clusters.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 14:21:04 GMT" }, { "version": "v2", "created": "Mon, 3 Mar 2008 12:07:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Ebrahimi", "Fatemeh", "" ] ]
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712.1288
Takayuki Matsuki
Takayuki Matsuki, Toshiyuki Morii, and Kazutaka Sudoh
Study of Structure of the Mass Gap between Two Spin Multiplets
8 pages, 2 figures, Invited talk given at the XII International Conference on Hadron Spectroscopy (Hadron 07), Frascati, October 8-13, 2007
null
null
null
hep-ph hep-ex
null
Studying our semirelativistic potential model and the numerical results, which succeeds in predicting and reproducing recently discovered higher resonances of $D$, $D_s$, $B$, and $B_s$, we find a simple expression for the mass gap between two spin multiplets of heavy-light mesons, $(0^-,1^-)$ and $(0^+,1^+)$. The mass gap between chiral partners defined by $\Delta M=M(0^+)-M(0^-)$ and/or $M(1^+)-M(1^-)$ is given by $\Delta M=M(0^+)-M(0^-)=M(1^+)-M(1^-)\approx \Lambda_{\rm Q}-m_q$ in the limit of heavy quark symmetry. We also study the case including $1/m_Q$ corrections.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 15:45:51 GMT" } ]
2008-03-29T00:00:00
[ [ "Matsuki", "Takayuki", "" ], [ "Morii", "Toshiyuki", "" ], [ "Sudoh", "Kazutaka", "" ] ]
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712.1289
Dimitri Vvedensky
A. Zangwill and D. D. Vvedensky
Regimes of Precursor-Mediated Epitaxial Growth
10 pages, 2 figures
null
null
null
cond-mat.mtrl-sci
null
A discussion of epitaxial growth is presented for those situations (OMVPE, CBE, ALE, MOMBE, GSMBE, etc.) when the kinetics of surface processes associated with molecular precursors may be rate limiting. Emphasis is placed on the identification of various {\it characteristic length scales} associated with the surface processes. Study of the relative magnitudes of these lengths permits one to identify regimes of qualitatively different growth kinetics as a function of temperature and deposition flux. The approach is illustrated with a simple model which takes account of deposition, diffusion, desorption, dissociation, and step incorporation of a single precursor species, as well as the usual processes of atomic diffusion and step incorporation. Experimental implications are discussed in some detail.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 15:51:31 GMT" } ]
2007-12-11T00:00:00
[ [ "Zangwill", "A.", "" ], [ "Vvedensky", "D. D.", "" ] ]
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712.129
Nils Bluemer
N. Bl\"umer
Numerically exact Green functions from Hirsch-Fye quantum Monte Carlo simulations
4 pages, 6 figures
null
null
null
cond-mat.str-el
null
We present a new method for extracting numerically exact imaginary-time Green functions from standard Hirsch-Fye quantum Monte Carlo (HF-QMC) simulations within dynamical mean-field theory. By analytic continuation, angular resolved spectra are obtained without the discretization bias previously associated with HF-QMC results. The method is shown to be accurate even at very low temperatures (T=W/800 for bandwidth W) in the strongly correlated regime.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 16:07:11 GMT" } ]
2007-12-11T00:00:00
[ [ "Blümer", "N.", "" ] ]
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712.1291
Kaiki Taro Inoue
Kenji Tomita and Kaiki Taro Inoue
Second Order Gravitational Effects on CMB Temperature Anisotropy in Lambda dominated flat universes
16 pages, 8 figures, No major change. Eqs (5.6) and (5.7) are modified to include uncompensating cases
Phys.Rev.D77:103522,2008
10.1103/PhysRevD.77.103522
KU-TP-18
astro-ph gr-qc
null
We study second order gravitational effects of local inhomogeneities on the cosmic microwave background radiation in flat universes with matter and a cosmological constant $\Lambda$. We find that the general relativistic correction to the Newtonian approximation is negligible at second order provided that the size of the inhomogeneous region is sufficiently smaller than the horizon scale. For a spherically symmetric top-hat type quasi-linear perturbation, the first order temperature fluctuation corresponding to the linear integrated Sachs-Wolfe (ISW) effect is enhanced(suppressed) by the second order one for a compensated void(lump). As a function of redshift of the local inhomogeneity, the second order temperature fluctuations due to evolution of the gravitational potential have a peak before the matter-$\Lambda$ equality epoch for a fixed comoving size and a density contrast. The second order gravitational effects from local quasi-linear inhomogeneities at a redshift z~1 may significantly affect the cosmic microwave background.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 16:53:40 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 07:27:31 GMT" } ]
2014-09-08T00:00:00
[ [ "Tomita", "Kenji", "" ], [ "Inoue", "Kaiki Taro", "" ] ]
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712.1292
Manuela Rodriguez-Gallardo
M. Rodriguez-Gallardo, A. Deltuva, E. Cravo, R. Crespo, and A. C. Fonseca
Two-body scattering without angular-momentum decomposition
null
Phys.Rev.C78:034602,2008
10.1103/PhysRevC.78.034602
null
nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two-body scattering is studied by solving the Lippmann-Schwinger equation in momentum space without angular-momentum decomposition for a local spin dependent short range interaction plus Coulomb. The screening and renormalization approach is employed to treat the Coulomb interaction. Benchmark calculations are performed by comparing our procedure with partial-wave calculations in configuration space for p-10Be, p-16O and 12C-10Be elastic scattering, using a simple optical potential model.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 15:48:25 GMT" }, { "version": "v2", "created": "Wed, 2 Jul 2008 14:03:16 GMT" }, { "version": "v3", "created": "Fri, 5 Sep 2008 15:10:02 GMT" } ]
2008-11-26T00:00:00
[ [ "Rodriguez-Gallardo", "M.", "" ], [ "Deltuva", "A.", "" ], [ "Cravo", "E.", "" ], [ "Crespo", "R.", "" ], [ "Fonseca", "A. C.", "" ] ]
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712.1293
Tomasz Dietl
Tomasz Dietl
Interplay between carrier localization and magnetism in diluted magnetic and ferromagnetic semiconductors
8 figures, special issue of Journal of the Physical Society of Japan on "Advances in Spintronics"; in v2, typo in Eq. 1 corrected
J. Phys. Soc. Jpn. 77 (2008) 031005
10.1143/JPSJ.77.031005
null
cond-mat.dis-nn cond-mat.mtrl-sci
null
The presence of localized spins exerts a strong influence on quantum localization in doped semiconductors. At the same time carrier-mediated interactions between the localized spins are modified or even halted by carriers' localization. The interplay of these effects is discussed for II-VI and III-V diluted magnetic semiconductors. This insight is exploited to interpret the complex dependence of resistance on temperature, magnetic field, and concentration of valence-band holes in (Ga,Mn)As. In particular, high field negative magnetoresistance results from the orbital weak localization effect. The resistance maximum and the associated negative magnetoresistance near the Curie temperature are assigned to the destructive influence of preformed ferromagnetic bubbles on the "antilocalization" effect driven by disorder-modified carrier-carrier interactions. These interactions account also for the low-temperature increase of resistance. Furthermore, the sensitivity of conductance to spin splitting and to scattering by spin disorder may explain resistance anomalies at coercive fields, where relative directions of external and molecular fields change.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 08:56:15 GMT" }, { "version": "v2", "created": "Fri, 28 Dec 2007 13:20:12 GMT" } ]
2008-10-20T00:00:00
[ [ "Dietl", "Tomasz", "" ] ]
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712.1294
Antonio Pineda
David Nevado and Antonio Pineda
Forward virtual Compton scattering and the Lamb shift in chiral perturbation theory
13 pages, 1 figure. Minor changes, misprints corrected, two referenced added
Phys.Rev.C77:035202,2008
10.1103/PhysRevC.77.035202
null
hep-ph nucl-th physics.atom-ph
null
We compute the spin-independent structure functions of the forward virtual-photon Compton tensor of the proton at one loop using heavy baryon chiral perturbation theory and dispersion relations. We study the relation between both approaches. We use these results to generalize some sum rules to virtual photon transfer momentum and relate them with sum rules in deep inelastic scattering. We then compute the leading chiral term of the polarizability correction to the Lamb shift of the hydrogen and muonic hydrogen. We obtain -87.05/n^3 Hz and -0.148/n^3 meV for the correction to the hydrogen and muonic hydrogen Lamb shift respectively.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 17:38:24 GMT" }, { "version": "v2", "created": "Sat, 8 Mar 2008 14:38:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Nevado", "David", "" ], [ "Pineda", "Antonio", "" ] ]
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712.1295
Ciprian Demeter
Ciprian Demeter, Michael Lacey, Terence Tao, Christoph Thiele
The Walsh model for $M_2^{*}$ Carleson
20 pages, 0 figures
null
null
null
math.CA
null
We study the Walsh model of a certain maximal truncation of Carleson's operator, related to the Return Times Theorem from Ergodic Theory.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 18:01:20 GMT" } ]
2007-12-11T00:00:00
[ [ "Demeter", "Ciprian", "" ], [ "Lacey", "Michael", "" ], [ "Tao", "Terence", "" ], [ "Thiele", "Christoph", "" ] ]
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712.1296
Venkateswaran Krishnan
Venkateswaran P. Krishnan
A generalization of inversion formulas of Pestov and Uhlmann
6 pages
null
null
null
math.DG math.CA
null
In this note, we give a generalization of the inversion formulas of Pestov-Uhlmann for the geodesic ray transform of functions and vector fields on simple 2-dimensional manifolds of constant curvature. The inversion formulas given here hold for 2-dimensional simple manifolds whose curvatures close to a constant.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 18:02:48 GMT" } ]
2007-12-11T00:00:00
[ [ "Krishnan", "Venkateswaran P.", "" ] ]
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712.1297
Olga Melnyk
O. V. Melnyk, A. A. Elyiv, I. B. Vavilova
The Structure of the Local Supercluster of Galaxies Revealed by the Three-Dimensional Voronoi's Tessellation Method
14 pages
KinematikaFiz.NebesnykhTel22:283-296,2006
null
null
astro-ph
null
3D Voronoi's tessellation method was first applied to identify groups of galaxies in the structure of a supercluster. The sample under consideration consists of more than 7000 galaxies of the Local Supercluster (LS) with radial velocities up to 3100 km/s. Because of an essential non-homogeneity of the LS catalogue, it was proposed to overscale distances in such an ''artificial'' way that the concentration of galaxies was varying as with increase of the distance a power-behaved function with the same exponent beta as for the full homogeneous catalogue. Various parameters of clustering were taking into account: alpha (0.01, 0.1, 1%) as the part of galaxies, which have the relative volume of a Voronoi's cell smaller than the critical one for the random distribution; beta = 0, which fits to the random galaxy distribution; beta = 0.7, which is close to the pancake galaxy distribution. It is revealed that Voronoi's tessellation method depends weakly on beta-parameter, and the number of galaxies in rich structures is growing rather than in poor ones with increase of alpha-parameter. The comparison of the groups derived with the groups obtained by Karachentsev's dynamical method shows that the number of groups, which coincides by all the components, is 22%. As a whole, the dynamical method is more preferred for identifying sparsely populated galaxy groups, whereas 3D Voronoi's tessellation method is preferred for more populated ones.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 18:40:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Melnyk", "O. V.", "" ], [ "Elyiv", "A. A.", "" ], [ "Vavilova", "I. B.", "" ] ]
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712.1298
William Wylie
Peter Petersen and William Wylie
On the classification of gradient Ricci solitons
14 pages. case. v.4--Added formula for the f-laplacian of the curvature operator and applications
Geom. Topol. 14 (2010) 2277-2300
10.2140/gt.2010.14.2277
null
math.DG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the only complete shrinking gradient Ricci solitons with vanishing Weyl tensor are quotients of the standard ones. This gives a new proof of the Hamilton-Ivey-Perel'man classification of 3-dimensional shrinking gradient solitons. We also prove a classification for expanding gradient Ricci solitons with constant scalar curvature and suitably decaying Weyl tensor.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 19:10:42 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 18:56:28 GMT" }, { "version": "v3", "created": "Sat, 10 May 2008 01:42:21 GMT" }, { "version": "v4", "created": "Thu, 26 Jun 2008 05:07:36 GMT" }, { "version": "v5", "created": "Wed, 24 Sep 2008 16:02:06 GMT" } ]
2014-11-11T00:00:00
[ [ "Petersen", "Peter", "" ], [ "Wylie", "William", "" ] ]
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712.1299
Kevin Zumbrun
Jeffrey Humpherys, Gregory Lyng, and Kevin Zumbrun
Stability of strong ideal-gas shock layers
null
null
10.1007/s00205-008-0195-4
null
math-ph math.MP
null
Extending recent results in the isentropic case, we use a combination of asymptotic ODE estimates and numerical Evans-function computations to examine the spectral stability of shock-wave solutions of the compressible Navier--Stokes equations with ideal gas equation of state. Our main results are that, in appropriately rescaled coordinates, the Evans function associated with the linearized operator about the wave (i) converges in the large-amplitude limit to the Evans function for a limiting shock profile of the same equations, for which internal energy vanishes at one endstate; and (ii) has no unstable (positive real part) zeros outside a uniform ball $|\lambda|\le \Lambda$. Thus, the rescaled eigenvalue ODE for the set of all shock waves, augmented with the (nonphysical) limiting case, form a compact family of boundary-value problems that can be conveniently investigated numerically. An extensive numerical Evans-function study yields one-dimensional spectral stability, independent of amplitude, for gas constant $\gamma$ in $[1.2, 3]$ and ratio $\nu/\mu$ of heat conduction to viscosity coefficient within $[0.2,5]$ ($\gamma\approx 1.4$, $\nu/\mu\approx 1.47$ for air). Other values may be treated similarly but were not considered. The method of analysis extends also to the multi-dimensional case, a direction that we shall pursue in a future work.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 19:25:50 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 19:34:52 GMT" } ]
2017-06-09T00:00:00
[ [ "Humpherys", "Jeffrey", "" ], [ "Lyng", "Gregory", "" ], [ "Zumbrun", "Kevin", "" ] ]
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712.13
Robyn Miller
John H. Hubbard, Robyn L. Miller
Equidistribution of Horocyclic Flows on Complete Hyperbolic Surfaces of Finite Area
29 pages, 10 figures
null
null
null
math.DS math.PR
null
We provide a self-contained, accessible introduction to Ratner's Equidistribution Theorem in the special case of horocyclic flow on a complete hyperbolic surface of finite area. This equidistribution result was first obtained in the early 1980s by Dani and Smillie and later reappeared as an illustrative special case of Ratner's work on the equidistribution of unipotent flows in homogeneous spaces. We also prove an interesting probabilistic result due to Breuillard: on the modular surface an arbitrary uncentered random walk on the horocycle through almost any point will fail to equidistribute, even though the horocycles are themselves equidistributed. In many aspects of this exposition we are indebted to Bekka and Mayer's more ambitious survey, "Ergodic Theory and Topological Dynamics for Group Actions on Homogeneous Spaces."
[ { "version": "v1", "created": "Sat, 8 Dec 2007 22:13:16 GMT" }, { "version": "v2", "created": "Sun, 2 Mar 2008 23:38:06 GMT" } ]
2008-03-03T00:00:00
[ [ "Hubbard", "John H.", "" ], [ "Miller", "Robyn L.", "" ] ]
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712.1301
Vladimir Nikiforov
Vladimir Nikiforov
The maximum spectral radius of C_4-free graphs of given order and size
null
null
null
null
math.CO
null
Let G be a graph of n vertices and m edges, and let G has no cycles of length 4. We give upper bounds on the adjacency spectral radius of G in terms of n and m.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 19:39:32 GMT" } ]
2007-12-11T00:00:00
[ [ "Nikiforov", "Vladimir", "" ] ]
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712.1302
Jean-Francois Bony
Bernard Bercu, Jean-Francois Bony, Vincent Bruneau
Spectrum of the product of Toeplitz matrices with application in probability
16 pages
null
null
null
math.FA math.PR
null
We study the spectrum of the product of two Toeplitz operators. Assume that the symbols of these operators are continuous and real-valued and that one of them is non-negative. We prove that the spectrum of the product of finite section Toeplitz matrices converges to the spectrum of the product of the semi-infinite Toeplitz operators. We give an example showing that the supremum of this set is not always the supremum of the product of the two symbols. Finally, we provide an application in probability which is the first motivation of this study. More precisely, we obtain a large deviation principle for Gaussian quadratic forms.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 14:09:03 GMT" } ]
2007-12-11T00:00:00
[ [ "Bercu", "Bernard", "" ], [ "Bony", "Jean-Francois", "" ], [ "Bruneau", "Vincent", "" ] ]
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712.1303
Ilya Zaliapin
Ilya Zaliapin, Andrei Gabrielov, Vladimir Keilis-Borok, and Henry Wong
Aftershock identification
4 pages, 5 figures
Phys. Rev. Lett., 101, 018501, 2008
10.1103/PhysRevLett.101.018501
SCEC publication 1137
physics.geo-ph physics.data-an
null
Earthquake aftershock identification is closely related to the question "Are aftershocks different from the rest of earthquakes?" We give a positive answer to this question and introduce a general statistical procedure for clustering analysis of seismicity that can be used, in particular, for aftershock detection. The proposed approach expands the analysis of Baiesi and Paczuski [PRE, 69, 066106 (2004)] based on the space-time-magnitude nearest-neighbor distance $\eta$ between earthquakes. We show that for a homogeneous Poisson marked point field with exponential marks, the distance $\eta$ has Weibull distribution, which bridges our results with classical correlation analysis for unmarked point fields. We introduce a 2D distribution of spatial and temporal components of $\eta$, which allows us to identify the clustered part of a point field. The proposed technique is applied to several synthetic seismicity models and to the observed seismicity of Southern California.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 19:50:14 GMT" } ]
2010-03-01T00:00:00
[ [ "Zaliapin", "Ilya", "" ], [ "Gabrielov", "Andrei", "" ], [ "Keilis-Borok", "Vladimir", "" ], [ "Wong", "Henry", "" ] ]
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712.1304
Hamad Alyahyaei
R. A. Jishi and H. M. Alyahyaei
Electronic structure of copper intercalated transition metal dichalcogenides: First-principles calculations
8 pages, 6 figures
R. A. Jishi and H. M. Alyahyaei, Phys. Rev. B 78, 144516 (2008)
10.1103/PhysRevB.78.144516
null
cond-mat.supr-con cond-mat.str-el
null
We report first principles calculations, within density functional theory, of copper intercalated titanium diselenides, CuxTiSe2, for values of x ranging from 0 to 0.11. The effect of intercalation on the energy bands and densities of states of the host material is studied in order to better understand the cause of the superconductivity that was recently observed in these structures. We find that charge transfer from the copper atoms to the metal dichalcogenide host layers causes a gradual reduction in the number of holes in the otherwise semi-metallic pristine TiSe2, thus suppressing the charge density wave transition at low temperatures, and a corresponding increase in the density of states at the Fermi level. These effects are probably what drive the superconducting transition in the intercalated systems.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 19:55:33 GMT" }, { "version": "v2", "created": "Tue, 20 May 2008 20:39:39 GMT" } ]
2009-01-12T00:00:00
[ [ "Jishi", "R. A.", "" ], [ "Alyahyaei", "H. M.", "" ] ]
[ 0.0343595743, -0.1463358104, -0.0086194724, 0.0305970572, 0.0800776854, 0.0347618535, 0.1071488634, 0.0137367304, -0.0004603313, -0.1258904487, 0.0394709148, -0.0778059736, -0.057739228, -0.0201850664, 0.0248467997, -0.0158782881, -0.0759128854, 0.0031443033, 0.028420005, 0.0835325718, -0.0053302301, -0.0479424894, 0.0108438525, 0.0318748951, -0.0491256714, -0.0538110659, 0.0089566791, 0.0389976427, 0.0929033607, -0.0414349958, 0.0753922835, -0.0539530478, -0.0178542007, -0.1072435156, -0.1330841929, 0.0826806799, -0.0203152169, 0.1635629237, -0.098062031, 0.021048788, 0.0206465069, 0.058496464, -0.0315909311, -0.0497882515, -0.0758182332, -0.014008862, -0.0849523917, 0.0334840193, 0.0199720934, 0.0376961417, 0.058780428, -0.0181736592, 0.0248704627, -0.0095896814, 0.0627085865, -0.0463806912, -0.0941338688, 0.0380510986, -0.0349038355, -0.0540477037, -0.0630872026, -0.0439433381, 0.0273551419, 0.0160321016, -0.0655955523, 0.0196053069, -0.0488417074, 0.0501668714, 0.0883126259, 0.0099801309, -0.0309046842, -0.0382877328, 0.0049575279, -0.0474455543, -0.0028233654, -0.0863722041, 0.0186942574, 0.0151683791, 0.070091635, 0.0660214946, -0.0551835559, -0.0310230032, 0.0176648907, 0.0317092463, -0.0169076547, 0.020528188, 0.0391869508, -0.0305260681, -0.0637497902, -0.0684825107, 0.0215575565, 0.0123524088, -0.0230956916, 0.056082774, 0.0539057218, -0.0038956231, 0.0015751095, 0.0109148435, -0.0235334672, 0.0001800653, 0.0045138351, 0.0479661524, 0.0380747616, 0.0078030778, 0.0734045431, -0.0134645989, 0.021356415, -0.0198064484, -0.0759602115, -0.0916255265, 0.1153838038, 0.0398022048, -0.0165408682, 0.0106013007, -0.0503088534, -0.1096098796, -0.0196408033, -0.0523912497, -0.1200218722, 0.1907287538, -0.0566033758, 0.058638446, 0.057123974, 0.0665894225, 0.0213090889, -0.0957430005, 0.0336733274, -0.1691475362, -0.0749190152, -0.0576445721, 0.0813555196, -0.0118140616, -0.0335076824, -0.0121276043, 0.0399441868, 0.0048007565, 0.0172626097, -0.0142100025, 0.0187889133, -0.0250834357, 0.0000139578, -0.0906316563, 0.112828128, 0.0789418295, 0.0758655593, 0.0796044096, -0.0091104927, 0.151352495, -0.0058508296, 0.0380747616, -0.0348801725, 0.0051261312, 0.1879837811, -0.0041973344, -0.0047800508, -0.0914362222, 0.0361343436, 0.0825860277, 0.0704229251, -0.0161385871, 0.1280674934, -0.0674886405, -0.0512080677, -0.0174992457, -0.0078740688, -0.0601529181, -0.0409853868, 0.0499302335, -0.0621879883, -0.0922881067, -0.0207056664, -0.1189806685, -0.028278023, 0.0835798979, 0.0461440533, -0.0116129201, -0.0089803431, -0.1283514649, -0.0323008373, 0.1539081782, 0.0131569719, -0.0011861388, -0.0315199383, 0.0338626355, 0.0012556508, 0.0036234914, 0.0133699439, 0.0696656927, -0.0414823219, 0.0274971239, -0.0549469218, 0.0371992067, -0.0112461345, 0.0043629794, -0.1655506641, -0.0394235887, 0.0553728677, 0.1770985126, 0.0398258679, 0.0318512283, -0.0030082373, -0.014032525, -0.0251780897, 0.0820654258, -0.0407960787, -0.0309520122, -0.0141863385, -0.0051350049, -0.0417662859, -0.0608628243, 0.0013643554, 0.0302421041, 0.0054722116, 0.0368679166, 0.0176648907, 0.0509241074, -0.0608154982, -0.0487943813, 0.1403725892, 0.0619986802, -0.0018679468, 0.0298634861, -0.0070162625, 0.0096074287, 0.0701862946, 0.0944651663, -0.0840058401, -0.04271283, 0.0308810212, -0.0147069385, -0.0186469313, -0.0029860528, -0.0196526349, -0.0115182661, -0.0019300638, -0.05788121, -0.0037003984, -0.0143993115, -0.0031295135, -0.0439196751, -0.1267423332, -0.0663054585, -0.0922881067, 0.113396056, 0.0411983579, 0.0154286791, -0.0577865541, -0.0004070882, 0.0191320349, 0.1367757171, -0.0651222765, 0.1411298215, 0.0853310078, 0.0746350512, -0.1096098796, -0.0296741761 ]
712.1305
Hamid Kachkachi
P.-M. Dejardin, H. Kachkachi, and Yu. P. Kalmykov
Thermal and surface anisotropy effects on the magnetization reversal of a nanocluster
8 pages, 3 eps figures (Oral communication at ICFPM, Rome 9-12/10/07, by H. Kachkachi)
null
10.1088/0022-3727/41/13/134004
0712.1302v2
cond-mat.mtrl-sci cond-mat.stat-mech
null
The relaxation rate and temperature-dependent switching field curve of a spherical magnetic nanocluster are calculated by taking into account the effect of surface anisotropy via an effective anisotropy model. In particular, it is shown that surface anisotropy may change the thermally activated magnetization reversal by more than an order of magnitude, and that temperature-dependent switching field curves noticeably deviate from the Stoner-Wohlfarth astroid. With recent and future $\mu$-SQUID measurements in mind, we indicate how comparison of our results with experimental data on isolated clusters may allow one to obtain valuable information on surface anisotropy.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 19:58:08 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 10:18:59 GMT" }, { "version": "v3", "created": "Wed, 16 Jan 2008 22:08:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Dejardin", "P. -M.", "" ], [ "Kachkachi", "H.", "" ], [ "Kalmykov", "Yu. P.", "" ] ]
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712.1306
Tapan Nath
P. Dey, T. K. Nath, P. K. Manna and S. M. Yusuf
Enhanced grain surface effect on magnetic properties of nanometric La0.7Ca0.3MnO3 manganite : Evidence of surface spin freezing of manganite nanoparticles
41 pages, 10 figures
null
10.1063/1.3020524
null
cond-mat.mtrl-sci
null
We have investigated the effect of nanometric grain size on magnetic properties of single phase, nanocrystalline, granular La0.7Ca0.3MnO3 (LCMO) sample. We have considered core-shell structure of our LCMO nanoparticles, which can explain its magnetic properties. From the temperature dependence of field cooled (FC) and zero-field cooled (ZFC) dc magnetization (DCM), the magnetic properties could be distinguished into two regimes: a relatively high temperature regime T > 40 K where the broad maximum of ZFC curve (at T = Tmax) is associated with the blocking of core particle moments, whereas the sharp maximum (at T = TS) is related to the freezing of surface (shell) spins. The unusual shape of M (H) loop at T = 1.5 K, temperature dependent feature of coercive field and remanent magnetization give a strong support of surface spin freezing that are occurring at lower temperature regime (T < 40 K) in this LCMO nanoparticles. Additionally, waiting time (tw) dependence of ZFC relaxation measurements at T = 50 K show weak dependence of relaxation rate [S(t)] on tw and dM/dln(t) following a logarithmic variation on time. Both of these features strongly support the high temperature regime to be associated with the blocking of core moments. At T = 20 K, ZFC relaxation measurements indicates the existence of two different types of relaxation processes in the sample with S(t) attaining a maximum at the elapsed time very close to the wait time tw = 1000 sec, which is an unequivocal sign of glassy behavior. This age-dependent effect convincingly establish the surface spin freezing of our LCMO nanoparticles associated with a background of superparamagnetic (SPM) phase of core moments.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 20:19:53 GMT" } ]
2009-11-13T00:00:00
[ [ "Dey", "P.", "" ], [ "Nath", "T. K.", "" ], [ "Manna", "P. K.", "" ], [ "Yusuf", "S. M.", "" ] ]
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712.1307
Alejandro Fernandez-Martinez
Alejandro Fernandez-Martinez (ILL, LGIT), Gabriel J. Cuello (ILL), Gabriela Roman-Ross (LGIT), Mark R. Johnson (ILL), Fabrizio Bardelli (GILDA, ESRF), Xavier Turrillas (ICC), Laurent Charlet (LGIT)
Arsenic uptake by gypsum and calcite: Modeling and probing by neutron and x-ray scattering
Proceedings of the Eighth International Conference on Neutron Scattering
Physica B: Condensed Matter 385-386, 2 (2006) 935-937
10.1016/j.physb.2006.05.276
null
physics.chem-ph
null
Here we report on two structural studies performed on As-doped gypsum (CaSO4 2H2O) and calcite (CaCO3), using neutron (D20-ILL) and x-ray (ID11-ESRF) diffraction data and EXAFS (BM8-ESRF). The aim of this study is to determine whether As gets into the bulk of gypsum and calcite structures or is simply adsorbed on the surface. Different mechanisms of substitution are used as hypotheses. The combined Rietveld analysis of neutron and x-ray diffraction data shows an expansion of the unit cell volume proportional to the As concentration within the samples. DFT-based simulations confirm the increase of the unit cell volume proportional to the amount of carbonate or sulphate groups substituted. Interpolation of the experimental Rietveld data allows us to distinguish As substituted within the structure from that adsorbed on the surface of both minerals.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 21:23:51 GMT" } ]
2007-12-11T00:00:00
[ [ "Fernandez-Martinez", "Alejandro", "", "ILL, LGIT" ], [ "Cuello", "Gabriel J.", "", "ILL" ], [ "Roman-Ross", "Gabriela", "", "LGIT" ], [ "Johnson", "Mark R.", "", "ILL" ], [ "Bardelli", "Fabrizio", "", "GILDA,\n ESRF" ], [ "Turrillas", "Xavier", "", "ICC" ], [ "Charlet", "Laurent", "", "LGIT" ] ]
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712.1308
J. M. Wrobel
J.M. Wrobel, Y. Terashima, L.C. Ho
Outflow-Dominated Emission from the Quiescent Massive Black Holes in NGC 4621 and NGC 4697
11 pages; 4 figures: emulateapj; to appear in ApJ
null
10.1086/527542
null
astro-ph
null
The nearby elliptical galaxies NGC 4621 and NGC 4697 each host a supermassive black hole with a mass more than 1e8 Solar masses. Analysis of archival Chandra data and new NRAO Very Large Array data shows that each galaxy contains a low-luminosity active galactic nucleus (LLAGN), identified as a faint, hard X-ray source that is astrometrically coincident with a faint 8.5-GHz source. The latter has a diameter less than 0.3 arcsec (26 pc for NGC 4621, 17 pc for NGC 4697). The black holes energizing these LLAGNs have Eddington ratios L(2-10 keV) / L(Edd) ~ 1e-9, placing them in the so-called quiescent regime. The emission from these quiescent black holes is radio-loud, with log Rx = log nuLnu(8.5 GHz) / L(2-10 keV) ~ -2, suggesting the presence of a radio outflow. Also, application of the radio-X-ray-mass relation from Yuan & Cui for quiescent black holes predicts the observed radio luminosities nuLnu(8.5 GHz) to within a factor of a few. Significantly, that relation invokes X-ray emission from the outflow rather than from an accretion flow. The faint, but detectable, emission from these two massive black holes is therefore consistent with being outflow-dominated. Observational tests of this finding are suggested.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 21:37:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Wrobel", "J. M.", "" ], [ "Terashima", "Y.", "" ], [ "Ho", "L. C.", "" ] ]
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712.1309
Jarek Duda
Jarek Duda
Complex base numeral systems
19 pages, 7 figures
null
null
null
math.DS cs.DM
null
In this paper will be introduced large, probably complete family of complex base systems, which are 'proper' - for each point of the space there is a representation which is unique for all but some zero measure set. The condition defining this family is the periodicity - we get periodic covering of the plane by fractals in hexagonal-type structure, what can be used for example in image compression. There will be introduced full methodology of analyzing and using this approach - both for the integer part: periodic lattice and the fractional: attractor of some IFS, for which the convex hull or properties like dimension of the boundary can be found analytically. There will be also shown how to generalize this approach to higher dimensions and found some proper systems in dimension 3.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 09:51:48 GMT" }, { "version": "v2", "created": "Mon, 10 Dec 2007 21:49:02 GMT" }, { "version": "v3", "created": "Sun, 24 Feb 2008 20:41:34 GMT" } ]
2008-02-24T00:00:00
[ [ "Duda", "Jarek", "" ] ]
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712.131
Lev Cherbanski Dr.
Lev Cherbanski
About Algorithm for Transformation of Logic Functions (ATLF)
25 pages, in English, German and Russian
null
null
null
cs.LO cs.AI
null
In this article the algorithm for transformation of logic functions which are given by truth tables is considered. The suggested algorithm allows the transformation of many-valued logic functions with the required number of variables and can be looked in this sense as universal.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 22:36:44 GMT" } ]
2007-12-11T00:00:00
[ [ "Cherbanski", "Lev", "" ] ]
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712.1311
Bruce Knuteson
CDF Collaboration
Model-Independent and Quasi-Model-Independent Search for New Physics at CDF
40 pages. Version published in Physical Review D
Phys.Rev.D78:012002,2008
10.1103/PhysRevD.78.012002
null
hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data collected in Run II of the Fermilab Tevatron are searched for indications of new electroweak scale physics. Rather than focusing on particular new physics scenarios, CDF data are analyzed for discrepancies with respect to the standard model prediction. A model-independent approach (Vista) considers the gross features of the data, and is sensitive to new large cross section physics. A quasi-model-independent approach (Sleuth) searches for a significant excess of events with large summed transverse momentum, and is particularly sensitive to new electroweak scale physics that appears predominantly in one final state. This global search for new physics in over three hundred exclusive final states in 927 pb^-1 of ppbar collisions at sqrt(s)=1.96 TeV reveals no such significant indication of physics beyond the standard model.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 14:41:35 GMT" }, { "version": "v2", "created": "Sun, 13 Jul 2008 19:31:46 GMT" } ]
2015-03-13T00:00:00
[ [ "CDF Collaboration", "", "" ] ]
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712.1312
Ilya Zaliapin
Michael Ghil, Ilya Zaliapin, Sylvester Thompson
A delay differential model of ENSO variability: Parametric instability and the distribution of extremes
22 pages, 9 figures
Nonlin. Proc. Geophys., 15, 417-433, 2008
10.5194/npg-15-417-2008
null
physics.ao-ph
null
We consider a delay differential equation (DDE) model for El-Nino Southern Oscillation (ENSO) variability. The model combines two key mechanisms that participate in ENSO dynamics: delayed negative feedback and seasonal forcing. We perform stability analyses of the model in the three-dimensional space of its physically relevant parameters. Our results illustrate the role of these three parameters: strength of seasonal forcing $b$, atmosphere-ocean coupling $\kappa$, and propagation period $\tau$ of oceanic waves across the Tropical Pacific. Two regimes of variability, stable and unstable, are separated by a sharp neutral curve in the $(b,\tau)$ plane at constant $\kappa$. The detailed structure of the neutral curve becomes very irregular and possibly fractal, while individual trajectories within the unstable region become highly complex and possibly chaotic, as the atmosphere-ocean coupling $\kappa$ increases. In the unstable regime, spontaneous transitions occur in the mean ``temperature'' ({\it i.e.}, thermocline depth), period, and extreme annual values, for purely periodic, seasonal forcing. The model reproduces the Devil's bleachers characterizing other ENSO models, such as nonlinear, coupled systems of partial differential equations; some of the features of this behavior have been documented in general circulation models, as well as in observations. We expect, therefore, similar behavior in much more detailed and realistic models, where it is harder to describe its causes as completely.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 23:01:45 GMT" } ]
2020-01-29T00:00:00
[ [ "Ghil", "Michael", "" ], [ "Zaliapin", "Ilya", "" ], [ "Thompson", "Sylvester", "" ] ]
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712.1313
Hongbao Zhang
Song He and Hongbao Zhang
The black hole dynamical horizon and generalized second law of thermodynamics
JHEP style, 8 pages, 2 figures, version to appear in JHEP with typos corrected
JHEP0712:052,2007
10.1088/1126-6708/2007/12/052
null
gr-qc astro-ph hep-th
null
The generalized second law of thermodynamics for a system containing a black hole dynamical horizon is proposed in a covariant way. Its validity is also tested in case of adiabatically collapsing thick light shells.
[ { "version": "v1", "created": "Sat, 8 Dec 2007 23:16:33 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 16:47:55 GMT" } ]
2008-11-26T00:00:00
[ [ "He", "Song", "" ], [ "Zhang", "Hongbao", "" ] ]
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712.1314
Zden\v{e}k Dole\v{z}al
N.S. Borisov (1), N.A. Bazhanov (1), A.A. Belyaev (4), J. Broz (2), J. Cerny (2), Z. Dolezal (2), A.N. Fedorov (1), G.M. Gurevich (3), M.P. Ivanov (1), P. Kodys (2), P. Kubik (2), E.S. Kuzmin (1), A.B. Lazarev (1), F. Lehar (5,6), O.O. Lukhanin (4), V.N. Matafonov (1), A.B. Neganov (1), I.L. Pisarev (1), J. Svejda (2), S.N. Shilov (1), Yu.A. Usov (1) and I.Wilhelm (2) ((1) Joint Institute for Nuclear Research, Dubna, Russia; (2) Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University in Prague; (3) Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia; (4) NSC KIPT, Kharkov, Ukraine (5) SPP DAPNIA CEA Saclay, France (6) IEAP CTU, Prague, Czech Republic)
Deuteron frozen spin polarized target for nd experiements at the VdG accelerator of Charles University
null
Nucl.Instrum.Meth.A593:177-182,2008
10.1016/j.nima.2008.05.026
null
nucl-ex
null
A frozen spin polarized deuteron target cooled by the 3He/4He dilution refrigerator is described. Fully deuterated 1,2-propanediol was used as a target material. Deuteron vector polarization about 40% was obtained for the target in the shape of a cylinder of 2 cm diameter and 6 cm length. The target is intended for a study of 3N interactions at the polarized neutron beam generated by the Van de Graaff accelerator at the Charles University in Prague.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 00:01:31 GMT" } ]
2008-11-26T00:00:00
[ [ "Borisov", "N. S.", "" ], [ "Bazhanov", "N. A.", "" ], [ "Belyaev", "A. A.", "" ], [ "Broz", "J.", "" ], [ "Cerny", "J.", "" ], [ "Dolezal", "Z.", "" ], [ "Fedorov", "A. N.", "" ], [ "Gurevich", "G. M.", "" ], [ "Ivanov", "M. P.", "" ], [ "Kodys", "P.", "" ], [ "Kubik", "P.", "" ], [ "Kuzmin", "E. S.", "" ], [ "Lazarev", "A. B.", "" ], [ "Lehar", "F.", "" ], [ "Lukhanin", "O. O.", "" ], [ "Matafonov", "V. N.", "" ], [ "Neganov", "A. B.", "" ], [ "Pisarev", "I. L.", "" ], [ "Svejda", "J.", "" ], [ "Shilov", "S. N.", "" ], [ "Usov", "Yu. A.", "" ], [ "Wilhelm", "I.", "" ] ]
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712.1315
Paul Wesson
Paul S. Wesson
The Meaning of Dimensions
null
Wesson P.S. (2008), The Meaning of Dimensions in Relativity and the Dimensionality of the World, Series: Fundamental Theories of Physics, Vol 153 Petkov, Vesselin (Ed.), 276 p
10.1007/978-1-4020-6318-3_1
null
gr-qc
null
We review the current status of dimensions, as the result of a long and controversial history that includes input from philosophy and physics. Our conclusion is that they are subjective but essential concepts which provide a kind of book-keeping device, their number increasing as required by advances in physics. The world almost certainly has more than the four dimensions of space and time, but the introduction of the fifth and higher dimensions requires a careful approach wherein known results are embedded and new ones are couched in the most productive manner.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 00:13:53 GMT" } ]
2015-05-13T00:00:00
[ [ "Wesson", "Paul S.", "" ] ]
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712.1316
Christopher J. Conselice
Nicola Atkinson, Christopher J. Conselice, Nicole Fox (Nottingham)
Hierarchical Disk Galaxy Assembly as the Origin of Scatter in the z~1 Stellar Mass Tully-Fisher Relation
12 pages, MNRAS, submitted
null
null
null
astro-ph
null
Recent observations of distant disk galaxies show that there is little to no evolution in the relation between maximum rotation speed and stellar mass at z < 1.2. There is however a significant scatter between these two quantities whose origin is uncertain. We show in this paper that this scatter is at least partially the result of galaxy merging, revealing that disk galaxy growth at z < 1 is fundamentally hierarchical. We carry this out by calculating CAS (concentration, asymmetry, clumpiness) structural parameters using archival Hubble Space Telescope imaging of 91 high-redshift disk galaxies at 0.4 < z < 1.0 with robustly measured stellar masses and rotational maximum velocities taken from Conselice et al. (2005). We separate our sample into two redshift bins divided at z = 0.7, and investigate deviations from the stellar-mass Tully-Fisher relation in both the M_* and V_max directions, and how these correlate with structural asymmetries. We find a significant (> 3 sigma) correlation between the residuals from the stellar-mass Tully-Fisher relation in both the M_* and V_max directions, and high asymmetries. This result holds after we remove contributions from star formation and edge-on galaxies which can produce higher asymmetries unrelated to merging. While there are a few cases in which our disk galaxies have very large asymmetries, and are potentially involved in major mergers, in general these asymmetries are smaller than the major merger limit. It is therefore likely that these galaxies are forming hierarchically through minor galaxy mergers, which is also suggested by the constant slope and zero point of the stellar mass Tully-Fisher relation during the same epoch.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 00:21:59 GMT" } ]
2007-12-11T00:00:00
[ [ "Atkinson", "Nicola", "", "Nottingham" ], [ "Conselice", "Christopher J.", "", "Nottingham" ], [ "Fox", "Nicole", "", "Nottingham" ] ]
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712.1317
Luis Dieulefait
Luis Dieulefait
How to facet a gemstone: from potential modularity to the proof of Serre's modularity conjecture
Survey based on two talks I gave last summer, at the Segundas Jornadas de Teoria de Numeros (Madrid) and at the Summer School on Serre's Modularity Conjecture (Luminy)
null
null
null
math.NT
null
In this survey paper we present recent results obtained by Khare, Wintenberger and the author that have led to a proof of Serre's conjecture, such as existence of compatible families, modular upper bounds for universal deformation rings and existence of minimal lifts, prime switching and modularity propagation, weight reduction (via existence of conjugates) and (iterated) killing ramification. The main tools used in the proof of these results are modularity lifting theorems a la Wiles and a result of potential modularity due to R. Taylor.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 00:28:41 GMT" } ]
2007-12-11T00:00:00
[ [ "Dieulefait", "Luis", "" ] ]
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712.1318
Laszlo E. Szabo
Laszlo E. Szabo
The Einstein-Podolsky-Rosen Argument and the Bell Inequalities
(Review, forthcoming in The Internet Encyclopedia of Philosophy) 28 pages, LaTeX, 11 figures
null
null
null
quant-ph
null
In 1935 Einstein, Podolsky, and Rosen (EPR) published an important paper in which they claimed that the whole formalism of quantum mechanics together with what they called "Reality Criterion" imply that quantum mechanics cannot be complete. That is, there must exist some elements of reality that are not described by quantum mechanics. There must be, they concluded, a more complete description of physical reality behind quantum mechanics. There must be a state, a hidden variable, characterizing the state of affairs in the world in more details than the quantum mechanical state, something that also reflects the missing elements of reality. Under some further but quite plausible assumptions, this conclusion implies that in some spin-correlation experiments the measured quantum mechanical probabilities should satisfy particular inequalities (Bell-type inequalities). The paradox consists in the fact that quantum probabilities do not satisfy these inequalities. And this paradoxical fact has been confirmed by several laboratory experiments in the last three decades. The problem is still open and hotly debated among both physicists and philosophers. It has motivated a wide range of research from the most fundamental quantum mechanical experiments through foundations of probability theory to the theory of stochastic causality as well as the metaphysics of free will.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 02:18:42 GMT" } ]
2007-12-11T00:00:00
[ [ "Szabo", "Laszlo E.", "" ] ]
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712.1319
Alexandru E. Stanculescu
Alexandru E. Stanculescu
A homotopy theory for enrichment in simplicial modules
6 pages, comments are welcome
null
null
null
math.CT
null
We put a Quillen model structure on the category of small categories enriched in simplicial $k$-modules and non-negatively graded chain complexes of $k$-modules, where $k$ is a commutative ring. The model structure is obtained by transfer from the model structure on simplicial categories due to J. Bergner.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 01:42:29 GMT" } ]
2007-12-11T00:00:00
[ [ "Stanculescu", "Alexandru E.", "" ] ]
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712.132
Timothy Y. Chow
Timothy Y. Chow
A beginner's guide to forcing
Accepted version (Contemp. Math.); bugs fixed, exposition improved, new references
null
null
null
math.LO math.HO
null
This expository paper, aimed at the reader without much background in set theory or logic, gives an overview of Cohen's proof (via forcing) of the independence of the continuum hypothesis. It emphasizes the broad outlines and the intuitive motivation while omitting most of the proofs. The reader must of course consult standard textbooks for the missing details, but this article provides a map of the forest so that the beginner will not get lost while forging through the trees.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:47:29 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 14:40:05 GMT" } ]
2008-05-08T00:00:00
[ [ "Chow", "Timothy Y.", "" ] ]
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712.1321
Jeffrey Case
Jeffrey S. Case
Singularity theorems and the Lorentzian splitting theorem for the Bakry-Emery-Ricci tensor
Correction to one of the examples
J. Geom. Phys., Volume 60, Issue 3, March 2010, 477-490
10.1016/j.geomphys.2009.11.001
null
math.DG
null
We consider the Hawking-Penrose singularity theorems and the Lorentzian splitting theorem under the weaker curvature condition of nonnegative Bakry-Emery-Ricci curvature $Ric_f^m$ in timelike directions. We prove that they still hold when $m$ is finite, and when $m$ is infinite, they hold under the additional assumption that $f$ is bounded from above.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:40:58 GMT" }, { "version": "v2", "created": "Tue, 3 Jun 2008 05:51:34 GMT" } ]
2010-12-15T00:00:00
[ [ "Case", "Jeffrey S.", "" ] ]
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712.1322
Paul SanGiorgio
P. SanGiorgio, S. Reymond, M. R. Beasley, J.H. Kwon, K. Char
Anomalous double peak structure in Nb/Ni superconductor/ferromagnet tunneling DOS
4 pages, 3 figures
null
10.1103/PhysRevLett.100.237002
null
cond-mat.supr-con
null
We have experimentally investigated the density of states (DOS) in Nb/Ni (S/F) bilayers as a function of Ni thickness, $d_F$. Our thinnest samples show the usual DOS peak at $\pm\Delta_0$, whereas intermediate-thickness samples have an anomalous ``double-peak'' structure. For thicker samples ($d_F \geq 3.5$ nm), we see an ``inverted'' DOS which has previously only been reported in superconductor/weak-ferromagnet structures. We analyze the data using the self-consistent non-linear Usadel equation and find that we are able to quantitatively fit the features at $\pm\Delta_0$ if we include a large amount of spin-orbit scattering in the model. Interestingly, we are unable to reproduce the sub-gap structure through the addition of any parameter(s). Therefore, the observed anomalous sub-gap structure represents new physics beyond that contained in the present Usadel theory.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 01:56:32 GMT" } ]
2009-11-13T00:00:00
[ [ "SanGiorgio", "P.", "" ], [ "Reymond", "S.", "" ], [ "Beasley", "M. R.", "" ], [ "Kwon", "J. H.", "" ], [ "Char", "K.", "" ] ]
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712.1323
Daniel H. Lenz
Daniel Lenz
Aperiodic order via dynamical systems: Diffraction for sets of finite local complexity
22 pages
null
null
null
math.DS math-ph math.MP
null
We give an introduction into diffraction theory for aperiodic order. We focus on an approach via dynamical systems and the phenomenon of pure point diffraction. We review recent results and sketch proofs. We then present a new uniform Wiener/Wintner type result generalizing various earlier results of this type.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 03:30:09 GMT" } ]
2007-12-11T00:00:00
[ [ "Lenz", "Daniel", "" ] ]
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712.1324
Ji Wei He
J.-W. He and Q.-S. Wu
Koszul differential graded algebras and BGG correspondence
29 pages
null
null
null
math.RA math.KT
null
The concept of Koszul differential graded algebra (Koszul DG algebra) is introduced. Koszul DG algebras exist extensively, and have nice properties similar to the classic Koszul algebras. A DG version of the Koszul duality is proved. When the Koszul DG algebra $A$ is AS-regular, the Ext-algebra $E$ of $A$ is Frobenius. In this case, similar to the classical BGG correspondence, there is an equivalence between the stable category of finitely generated left $E$-modules, and the quotient triangulated category of the full triangulated subcategory of the derived category of right DG $A$-modules consisting of all compact DG modules modulo the full triangulated subcategory consisting of all the right DG modules with finite dimensional cohomology. The classical BGG correspondence can derived from the DG version.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 03:34:43 GMT" }, { "version": "v2", "created": "Thu, 13 Dec 2007 11:55:27 GMT" }, { "version": "v3", "created": "Fri, 1 Feb 2008 12:40:00 GMT" } ]
2008-02-01T00:00:00
[ [ "He", "J. -W.", "" ], [ "Wu", "Q. -S.", "" ] ]
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712.1325
Giacomo Mauro D'Ariano
Giulio Chiribella, Giacomo Mauro D'Ariano, and Paolo Perinotti
Quantum Circuits Architecture
10 eps figures + Qcircuit.tex
Phys. Rev. Lett. 101, 060401 (2008)
10.1103/PhysRevLett.101.060401
null
quant-ph
null
We present a method for optimizing quantum circuits architecture. The method is based on the notion of "quantum comb", which describes a circuit board in which one can insert variable subcircuits. The method allows one to efficiently address novel kinds of quantum information processing tasks, such as storing-retrieving, and cloning of channels.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 03:55:02 GMT" } ]
2008-09-08T00:00:00
[ [ "Chiribella", "Giulio", "" ], [ "D'Ariano", "Giacomo Mauro", "" ], [ "Perinotti", "Paolo", "" ] ]
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712.1326
Chitta Ranjan Das
C.R. Das and L.V. Laperashvili
Mirror World with Broken Mirror Parity, E(6) Unification and Cosmology
31 pages, 7 figures
Int.J.Mod.Phys.A23:1863-1890,2008
10.1142/S0217751X08039712
CHEP-PKU/2/12-2007
hep-ph astro-ph
null
In the present paper we have developed a concept of parallel ordinary (O) and mirror (M) worlds. We have shown that in the case of a broken mirror parity (MP), the evolutions of fine structure constants in the O- and M-worlds are not identical. It is assumed that E_6-unification inspired by superstring theory restores the broken MP at the scale \sim 10^{18} GeV, what unavoidably leads to the different E_6-breakdowns at this scale: E_6 \to SO(10)\times U(1)_Z - in the O-world, and E'_6 \to SU(6)'\times SU(2)'_Z - in the M-world. Considering only asymptotically free theories, we have presented the running of all the inverse gauge constants \alpha_i^{-1} in the one-loop approximation. Then a `quintessence' scenario is discussed for our model of accelerating universe. Such a scenario is related with an axion (`acceleron') of a new gauge group SU(2)'_Z which has a coupling constant g_Z extremely growing at the scale \Lambda_Z\sim 10^{-3} eV.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 03:56:29 GMT" }, { "version": "v2", "created": "Sun, 27 Jan 2008 02:27:53 GMT" } ]
2008-06-22T00:00:00
[ [ "Das", "C. R.", "" ], [ "Laperashvili", "L. V.", "" ] ]
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712.1327
Corey Hoelscher
Corey A. Hoelscher
Classification of Cohomogeneity One Manifolds in Low Dimensions
null
null
null
null
math.DG
null
A cohomogeneity one manifold is a manifold with the action of a compact Lie group, whose quotient is one dimensional. Such manifolds are of interest in Riemannian geometry, in the context of nonnegative sectional curvature, as well as in other areas of geometry and in physics. In this paper we classify compact simply connected cohomogeneity one manifolds in dimensions 5, 6 and 7. We also show that all such manifolds admit metrics of nonnegative sectional curvature, with the possible exception of two families of manifolds.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 04:35:22 GMT" } ]
2007-12-11T00:00:00
[ [ "Hoelscher", "Corey A.", "" ] ]
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712.1328
Zhaoyong Huang
Rong Luo and Zhaoyong Huang
When Are Torsionless Modules Projective?
10 pages
null
null
null
math.RA math.RT
null
In this paper, we study the problem when a finitely generated torsionless module is projective. Let $\Lambda$ be an Artinian local algebra with radical square zero. Then a finitely generated torsionless $\Lambda$-module $M$ is projective if ${\rm Ext^1_\Lambda}(M,M)=0$. For a commutative Artinian ring $\Lambda$, a finitely generated torsionless $\Lambda$-module $M$ is projective if the following conditions are satisfied: (1) ${\rm Ext}^i_{\Lambda}(M,\Lambda)=0$ for $i=1,2,3$; and (2) ${\rm Ext}^i_{\Lambda}(M,M)=0$ for $i=1,2$. As a consequence of this result, we have that for a commutative Artinian ring $\Lambda$, a finitely generated Gorenstein projective $\Lambda$-module is projective if and only if it is selforthogonal.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 06:10:17 GMT" } ]
2007-12-11T00:00:00
[ [ "Luo", "Rong", "" ], [ "Huang", "Zhaoyong", "" ] ]
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712.1329
Qi Zhang S.
Qi S. Zhang
Strong non-collapsing and uniform Sobolev inequalities for Ricci flow with surgeries
null
null
null
null
math.DG math.AP
null
We prove a uniform Sobolev inequality for Ricci flow, which is independent of the number of surgeries. As an application, under less assumptions, a non-collapsing result stronger than Perelman's $\kappa$ non-collapsing with surgery is derived. The proof is shorter and seems more accessible. The result also improves some earlier ones where the Sobolev inequality depended on the number of surgeries.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 06:22:27 GMT" } ]
2007-12-11T00:00:00
[ [ "Zhang", "Qi S.", "" ] ]
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712.133
Manuel Guedel
M. Guedel, S. L. Skinner, M. Audard, K. R. Briggs, S. Cabrit
Discovery of a bipolar X-ray jet from the T Tauri star DG Tau
accepted by Astronomy & Astrophysics, 11 pages, 6 figures
null
10.1051/0004-6361:20078141
null
astro-ph
null
We have obtained and analyzed Chandra ACIS-S observations of the strongly accreting classical T Tauri star DG Tau. Our principal goals are to map the immediate environment of the star to characterize possible extended X-rays formed in the jet, and to re-visit the anomalous, doubly absorbed X-ray spectrum of DG Tau itself. We combine our new ACIS-S data with a data set previously obtained. The data are superimposed to obtain flux and hardness images. Separate X-ray spectra are extracted for DG Tau and areas outside its point spread function. We detect a prominent X-ray jet at a position angle of PA ~225 deg (tentatively suggested by Guedel et al. 2005), coincident with the optical jet axis. We also identify a counter jet at PA = 45 deg. The X-ray jets are detected out to a distance of ~5" from the star, their sources being extended at the ACIS-S resolution. The jet spectra are soft, with a best-fit electron temperature of 3.4 MK. We find evidence for excess absorption of the counter jet. The spectrum of the DG Tau point source shows two components with largely different temperatures and absorption column densities. The similar temperatures and small absorbing gas columns of the jet sources and the soft component of the "stellar" source suggest that these sources are related, produced either by shocks or by magnetic heating in the jets. Cooling estimates suggest that the pressure in the hot gas contributes to jet expansion. The hard "stellar" component, on the other hand, is associated with a stellar corona or magnetosphere. The excessive photoelectric absorption of this component suggests the presence of dust-depleted accretion streams above coronal magnetic fields.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 08:10:50 GMT" } ]
2009-11-13T00:00:00
[ [ "Guedel", "M.", "" ], [ "Skinner", "S. L.", "" ], [ "Audard", "M.", "" ], [ "Briggs", "K. R.", "" ], [ "Cabrit", "S.", "" ] ]
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712.1331
Maria J. Esteban
Maria J. Esteban (CEREMADE), Patricio Felmer (CMM), Alexander Quaas
Super-linear elliptic equation for the Pucci operator without growth restrictions for the data
null
null
null
null
math.AP
null
In this paper we deal with existence and uniqueness of solution to super-linear problems for the Pucci operator: $$ -\M^+(D^2u)+|u|^{s-1}u=f(x) \quad {in} \RR^n, $$ where $s>1$ and $f$ satisfies only local integrability conditions. This result is well known when, instead of the Pucci operator, the Laplacian or a divergence form operator is considered. Our existence results use the Alexandroff-Bakelman-Pucci inequality since we cannot use any variational formulation. For radially symmetric $f$ we can prove our results under less local integrability assumptions, taking advantage of an appropriate variational formulation. We also obtain an existence result with boundary explosion in smooth domains.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 08:28:26 GMT" } ]
2007-12-11T00:00:00
[ [ "Esteban", "Maria J.", "", "CEREMADE" ], [ "Felmer", "Patricio", "", "CMM" ], [ "Quaas", "Alexander", "" ] ]
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712.1332
Wadim Zudilin
Wadim Zudilin
Ramanujan-type formulae for $1/\pi$: A second wind?
13 pages; v2: two typos corrected, references updated, numeration of formulae changed to agree with the published version
Modular Forms and String Duality, N. Yui, H. Verrill, and C.F. Doran (eds.), Fields Inst. Commun. Ser. 54 (2008), Amer. Math. Soc. & Fields Inst., 179--188
null
null
math.NT math.CA
null
In 1914 S. Ramanujan recorded a list of 17 series for $1/\pi$. We survey the methods of proofs of Ramanujan's formulae and indicate recently discovered generalizations, some of which are not yet proven.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 10:12:48 GMT" }, { "version": "v2", "created": "Mon, 19 May 2008 05:12:25 GMT" } ]
2009-02-24T00:00:00
[ [ "Zudilin", "Wadim", "" ] ]
[ -0.0027478889, -0.0288900845, 0.0696073398, -0.0417924523, -0.0166188106, -0.0727394372, -0.0447141863, 0.0877922028, -0.0290770754, 0.0620809607, 0.0433351286, -0.029497806, -0.0847536027, 0.050768014, 0.0864365175, -0.0274175331, 0.0531521477, 0.0159760304, -0.058855366, 0.0392680764, -0.0240283236, -0.0627821758, -0.0136620188, 0.0544610843, 0.0522639416, 0.0416989587, -0.0264124572, 0.0413249768, 0.0497395657, -0.055442784, 0.0108688427, -0.05633099, 0.0038011733, -0.0634366423, -0.0337752216, 0.0499265566, -0.021772746, -0.0042657284, -0.0896621123, 0.0623146966, -0.0582943968, 0.0107285995, -0.00433585, 0.0124582648, 0.0510017537, 0.0240283236, -0.0084847091, 0.0054899342, -0.0131477937, -0.015695544, -0.0476592928, 0.0221467279, 0.0992921367, 0.1124749929, -0.0537598655, -0.0162565168, -0.0223687794, 0.0595098361, -0.0112720421, -0.0199262109, 0.121076569, -0.1321090311, -0.0271604192, -0.1191131696, -0.1247228906, 0.0637638792, -0.0387304798, 0.0250801463, 0.0613797456, 0.1002270952, -0.0655870363, -0.0327701457, 0.0731601641, 0.0169460457, 0.0032664964, 0.0409743674, -0.0576866753, 0.0595098361, -0.036135979, 0.0313910879, 0.0551622994, -0.0547883175, -0.0291471984, -0.0648858249, 0.0576399267, -0.0156371091, 0.0819954872, -0.0732536614, -0.0410912372, -0.0281187482, 0.0100215403, -0.0782556683, -0.0057879509, -0.012282961, -0.0104364268, -0.0189561974, 0.0512354895, 0.0706825405, 0.0689061284, 0.052030202, 0.0612862483, -0.0097994888, 0.0487111136, 0.1385602206, 0.1602511555, 0.1624950469, -0.006649862, -0.013802262, -0.0812942684, -0.0386837311, -0.012469952, 0.0198677778, -0.1005075797, -0.0096417153, 0.006930348, 0.0184069108, 0.063343145, -0.0532456413, -0.1351008862, 0.0701683164, -0.0338920914, -0.0906438082, 0.0192951169, -0.0505810231, 0.0762922615, -0.1404301226, -0.0119674141, -0.0387538522, 0.0727861822, 0.0064044362, 0.0459763743, -0.0287732165, 0.1137839258, -0.0341492034, -0.0352244005, -0.0576399267, 0.0869039968, 0.0632029027, 0.0850808322, 0.1322960258, 0.0406471342, -0.0269266814, 0.0008735979, -0.0132646626, 0.0586216301, -0.0252203904, -0.0339388363, -0.047729414, -0.0341492034, -0.1226659939, -0.0528716594, 0.0168876108, -0.0172499046, -0.0340089612, 0.0128088724, -0.0900360942, -0.0319520608, 0.0248230342, 0.0407406315, -0.0201365761, -0.0690931156, 0.0991051495, -0.0650728121, -0.0903165787, 0.1095766351, 0.0008297719, -0.0848003477, -0.1155603379, -0.002419194, -0.106210798, -0.0402965248, -0.00582009, -0.0710565224, -0.1475357711, 0.0973287299, 0.0078653023, -0.116401799, -0.0580606572, 0.0108104078, 0.0440363437, 0.0161045864, 0.0774142072, 0.0340557061, 0.027090298, 0.060070809, 0.0125050126, 0.098170191, -0.0365333371, 0.1342594177, -0.0585748814, 0.1097636223, 0.1150928661, 0.0797048435, 0.100694567, -0.0096417153, -0.1160278171, 0.0846601054, 0.0294510573, -0.1192066595, 0.011453189, -0.0610525087, -0.0718512312, 0.0310638528, 0.0195288565, 0.0051130308, 0.0487111136, 0.0500667989, 0.0432650074, -0.0733471587, -0.0233504809, 0.0219597369, 0.0065446794, 0.1380927414, 0.0150293894, -0.0502537899, 0.0508615077, -0.0440597162, 0.0472619347, 0.0424001738, 0.0980766937, -0.0536663719, 0.0221934766, 0.004809171, 0.1032189429, 0.0722252131, 0.0299652833, 0.1188326776, 0.0444103256, 0.029497806, -0.0020831949, -0.031835191, 0.0309469849, -0.054180596, 0.0072108344, -0.0430546403, 0.0392914526, 0.0416054614, 0.0034534871, -0.0659610182, -0.1124749929, 0.0223454051, 0.094804354, -0.0967677608, -0.0116986148, -0.0655870363, 0.018991258, -0.0931681842, 0.0927474573, 0.0341024548, -0.0553960353, 0.0485708714, 0.0391979553, 0.0208611656, -0.0064336536, -0.0661947578, -0.016455194 ]
712.1333
Andrei Martinez-Finkelshtein
A.B.J. Kuijlaars, A. Martinez-Finkelshtein, and F. Wielonsky
Non-intersecting squared Bessel paths and multiple orthogonal polynomials for modified Bessel weights
59 pages, 11 figures
null
10.1007/s00220-008-0652-9
null
math.CA math-ph math.MP math.PR
null
We study a model of $n$ non-intersecting squared Bessel processes in the confluent case: all paths start at time $t = 0$ at the same positive value $x = a$, remain positive, and are conditioned to end at time $t = T$ at $x = 0$. In the limit $n \to \infty$, after appropriate rescaling, the paths fill out a region in the $tx$-plane that we describe explicitly. In particular, the paths initially stay away from the hard edge at $x = 0$, but at a certain critical time $t^*$ the smallest paths hit the hard edge and from then on are stuck to it. For $t \neq t^*$ we obtain the usual scaling limits from random matrix theory, namely the sine, Airy, and Bessel kernels. A key fact is that the positions of the paths at any time $t$ constitute a multiple orthogonal polynomial ensemble, corresponding to a system of two modified Bessel-type weights. As a consequence, there is a $3 \times 3$ matrix valued Riemann-Hilbert problem characterizing this model, that we analyze in the large $n$ limit using the Deift-Zhou steepest descent method. There are some novel ingredients in the Riemann-Hilbert analysis that are of independent interest.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 10:26:32 GMT" } ]
2009-11-13T00:00:00
[ [ "Kuijlaars", "A. B. J.", "" ], [ "Martinez-Finkelshtein", "A.", "" ], [ "Wielonsky", "F.", "" ] ]
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712.1334
Hisaki Hatanaka
Hisaki Hatanaka
Radiatively Induced Spontaneous Symmetry Breaking by Wilson Line in a Warped Extra Dimension
32 pages, 11 figures
null
null
null
hep-th hep-ph
null
We investigate the dynamical gauge-Higgs unification in the Randall-Sundrum (RS) space-time. We study the dynamical gauge-Higgs unification in the SU(2) gauge theory with a bulk fermion in the RS space-time. We evaluate the contribution from fermion loop to the one-loop effective potential with respect to the Wilson-line phase, and study the dynamical gauge symmetry breaking. We also apply this mechanism of the gauge symmetry breaking to the electroweak gauge-Higgs unification in the RS space-time. Especially we numerically studied a SU(3)_w gauge model as a toy model of electroweak gauge-Higgs unification in the RS space-time. We introduce an adjoint fermion into the model to break the gauge symmetry and to obtain the U(1)_em electromagnetic symmetry. We found that in this model the ratio of Z-boson mass to W-boson varies with respect to the Wilson-line phase even at the tree level. We also propose a dynamical mechanism of tuning the ratio m_Z/m_W to the experimental value 91.2GeV/80.4GeV=1.13 by introducing bulk scalars or bulk fermions with twisted boundary conditions. In these models the Higgs can vary in mass between zero and 290GeV.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 18:54:58 GMT" } ]
2007-12-11T00:00:00
[ [ "Hatanaka", "Hisaki", "" ] ]
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712.1335
Yuri A. Rylov
Yuri A. Rylov
Discrimination of particle masses in multivariant space-time geometry
16 pages, 0 figures, removal of extra root
null
null
null
physics.gen-ph
null
Multivariance of geometry means that at the point $P_{0}$ there exist many vectors $P_{0}P_{1}$, $\P_{0}P_{2}$,... which are equivalent (equal) to the vector $\Q_{0}Q_{1}$ at the point $Q_{0}$, but they are not equivalent between themselves. The discrimination capacity (zero-variance) of geometry appears, when at the point $P_{0}$ there are no vectors, which are equivalent to the vector $Q_{0}Q_{1}$ at the point $Q_{0}$. It is shown, that in some multivariant space-time geometries some particles of small mass may be discriminated (i.e. either they do not exist, or their evolution is impossible). The possibility of some particle discrimination may appear to be important for explanation of the discrete character of mass spectrum of elementary particles.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 12:15:05 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 03:44:06 GMT" } ]
2007-12-11T00:00:00
[ [ "Rylov", "Yuri A.", "" ] ]
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712.1336
Daiji Kimura
T. Inagaki, D. Kimura, A. Kvinikhidze
$\pi$ and $\sigma$ mesons at finite temperature and density in the NJL model with dimensional regularization
28 pages, 9 figures, v2: a few points corrected and references added
Phys.Rev.D77:116004,2008
10.1103/PhysRevD.77.116004
HUPD-0704
hep-ph
null
Dynamical Symmetry breaking and meson masses are studied in the Nambu-Jona-Lasinio (NJL) model at finite temperature and chemical potential using the dimensional regularization. Since the model is not renormalizable in four space-time dimensions, physical results and parameters depend on the regularization method. Following the imaginary time formalism, we introduce the temperature, $T$ and the chemical potential, $\mu$. The parameters in the model are fixed by calculating the pion mass and decay constant in the dimensional regularization at $T=\mu=0$.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 12:22:26 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 10:18:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Inagaki", "T.", "" ], [ "Kimura", "D.", "" ], [ "Kvinikhidze", "A.", "" ] ]
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712.1337
Zoltan Esik
S. L. Bloom, Z. Esik
Axiomatizing rational power series
null
null
null
null
cs.LO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Iteration semirings are Conway semirings satisfying Conway's group identities. We show that the semirings $\N^{\rat}\llangle \Sigma^* \rrangle$ of rational power series with coefficients in the semiring $\N$ of natural numbers are the free partial iteration semirings. Moreover, we characterize the semirings $\N_\infty^{\rat}\llangle \Sigma^* \rrangle$ as the free semirings in the variety of iteration semirings defined by three additional simple identities, where $\N_\infty$ is the completion of $\N$ obtained by adding a point of infinity. We also show that this latter variety coincides with the variety generated by the complete, or continuous semirings. As a consequence of these results, we obtain that the semirings $\N_\infty^{\rat}\llangle \Sigma^* \rrangle$, equipped with the sum order, are free in the class of symmetric inductive $^*$-semirings. This characterization corresponds to Kozen's axiomatization of regular languages.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 12:45:00 GMT" }, { "version": "v2", "created": "Tue, 9 Dec 2008 14:11:09 GMT" } ]
2008-12-09T00:00:00
[ [ "Bloom", "S. L.", "" ], [ "Esik", "Z.", "" ] ]
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712.1338
Dipanjan Mitra
Dipanjan Mitra, Joanna M Rankin
On the Subpulse Modulation, Polarization and Subbeam Carousel Configuration of Pulsar B1857--26
Accepted for publication in MNRAS
AIPConf.Proc.983:109-111,2008
10.1063/1.2900116
null
astro-ph
null
New GMRT observations of the five-component pulsar B1857--26 provide detailed insight into its pulse-sequence modulation phenomena for the first time. The outer conal components exhibit a 7.4-rotation-period, longitude-stationary modulation. Several lines of evidence indicate a carousel circulation time $\P3hat$ of about 147 stellar rotations, characteristic of a pattern with 20 beamlets. The pulsar nulls some 20% of the time, usually for only a single pulse, and these nulls show no discernible order or periodicity. Finally, the pulsar's polarization-angle traverse raises interesting issues: if most of its emission is comprised of a single polarization mode, the full traverse exceeds 180\degr; or if both polarization modes are present, then the leading and the trailing halves of the profiles exhibit two different modes. In either case the rotating vector model fails to fit the polarization-angle traverse of the core component.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 06:00:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Mitra", "Dipanjan", "" ], [ "Rankin", "Joanna M", "" ] ]
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712.1339
Stefano Buzzi
Stefano Buzzi and H. Vincent Poor
Joint Receiver and Transmitter Optimization for Energy-Efficient CDMA Communications
To appear in the IEEE Journal on Selected Areas in Communications - Special Issue on Multiuser Detection for Advanced Communication Systems and Networks
null
null
null
cs.IT cs.GT math.IT
null
This paper focuses on the cross-layer issue of joint multiuser detection and resource allocation for energy efficiency in wireless CDMA networks. In particular, assuming that a linear multiuser detector is adopted in the uplink receiver, the case considered is that in which each terminal is allowed to vary its transmit power, spreading code, and uplink receiver in order to maximize its own utility, which is defined as the ratio of data throughput to transmit power. Resorting to a game-theoretic formulation, a non-cooperative game for utility maximization is formulated, and it is proved that a unique Nash equilibrium exists, which, under certain conditions, is also Pareto-optimal. Theoretical results concerning the relationship between the problems of SINR maximization and MSE minimization are given, and, resorting to the tools of large system analysis, a new distributed power control algorithm is implemented, based on very little prior information about the user of interest. The utility profile achieved by the active users in a large CDMA system is also computed, and, moreover, the centralized socially optimum solution is analyzed. Considerations on the extension of the proposed framework to a multi-cell scenario are also briefly detailed. Simulation results confirm that the proposed non-cooperative game largely outperforms competing alternatives, and that it exhibits a quite small performance loss with respect to the socially optimum solution, and only in the case in which the users number exceeds the processing gain. Finally, results also show an excellent agreement between the theoretical closed-form formulas based on large system analysis and the outcome of numerical experiments.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 17:26:24 GMT" } ]
2007-12-11T00:00:00
[ [ "Buzzi", "Stefano", "" ], [ "Poor", "H. Vincent", "" ] ]
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712.134
Oleg Kochukhov
M. Sachkov, O. Kochukhov, T. Ryabchikova, F. Leone, S. Bagnulo, W.W. Weiss
Spectroscopic study of pulsations in the atmosphere of roAp star 10 Aql
submitted to Contrib. Astron. Obs. Skalnate Pleso (Proceedings of the CP#Ap Workshop, Vienna, 2007, eds. J. Ziznovsky, J. Zverko, E. Pauntzen, M. Netopil)
Contrib.Astron.Obs.Skalnate Pleso 38:323-328,2008
null
null
astro-ph
null
We present the analysis of spectroscopic time-series observations of the roAp star 10 Aql. Observations were carried out in July 2006 with the UVES and SARG spectrographs simultaneously with the MOST mini-satellite photometry. All these data were analysed for radial velocity (RV) variations. About 150 lines out of the 1000 measured reveal clear pulsation signal. Frequency analysis of the spectroscopic data gives four frequencies. Three highest amplitude frequencies in spectroscopy coincide with the photometric ones. Phase-amplitude diagrams created for the lines of different elements/ions show that atmospheric pulsations may be represented by a superposition of the standing and running wave components, similar to other roAp stars. The highest RV amplitudes, 300-400 m/s, were measured for Ce II, Dy III, Tb III, and two unidentified lines at lambda 5471, 5556 A. We discovered ~0.4 period phase jump in the RV measurements across the Nd III line profiles. It indicates the presence of the pulsation node in stellar atmosphere. The phase jump occurs at nearly the same atmospheric layers for the two main frequencies. There is no rotational modulation in the average spectra for the 6 different nights we analysed.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 14:38:16 GMT" } ]
2010-11-26T00:00:00
[ [ "Sachkov", "M.", "" ], [ "Kochukhov", "O.", "" ], [ "Ryabchikova", "T.", "" ], [ "Leone", "F.", "" ], [ "Bagnulo", "S.", "" ], [ "Weiss", "W. W.", "" ] ]
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712.1341
Lisa L. Everett
Durmus A. Demir, Lisa L. Everett, and Paul Langacker
Dirac Neutrino Masses from Generalized Supersymmetry Breaking
5 pages, 1 figure, references added, note added on effective superpotential mass terms generated upon U(1)' breaking
Phys.Rev.Lett.100:091804, 2008
10.1103/PhysRevLett.100.091804
MADPH-07-1500, IZTECH-P-07/05, DESY-07-213
hep-ph hep-th
null
We demonstrate that Dirac neutrino masses in the experimentally preferred range are generated within supersymmetric gauge extensions of the Standard Model with a generalized supersymmetry breaking sector. If the usual superpotential Yukawa couplings are forbidden by the additional gauge symmetry (such as a U(1)'), effective Dirac mass terms involving the "wrong Higgs" field can arise either at tree level due to hard supersymmetry breaking fermion Yukawa couplings, or at one-loop due to nonanalytic or "nonholomorphic" soft supersymmetry breaking trilinear scalar couplings. As both of these operators are naturally suppressed in generic models of supersymmetry breaking, the resulting neutrino masses are naturally in the sub-eV range. The neutrino magnetic and electric dipole moments resulting from the radiative mechanism also vanish at one-loop order.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 15:06:44 GMT" }, { "version": "v2", "created": "Wed, 19 Dec 2007 22:47:16 GMT" } ]
2011-01-28T00:00:00
[ [ "Demir", "Durmus A.", "" ], [ "Everett", "Lisa L.", "" ], [ "Langacker", "Paul", "" ] ]
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712.1342
Heng Lian
Heng Lian
Stochastic adaptation of importance sampler
11 pages, minor changes
null
null
null
stat.ME
null
Improving efficiency of importance sampler is at the center of research in Monte Carlo methods. While adaptive approach is usually difficult within the Markov Chain Monte Carlo framework, the counterpart in importance sampling can be justified and validated easily. We propose an iterative adaptation method for learning the proposal distribution of an importance sampler based on stochastic approximation. The stochastic approximation method can recruit general iterative optimization techniques like the minorization-maximization algorithm. The effectiveness of the approach in optimizing the Kullback divergence between the proposal distribution and the target is demonstrated using several simple examples.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 05:24:26 GMT" } ]
2007-12-11T00:00:00
[ [ "Lian", "Heng", "" ] ]
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712.1343
Giorgio Fabbri
A. Brace, G. Fabbri, B. Goldys
An Hilbert space approach for a class of arbitrage free implied volatilities models
21 pages
null
null
null
q-fin.CP math.PR
null
We present an Hilbert space formulation for a set of implied volatility models introduced in \cite{BraceGoldys01} in which the authors studied conditions for a family of European call options, varying the maturing time and the strike price $T$ an $K$, to be arbitrage free. The arbitrage free conditions give a system of stochastic PDEs for the evolution of the implied volatility surface ${\hat\sigma}_t(T,K)$. We will focus on the family obtained fixing a strike $K$ and varying $T$. In order to give conditions to prove an existence-and-uniqueness result for the solution of the system it is here expressed in terms of the square root of the forward implied volatility and rewritten in an Hilbert space setting. The existence and the uniqueness for the (arbitrage free) evolution of the forward implied volatility, and then of the the implied volatility, among a class of models, are proved. Specific examples are also given.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 15:36:46 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 10:30:59 GMT" } ]
2008-12-10T00:00:00
[ [ "Brace", "A.", "" ], [ "Fabbri", "G.", "" ], [ "Goldys", "B.", "" ] ]
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712.1344
Adriano Barra Dr.
Adriano Barra
The mean field Ising model trough interpolating techniques
35 pages, no figure
null
10.1007/s10955-008-9567-2
null
cond-mat.dis-nn
null
Aim of this work is not trying to explore a macroscopic behavior of some recent model in statistical mechanics but showing how some recent techniques developed within the framework of spin glasses do work on simpler model, focusing on the method and not on the analyzed system. To fulfil our will the candidate model turns out to be the paradigmatic mean field Ising model. The model is introduced and investigated with the interpolation techniques. We show the existence of the thermodynamic limit, bounds for the free energy density, the explicit expression for the free energy with its suitable expansion via the order parameter, the self-consistency relation, the phase transition, the critical behavior and the self-averaging properties. At the end a bridge to a Parisi-like theory is tried and discussed.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 16:19:40 GMT" } ]
2009-11-13T00:00:00
[ [ "Barra", "Adriano", "" ] ]
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712.1345
Giorgi Japaridze
Giorgi Japaridze
Sequential operators in computability logic
To appear in "Information and Computation"
Information and Computation 206 (2008), pp. 1443-1475
10.1016/j.ic.2008.10.001
null
cs.LO cs.AI math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computability logic (CL) (see http://www.cis.upenn.edu/~giorgi/cl.html) is a semantical platform and research program for redeveloping logic as a formal theory of computability, as opposed to the formal theory of truth which it has more traditionally been. Formulas in CL stand for (interactive) computational problems, understood as games between a machine and its environment; logical operators represent operations on such entities; and "truth" is understood as existence of an effective solution, i.e., of an algorithmic winning strategy. The formalism of CL is open-ended, and may undergo series of extensions as the study of the subject advances. The main groups of operators on which CL has been focused so far are the parallel, choice, branching, and blind operators. The present paper introduces a new important group of operators, called sequential. The latter come in the form of sequential conjunction and disjunction, sequential quantifiers, and sequential recurrences. As the name may suggest, the algorithmic intuitions associated with this group are those of sequential computations, as opposed to the intuitions of parallel computations associated with the parallel group of operations: playing a sequential combination of games means playing its components in a sequential fashion, one after one. The main technical result of the present paper is a sound and complete axiomatization of the propositional fragment of computability logic whose vocabulary, together with negation, includes all three -- parallel, choice and sequential -- sorts of conjunction and disjunction. An extension of this result to the first-order level is also outlined.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 16:59:35 GMT" }, { "version": "v2", "created": "Wed, 15 Oct 2008 07:44:55 GMT" } ]
2011-04-15T00:00:00
[ [ "Japaridze", "Giorgi", "" ] ]
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712.1346
Emilio Elizalde
Emilio Elizalde
Zeta Function Methods and Quantum Fluctuations
17 pages, Talk given at the Conference ``Quantum Theory and Symmetries - 5'', Valladolid (Spain), July 22 - 28, 2007
J.Phys.A41:304040,2008
10.1088/1751-8113/41/30/304040
null
hep-th gr-qc math-ph math.MP quant-ph
null
A review of some recent advances in zeta function techniques is given, in problems of pure mathematical nature but also as applied to the computation of quantum vacuum fluctuations in different field theories, and specially with a view to cosmological applications.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 16:58:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Elizalde", "Emilio", "" ] ]
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712.1347
Emilio Elizalde
Emilio Elizalde
Dynamical Casimir Effect with Semi-Transparent Mirrors, and Cosmology
11 pages, Talk given in the Workshop ``Quantum Field Theory under the Influence of External Conditions (QFEXT07)'', Leipzig (Germany), September 17 - 21, 2007
J.Phys.A41:164061,2008
10.1088/1751-8113/41/16/164061
null
hep-th astro-ph gr-qc quant-ph
null
After reviewing some essential features of the Casimir effect and, specifically, of its regularization by zeta function and Hadamard methods, we consider the dynamical Casimir effect (or Fulling-Davis theory), where related regularization problems appear, with a view to an experimental verification of this theory. We finish with a discussion of the possible contribution of vacuum fluctuations to dark energy, in a Casimir like fashion, that might involve the dynamical version.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 17:09:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Elizalde", "Emilio", "" ] ]
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712.1348
Patrick Wils
Patrick Wils, Ioannis Rozakis, Stelios Kleidis, Franz-Josef Hambsch, Klaus Bernhard
Photometry of GSC 762-110, a new triple-mode radially pulsating star
Accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361:20078992
null
astro-ph
null
Stars pulsating in three radial modes are very rare; only three examples are known in the Galaxy. These stars are very useful since their periods may be measured very precisely, and this will constrain the global stellar parameters and the models of the star's interior. The purpose of this paper is to present a new example of the class of triple-mode radial pulsators. A search for candidate multi-mode pulsators was carried out in public survey data. Time-series photometry of one of the candidates, GSC 762-110, was performed. GSC 762-110 was found to be a triple-mode radial pulsator, with a fundamental period of 0.1945d and period ratios of 0.7641 and 0.8012. In addition two non-radial modes were found, for which the amplitude has diminished considerably over the last few years.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 17:11:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Wils", "Patrick", "" ], [ "Rozakis", "Ioannis", "" ], [ "Kleidis", "Stelios", "" ], [ "Hambsch", "Franz-Josef", "" ], [ "Bernhard", "Klaus", "" ] ]
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712.1349
Petr Nicolaevich Bibikov
P. N. Bibikov
Low- and high-field induced uniform and staggered magnetizations of a spin ladder with DM term
7 pages
null
null
null
cond-mat.str-el
null
Analytic expressions for uniform and staggered magnetizations of a spin ladder with a staggered Dzyaloshinskii-Moriya interaction along rungs are obtained in the lowest perturbative orders. The obtained formulas describe magnetic behavior in two marginal regions related to low ($h\ll h_c$) and high ($h\gg h_s$) magnetic fields.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 17:13:50 GMT" } ]
2007-12-11T00:00:00
[ [ "Bibikov", "P. N.", "" ] ]
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712.135
Mark Slater
M. Slater, C. Adolphsen, R. Arnold, S. Boogert, G. Boorman, F. Gournaris, M. Hildreth, C. Hlaing, F. Jackson, O. Khainovski, Yu. G. Kolomensky, A. Lyapin, B. Maiheu, D. McCormick, D. J. Miller, T. J. Orimoto, Z. Szalata, M. Thomson, D. Ward, M. Wing, M. Woods
Cavity BPM System Tests for the ILC Spectrometer
Paper submitted to Nuclear Instruments and Methods. 35 pages, 23 figures
null
10.1016/j.nima.2008.04.033
null
physics.ins-det
null
The main physics programme of the International Linear Collider (ILC) requires a measurement of the beam energy at the interaction point with an accuracy of $10^{-4}$ or better. To achieve this goal a magnetic spectrometer using high resolution beam position monitors (BPMs) has been proposed. This paper reports on the cavity BPM system that was deployed to test this proposal. We demonstrate sub-micron resolution and micron level stability over 20 hours for a $1\m$ long BPM triplet. We find micron-level stability over 1 hour for 3 BPM stations distributed over a $30\m$ long baseline. The understanding of the behaviour and response of the BPMs gained from this work has allowed full spectrometer tests to be carried out.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 17:50:13 GMT" } ]
2009-11-13T00:00:00
[ [ "Slater", "M.", "" ], [ "Adolphsen", "C.", "" ], [ "Arnold", "R.", "" ], [ "Boogert", "S.", "" ], [ "Boorman", "G.", "" ], [ "Gournaris", "F.", "" ], [ "Hildreth", "M.", "" ], [ "Hlaing", "C.", "" ], [ "Jackson", "F.", "" ], [ "Khainovski", "O.", "" ], [ "Kolomensky", "Yu. G.", "" ], [ "Lyapin", "A.", "" ], [ "Maiheu", "B.", "" ], [ "McCormick", "D.", "" ], [ "Miller", "D. J.", "" ], [ "Orimoto", "T. J.", "" ], [ "Szalata", "Z.", "" ], [ "Thomson", "M.", "" ], [ "Ward", "D.", "" ], [ "Wing", "M.", "" ], [ "Woods", "M.", "" ] ]
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712.1351
V\'ictor M. Egu\'iluz
V\'ictor M. Egu\'iluz (1), Mart\'in G. Zimmermann (2), Camilo J. Cela-Conde (3), Maxi San Miguel (1) ((1) IMEDEA (CSIC-UIB), Spain, (2) Universidad de Buenos Aires, Argentina, (3) Universidad de las Islas Baleares, Spain)
Cooperation and the Emergence of Role Differentiation in the Dynamics of Social Networks
(15 pages, 7 figures)
American Journal of Sociology 110, 977-1008 (2005)
10.1086/428716
null
physics.soc-ph
null
By means of extensive computer simulations, the authors consider the entangled coevolution of actions and social structure in a new version of a spatial Prisoner's Dilemma model that naturally gives way to a process of social differentiation. Diverse social roles emerge from the dynamics of the system: leaders are individuals getting a large payoff who are imitated by a considerable fraction of the population, conformists are unsatisfied cooperative agents that keep cooperating, and exploiters are defectors with a payoff larger than the average one obtained by cooperators. The dynamics generate a social network that can have the topology of a small world network. The network has a strong hierarchical structure in which the leaders play an essential role in sustaining a highly cooperative stable regime. But disruptions affecting leaders produce social crises described as dynamical cascades that propagate through the network.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 19:46:01 GMT" } ]
2011-06-16T00:00:00
[ [ "Eguíluz", "Víctor M.", "" ], [ "Zimmermann", "Martín G.", "" ], [ "Cela-Conde", "Camilo J.", "" ], [ "Miguel", "Maxi San", "" ] ]
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712.1352
Yaroslav Zolotaryuk
Yaroslav Zolotaryuk
Resonant fluxon transmission through impurities
8 figures
null
10.1140/epjb/e2008-00152-7
null
nlin.PS
null
Fluxon transmission through several impurities of different strength and type (i.e., microshorts and microresistors), placed in a long Josephson junction is investigated. Threshold pinning current on the impurities is computed as a function of the distance between them, their amplitudes and the dissipation parameter. It is shown that in the case of consequently placed microshorts or microresistors, the threshold pinning current exhibits a clear minimum as a function of the distance between the impurities. In the case of a microresistor, followed by a microshort, an opposite phenomenon is observed, namely the threshold pinning current exhibits maximum as a function of the distance between the impurities.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 18:19:55 GMT" } ]
2009-11-13T00:00:00
[ [ "Zolotaryuk", "Yaroslav", "" ] ]
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712.1353
Deborah Nancy Aguilera
Deborah N. Aguilera, Jos\'e A. Pons and Juan A. Miralles
The impact of magnetic field on the thermal evolution of neutron stars
4 pages, 3 figures, 1 table. Accepted for publication in APJ Letters
Astrophys.J.673:L167-L170,2008
10.1086/527547
null
astro-ph hep-ph nucl-th
null
The impact of strong magnetic fields B>10e13 G on the thermal evolution of neutron stars is investigated, including crustal heating by magnetic field decay. For this purpose, we perform 2D cooling simulations with anisotropic thermal conductivity considering all relevant neutrino emission processes for realistic neutron stars. The standard cooling models of neutron stars are called into question by showing that the magnetic field has relevant (and in many cases dominant) effects on the thermal evolution. The presence of the magnetic field significantly affects the thermal surface distribution and the cooling history of these objects during both, the early neutrino cooling era and the late photon cooling era. The minimal cooling scenario is thus more complex than generally assumed. A consistent magneto-thermal evolution of magnetized neutron stars is needed to explain the observations.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 18:40:58 GMT" } ]
2010-11-11T00:00:00
[ [ "Aguilera", "Deborah N.", "" ], [ "Pons", "José A.", "" ], [ "Miralles", "Juan A.", "" ] ]
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712.1354
Holger Fehske
H. Fehske, G. Wellein, J. Loos, and A. R. Bishop
Localized polarons and doorway vibrons in finite quantum structures
corrected Figs 5 and 6, updated references
Physical Review B 77, 085117 (2008)
10.1103/PhysRevB.77.085117
null
cond-mat.str-el
null
We consider transport through finite quantum systems such as quantum barriers, wells, dots or junctions, coupled to local vibrational modes in the quantal regime. As a generic model we study the Holstein-Hubbard Hamiltonian with site-dependent potentials and interactions. Depending on the barrier height to electron-phonon coupling strength ratio and the phonon frequency we find distinct opposed behaviors: Vibration-mediated tunneling or intrinsic localization of (bi)polarons. These regimes are strongly manifested in the density correlations, mobility, and optical response calculated by exact numerical techniques.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 18:37:15 GMT" }, { "version": "v2", "created": "Sat, 23 Feb 2008 17:01:21 GMT" } ]
2009-11-13T00:00:00
[ [ "Fehske", "H.", "" ], [ "Wellein", "G.", "" ], [ "Loos", "J.", "" ], [ "Bishop", "A. R.", "" ] ]
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712.1355
Michael Dine
Michael Dine and John Mason
Dynamical Supersymmetry Breaking and Low Energy Gauge Mediation
20 pages (minor change in referencing)
Phys.Rev.D78:055013,2008
10.1103/PhysRevD.78.055013
SCIPP-07/18
hep-ph
null
Dynamical breaking of supersymmetry was long thought to be an exceptional phenomenon, but recent developments have altered this view. A question of great interest in the current framework is the value of the underlying scale of supersymmetry breaking. The "little hierarchy" problem suggests that supersymmetry should be broken at low energies. Within one class of models, low energy breaking be achieved as a consequence of symmetries, without requiring odd coincidences. The low energy theories are distinguished by the presence or absence of $R$ symmetries; in either case, and especially the latter one often finds modifications of the minimal gauge-mediated spectrum which can further ameliorate problems of fine tuning. Various natural mechanisms exist to solve the $\mu$ problem in this framework.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 19:28:13 GMT" }, { "version": "v2", "created": "Tue, 11 Dec 2007 19:17:26 GMT" } ]
2009-01-09T00:00:00
[ [ "Dine", "Michael", "" ], [ "Mason", "John", "" ] ]
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712.1356
Ilian Iliev
Ilian T. Iliev (1), Garrelt Mellema (2), Ue-Li Pen (3), Paul R. Shapiro (4) ((1) ITP, University of Zurich, (2) Stockholm University, (3) CITA, University of Toronto, (4) University of Texas)
Character and detectability of the dark ages and the epoch of reionization: the view from the simulations
5 pages, 5 figures (most in color). In Proceedings of "From planets to dark energy: the modern radio universe", October 1-5 2007, University of Manchester, Manchester, UK. To appear in Proceedings of Science online journal
PoSMRU:01118,2007
null
null
astro-ph
null
Direct detection of the Dark Ages and the Epoch of Reionization (EOR) is among the main scientific objectives of all current and future low-frequency radio facilities. In this paper we summarize and discuss recent results, based on state-of-the-art numerical simulations, regarding the fundamental EOR properties and its observability with current and future radio arrays, like the Giant Metrewave Radio Telescope (GMRT), the Low Frequency Array (LOFAR), the 21-CM Array (21CMA), the Murchison Widefield Array (MWA) and the Square Kilometre Array (SKA). Results show that the optimal observational frequencies for statistical detection are 140-160 MHz. The signals are strongly non-Gaussian at late times. The correlation widths between 21-cm maps at neighbouring frequencies are short, of order 300-800 kHz, which should help with the cleaning of the strong foregrounds. Direct comparison of the resolutions and expected sensitivities of GMRT and MWA indicate that their optimal sensitivity ranges are similar, at scales k~0.2-0.4 h/Mpc, however, all else being equal the former should require shorter integration times due to its significantly larger collecting area.
[ { "version": "v1", "created": "Mon, 10 Dec 2007 20:51:39 GMT" } ]
2008-11-26T00:00:00
[ [ "Iliev", "Ilian T.", "" ], [ "Mellema", "Garrelt", "" ], [ "Pen", "Ue-Li", "" ], [ "Shapiro", "Paul R.", "" ] ]
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712.1357
Shelly Garion
Shelly Garion
Connectivity of the Product Replacement Algorithm Graph of PSL(2,q)
12 pages. This article was submitted to the Journal of Group Theory on July 2007 and accepted on December 2007
J. Group Theory 11 (2008), 765-777
10.1515/JGT.2008.048
null
math.GR
null
The product replacement algorithm is a practical algorithm to construct random elements of a finite group G. It can be described as a random walk on a graph whose vertices are the generating k-tuples of G (for a fixed k). We show that if G is PSL(2,q) or PGL(2,q), where q is a prime power, then this graph is connected for any k>=4. This generalizes former results obtained by Gilman and Evans.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 19:41:14 GMT" }, { "version": "v2", "created": "Sun, 30 Dec 2007 18:36:16 GMT" } ]
2010-03-17T00:00:00
[ [ "Garion", "Shelly", "" ] ]
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712.1358
Mariusz Dabrowski P.
Mariusz P. Dabrowski and Janusz Garecki
Energy, angular momentum, superenergy and angular supermomentum in conformal frames
REVTEX 4, 21 pages, no figures, minor changes, references added
null
null
null
hep-th astro-ph gr-qc
null
We find the rules of the conformal transformation for the energetic quantities such as the Einstein energy-momentum complex, the Bergmann-Thomson angular momentum complex, the superenergy tensor, and the angular supermomentum tensor of gravitation and matter. We show that the conformal transformation rules for the matter parts of both the Einstein complex and the Bergmann-Thomson complex are fairly simple, while the transformation rules for their gravitational parts are more complicated. We also find that the transformational rules of the superenergy tensor of matter and the superenergy tensor of gravity are quite complicated except for the case of a pure gravity. In such a special case the superenergy density as well as the sum of the superenergy density and the matter energy density are invariants of the conformal transformation. Besides, in that case, a conformal invariant is also the Bel-Robinson tensor which is a part of the superenergy tensor. As for the angular supermomentum tensor of gravity - it emerges that its transformational rule even for a pure gravity is quite complicated but this is not the case for the angular supermomentum tensor of matter. Having investigated some technicalities of the conformal transformations, we also find the conformal transformation rule for the curvature invariants and, in particular, for the Gauss-Bonnet invariant in a spacetime of arbitrary dimension.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 19:43:26 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 20:02:34 GMT" } ]
2011-11-10T00:00:00
[ [ "Dabrowski", "Mariusz P.", "" ], [ "Garecki", "Janusz", "" ] ]
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712.1359
Olivier Finkel
Olivier Finkel (ELM)
Borel Ranks and Wadge Degrees of Context Free Omega Languages
null
Mathematical Structures in Computer Science 16 (5) (2006) 813-840
null
null
cs.LO cs.GT math.LO
null
We show that, from a topological point of view, considering the Borel and the Wadge hierarchies, 1-counter B\"uchi automata have the same accepting power than Turing machines equipped with a B\"uchi acceptance condition. In particular, for every non null recursive ordinal alpha, there exist some Sigma^0_alpha-complete and some Pi^0_alpha-complete omega context free languages accepted by 1-counter B\"uchi automata, and the supremum of the set of Borel ranks of context free omega languages is the ordinal gamma^1_2 which is strictly greater than the first non recursive ordinal. This very surprising result gives answers to questions of H. Lescow and W. Thomas [Logical Specifications of Infinite Computations, In:"A Decade of Concurrency", LNCS 803, Springer, 1994, p. 583-621].
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:01:02 GMT" } ]
2007-12-11T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ] ]
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712.136
Deanna Needell
Deanna Needell and Roman Vershynin
Signal Recovery from Incomplete and Inaccurate Measurements via Regularized Orthogonal Matching Pursuit
null
null
null
null
math.NA
null
We demonstrate a simple greedy algorithm that can reliably recover a d-dimensional vector v from incomplete and inaccurate measurements x. Here our measurement matrix is an N by d matrix with N much smaller than d. Our algorithm, Regularized Orthogonal Matching Pursuit (ROMP), seeks to close the gap between two major approaches to sparse recovery. It combines the speed and ease of implementation of the greedy methods with the strong guarantees of the convex programming methods. For any measurement matrix that satisfies a Uniform Uncertainty Principle, ROMP recovers a signal with O(n) nonzeros from its inaccurate measurements x in at most n iterations, where each iteration amounts to solving a Least Squares Problem. The noise level of the recovery is proportional to the norm of the error, up to a log factor. In particular, if the error vanishes the reconstruction is exact. This stability result extends naturally to the very accurate recovery of approximately sparse signals.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:05:19 GMT" } ]
2007-12-11T00:00:00
[ [ "Needell", "Deanna", "" ], [ "Vershynin", "Roman", "" ] ]
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712.1361
Heng-Yu Chen HYC
Heng-Yu Chen, Diego H. Correa
Comments on the Boundary Scattering Phase
14 pages, 2 figures; v2: affiliation corrected
JHEP0802:028,2008
10.1088/1126-6708/2008/02/028
DAMTP-07-114, MAD-TH-07-12
hep-th
null
We present a simple solution to the crossing equation for an open string worldsheet reflection matrix, with boundaries preserving a SU(1|2)^2 residual symmetry, which constrains the boundary dressing factor. In addition, we also propose an analogous crossing equation for the dressing factor where extra boundary degrees of freedom preserve a SU(2|2)^2 residual symmetry.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:16:37 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 10:07:01 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Heng-Yu", "" ], [ "Correa", "Diego H.", "" ] ]
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712.1362
Stuart Parkin
Hyunsoo Yang, See-Hun Yang and Stuart Parkin
Crossover from Kondo assisted suppression to co-tunneling enhancement of tunneling magnetoresistance via ferromagnetic nanodots in MgO tunnel barriers
Nano Letters (in press)
null
10.1021/nl072930n
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
Recently, it has been shown that magnetic tunnel junctions with thin MgO tunnel barriers exhibit extraordinarily high tunneling magnetoresistance (TMR) values at room temperature1, 2. However, the physics of spin dependent tunneling through MgO barriers is only beginning to be unravelled. Using planar magnetic tunnel junctions in which ultra-thin layers of magnetic metals are deposited in the middle of a MgO tunnel barrier here we demonstrate that the TMR is strongly modified when these layers are discontinuous and composed of small pancake shaped nanodots. At low temperatures, in the Coulomb blockade regime, for layers less than ~1 nm thick, the conductance of the junction is increased at low bias consistent with Kondo assisted tunneling. In the same regime we observe a suppression of the TMR. For slightly thicker layers, and correspondingly larger nanodots, the TMR is enhanced at low bias, consistent with co-tunneling.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:11:29 GMT" } ]
2015-05-13T00:00:00
[ [ "Yang", "Hyunsoo", "" ], [ "Yang", "See-Hun", "" ], [ "Parkin", "Stuart", "" ] ]
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712.1363
Olivier Finkel
Olivier Finkel (ELM)
Undecidable Problems About Timed Automata
null
Dans Proceedings of the 4th International Conference on Formal Modelling and Analysis of Timed Systems - FORMATS'06, France (2006)
null
null
cs.LO cs.CC math.LO
null
We solve some decision problems for timed automata which were recently raised by S. Tripakis in [ Folk Theorems on the Determinization and Minimization of Timed Automata, in the Proceedings of the International Workshop FORMATS'2003, LNCS, Volume 2791, p. 182-188, 2004 ] and by E. Asarin in [ Challenges in Timed Languages, From Applied Theory to Basic Theory, Bulletin of the EATCS, Volume 83, p. 106-120, 2004 ]. In particular, we show that one cannot decide whether a given timed automaton is determinizable or whether the complement of a timed regular language is timed regular. We show that the problem of the minimization of the number of clocks of a timed automaton is undecidable. It is also undecidable whether the shuffle of two timed regular languages is timed regular. We show that in the case of timed B\"uchi automata accepting infinite timed words some of these problems are Pi^1_1-hard, hence highly undecidable (located beyond the arithmetical hierarchy).
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:11:42 GMT" } ]
2007-12-11T00:00:00
[ [ "Finkel", "Olivier", "", "ELM" ] ]
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712.1364
Stefano Gandolfi
Stefano Gandolfi
The Auxiliary Field Diffusion Monte Carlo Method for Nuclear Physics and Nuclear Astrophysics
Ph.D. thesis at University of Trento, Italy. 121 pages
null
null
null
nucl-th astro-ph cond-mat.other
null
In this thesis, I discuss the use of the Auxiliary Field Diffusion Monte Carlo method to compute the ground state of nuclear Hamiltonians, and I show several applications to interesting problems both in nuclear physics and in nuclear astrophysics. In particular, the AFDMC algorithm is applied to the study of several nuclear systems, finite, and infinite matter. Results about the ground state of nuclei ($^4$He, $^8$He, $^{16}$O and $^{40}$Ca), neutron drops (with 8 and 20 neutrons) and neutron rich-nuclei (isotopes of oxygen and calcium) are discussed, and the equation of state of nuclear and neutron matter are calculated and compared with other many-body calculations. The $^1S_0$ superfluid phase of neutron matter in the low-density regime was also studied.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:40:06 GMT" } ]
2007-12-11T00:00:00
[ [ "Gandolfi", "Stefano", "" ] ]
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712.1365
Alexei Vazquez
Alexei Vazquez
Population stratification using a statistical model on hypergraphs
7 pages, 6 figures
Phys. Rev. E 77, 066106 (2008)
10.1103/PhysRevE.77.066106
null
q-bio.PE cs.AI physics.data-an
null
Population stratification is a problem encountered in several areas of biology and public health. We tackle this problem by mapping a population and its elements attributes into a hypergraph, a natural extension of the concept of graph or network to encode associations among any number of elements. On this hypergraph, we construct a statistical model reflecting our intuition about how the elements attributes can emerge from a postulated population structure. Finally, we introduce the concept of stratification representativeness as a mean to identify the simplest stratification already containing most of the information about the population structure. We demonstrate the power of this framework stratifying an animal and a human population based on phenotypic and genotypic properties, respectively.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 20:53:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Vazquez", "Alexei", "" ] ]
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712.1366
Erwin Mi\~na-D\'iaz
Erwin Mi\~na-D\'iaz
An expansion for polynomials orthogonal over an analytic Jordan curve
15 pages, 1 figure
Communications in Mathematical Physics. Vol. 285, 3:1109-1128 (2009)
10.1007/s00220-008-0541-2
null
math.CA math.CV
null
We consider polynomials that are orthogonal over an analytic Jordan curve L with respect to a positive analytic weight, and show that each such polynomial of sufficiently large degree can be expanded in a series of certain integral transforms that converges uniformly in the whole complex plane. This expansion yields, in particular and simultaneously, Szego's classical strong asymptotic formula and a new integral representation for the polynomials inside L. We further exploit such a representation to derive finer asymptotic results for weights having finitely many singularities (all of algebraic type) on a thin neighborhood of the orthogonality curve. Our results are a generalization of those previously obtained in [7] for the case of L being the unit circle.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 21:02:03 GMT" } ]
2009-03-19T00:00:00
[ [ "Miña-Díaz", "Erwin", "" ] ]
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712.1367
Anatoly Svidzinsky
Daniel M. Greenberger, Noam Erez, Marlan O. Scully, Anatoly A. Svidzinsky, M. Suhail Zubairy
Planck, Photon Statistics, and Bose-Einstein Condensation
Review paper, 58 pages, 10 figures
Progress in Optics, vol. 50, edited by E. Wolf, Elsevier, Amsterdam, 275-330 (2007)
null
null
physics.optics physics.hist-ph
null
The interplay between optical and statistical physics is a rich and exciting field of study. Black body radiation was the first application of photon statistics, although it was initially treated as a problem of the cavity oscillators in equilibrium with the photon field. However Planck surprisingly resisted the idea that anything physical would be quantized for a long time after he had solved the problem. We trace this development. Then, after the invention of the laser itself, it proved difficult to develop a theory of laser action that could account for photon statistics, i.e. fluctuations near threshold. This was accomplished in 1965. After Bose-Einstein condensation was successfully achieved, the same problem arose in this case. The fluctuation problem had not been treated adequately even for the ideal Bose gas. However this problem has now been solved using the same techniques as in the theory of laser action.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 21:08:45 GMT" } ]
2007-12-11T00:00:00
[ [ "Greenberger", "Daniel M.", "" ], [ "Erez", "Noam", "" ], [ "Scully", "Marlan O.", "" ], [ "Svidzinsky", "Anatoly A.", "" ], [ "Zubairy", "M. Suhail", "" ] ]
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712.1368
Benoit Mosser
B. Mosser, F. Bouchy, M. Martic, et al
Asteroseismology of Procyon with SOPHIE
7 pages, 7 figures
null
10.1051/0004-6361:20078337
null
astro-ph
null
This paper reports a 9-night asteroseismic observation program conducted in January 2007 with the new spectrometer Sophie at the OHP 193-cm telescope, on the F5 IV-V target Procyon A. This first asteroseismic program with Sophie was intended to test the performance of the instrument with a bright but demanding asteroseismic target and was part of a multisite network. The Sophie spectra have been reduced with the data reduction software provided by OHP. The Procyon asteroseismic data were then analyzed with statistical tools. The asymptotic analysis has been conducted considering possible curvature in the echelle diagram analysis. These observations have proven the efficient performance of Sophie used as an asteroseismometer, and succeed in a clear detection of the large spacing. An \'echelle diagram based on the 54-$\mu$Hz spacing shows clear ridges. Identification of the peaks exhibits large spacings varying from about 52 $\mu$Hz to 56 $\mu$Hz.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 21:16:30 GMT" } ]
2009-11-13T00:00:00
[ [ "Mosser", "B.", "" ], [ "Bouchy", "F.", "" ], [ "Martic", "M.", "" ] ]
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712.1369
Ivan Rungger
Ivan Rungger and Stefano Sanvito (School of Physics and CRANN, Trinity College, Dublin, Ireland)
Accurate self-energy algorithm for quasi-1D systems
null
null
null
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
We present a complete prescription for the numerical calculation of surface Green's functions and self-energies of semi-infinite quasi-onedimensional systems. Our work extends the results of Sanvito et al. [1] generating a robust algorithm to be used in conjunction with ab initio electronic structure methods. We perform a detailed error analysis of the scheme and find that the highest accuracy is found if no inversion of the usually ill conditioned hopping matrix is involved. Even in this case however a transformation of the hopping matrix that decreases its condition number is needed in order to limit the size of the imaginary part of the wave-vectors. This is done in two different ways, either by applying a singular value decomposition and setting a lowest bound for the smallest singular value, or by adding a random matrix of small amplitude. By using the first scheme the size of the Hamiltonian matrix is reduced, making the computation considerably faster for large systems. For most energies the method gives high accuracy, however in the presence of surface states the error diverges due to the singularity in the self-energy. A surface state is found at a particular energy if the set of solution eigenvectors of the infinite system is linearly dependent. This is then used as a criterion to detect surface states, and the error is limited by adding a small imaginary part to the energy. [1] S. Sanvito, C. J. Lambert, J. H. Jefferson, and A. M. Bratkovsky, Phys. Rev. B 59, 11936 (1999).
[ { "version": "v1", "created": "Sun, 9 Dec 2007 21:43:13 GMT" } ]
2007-12-11T00:00:00
[ [ "Rungger", "Ivan", "", "School of Physics and CRANN, Trinity\n College, Dublin, Ireland" ], [ "Sanvito", "Stefano", "", "School of Physics and CRANN, Trinity\n College, Dublin, Ireland" ] ]
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712.137
Caroline Soubiran
C. Soubiran (1), O. Bienayme (2), T.V. Mishenina (3), V.V. Kovtyukh (3) ((1) Laboratoire d'Astrophysique de Bordeaux, (2) Observatoire de Strasbourg, (3) Odessa Observatory)
Vertical distribution of Galactic disk stars IV - AMR and AVR from clump giants
13 pages, 14 figures, accepted in A&A
null
10.1051/0004-6361:20078788
null
astro-ph
null
We present the parameters of 891 stars, mostly clump giants, including atmospheric parameters, distances, absolute magnitudes, spatial velocities, galactic orbits and ages. One part of this sample consists of local giants, within 100 pc, with atmospheric parameters either estimated from our spectroscopic observations at high resolution and high signal-to-noise ratio, or retrieved from the literature. The other part of the sample includes 523 distant stars, which we have estimated atmospheric parameters from high resolution but low signal-to-noise Echelle spectra. This new sample is kinematically unbiased, with well-defined boundaries in magnitude and colours. We revisit the basic properties of the Galactic thin disk as traced by clump giants. We find the metallicity distribution to be different from that of dwarfs, with less metal-rich stars. We find evidence for a vertical metallicity gradient of -0.31 dex/kpc and for a transition at 4-5 Gyr in both the metallicity and velocities. The age - metallicity relation (AMR), which exhibits a very low dispersion, increases smoothly from 10 to 4 Gyr, with a steeper increase for younger stars. The age-velocity relation (AVR) is characterized by the saturation of the V and W dispersions at 5 Gyr, and continuous heating in U.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 21:36:08 GMT" } ]
2009-11-13T00:00:00
[ [ "Soubiran", "C.", "" ], [ "Bienayme", "O.", "" ], [ "Mishenina", "T. V.", "" ], [ "Kovtyukh", "V. V.", "" ] ]
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712.1371
Constantin Loizides
Constantin Loizides (for the PHOBOS collaboration)
Recent Results from PHOBOS
6 pages, 4 figures, talk given at SQM 2007
J.Phys.G35:044006,2008
10.1088/0954-3899/35/4/044006
null
nucl-ex
null
In this manuscript we give a short summary of recent physics results from PHOBOS. Particular emphasis is put on elliptic flow, fluctuations in the initial geometry and the recent measurements of elliptic flow fluctuations.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 21:42:57 GMT" } ]
2019-08-13T00:00:00
[ [ "Loizides", "Constantin", "", "for the PHOBOS collaboration" ] ]
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712.1372
Kshitij Khare
Kshitij Khare
Dynkin's Isomorphism with Sign Structure
null
null
null
null
math.ST stat.TH
null
The Dynkin isomorphism associates a Gaussian field to a Markov chain. These Gaussian fields can be used as priors for prediction and time series analysis. Dynkin's construction gives Gaussian fields with all non-negative covariances. We extend Dynkin's construction (by introducing a sign structure on the Markov chain) to allow general covariance sign patterns.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 21:51:19 GMT" } ]
2007-12-11T00:00:00
[ [ "Khare", "Kshitij", "" ] ]
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712.1373
Andrey Ivanov B.
A.B.Ivanov
Behavior of bounded solutions of quasilinear elliptic equations on Riemannian manifolds
null
null
10.1007/s11503-008-1016-7
null
math.AP
null
This paper deals with bounded solutions of quasilinear elliptic equations on Riemannian manifolds satisfying special condition.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 22:17:04 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 17:18:34 GMT" } ]
2009-11-13T00:00:00
[ [ "Ivanov", "A. B.", "" ] ]
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712.1374
Fr\'ed\'eric Pont
F. Pont, H. Knutson, R. L. Gilliland, C. Moutou, D. Charbonneau
Detection of atmospheric haze on an extrasolar planet: The 0.55 - 1.05 micron transmission spectrum of HD189733b with the Hubble Space Telescope
11 pages, MNRAS, accepted, minor corrections
null
10.1111/j.1365-2966.2008.12852.x
null
astro-ph
null
The nearby transiting planet HD 189733b was observed during three transits with the ACS camera of the Hubble Space Telescope in spectroscopic mode. The resulting time series of 675 spectra covers the 550-1050 nm range, with a resolution element of ~8 nm, at extremely high accuracy (signal-to-noise ratio up to 10,000 in 50 nm intervals in each individual spectrum). Using these data, we disentangle the effects of limb darkening, measurement systematics, and spots on the surface of the host star, to calculate the wavelength dependence of the effective transit radius to an accuracy of ~50 km. This constitutes the ``transmission spectrum'' of the planetary atmosphere. It indicates at each wavelength at what height the planetary atmosphere becomes opaque to the grazing stellar light during the transit. In this wavelength range, strong features due to sodium, potassium and water are predicted by atmosphere models for a planet like HD 189733b, but they can be hidden by broad absorption from clouds or hazes higher up in the atmosphere. We observed an almost featureless transmission spectrum between 550 and 1050 nm, with no indication of the expected sodium or potassium atomic absorption features. Comparison of our results with the transit radius observed in the near and mid-infrared (2-8 microns), and the slope of the spectrum, suggest the presence of a haze of sub-micron particles in the upper atmosphere of the planet.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 22:31:24 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 08:28:48 GMT" } ]
2009-11-13T00:00:00
[ [ "Pont", "F.", "" ], [ "Knutson", "H.", "" ], [ "Gilliland", "R. L.", "" ], [ "Moutou", "C.", "" ], [ "Charbonneau", "D.", "" ] ]
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712.1375
Jason Fulman
Jason Fulman
Commutation relations and Markov chains
37 pages; referee suggestions implemented, discuss up-down chains as well, slightly better bounds in Props. 5.6, 7.6
null
null
null
math.PR math.CO
null
It is shown that the combinatorics of commutation relations is well suited for analyzing the convergence rate of certain Markov chains. Examples studied include random walk on irreducible representations, a local random walk on partitions whose stationary distribution is the Ewens distribution, and some birth-death chains.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 23:17:44 GMT" }, { "version": "v2", "created": "Sun, 20 Jan 2008 22:44:39 GMT" } ]
2008-01-21T00:00:00
[ [ "Fulman", "Jason", "" ] ]
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712.1376
Toshiro Sakakibara
K. Yano, T. Sakakibara, T. Tayama, M. Yokoyama, H. Amitsuka, Y. Homma, P. Miranovic, M. Ichioka, Y. Tsutsumi, and K. Machida
Field-angle-dependent specific heat measurements and gap determination of a heavy fermion superconductor URu2Si2
4 pages, 5 figures, to appear in Phys. Rev. Lett
Phys. Rev. Lett. 100, 017004 (2008)
10.1103/PhysRevLett.100.017004
null
cond-mat.str-el cond-mat.supr-con
null
To identify the superconducting gap structure in URu2Si2 we perform field-angle-dependent specific heat measurements for the two principal orientations in addition to field rotations, and theoretical analysis based on microscopic calculations. The Sommerfeld coefficient \gamma(H)'s in the mixed state exhibit distinctively different field-dependence. This comes from point nodes and substantial Pauli paramagnetic effect of URu2Si2. These two features combined give rise to a consistent picture of superconducting properties, including a possible first order transition of Hc2 at low temperatures.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 23:19:08 GMT" } ]
2010-03-31T00:00:00
[ [ "Yano", "K.", "" ], [ "Sakakibara", "T.", "" ], [ "Tayama", "T.", "" ], [ "Yokoyama", "M.", "" ], [ "Amitsuka", "H.", "" ], [ "Homma", "Y.", "" ], [ "Miranovic", "P.", "" ], [ "Ichioka", "M.", "" ], [ "Tsutsumi", "Y.", "" ], [ "Machida", "K.", "" ] ]
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712.1377
Zhenghan Wang
Eric Rowell, Richard Stong, Zhenghan Wang
On classification of modular tensor categories
Several references added. Minor revisions of the abstract, introduction and Section 2. Error in one R-matrix eigenvalue for (A_1,2) in the published version corrected
Comm. Math. Phys. 292 (2009) no. 2, 343--389
null
null
math.QA cond-mat.mes-hall math.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We classify all unitary modular tensor categories (UMTCs) of rank $\leq 4$. There are a total of 70 UMTCs of rank $\leq 4$ (Note that some authors would have counted as 35 MTCs.) In our convention there are two trivial unitary MTCs distinguished by the modular $S$ matrix $S=(\pm1)$. Each such UMTC can be obtained from 10 non-trivial prime UMTCs by direct product, and some symmetry operations. UMTCs encode topological properties of anyonic quantum systems and can be used to build fault-tolerant quantum computers. We conjecture that there are only finitely many equivalence classes of MTCs for any given rank, and a UMTC is universal for anyonic quantum computation if and only if its global quantum dimension $D^2$ is \emph{not} an integer. Discovery of non-abelain anyons in Nature will be a landmark in condensed matter physics. The non-abelian anyons in UMTCs of rank $\leq 4$ are the simplest, and, therefore, are most likely to be found. G. Moore and N. Read proposed that non-abelian statistics could occur in fractional quantum Hall (FQH) liquids. The Read-Rezayi conjecture predicts the existence of anyons related to $SU(2)_k$ in FQH liquids at filling fractions $\nu=2+\frac{k}{k+2}$ for $k=1,2,3$. For $\nu={5/2}$ and $SU(2)_2$, there is a numerical proof and experimental evidence for this conjecture. The Ising anyons might exist in chiral superconductors (strontium ruthenate). There are theoretical designs for the toric code MTC using Josephson junction array, for the $Fib\times Fib$ MTC using optical lattice, and for the $SU(2)_k$ using cold trapped bosonic atoms.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 23:35:50 GMT" }, { "version": "v2", "created": "Wed, 12 Dec 2007 03:38:54 GMT" }, { "version": "v3", "created": "Mon, 17 Dec 2007 03:22:04 GMT" }, { "version": "v4", "created": "Mon, 9 Nov 2009 18:04:18 GMT" } ]
2009-11-09T00:00:00
[ [ "Rowell", "Eric", "" ], [ "Stong", "Richard", "" ], [ "Wang", "Zhenghan", "" ] ]
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712.1378
Vladislav Kargin
Vladislav Kargin
Lyapunov Exponents of Free Operators
16 pages
Journal of Functional Analysis, 2008, 255, 1874-1888
null
null
math.PR math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lyapunov exponents of a dynamical system are a useful tool to gauge the stability and complexity of the system. This paper offers a definition of Lyapunov exponents for a sequence of free linear operators. The definition is based on the concept of the extended Fuglede-Kadison determinant. We establish the existence of Lyapunov exponents, derive formulas for their calculation, and show that Lyapunov exponents of free variables are additive with respect to operator product. We illustrate these results using an example of free operators whose singular values are distributed by the Marchenko-Pastur law, and relate this example to C. M. Newman's "triangle" law for the distribution of Lyapunov exponents of large random matrices with independent Gaussian entries. As an interesting by-product of our results, we derive a relation between the extended Fuglede-Kadison determinant and Voiculescu's S-transform.
[ { "version": "v1", "created": "Sun, 9 Dec 2007 23:46:25 GMT" }, { "version": "v2", "created": "Fri, 28 Nov 2008 23:15:29 GMT" } ]
2008-11-29T00:00:00
[ [ "Kargin", "Vladislav", "" ] ]
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