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801.0173
Alberto Canonaco
Alberto Canonaco
Exceptional sequences and derived autoequivalences
17 pages
null
null
null
math.AG
null
We prove a general theorem that gives a non trivial relation in the group of derived autoequivalences of a variety (or stack) X, under the assumption that there exists a suitable functor from the derived category of another variety Y admitting a full exceptional sequence. Applications include the case in which X is Calabi-Yau and either X is a hypersurface in Y (this extends a previous result by the author and R.L. Karp, where Y was a weighted projective space) or Y is a hypersurface in X. The proof uses a resolution of the diagonal of Y constructed from the exceptional sequence.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 00:52:02 GMT" } ]
2008-01-03T00:00:00
[ [ "Canonaco", "Alberto", "" ] ]
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801.0174
Luc Menichi
David Chataur, Luc Menichi
String topology of classifying spaces
53 pages. Section 3 on Props and fields theories rewritten. Section 4 expanded in new sections 4, 5, 6 and 7, to fix orientation problems, finite groups case detailed in section 7. Appendix on signs added. The rest of the sections almost unchanged. Some slight improvements on some results. For example, the BV-algebra is valid over any principal ideal domain
null
null
null
math.AT math.QA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $G$ be a finite group or a compact connected Lie group and let $BG$ be its classifying space. Let $\mathcal{L}BG:=map(S^1,BG)$ be the free loop space of $BG$ i.e. the space of continuous maps from the circle $S^1$ to $BG$. The purpose of this paper is to study the singular homology $H_*(\mathcal LBG)$ of this loop space. We prove that when taken with coefficients in a field the homology of $\mathcal LBG$ is a homological conformal field theory. As a byproduct of our main theorem, we get a Batalin-Vilkovisky algebra structure on the cohomology $H^*(\mathcal LBG)$. We also prove an algebraic version of this result by showing that the Hochschild cohomology $HH^*(S_* (G),S_*(G))$ of the singular chains of $G$ is a Batalin-Vilkovisky algebra.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 00:52:10 GMT" }, { "version": "v2", "created": "Wed, 27 Feb 2008 23:12:11 GMT" }, { "version": "v3", "created": "Mon, 1 Jun 2009 14:48:15 GMT" } ]
2009-06-01T00:00:00
[ [ "Chataur", "David", "" ], [ "Menichi", "Luc", "" ] ]
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801.0175
Scott Wolpert
Scott A. Wolpert
The Weil-Petersson metric geometry
null
null
null
null
math.DG
null
A summary introduction of the Weil-Petersson metric space geometry is presented. Teichmueller space and its augmentation are described in terms of Fenchel-Nielsen coordinates. Formulas for the gradients and Hessians of geodesic-length functions are presented. Applications are considered. A description of the Weil-Petersson metric in Fenchel-Nielsen coordinates is presented. The Alexandrov tangent cone at points of the augmentation is described. A comparison dictionary is presented between the geometry of the space of flat tori and Teichmueller space with the Weil-Petersson metric.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 01:10:59 GMT" } ]
2008-01-03T00:00:00
[ [ "Wolpert", "Scott A.", "" ] ]
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801.0176
Alexander Gorban
A. N. Gorban, N. R. Sumner and A. Y. Zinovyev
PCA Beyond The Concept of Manifolds: Principal Trees, Metro Maps, and Elastic Cubic Complexes
19 pages, 8 figures
A.N. Gorban, B. Kegl, D.C. Wunsch, A. Zinovyev (eds.) Principal Manifolds for Data Visualization and Dimension Reduction, Lecture Notes in Computational Science and Engineering 58, Springer, Berlin - Heidelberg, 2008, 219-237
10.1007/978-3-540-73750-6_9
null
physics.data-an physics.bio-ph
null
Multidimensional data distributions can have complex topologies and variable local dimensions. To approximate complex data, we propose a new type of low-dimensional ``principal object'': a principal cubic complex. This complex is a generalization of linear and non-linear principal manifolds and includes them as a particular case. To construct such an object, we combine a method of topological grammars with the minimization of an elastic energy defined for its embedment into multidimensional data space. The whole complex is presented as a system of nodes and springs and as a product of one-dimensional continua (represented by graphs), and the grammars describe how these continua transform during the process of optimal complex construction. The simplest case of a topological grammar (``add a node'', ``bisect an edge'') is equivalent to the construction of ``principal trees'', an object useful in many practical applications. We demonstrate how it can be applied to the analysis of bacterial genomes and for visualization of cDNA microarray data using the ``metro map'' representation. The preprint is supplemented by animation: ``How the topological grammar constructs branching principal components (AnimatedBranchingPCA.gif)''.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 01:26:59 GMT" } ]
2008-01-17T00:00:00
[ [ "Gorban", "A. N.", "" ], [ "Sumner", "N. R.", "" ], [ "Zinovyev", "A. Y.", "" ] ]
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801.0177
Taewan Kim
Dong Pyo Chi, Jeong Woon Choi, Jeong San Kim, Taewan Kim, and Soojoon Lee
Three-party d-level quantum secret sharing protocol
4 pages
J. Phys. A: Math. Theor. 41, 255309 (2008).
10.1088/1751-8113/41/25/255309
null
quant-ph
null
We develop a three-party quantum secret sharing protocol based on arbitrary dimensional quantum states. In contrast to the previous quantum secret sharing protocols, the sender can always control the state, just using local operations, for adjusting the correlation of measurement directions of three parties and thus there is no waste of resource due to the discord between the directions. Moreover, our protocol contains the hidden value which enables the sender to leak no information of secret key to the dishonest receiver until the last steps of the procedure.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 01:44:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Chi", "Dong Pyo", "" ], [ "Choi", "Jeong Woon", "" ], [ "Kim", "Jeong San", "" ], [ "Kim", "Taewan", "" ], [ "Lee", "Soojoon", "" ] ]
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801.0178
Ognjen Perisic
Ognjen Perisic and Hui Lu (University of Illinois at Chicago)
Efficient free energy profile reconstruction using adaptive stochastic perturbation protocols
LaTeX (revtex4), 4 pages, 4 Postscript figures
null
null
null
cond-mat.stat-mech
null
Application of Jarzynski nonequilibrium work relation to free energy calculation is limited by the very slow convergence of the estimate when dissipation is high. We present a novel perturbation protocol able to improve the convergence of Jarzynski estimator when it is applied in the reconstruction of the potential of mean force. The improvement is based on the application of the adaptive external work variation in addition to the one caused by thermal fluctuations.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 01:47:55 GMT" } ]
2008-01-03T00:00:00
[ [ "Perisic", "Ognjen", "", "University of Illinois at Chicago" ], [ "Lu", "Hui", "", "University of Illinois at Chicago" ] ]
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801.0179
Yasushi Mino
Yasushi Mino, Richard Price
Two-timescale adiabatic expansion of a scalar field model
null
Phys.Rev.D77:064001,2008
10.1103/PhysRevD.77.064001
null
gr-qc
null
The analysis of gravitational wave data may require greater accuracy than is afforded by the adiabatic approximation to the trajectory of and field produced by a particle moving in curved spacetime. Higher accuracy is available with a two-timescale approach using as an expansion parameter the ratio of orbital time to radiation reaction time. To avoid apparent divergences at large distances, the details of the method are important, especially the choice of the foliation, the spacetime surfaces on which the orbital elements are taken to be constant. Here we apply the two-timescale approach to a simple linear model to demonstrate the details of the method. In particular we use it to show that a null foliation avoids large-distance divergences in the first-order post-adiabatic approximation, and we argue that this will be true more generally for a null foliation.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 03:05:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Mino", "Yasushi", "" ], [ "Price", "Richard", "" ] ]
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801.018
Kai Chang
Jiang-Tao Liu and Kai Chang
Direct optical detection of pure spin current in semiconductors
4 pages, 3 figures
null
10.1103/PhysRevB.78.113304
null
cond-mat.mes-hall cond-mat.other
null
We suggest a new practical scheme for the direct detection of pure spin current by using the two-color Faraday rotation of optical quantum interference process (QUIP) in a semiconductor system. We demonstrate theoretically that the Faraday rotation of QUIP depends sensitively on the spin orientation and wave vector of the carriers, and can be tuned by the relative phase and the polarization direction of the $\omega$ and $2\omega$ laser beams. By adjusting these parameters, the magnitude and direction of the spin current can be detected.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 03:16:02 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Jiang-Tao", "" ], [ "Chang", "Kai", "" ] ]
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801.0181
Morimitsu Tanimoto
Mizue Honda and Morimitsu Tanimoto
Deviation from tri-bimaximal neutrino mixing in A4 flavor symmetry
12 pages, 18 figures, some discussions and references are added
Prog.Theor.Phys.119:583-598,2008
10.1143/PTP.119.583
null
hep-ph
null
The tri-bimaximal mixing is a good approximation for the present data of neutrino mixing angles. The deviation from the tri-bimaximal mixing is discussed numerically in the framework of the A4 model. Values of \tan^2\theta_{12}, \sin^2 2\theta_{23} and |U_{e3}| deviate from the tri-bimaximal mixing due to the corrections of the vacuum alignment of flavon fields. It is remarked that \sin^2 2\theta_{23} deviates scarcely from 1 while \sin^2\theta_{12} can deviate from 1/3 considerably and \sin\theta_{13} could be near the present experimental upper bound. The CP violating measure J_{CP} and the effective Majorana neutrino mass m_{ee} are also discussed.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 03:37:31 GMT" }, { "version": "v2", "created": "Wed, 9 Jan 2008 00:29:04 GMT" } ]
2008-11-26T00:00:00
[ [ "Honda", "Mizue", "" ], [ "Tanimoto", "Morimitsu", "" ] ]
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801.0182
Shunichi Mine
K2K Collaboration: S. Mine, et al
Experimental study of the atmospheric neutrino backgrounds for proton decay to positron and neutral pion searches in water Cherenkov detectors
13 pages, 16 figures
Phys.Rev.D77:032003,2008
10.1103/PhysRevD.77.032003
null
hep-ex
null
The atmospheric neutrino background for proton decay to positron and neutral pion in ring imaging water Cherenkov detectors is studied with an artificial accelerator neutrino beam for the first time. In total, about 314,000 neutrino events corresponding to about 10 megaton-years of atmospheric neutrino interactions were collected by a 1,000 ton water Cherenkov detector (KT). The KT charged-current single neutral pion production data are well reproduced by simulation programs of neutrino and secondary hadronic interactions used in the Super-Kamiokande (SK) proton decay search. The obtained proton to positron and neutral pion background rate by the KT data for SK from the atmospheric neutrinos whose energies are below 3 GeV is about two per megaton-year. This result is also relevant to possible future, megaton-scale water Cherenkov detectors.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 03:38:24 GMT" } ]
2008-11-26T00:00:00
[ [ "K2K Collaboration", "", "" ], [ "Mine", "S.", "" ] ]
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801.0183
Rajesh R. Parwani
Le-Huy Nguyen, Hai-Siong Tan and Rajesh R. Parwani
The large nonlinearity scale limit of an information-theoretically motivated nonlinear Schrodinger equation
Presented at the Quantum Theory and Symmetries-5 conference held at Valladolid, Spain; July 2007. 11pages, inclusive of 3 figures
null
10.1088/1742-6596/128/1/012035
null
quant-ph hep-th nlin.PS
null
A nonlinear Schrodinger equation, that had been obtained within the context of the maximum uncertainty principle, has the form of a difference-differential equation and exhibits some interesting properties. Here we discuss that equation in the regime where the nonlinearity length scale is large compared to the deBroglie wavelength; just as in the perturbative regime, the equation again displays some universality. We also briefly discuss stationary solutions to a naturally induced discretisation of that equation.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 03:46:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Nguyen", "Le-Huy", "" ], [ "Tan", "Hai-Siong", "" ], [ "Parwani", "Rajesh R.", "" ] ]
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801.0184
Ryan Hutchinson
Ryan Hutchinson
The Existence of Strongly-MDS Convolutional Codes
17 pages
null
null
null
math.OC cs.IT math.IT
null
It is known that maximum distance separable and maximum distance profile convolutional codes exist over large enough finite fields of any characteristic for all parameters $(n,k,\delta)$. It has been conjectured that the same is true for convolutional codes that are strongly maximum distance separable. Using methods from linear systems theory, we resolve this conjecture by showing that, over a large enough finite field of any characteristic, codes which are simultaneously maximum distance profile and strongly maximum distance separable exist for all parameters $(n,k,\delta)$.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 04:11:46 GMT" } ]
2008-01-03T00:00:00
[ [ "Hutchinson", "Ryan", "" ] ]
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801.0185
S. Q. Wu
Jun-Jin Peng, Shuang-Qing Wu
Covariant anomalies and Hawking radiation from charged rotating black strings in anti-de Sitter spacetimes
16 pages, 0 figure, 3rd version to be accepted in PLB
Phys.Lett.B661:300-306,2008
10.1016/j.physletb.2008.02.023
null
hep-th gr-qc
null
Motivated by the success of the recently proposed method of anomaly cancellation to derive Hawking fluxes from black hole horizons of spacetimes in various dimensions, we have further extended the covariant anomaly cancellation method shortly simplified by Banerjee and Kulkarni to explore the Hawking radiation of the (3+1)-dimensional charged rotating black strings and their higher dimensional extensions in anti-de Sitter spacetimes, whose horizons are not spherical but can be toroidal, cylindrical or planar, according to their global identifications. It should be emphasized that our analysis presented here is very general in the sense that the determinant of the reduced (1+1)-dimensional effective metric from these black strings need not be equal to one $(\sqrt{-g} \neq 1)$. Our results indicate that the gauge and energy momentum fluxes needed to cancel the (1+1)-dimensional covariant gauge and gravitational anomalies are compatible with the Hawking fluxes. Besides, thermodynamics of these black strings are studied in the case of a variable cosmological constant.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 04:40:59 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 04:45:31 GMT" }, { "version": "v3", "created": "Mon, 11 Feb 2008 02:27:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Peng", "Jun-Jin", "" ], [ "Wu", "Shuang-Qing", "" ] ]
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801.0186
Kazuhiko Minami
Kazuhiko Minami
Fractal structure of a solvable lattice model
14 pages and a figure
null
null
null
cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fractal structure of the six-vertex model is introduced with the use of the IFS (Iterated Function Systems). The fractal dimension satisfies an equation written by the free energy of the six-vertex model. It is pointed out that the transfer matrix method and the $n$-equivalence relation introduced in lattice theories have also been introduced in the area of fractal geometry. All the results can be generalized for the models suitable to the transfer matrix treatment, and hence this gives general relation between solvable lattice models and fractal geometry.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 05:25:45 GMT" }, { "version": "v2", "created": "Sun, 3 May 2009 01:36:03 GMT" } ]
2009-09-29T00:00:00
[ [ "Minami", "Kazuhiko", "" ] ]
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801.0187
Renjun Xu
Renjun Xu, Zhiming Liu, Yanming Ma, Tian Cui, Bingbing Liu, and Guangtian Zou
Ab initio investigation of optical properties of high-pressure phases of ice
30 pages, 10 figures
null
null
null
cond-mat.mtrl-sci
null
We report a detailed ab initio investigation on the optical properties of ice under a wide high pressure range. The ice X phase (up to 380GPa), the theoretical proposed higher pressure phase ice XV (300GPa), as well as the ambient pressure low-temperature phase ice XI are involved. Our results show that the dispersion relations of optical properties of ice under high pressure are quite different from those under ambient pressure. Under higher pressure, there is whole tendency of blue shift in all optical properties of ice, and the energy region for optical response become broader, such as the absorption band and reflection band. In addition to the augmented absorption edge, all absorption peaks are found to be rising, and the reflection peaks are also enhanced a bit; hence the transmissivity of ice is inferred to be dropping. The photoconductivity is enhanced, and we explain this behavior from the increase of earner density. The static optical properties are found to be pressure independent, and principally due to the network topology of hydrogen bonding.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 05:33:17 GMT" } ]
2008-01-03T00:00:00
[ [ "Xu", "Renjun", "" ], [ "Liu", "Zhiming", "" ], [ "Ma", "Yanming", "" ], [ "Cui", "Tian", "" ], [ "Liu", "Bingbing", "" ], [ "Zou", "Guangtian", "" ] ]
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801.0188
Mark Andrews
Mark Andrews
The evolution of free wave packets
6 pages, 4 figures, didactic paper
null
10.1119/1.2982628
null
quant-ph
null
We discuss four general features of force-free evolution: (1) The spatial spread of any packet changes with time in a very simple way. (2) Over sufficiently short periods of time (whose duration is related to the spread in momentum of the packet) the probability distribution moves but there is little change in shape. (3) After a sufficiently long period (related to the initial spatial spread) the packet settles into a simple form simply related to the momentum distribution in the packet. In this asymptotic regime, the shape of the probability distribution no longer changes except for its scale, which increases linearly with the time. (4) There is an infinite denumerable set of simple wave packets (the Hermite-Gauss packets) that do not change shape as they evolve.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 09:31:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Andrews", "Mark", "" ] ]
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801.0189
Xiao-Gang He
Xiao-Gang He (NTU) and Sandip Pakvasa (Hawaii)
Unparticle Induced Baryon Number Violating Nucleon Decays
Latex 10 pages with two figures
Phys.Lett.B662:259-263,2008
10.1016/j.physletb.2008.03.025
null
hep-ph astro-ph hep-ex nucl-ex
null
We study baryon number violating nucleon decays induced by unparticle interactions with the standard model particles. We find that the lowest dimension operators which cause nucleon decays can arise at dimension 6 + (d_s-3/2) with the unparticles being a spinor of dimension d_s=d_\U +1/2. For scalar and vector unparticles of dimension d_\U, the lowest order operatoers arise at 6+d_\U and 7+d_\U dimensions,respectively. Comparing the spinor unparticle induced n \to O^s_\U and experimental bound on invisible decay of a neutron from KamLAND, we find that the scale for unparticle physics is required to be larger than 10^{10} GeV for d_\U < 2 if the couplings are set to be of order one. For scalar and vector unparticles, the dominant baryon number violating decay modes are n\to \bar \nu + O_\U (O^\mu_\U) and p \to e^+ + O_\U (O^\mu_\U). The same experimental bound puts the scales for scalar and vector unparticle to be larger than 10^{7} and 10^{5} GeV for d_\U <2 with couplings set to be of order one. Data on, p \to e^+ invisible, puts similar constraints on unparticle interactions.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 06:10:12 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 00:50:15 GMT" } ]
2008-11-26T00:00:00
[ [ "He", "Xiao-Gang", "", "NTU" ], [ "Pakvasa", "Sandip", "", "Hawaii" ] ]
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801.019
Kenji Ishida
H. Takeya, K. Ishida, K. Kitagawa, Y. Ihara, K. Onuma, Y. Maeno, Y. Nambu, S. Nakatsuji, D. E. MacLaughlin, A. Koda, and R. Kadono
Spin dynamics and spin freezing behavior in the two-dimensional antiferromagnet NiGa$_{2}$S$_{4}$ revealed by Ga-NMR, NQR and $\mu$SR measurements
14 pages, 14 figures. To appear in Phys. Rev. B
null
10.1103/PhysRevB.77.054429
null
cond-mat.str-el
null
We have performed $^{69,71}$Ga nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) and muon spin rotation/resonance on the quasi two-dimensional antiferromagnet (AFM) NiGa$_2$S$_4$, in order to investigate its spin dynamics and magnetic state at low temperatures. Although there exists only one crystallographic site for Ga in NiGa$_2$S$_4$, we found two distinct Ga signals by NMR and NQR. The origin of the two Ga signals is not fully understood, but possibly due to stacking faults along the c axis which induce additional broad Ga NMR and NQR signals with different local symmetries. We found the novel spin freezing occurring at $T_{\rm f}$, at which the specific heat shows a maximum, from a clear divergent behavior of the nuclear spin-lattice relaxation rate $1/T_{1}$ and nuclear spin-spin relaxation rate $1/T_{2}$ measured by Ga-NQR as well as the muon spin relaxation rate $\lambda$. The main sharp NQR peaks exhibit a stronger tendency of divergence, compared with the weak broader spectral peaks, indicating that the spin freezing is intrinsic in NiGa$_2$S$_4$. The behavior of these relaxation rates strongly suggests that the Ni spin fluctuations slow down towards $T_{\rm f}$, and the temperature range of the divergence is anomalously wider than that in a conventional magnetic ordering. A broad structureless spectrum and multi-component $T_1$ were observed below 2 K, indicating that a static magnetic state with incommensurate magnetic correlations or inhomogeneously distributed moments is realized at low temperatures. However, the wide temperature region between 2 K and $T_{\rm f}$, where the NQR signal was not observed, suggests that the Ni spins do not freeze immediately below $T_{\rm f}$, but keep fluctuating down to 2 K with the MHz frequency range.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 06:10:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Takeya", "H.", "" ], [ "Ishida", "K.", "" ], [ "Kitagawa", "K.", "" ], [ "Ihara", "Y.", "" ], [ "Onuma", "K.", "" ], [ "Maeno", "Y.", "" ], [ "Nambu", "Y.", "" ], [ "Nakatsuji", "S.", "" ], [ "MacLaughlin", "D. E.", "" ], [ "Koda", "A.", "" ], [ "Kadono", "R.", "" ] ]
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801.0191
John E. Harper
John E. Harper
Homotopy theory of modules over operads and non-Sigma operads in monoidal model categories
38 pages, uses xy-pic
null
null
null
math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the existence of model category structures on algebras and modules over operads in monoidal model categories.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 06:14:08 GMT" }, { "version": "v2", "created": "Wed, 3 Jun 2009 19:07:34 GMT" } ]
2009-06-03T00:00:00
[ [ "Harper", "John E.", "" ] ]
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801.0192
Refik Inanc Baykur
R. Inanc Baykur
Topology of broken Lefschetz fibrations and near-symplectic 4-manifolds
26 pages, 12 figures. Shorter title and fewer typos
null
null
null
math.GT math.SG
null
The topology of broken Lefschetz fibrations is studied by means of handle decompositions. We consider a slight generalization of round handles, and describe the handle diagrams for all that appear in dimension four. We establish simplified handlebody and monodromy representations for a certain subclass of broken Lefschetz fibrations/pencils, while showing that all near-symplectic closed 4-manifolds can be supported by these a la Auroux, Donaldson, Katzarkov. Various constructions of broken Lefschetz fibrations and a generalization of the symplectic fiber sum operation to the near-symplectic setting are given. Extending the study of Lefschetz fibrations, we detect certain constraints on the symplectic fiber sum operation to result in a 4-manifold with nontrivial Seiberg-Witten invariant, as well as the self-intersection numbers that sections of broken Lefschetz fibrations can acquire.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 06:41:54 GMT" }, { "version": "v2", "created": "Tue, 12 Feb 2008 01:15:31 GMT" } ]
2008-02-12T00:00:00
[ [ "Baykur", "R. Inanc", "" ] ]
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801.0193
John E. Harper
John E. Harper
Homotopy theory of modules over operads in symmetric spectra
Corrigendum
Algebr. Geom. Topol. 9 (2009) 1637-1680
10.2140/agt.2009.9.1637
null
math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish model category structures on algebras and modules over operads in symmetric spectra, and study when a morphism of operads induces a Quillen equivalence between corresponding categories of algebras (resp. modules) over operads.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 06:38:11 GMT" }, { "version": "v2", "created": "Sat, 18 Oct 2008 17:20:27 GMT" }, { "version": "v3", "created": "Thu, 9 Jul 2009 11:47:50 GMT" }, { "version": "v4", "created": "Thu, 15 May 2014 14:13:03 GMT" } ]
2014-10-01T00:00:00
[ [ "Harper", "John E.", "" ] ]
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801.0194
Yi-Hu Yang
Juergen Jost, Yi-Hu Yang, and Kang Zuo
Cohomologies of harmonic bundles on quasi-compact Kaehler manifolds
Will appear in "Proceedings of ICCM, Hangzhou 2007 December 17-22"
null
null
null
math.AG math.DG
null
In this note, we survey our recent work concerning cohomologies of harmonic bundles on quasi-compact Kaehler manifolds.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 08:54:25 GMT" }, { "version": "v2", "created": "Sun, 13 Jan 2008 04:21:30 GMT" } ]
2008-01-13T00:00:00
[ [ "Jost", "Juergen", "" ], [ "Yang", "Yi-Hu", "" ], [ "Zuo", "Kang", "" ] ]
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801.0195
Masahiko Egami
Masahiko Egami, Hideki Iwaki
An optimal life insurance policy in the investment-consumption problem in an incomplete market
This paper has been withdrawn by the authors
null
null
null
q-fin.PM math.OC
null
This paper considers an optimal life insurance for a householder subject to mortality risk. The household receives a wage income continuously, which is terminated by unexpected (premature) loss of earning power or (planned and intended) retirement, whichever happens first. In order to hedge the risk of losing income stream by householder's unpredictable event, the household enters a life insurance contract by paying a premium to an insurance company. The household may also invest their wealth into a financial market. The problem is to determine an optimal insurance/investment/consumption strategy in order to maximize the expected total, discounted utility from consumption and terminal wealth. To reflect a real-life situation better, we consider an incomplete market where the householder cannot trade insurance contracts continuously. To our best knowledge, such a model is new in the insurance and finance literature. The case of exponential utilities is considered in detail to derive an explicit solution. We also provide numerical experiments for that particular case to illustrate our results.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 09:32:32 GMT" }, { "version": "v2", "created": "Mon, 2 May 2011 08:42:36 GMT" } ]
2011-05-03T00:00:00
[ [ "Egami", "Masahiko", "" ], [ "Iwaki", "Hideki", "" ] ]
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801.0196
Svante Janson
Svante Janson
Standard representation of multivariate functions on a general probability space
5 pages
null
null
null
math.PR
null
It is well-known that a random variable, i.e., a function defined on a probability space, with values in a Borel space, can be represented on the special probability space consisting of the unit interval with Lebesgue measure. We show an extension of this to multivariate functions. This is motivated by some recent constructions of random graphs.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 09:23:44 GMT" } ]
2008-01-03T00:00:00
[ [ "Janson", "Svante", "" ] ]
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801.0197
Matthias Neubert
Francesco Giacosa (Uni Frankfurt), Ralf Hofmann (Uni Karlsruhe), and Matthias Neubert (Uni Mainz)
A model for the very early Universe
14 pages, 2 figures; some references added; version to appear in JHEP
JHEP 0802:077,2008
10.1088/1126-6708/2008/02/077
KA-TP-1-2008, MZ-TH/08-1
hep-th hep-ph
null
A model with N species of massless fermions interacting via (microscopic) gravitational torsion in de Sitter spacetime is investigated in the limit N->infinity. The U_V(N)*U_A(N) flavor symmetry is broken dynamically irrespective of the (positive) value of the induced four-fermion coupling. This model is equivalent to a theory with free but massive fermions fluctuating about the chiral condensate. When the fermions are integrated out in a way demonstrated long ago by Candelas and Raine, the associated gap equation together with the Friedmann equation predict that the Hubble parameter vanishes. Introducing a matter sector (subject to a finite gauge symmetry) as a source for subsequent cosmology, the neutral Goldstone field acquires mass by the chiral anomaly, resulting in a Planck-scale axion.
[ { "version": "v1", "created": "Wed, 2 Jan 2008 16:29:52 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 14:39:57 GMT" } ]
2009-12-15T00:00:00
[ [ "Giacosa", "Francesco", "", "Uni Frankfurt" ], [ "Hofmann", "Ralf", "", "Uni Karlsruhe" ], [ "Neubert", "Matthias", "", "Uni Mainz" ] ]
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801.0198
Keijo Kajantie
K. Kajantie, Jorma Louko, T. Tahkokallio
Gravity dual of conformal matter collisions in 1+1 dimensions
19 pages, 5 figures, three references added, text modified accordingly, typos corrected
Phys.Rev.D77:066001,2008
10.1103/PhysRevD.77.066001
HIP-2007-75/TH
hep-th hep-ph
null
We find the three-dimensional gravity dual of a process in which two clouds of (1+1)-dimensional conformal matter moving in opposite directions collide. This gives the most general conformally invariant holographic flow in the 1+1 dimensional boundary theory in terms of two arbitrary functions. With a suitable choice of the arbitrary functions the process can be interpreted as an opaque collision of two extended systems with central, fragmentation and interaction regions. Comparison with classical gluon field calculations relates the size of the system with the saturation scale.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 10:01:52 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 07:09:46 GMT" } ]
2008-12-18T00:00:00
[ [ "Kajantie", "K.", "" ], [ "Louko", "Jorma", "" ], [ "Tahkokallio", "T.", "" ] ]
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801.0199
Dirk Hofmann
Dirk Hofmann and Walter Tholen
Lawvere completion and separation via closure
null
null
null
null
math.CT math.GN
null
For a quantale $\V$, first a closure-theoretic approach to completeness and separation in $\V$-categories is presented. This approach is then generalized to $\Tth$-categories, where $\Tth$ is a topological theory that entails a set monad $\mT$ and a compatible $\mT$-algebra structure on $\V$.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 10:15:04 GMT" } ]
2008-01-03T00:00:00
[ [ "Hofmann", "Dirk", "" ], [ "Tholen", "Walter", "" ] ]
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801.02
Bibhas Majhi Ranjan
Rabin Banerjee and Bibhas Ranjan Majhi
Quantum Tunneling and Back Reaction
LaTex, 6 pages, no figures, minor changes, references added, to appear in Phys. Lett. B
Phys.Lett.B662:62-65,2008
10.1016/j.physletb.2008.02.044
null
hep-th gr-qc
null
We give a correction to the tunneling probability by taking into account the back reaction effect to the metric of the black hole spacetime. We then show how this gives rise to the modifications in the semiclassical black hole entropy and Hawking temperature. Finally, we reproduce the familiar logarithmic correction to the Bekenstein-Hawking area law.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 11:57:47 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 07:38:53 GMT" } ]
2008-12-18T00:00:00
[ [ "Banerjee", "Rabin", "" ], [ "Majhi", "Bibhas Ranjan", "" ] ]
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801.0201
Orfeu Bertolami
Orfeu Bertolami, Francisco Gil Pedro, Morgan Le Delliou
Dark Energy-Dark Matter Interaction from the Abell Cluster A586
Talk presented by O.B. at Encuentros Relativistas Espanoles 2007, Puerto de la Cruz, Tenerife, Spain, 10-14 September 2007. 6 pages, 3 figures and style file
null
10.1051/eas:0830019
null
astro-ph
null
We find that deviation from the virial equilibrium of the Abell Cluster A586 yields evidence of the interaction between dark matter and dark energy. We argue that this interaction might imply a violation of the Equivalence Principle. Our analysis show that evidence is found in the context of two different models of dark energy-dark matter interaction.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 12:23:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Bertolami", "Orfeu", "" ], [ "Pedro", "Francisco Gil", "" ], [ "Delliou", "Morgan Le", "" ] ]
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801.0202
Petteri Kaski
Petteri Kaski, Patric R. J. \"Osterg{\aa}rd
There are 1,132,835,421,602,062,347 nonisomorphic one-factorizations of $K_{14}$
null
null
null
null
math.CO
null
We establish by means of a computer search that a complete graph on 14 vertices has 98,758,655,816,833,727,741,338,583,040 distinct and 1,132,835,421,602,062,347 nonisomorphic one-factorizations. The enumeration is constructive for the 10,305,262,573 isomorphism classes that admit a nontrivial automorphism.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 12:53:10 GMT" } ]
2008-01-03T00:00:00
[ [ "Kaski", "Petteri", "" ], [ "Östergård", "Patric R. J.", "" ] ]
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801.0203
Mario I. Molina
Mario I. Molina and Yuri S. Kivshar
Nonlinear localized modes at phase-slip defects in waveguide arrays
3 pages, 6 figures, submitted to Opt. Lett
Opt. Lett. 33, 917 (2008)
10.1364/OL.33.000917
null
nlin.PS
null
We study light localization at a phase-slip defect created by two semi-infinite mismatched identical arrays of coupled optical waveguides. We demonstrate that the nonlinear defect modes possess the specific properties of both nonlinear surface modes and discrete solitons. We analyze stability of the localized modes and their generation in both linear and nonlinear regimes.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 13:27:17 GMT" } ]
2009-11-13T00:00:00
[ [ "Molina", "Mario I.", "" ], [ "Kivshar", "Yuri S.", "" ] ]
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801.0204
Chikako Yasui
Chikako Yasui, Naoto Kobayashi, Alan T. Tokunaga, Masao Saito, Chihiro Tokoku
Star Formation in the Extreme Outer Galaxy: the IMF in a low metallicity environment
2 pages, 1 figure, To appear in the proceedings of the conference "Formation and Evolution of Galaxy Disks", Rome, Italy, 1-5 October 2007, ASP Conf. Ser., eds. J. G. Funes and E. M. Corsini
null
null
null
astro-ph
null
We are conducting a deep near-infrared (NIR) imaging survey of young embedded clusters in the extreme outer Galaxy (hereafter EOG), at the Galactic radius (R_g) of more than 18 kpc. The EOG is an excellent laboratory to study the nature of the IMF in a low-metallicity environment with a great advantage of the proximity compared to nearby dwarf galaxies, such as LMC & SMC. As a first step, we obtained deep NIR images of Digel Cloud 2 clusters at R_g ~19 kpc using the Subaru 8.2-m telescope. The observed K-band luminosity function shows that IMF in the low metallicity environment down to ~ 0.1 M_{sun} is not significantly different from the typical IMFs in the field and in the nearby star clusters as was suggested in our earlier work.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 13:34:09 GMT" } ]
2008-01-03T00:00:00
[ [ "Yasui", "Chikako", "" ], [ "Kobayashi", "Naoto", "" ], [ "Tokunaga", "Alan T.", "" ], [ "Saito", "Masao", "" ], [ "Tokoku", "Chihiro", "" ] ]
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801.0205
Haijun Zhou
Haijun Zhou
$T \to 0$ mean-field population dynamics approach for the random 3-satisfiability problem
10 pages with 5 figures. Extensively revised. PRE published version
PRE 77 (2008) 066102
10.1103/PhysRevE.77.066102
null
cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
During the past decade, phase-transition phenomena in the random 3-satisfiability (3-SAT) problem has been intensively studied by statistical physics methods. In this work, we study the random 3-SAT problem by the mean-field first-step replica-symmetry-broken cavity theory at the limit of temperature $T\to 0$. The reweighting parameter $y$ of the cavity theory is allowed to approach infinity together with the inverse temperature $\beta$ with fixed ratio $r=y / \beta$. Focusing on the the system's space of satisfiable configurations, we carry out extensive population dynamics simulations using the technique of importance sampling and we obtain the entropy density $s(r)$ and complexity $\Sigma(r)$ of zero-energy clusters at different $r$ values. We demonstrate that the population dynamics may reach different fixed points with different types of initial conditions. By knowing the trends of $s(r)$ and $\Sigma(r)$ with $r$, we can judge whether a certain type of initial condition is appropriate at a given $r$ value. This work complements and confirms the results of several other very recent theoretical studies.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 13:36:25 GMT" }, { "version": "v2", "created": "Thu, 25 Sep 2008 07:31:42 GMT" } ]
2008-09-25T00:00:00
[ [ "Zhou", "Haijun", "" ] ]
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801.0206
Claude Viterbo
Claude Viterbo (DMA-Ecole Normale Sup\'erieure)
Symplectic Homogenization
104 pages, 6 figures
null
null
null
math.SG math.AP math.DS math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $H(q,p)$ be a Hamiltonian on $T^*T^n$. We show that the sequence $H_{k}(q,p)=H(kq,p)$ converges for the $\gamma$ topology defined by the author, to $\bar{H}(p)$. This is extended to the case where only some of the variables are homogenized, that is the sequence $H(kx,y,q,p)$ where the limit is of the type ${\bar H}(y,q,p)$ and thus yields an "effective Hamiltonian". We give here the proof of the convergence, and the first properties of the homogenization operator, and give some immediate consequences for solutions of Hamilton-Jacobi equations, construction of quasi-states, etc. We also prove that the function $\bar H$ coincides with Mather's $\alpha$ function which gives a new proof of its symplectic invariance proved by P. Bernard. A previous version of this paper relied on the former "On the capacity of Lagrangians in $T^*T^n$ which has been withdrawn. The present version of Symplectic Homogenization does not rely on it anymore.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:02:58 GMT" }, { "version": "v2", "created": "Fri, 19 Aug 2011 02:03:46 GMT" }, { "version": "v3", "created": "Wed, 13 Aug 2014 22:17:14 GMT" }, { "version": "v4", "created": "Mon, 11 Apr 2022 22:24:39 GMT" } ]
2022-04-13T00:00:00
[ [ "Viterbo", "Claude", "", "DMA-Ecole Normale Supérieure" ] ]
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801.0207
Myriam Maumy
Myriam Maumy (IRMA), B. Boulanger, W. Dewe, A. Gilbert, B. Govaerts
Risk management for analytical methods: conciliating objectives of methods, validation phase and routine decision rules
null
Dans Actes du congr\`es de Chimiom\'etrie 2005 - Risk management for analytical methods: conciliating objectives of methods, validation phase and routine decision rules., France (2005)
null
null
stat.AP math.ST stat.TH
null
In the industries that involved either chemistry or biology, such as pharmaceutical industries, chemical industries or food industry, the analytical methods are the necessary eyes and hear of all the material produced or used. If the quality of an analytical method is doubtful, then the whole set of decision that will be based on those measures is questionable. For those reasons, being able to assess the quality of an analytical method is far more than a statistical challenge; it's a matter of ethic and good business practices. Many regulatory documents have been releases, primarily ICH and FDA documents in the pharmaceutical industry (FDA, 1995, 1997, 2001) to address that issue.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:05:52 GMT" } ]
2008-01-03T00:00:00
[ [ "Maumy", "Myriam", "", "IRMA" ], [ "Boulanger", "B.", "" ], [ "Dewe", "W.", "" ], [ "Gilbert", "A.", "" ], [ "Govaerts", "B.", "" ] ]
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801.0208
Claude Viterbo
Claude Viterbo (CMLS-EcolePolytechnique)
On the capacity of Lagrangians in the cotangent disc bundle of the torus
This paper has been withdrawn by the author. 18 pages
null
null
null
math.SG
null
The paper is wihdrawn due to a critical error in the argument using the spectral sequence
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:06:30 GMT" }, { "version": "v2", "created": "Fri, 19 Aug 2011 01:57:08 GMT" } ]
2011-08-22T00:00:00
[ [ "Viterbo", "Claude", "", "CMLS-EcolePolytechnique" ] ]
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801.0209
Stefano Galatolo
Stefano Galatolo, Mathieu Hoyrup and Cristobal Rojas
Effective symbolic dynamics, random points, statistical behavior, complexity and entropy
null
null
null
null
math.DS cs.IT math.IT math.PR
null
We consider the dynamical behavior of Martin-L\"of random points in dynamical systems over metric spaces with a computable dynamics and a computable invariant measure. We use computable partitions to define a sort of effective symbolic model for the dynamics. Through this construction we prove that such points have typical statistical behavior (the behavior which is typical in the Birkhoff ergodic theorem) and are recurrent. We introduce and compare some notions of complexity for orbits in dynamical systems and prove: (i) that the complexity of the orbits of random points equals the Kolmogorov-Sina\"i entropy of the system, (ii) that the supremum of the complexity of orbits equals the topological entropy.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:38:57 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 14:56:19 GMT" } ]
2008-04-29T00:00:00
[ [ "Galatolo", "Stefano", "" ], [ "Hoyrup", "Mathieu", "" ], [ "Rojas", "Cristobal", "" ] ]
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801.021
Jin Min Yang
Jin Min Yang
Probing New Physics from Top Quark FCNC Processes at LHC: A Mini Review
7 pages, Talk given at 4th International Conference on Flavor Physics (ICFP 2007), Beijing, China, 24-28 Sep 2007
Int.J.Mod.Phys.A23:3343-3347,2008
10.1142/S0217751X08042092
null
hep-ph hep-ex
null
Since the top quark FCNC processes are extremely supressed in the Standard Model (SM) but could be greatly enhanced in some new physics models, they could serve as a smoking gun for new physics hunting at the LHC. In this brief review we summarize the new physics predictions for various top quark FCNC processes at the LHC by focusing on two typical models: the minimal supersymmetric model (MSSM) and the topcolor-assisted technicolor (TC2) model. The conclusion is: (1) Both new physics models can greatly enhance the SM predictions by several orders; (2) The TC2 model allows for largest enhancement, and for each channel the maximal prediction is much larger than in the MSSM; (3) Compared with the $3\sigma$ sensitivity at the LHC, only a couple of channels are accessible for the MSSM while most channles are accesible for the TC2 model.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:42:38 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 15:42:11 GMT" } ]
2010-10-27T00:00:00
[ [ "Yang", "Jin Min", "" ] ]
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801.0211
Naoto Kobayashi
Naoto Kobayashi, Chikako Yasui (IoA, Univ. of Tokyo), Alan T. Tokunaga (IfA, Univ. of Hawaii), Masao Saito (ALMA, NAOJ)
Extreme Outer Galaxy: A Laboratory of Star Formation in an Early Epoch of Galaxy Formation
2 pages, 1 figure, To appear in the proceedings of the conference "Formation and Evolution of Galaxy Disks", Rome, Italy, 1-5 October 2007, ASP Conf. Ser., eds. J. G. Funes and E. M. Corsini
null
null
null
astro-ph
null
The extreme outer Galaxy (EOG) has a very different environment from that in the solar neighborhood, with low metallicity (less than -0.5 dex), much lower gas density, and small or no perturbation from spiral arms. The EOG is an excellent laboratory for the study of the star formation processes that happened during the formation period of the Galaxy. In particular, the study of the EOG may shed light on the origin and role of the thick disk, whose metallicity range matches well with that of the EOG. We show an example of a molecular cloud in the EOG (Digel's Cloud 2), which is located at R_g ~ 20 kpc beyond the Outer arm. Based on our NIR and 12CO data as well as HI, radio continuum, and IRAS data in the archives, we examined the detailed star formation processes in this unique environment, especially the supernova triggered star formation, which should have been the major star formation mode during the halo and thick disk formation.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:46:03 GMT" } ]
2008-01-03T00:00:00
[ [ "Kobayashi", "Naoto", "", "IoA, Univ. of Tokyo" ], [ "Yasui", "Chikako", "", "IoA, Univ. of Tokyo" ], [ "Tokunaga", "Alan T.", "", "IfA, Univ. of Hawaii" ], [ "Saito", "Masao", "", "ALMA, NAOJ" ] ]
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801.0212
Sergey Cherkas L
K. A. Viarenich, V. L. Kalashnikov, S. L. Cherkas
Quantum mechanics of the closed collapsing Universe
8 pages 1 figire
Vestnik Belarus State U., ser. Fiz. 2 (2007) 3-7
null
null
gr-qc
null
Two approaches to quantization of Freedman's closed Universe are compared. In the first approach, the Shrodinger's norm of the wave function of Universe is used, and in the second approach, the Klein-Gordon's norm is used. The second one allows building the quasi-Heisenberg operators as functions of time and finding their average values. It is shown that the average value of the Universe scale factor oscillates with damping and approaches to some constant value at the end of the Universe evolution.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:52:18 GMT" } ]
2008-01-03T00:00:00
[ [ "Viarenich", "K. A.", "" ], [ "Kalashnikov", "V. L.", "" ], [ "Cherkas", "S. L.", "" ] ]
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801.0213
Irina Maximenko
Irina Maximenko
Support of Non-separable Multivariate Scaling Function
8 pages, no figures
null
null
null
math.CA
null
We make an estimation of the support of a multivariable scaling function for an arbitrary dilation matrix. We give a method of calculating the values of the scaling function on a tight set using the knowledge of the size of the support.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 14:58:00 GMT" } ]
2008-01-03T00:00:00
[ [ "Maximenko", "Irina", "" ] ]
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801.0214
Marat Akhmet
M.U. Akhmet
The discontinuous dynamics and non-autonomous chaos
30 pages, 3 figures
null
null
null
nlin.CD
null
A multidimensional chaos is generated by a special initial value problem for the non-autonomous impulsive differential equation. The existence of a chaotic attractor is shown, where density of periodic solutions, sensitivity of solutions and existence of a trajectory dense in the set of all orbits are observed. The chaotic properties of all solutions are discussed. An appropriate example is constructed, where the intermittency phenomenon is indicated. The results of the paper are illustrating that impulsive differential equations may play a special role in the investigation of the complex behavior of dynamical systems, different from that played by continuous dynamics.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 15:06:17 GMT" } ]
2008-01-03T00:00:00
[ [ "Akhmet", "M. U.", "" ] ]
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801.0215
Chiaki Kobayashi
Chiaki Kobayashi and Ken'ichi Nomoto
The Role of Type Ia Supernovae in Chemical Evolution I: Lifetime of Type Ia Supernovae and Galactic Supernova Rates
56 pages, 20 figures, accepted to ApJ
Astrophys.J.707:1466-1484,2009
10.1088/0004-637X/707/2/1466
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct a new model of Type Ia Supernovae (SNe Ia), based on the single degenerate scenario, taking account of the metallicity dependences of the white dwarf (WD) wind and the mass-stripping effect on the binary companion star. Our model naturally predicts that the SN Ia lifetime distribution spans a range of 0.1-20 Gyr with the double peaks at ~0.1 and 1 Gyr. While the present SN Ia rate in elliptical galaxies can be reproduced with the old population of the red-giants+WD systems, the large SN Ia rate in radio galaxies could be explained with the young population of the main-sequence+WD systems. Because of the metallicity effect, i.e., because of the lack of winds from WDs in the binary systems, the SN Ia rate in the systems with [Fe/H]<-1, e.g., high-z spiral galaxies, is supposed to be very small. Our SN Ia model can give better reproduction of the [(alpha, Mn, Zn)/Fe]-[Fe/H] relations in the solar neighborhood than other models such as the double-degenerate scenario. The metallicity effect is more strongly required in the presence of the young population of SNe Ia. We also succeed in reproducing the galactic supernova rates with their dependence on the morphological type of galaxies, and the cosmic SN Ia rate history with a peak at z~1. At z>1, the predicted SN Ia rate decreases toward higher redshifts and SNe Ia will be observed only in the systems that have evolved with a short timescale of chemical enrichment. This suggests that the evolution effect in the supernova cosmology can be small.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 15:10:30 GMT" }, { "version": "v2", "created": "Tue, 3 Nov 2009 17:08:40 GMT" }, { "version": "v3", "created": "Wed, 4 Nov 2009 04:23:02 GMT" } ]
2009-12-15T00:00:00
[ [ "Kobayashi", "Chiaki", "" ], [ "Nomoto", "Ken'ichi", "" ] ]
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801.0216
Ilya Lvovich Shapiro
Ilya L. Shapiro (UFJF, MG, Brazil)
Effective Action of Vacuum: Semiclassical Approach
54 pages, 2 figures, invited review paper partially based on various lecture courses, accepted in Classical and Quantum Gravity as topical review. A few changes compared to the original version: some relevant comments on black hole case and references added, typos corrected
Class.Quant.Grav.25:103001,2008
10.1088/0264-9381/25/10/103001
null
gr-qc astro-ph hep-ph hep-th
null
We present brief, to great extent pedagogical review on renormalization in curved space-time and of some recent results on the derivation and better understanding of quantum corrections to the action of gravity. The paper is mainly devoted to the semiclassical approach, but we also discuss its importance for quantum gravity and string theory.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 15:23:00 GMT" }, { "version": "v2", "created": "Wed, 9 Apr 2008 12:43:10 GMT" } ]
2008-11-26T00:00:00
[ [ "Shapiro", "Ilya L.", "", "UFJF, MG, Brazil" ] ]
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801.0217
Charles P. Boyer
Charles P. Boyer, Krzysztof Galicki, and Santiago R. Simanca
The Sasaki Cone and Extremal Sasakian Metrics
24 pages, to appear in the Proceedings of the Conference on Riemannian Topology, K. Galicki and S.R. Simanca Eds., Birkhauser, Boston
Proceedings of the Conference on Riemannian Topology, pg 263-290, K. Galicki & S. Simanca, Eds, Birkhauser, Boston, 2008.
null
null
math.DG
null
We study the Sasaki cone of a CR structure of Sasaki type on a given closed manifold. We introduce an energy functional over the cone, and use its critical points to single out the strongly extremal Reeb vectors fields. Should one such vector field be a member of the extremal set, the scalar curvature of a Sasaki extremal metric representing it would have the smallest $L^2$-norm among all Sasakian metrics of fixed volume that can represent vector fields in the cone. We use links of isolated hypersurface singularities to produce examples of manifolds of Sasaki type, many of these in dimension five, whose Sasaki cone coincides with the extremal set, and examples where the extremal set is empty. We end up by proving that a conjecture of Orlik concerning the torsion of the homology groups of these links holds in the five dimensional case.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 15:33:46 GMT" } ]
2009-11-23T00:00:00
[ [ "Boyer", "Charles P.", "" ], [ "Galicki", "Krzysztof", "" ], [ "Simanca", "Santiago R.", "" ] ]
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801.0218
In Yong Park
I. Y. Park
One loop scattering on D-branes
17 pages, 1 figure, refs added and adjusted, minor typos corrected, a version that will appear in EPJC
Eur.Phys.J.C62:783-791,2009
10.1140/epjc/s10052-009-1065-4
null
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze one loop scattering amplitudes of the massless states on a stack of D3-branes. We use the vertex operators that have been obtained in the direct open string analysis developed in arXiv:0708.3452. The method does not have the obstacle of the D9 computation which is associated with the appearance of an $\e$-tensor. The divergence structure is not the same as the D9 brane case. What makes the analysis deviate from the D9 brane case is that the momenta of the states have non-zero components only along the brane directions. We ponder on the possibility that the one-loop divergence may be canceled by adding additional vertex operators at the tree level. We anticipate that they will be "exponentiated" to the free string action, with the resulting action to constitute a non-linear sigma model of the D-brane/AdS geometry.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 16:01:00 GMT" }, { "version": "v2", "created": "Tue, 1 Jul 2008 01:09:27 GMT" }, { "version": "v3", "created": "Sat, 2 May 2009 16:17:33 GMT" } ]
2009-11-05T00:00:00
[ [ "Park", "I. Y.", "" ] ]
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801.0219
Bouzar Chikh
C. Bouzar, T. Saidi
Characterizations of algebras of rapidly decreasing generalized functions
null
Commun. Korean Math. Soc. 25, No. 3, p. 391-404, (2010)
null
null
math.FA math.AP
null
The well-known characterizations of Schwartz space $\mathcal{S}$ of rapidly decreasing functions is extended to the algebra $\mathcal{G}_{\mathcal{S}}$ of rapidly decreasing generalized functions and to the algebra $\mathcal{G}_{% \mathcal{S}}^{\infty}$ of regular rapidly decreasing generalized functions.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 17:01:12 GMT" } ]
2011-02-22T00:00:00
[ [ "Bouzar", "C.", "" ], [ "Saidi", "T.", "" ] ]
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801.022
Brant M. Johnson
PHENIX Collaboration: A. Adare, et al
J/psi Production in sqrt (s_NN)= 200 GeV Cu+Cu Collisions
375 authors from 57 institutions, 6 pages, 4 figures, 1 table. Published in Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are publicly available at http://www.phenix.bnl.gov/papers.html v2 has minor changes made during the PRL review process
Phys.Rev.Lett.101:122301,2008
10.1103/PhysRevLett.101.122301
null
nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Yields for J/psi production in Cu+Cu collisions at sqrt (s_NN)= 200 GeV have been measured by the PHENIX experiment over the rapidity range |y| < 2.2 at transverse momenta from 0 to beyond 5 GeV/c. The invariant yield is obtained as a function of rapidity, transverse momentum and collision centrality, and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data provide greatly improved precision over existing Au+Au data for J/psi production in collisions with small to intermediate numbers of participants, providing a key constraint that is needed for disentangling cold and hot nuclear matter effects.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 17:02:03 GMT" }, { "version": "v2", "created": "Wed, 14 Jan 2009 19:20:31 GMT" } ]
2009-01-14T00:00:00
[ [ "PHENIX Collaboration", "", "" ], [ "Adare", "A.", "" ] ]
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801.0221
Maryam Modjaz
Maryam Modjaz (1,2), R. P. Kirshner (2), S. Blondin (2), P. Challis (2), T. Matheson (3) ((1) UC Berkeley, (2) Harvard-Smithsonian CfA, (3) NOAO)
Double-peaked Oxygen Lines Are not Rare in Nebular Spectra of Core-Collapse Supernovae
5 pages, 3 figures, emulateapj, v2: accepted ApJ Letters version
null
10.1086/593135
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Double-peaked oxygen lines in the nebular spectra of two peculiar Type Ib/c Supernovae (SN Ib/c) have been interpreted as off-axis views of a GRB-jet or unipolar blob ejections. Here we present late-time spectra of 8 SN IIb, Ib and Ic and show that this phenomenon is common and should not be so firmly linked to extraordinary explosion physics. The line profiles are most likely caused by ejecta expanding with a torus- or disk-like geometry. Double-peaked oxygen profiles are not necessarily the indicator of a mis-directed GRB jet.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 17:28:28 GMT" }, { "version": "v2", "created": "Sat, 13 Sep 2008 08:36:26 GMT" } ]
2009-11-13T00:00:00
[ [ "Modjaz", "Maryam", "", "UC Berkeley", "Harvard-Smithsonian CfA" ], [ "Kirshner", "R. P.", "", "Harvard-Smithsonian CfA" ], [ "Blondin", "S.", "", "Harvard-Smithsonian CfA" ], [ "Challis", "P.", "", "Harvard-Smithsonian CfA" ], [ "Matheson", "T.", "", "NOAO" ] ]
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801.0222
Simon Gravel
Simon Gravel, Veit Elser
Divide and concur: A general approach to constraint satisfaction
4 pages, 2 figures
Phys. Rev. E 78, 036706 (2008)
10.1103/PhysRevE.78.036706
null
physics.comp-ph physics.data-an
null
Many difficult computational problems involve the simultaneous satisfaction of multiple constraints which are individually easy to satisfy. Such problems occur in diffractive imaging, protein folding, constrained optimization (e.g., spin glasses), and satisfiability testing. We present a simple geometric framework to express and solve such problems and apply it to two benchmarks. In the first application (3SAT, a boolean satisfaction problem), the resulting method exhibits similar performance scaling as a leading context-specific algorithm (walksat). In the second application (sphere packing), the method allowed us to find improved solutions to some old and well-studied optimization problems. Based upon its simplicity and observed efficiency, we argue that this framework provides a competitive alternative to stochastic methods such as simulated annealing.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 17:30:40 GMT" } ]
2008-10-01T00:00:00
[ [ "Gravel", "Simon", "" ], [ "Elser", "Veit", "" ] ]
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801.0223
Axel Krause
Axel Krause
Towards Dark Energy from String-Theory
20 pages, 1 figure; v2: references added
null
10.1142/9789812814357_0019
LMU-ASC 79/07
hep-th
null
We discuss vacuum energy in string and M-theory with a focus on heterotic M-theory. In the latter theory a mechanism is described for maintaining zero vacuum energy after supersymmetry breaking. Higher-order corrections can be expected to give a sufficiently small amount of vacuum energy to possibly account for dark energy.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 17:41:36 GMT" }, { "version": "v2", "created": "Wed, 12 Mar 2008 16:54:47 GMT" } ]
2017-08-23T00:00:00
[ [ "Krause", "Axel", "" ] ]
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801.0224
K. K. Szabo
K K Szabo
Dynamical fermions in lattice quantum chromodynamics
Ph.D. thesis (Advisor: Zoltan Fodor)
null
null
WUB-DIS 2007-10
hep-lat
null
The thesis will present results in Quantum Chromo Dynamics (QCD) with dynamical lattice fermions. The topological susceptibilty in QCD is determined, the calculations are carried out with dynamical overlap fermions. The most important properties of the quark-gluon plasma phase of QCD are studied, for which dynamical staggered fermions are used.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 17:45:27 GMT" } ]
2008-01-03T00:00:00
[ [ "Szabo", "K K", "" ] ]
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801.0225
Dawood Kothawala
Dawood A. Kothawala, S. Shankaranarayanan and L. Sriramkumar
Quantum gravitational corrections to the stress-energy tensor around the rotating BTZ black hole
v1. 7 pages, 2 figures; v2. 11 pages, 4 figures, discussion extended to the case of the rotating BTZ black hole, figures improved
JHEP0809:095,2008
10.1088/1126-6708/2008/09/095
null
hep-th gr-qc
null
Modes emerging out of a collapsing black hole are red-shifted to such an extent that Hawking radiation at future null infinity consists of modes that have energies beyond the Planck scale at past null infinity. This indicates that physics at the Planck scale may modify the spectrum of Hawking radiation and the associated stress-energy tensor of the quantum field. Recently, it has been shown that, the T-duality symmetry of string fluctuations along compact extra dimensions leads to a modification of the standard propagator of point particles in quantum field theory. At low energies (when compared to the string scale), the modified propagator is found to behave as though the spacetime possesses a minimal length, say, $\lp$, which we shall assume to be of the order of the Planck length. We utilize the duality approach to evaluate the modified propagator around the rotating Banados-Teitelboim-Zanelli black hole and show that the propagator is finite in the coincident limit. We compute the stress-energy tensor associated with the modified Green's function and illustrate graphically that the quantum gravitational corrections turn out to be negligibly small. We conclude by briefly commenting on the results we have obtained.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 17:49:13 GMT" }, { "version": "v2", "created": "Mon, 14 Apr 2008 08:50:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Kothawala", "Dawood A.", "" ], [ "Shankaranarayanan", "S.", "" ], [ "Sriramkumar", "L.", "" ] ]
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801.0226
Fang Chen
Fang Chen, James M. Cline, Sugumi Kanno
Modified Friedmann Equation and Inflation in Warped Codimension-two Braneworld
29 pages, 23 figures
Phys.Rev.D77:063531,2008
10.1103/PhysRevD.77.063531
null
hep-th astro-ph gr-qc hep-ph
null
We study the Friedmann equation for the warped codimension-two braneworld background which most closely resembles the Randall-Sundrum model. Extra matter on the (Planck) 4-brane, with equation of state p_\theta=(\alpha-1)\rho for the azimuthal pressure, is required to satisfy the junction conditions. For 1 < \alpha < 5, we show that there are two static solutions to the Einstein equations for given values of the brane stress-energies. Close to the static solutions, the relation between Hubble expansion rate H and brane tension reproduces the standard 4D result for small H, but exhibits unusual deviations when H is of order the AdS curvature scale. The two static branches for 1 <\alpha < 5 are shown to come together smoothly at a maximum value of H; however the radion is shown to be unstable in the branch with higher H. This remains true even with a mechanism for stabilization of the radion, i.e., the Goldberger-Wise (GW) mechanism, since large enough H overcomes the force of stabilization. Even in the unstabilized case, cosmological constraints on the time and spatial variation of Newton's constant are typically satisfied; only fifth force constraints require the stabilization. For \alpha > 5 the model is intrinsically stable, without the need for a GW field, and in this case we show that inflationary predictions can be modified by the nonstandard Friedmann equation; in particular it is possible to get an upper limit on the spectral index, large deviations from the consistency condition between the tensor spectrum and ratio r, and large running of the spectral index even though the slow roll parameters remain small.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 18:49:15 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 21:13:27 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Fang", "" ], [ "Cline", "James M.", "" ], [ "Kanno", "Sugumi", "" ] ]
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801.0227
Daniele Fargion
D. Fargion
Light Nuclei solving Auger puzzles. The Cen-A imprint
4 pages, 5 figures;
Phys.Scripta 78:045901,2008
10.1088/0031-8949/78/04/045901
stacks.iop.org/PhysScr/78/045901
astro-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ultra High Energy Cosmic Rays (UHECR) map at 60 EeV have been found recently by AUGER group spreading anisotropy signatures in the sky. The result have been interpreted as a manifestation of AGN sources ejecting protons at GZK edges mostly from Super-galactic Plane. The result is surprising due to the absence of much nearer Virgo cluster. Moreover, early GZK cut off in the spectra may be better reconcile with light nuclei (than with protons). In addition a large group (nearly a dozen) of events cluster suspiciously along Cen-A. Finally, proton UHECR composition nature is in sharp disagreement with earlier AUGER claim of a heavy nuclei dominance at 40 EeV. Therefore we interpret here the signals as mostly UHECR light nuclei (He, Be, B, C, O), very possibly mostly the lightest (He,Be) ones, ejected from nearest AGN Cen-A, UHECR smeared by galactic magnetic fields, whose random vertical bending is overlapping with super-galactic arm. The eventual AUGER misunderstanding took place because of such a rare coincidence between the Super Galactic Plane (arm) and the smeared (randomized) signals from Cen-A, bent orthogonally to the Galactic fields. Our derivation verify the consistence of the random smearing angles for He, Be and B, C, O, in reasonable agreement with the AUGER main group events around Cen-A. Only few other rare events are spread elsewhere. The most collimated from Cen-A are the lightest. The most spread the heavier. Consequently Cen-A is the best candidate UHE neutrino tau observable by HEAT and AMIGA as enhanced AUGER array at tens-hundred PeV energy. This model maybe soon tested by new events clustering around the Cen-A and by composition imprint study.
[ { "version": "v1", "created": "Wed, 2 Jan 2008 16:59:06 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 17:26:44 GMT" }, { "version": "v3", "created": "Mon, 4 Feb 2008 23:18:42 GMT" }, { "version": "v4", "created": "Thu, 7 Aug 2008 16:51:36 GMT" } ]
2009-06-23T00:00:00
[ [ "Fargion", "D.", "" ] ]
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801.0228
Gregory Gabadadze
Gregory Gabadadze and Rachel A. Rosen
Electrodynamic Metanuclei
1+9 pages; v2: 2 refs with comments added; v3: discussions and refs added, typos corrected
Phys.Lett.B666:277-282,2008
10.1016/j.physletb.2008.06.071
NYU-TH-07/12/24
hep-th hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A relativistic system of electrically charged fermions and oppositely charged massive scalars with no self-interactions, is argued to have a long-lived collective state with a net charge. The charge is residing near the surface of the spherically-symmetric state, while the interior consists of the condensed scalars, that are neutralized by the fermions. The metastability is achieved by competition of the negative pressure of the scalar condensate, against the positive pressure, mainly due to the fermions. We consider such metanuclei made of helium-4 nuclei and electrons, below nuclear but above atomic densities. Typical metanuclei represent charged balls of the atomic size, colossal mass, electric charge and excess energy. Unlike an ordinary nucleus, the charge of a metanucleus scales proportionately to its radius. The quantum mechanical decay through tunneling, and vacuum instability via pair-creation, are both suppressed for large values of the electric charge. Similar states could also be composed of other charged (pseudo)scalars, such as the pions, scalar supersymmetric partners, or in general, spin-0 states of new physics.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 18:37:36 GMT" }, { "version": "v2", "created": "Thu, 31 Jan 2008 15:45:11 GMT" }, { "version": "v3", "created": "Mon, 23 Jun 2008 14:47:13 GMT" } ]
2008-11-26T00:00:00
[ [ "Gabadadze", "Gregory", "" ], [ "Rosen", "Rachel A.", "" ] ]
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801.0229
Saptarshi Mandal
Saptarshi Mandal and Naveen Surendran
Exactly solvable Kitaev model in three dimensions
9 pages, 7 figures; published version; a new section and more references added
Phys. Rev. B 79, 024426 (2009)
10.1103/PhysRevB.79.024426
null
cond-mat.mes-hall cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a spin-1/2 model in three dimensions which is a generalization of the well-known Kitaev model on a honeycomb lattice. Following Kitaev, we solve the model exactly by mapping it to a theory of non-interacting fermions in the background of a static Z_2 gauge field. The phase diagram consists of a gapped phase and a gapless one, similar to the two-dimensional case. Interestingly, unlike in the two-dimensional model, in the gapless phase the gap vanishes on a contour in the k space. Furthermore, we show that the flux excitations of the gauge field, due to some local constraints, form loop like structures; such loops exist on a lattice formed by the plaquettes in the original lattice and is topologically equivalent to the pyrochlore lattice. Finally, we derive a low-energy effective Hamiltonian that can be used to study the properties of the excitations in the gapped phase.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 18:41:05 GMT" }, { "version": "v2", "created": "Thu, 29 Jan 2009 13:48:05 GMT" } ]
2013-05-29T00:00:00
[ [ "Mandal", "Saptarshi", "" ], [ "Surendran", "Naveen", "" ] ]
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801.023
Kevin Ann
Gregg Jaeger, Kevin Ann
Local basis-dependent noise-induced Bell-nonlocality sudden death in tripartite systems
8 pages, Physics Letters A (accepted 11/19/07)
null
10.1016/j.physleta.2007.11.036
null
quant-ph
null
We demonstrate that multipartite Bell-inequality violations can be fully destroyed in finite time in three-qubit systems subject only to the mechanism of local external asymptotic dephasing noise. This broadens the study of local-noise-induced sudden death of nonlocal behavior, extending it beyond the realm of bipartite systems, to which it had previously been restricted.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 20:11:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Jaeger", "Gregg", "" ], [ "Ann", "Kevin", "" ] ]
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801.0231
Wai-Yee Keung
Jae Ho Heo and Wai-Yee Keung
Electron Electric Dipole Moment induced by Octet-Colored Scalars
8 pages, 2 figures
Phys.Lett.B661:259-262,2008
10.1016/j.physletb.2008.02.021
null
hep-ph
null
An appended sector of two octet-colored scalars, each an electroweak doublet, is an interesting extension of the simple two Higgs doublet model motivated by the minimal flavor violation. Their rich CP violating interaction gives rise to a sizable electron electric dipole moment, besides the quark electric dipole moment via the two-loop contribution of Barr-Zee mechanism.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 19:04:28 GMT" } ]
2008-11-26T00:00:00
[ [ "Heo", "Jae Ho", "" ], [ "Keung", "Wai-Yee", "" ] ]
[ 0.0384354889, 0.000417627, -0.0486947708, 0.0928244069, -0.0848722383, 0.1102504581, -0.0036784925, 0.1058325917, -0.0432706065, -0.0133640645, 0.0040129009, -0.0553215817, -0.0228502173, -0.0244210176, 0.044325985, 0.0416998081, 0.0637155399, -0.0175733157, -0.0215493999, 0.0975858942, -0.1301799715, -0.0533089936, 0.1162391305, 0.0891428515, -0.0410371274, 0.0330604129, -0.0173156057, -0.0236847047, 0.0379446149, -0.0479584597, 0.0183587149, -0.0564996786, -0.1667992324, -0.1516802907, -0.0769691542, 0.0966041461, -0.0702932626, 0.0728458092, -0.1281183064, -0.0065715853, -0.0040405127, 0.0151189417, -0.0603775904, 0.0909099951, 0.033354938, -0.0134254238, 0.0039607454, -0.0217825659, 0.0549288802, 0.0224207025, 0.0354411528, 0.0720604062, 0.0458967872, -0.0760855824, -0.0295261145, -0.0172665175, -0.0485475101, 0.0436633043, -0.022543421, 0.025255505, 0.0422643125, -0.0673970953, -0.0512473211, 0.0792762637, -0.0280289464, -0.0557633676, -0.049725607, 0.0122964112, 0.0485965982, 0.0113821579, 0.0385827534, 0.0705386996, 0.0768709779, 0.0525726825, 0.1119194329, -0.1098577604, 0.0587577038, 0.0025218688, -0.0278816838, 0.0420188755, 0.0165424775, -0.0162724964, 0.0197086204, -0.0956714824, -0.047295779, -0.0253045913, -0.0531126447, 0.0453077368, -0.1026909873, 0.0465103798, 0.022077091, -0.0602303259, -0.0691642463, -0.0669062212, 0.0600830652, 0.0405707955, 0.0288388897, -0.0274889842, 0.0205799229, -0.005954924, -0.0534071699, 0.0375764593, 0.0749074817, -0.0234392677, 0.0944442973, 0.0105476705, 0.0616538636, -0.0462649427, 0.0107808355, 0.0420434177, 0.0720604062, 0.0565978549, -0.1108395085, -0.0206290092, -0.0094493385, -0.0409144089, -0.0435651317, 0.0040343767, -0.0785890445, 0.11957708, -0.0003879061, -0.0504128337, 0.0751038343, -0.0255991165, 0.0365210772, -0.0276362468, -0.084774062, -0.1710207462, -0.0246787257, -0.0200399607, 0.0375519171, -0.0190459397, 0.0063322838, 0.0384845771, -0.0499710478, 0.0113330698, -0.0194877256, 0.0075594708, 0.079619877, -0.0652863383, 0.1070106849, -0.0143580856, 0.0900264233, 0.0502655692, 0.0494310856, 0.0329867825, 0.0218561962, 0.0674952716, 0.0079521704, 0.0356865935, -0.0816815495, -0.0849704146, 0.0585122667, -0.0173524208, -0.0487684011, -0.0518363714, 0.053210821, 0.0569905527, -0.0224575177, -0.0093757072, 0.0597394519, 0.047025796, -0.0448659472, 0.00870689, 0.1055380628, 0.0437123924, -0.1462806612, -0.0306551252, -0.0572359934, -0.1797583252, -0.0349502787, -0.0988621712, -0.0585122667, -0.0807979777, 0.0606721155, 0.0627828762, -0.0114803324, -0.1552145779, -0.0302133393, 0.0069213333, 0.071618624, 0.1149628609, -0.0108667389, 0.0160147883, -0.0390245393, -0.0479830019, 0.1490295678, 0.0846758857, -0.0082712388, 0.0177083053, -0.0027719082, 0.1025928184, 0.0979785919, 0.0780981705, -0.0394663289, -0.0435405858, 0.0308514759, 0.1045563146, 0.0290597826, -0.0182605386, -0.0431233421, 0.0103390487, 0.0785399526, -0.1572762579, -0.0545361824, -0.0205799229, 0.0609666407, -0.0606230274, -0.0158797968, -0.0175119564, 0.0806016251, 0.0066697602, 0.0892901123, 0.0156834479, -0.1167300045, 0.0388527326, -0.0243842006, 0.0499465019, 0.0046050185, 0.0245314632, -0.1368558705, 0.053210821, 0.0750547424, 0.0754474401, -0.0092959395, 0.0017840228, -0.0464858338, 0.0006408216, 0.0482529849, 0.0566960312, 0.0392208882, -0.057334166, -0.0828596503, -0.0654335991, 0.0281025767, 0.0492101908, 0.0024804513, -0.0203958452, -0.0437614806, 0.0157570783, -0.022555694, -0.0332076736, 0.0389509089, 0.0541925691, -0.0342630558, 0.0163338557, 0.0416752622, -0.0047123972, 0.1056362391, -0.0358829424, 0.0816815495, 0.1270383745, 0.012750471, 0.0026706653, -0.0821724311, 0.0966041461 ]
801.0232
Patrizio Frosini
Patrizio Frosini
Does intelligence imply contradiction?
39 pages, 6 figures; added Remark 9 (page 19) and Remark 12 (page 25); changed some comments after Definition 13 and in Section 5; some minor changes
null
null
null
cs.AI cs.LO
null
Contradiction is often seen as a defect of intelligent systems and a dangerous limitation on efficiency. In this paper we raise the question of whether, on the contrary, it could be considered a key tool in increasing intelligence in biological structures. A possible way of answering this question in a mathematical context is shown, formulating a proposition that suggests a link between intelligence and contradiction. A concrete approach is presented in the well-defined setting of cellular automata. Here we define the models of ``observer'', ``entity'', ``environment'', ``intelligence'' and ``contradiction''. These definitions, which roughly correspond to the common meaning of these words, allow us to deduce a simple but strong result about these concepts in an unbiased, mathematical manner. Evidence for a real-world counterpart to the demonstrated formal link between intelligence and contradiction is provided by three computational experiments.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 19:07:22 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 11:16:24 GMT" } ]
2008-03-18T00:00:00
[ [ "Frosini", "Patrizio", "" ] ]
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801.0233
Victor Kreiman
V. Kreiman
Products of Factorial Schur Functions
10 pages; v2: result generalized slightly, references added, minor corrections in section 4
null
null
null
math.CO math.RT
null
The product of any finite number of factorial Schur functions can be expanded as a $Z[y]$-linear combination of Schur functions. We give a rule for computing the coefficients in such an expansion which generalizes a specialization of the Molev-Sagan rule, which in turn generalizes the classical Littlewood-Richardson rule.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 19:44:50 GMT" }, { "version": "v2", "created": "Tue, 4 Mar 2008 01:07:59 GMT" } ]
2008-03-04T00:00:00
[ [ "Kreiman", "V.", "" ] ]
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801.0234
Orlando Alvarez
Orlando Alvarez, Blazej Ruszczycki
Target Space Duality: The Dilaton Field
11 pages
null
null
null
hep-th
null
Classical target space duality transformations are studied for the non-linear sigma model with a dilaton field. Working within the framework of the Hamiltonian formalism we require the duality transformation to be a property only of the target spaces. We obtain a set of restrictions on the geometrical data.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 19:29:59 GMT" } ]
2008-01-03T00:00:00
[ [ "Alvarez", "Orlando", "" ], [ "Ruszczycki", "Blazej", "" ] ]
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801.0235
Orlando Alvarez
Orlando Alvarez, Blazej Ruszczycki
Target Space Duality III: Potentials
10 pages
null
null
null
hep-th
null
We generalize previous results on target space duality to the case where there are background fields and the sigma model lagrangian has a potential function.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 19:36:36 GMT" } ]
2008-01-03T00:00:00
[ [ "Alvarez", "Orlando", "" ], [ "Ruszczycki", "Blazej", "" ] ]
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801.0236
Orhan Cakir
O. Cakir, I. Turk Cakir, H. Duran Yildiz, R. Mehdiyev
Single Production of Fourth Family Quarks at the LHC
16 pages, 7 figures, 6 tables
Eur.Phys.J.C56:537-543,2008
10.1140/epjc/s10052-008-0685-4
null
hep-ph
null
We study the single production of the fourth family quarks through the process pp--> Q'jX at the Large Hadron Collider (LHC). We have calculated the decay widths and branching ratios of the fourth family quarks (b' and t') in the mass range 300-800 GeV. The cross sections of signal and background processes have been calculated in a Monte Carlo framework. It is shown that the LHC can discover single t' and b' quarks if the CKM matrix elements |V_{t'q}|,|V_{qb'}|>=0.01.
[ { "version": "v1", "created": "Wed, 2 Jan 2008 09:33:08 GMT" }, { "version": "v2", "created": "Mon, 11 Feb 2008 19:38:26 GMT" } ]
2008-11-26T00:00:00
[ [ "Cakir", "O.", "" ], [ "Cakir", "I. Turk", "" ], [ "Yildiz", "H. Duran", "" ], [ "Mehdiyev", "R.", "" ] ]
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801.0237
Stephen P. Martin
Stephen P. Martin
Diphoton decays of stoponium at the Large Hadron Collider
18 pages, typos corrected in paragraph after eq. (2.5), reference added
Phys.Rev.D77:075002,2008
10.1103/PhysRevD.77.075002
null
hep-ph
null
If the lighter top squark has no kinematically allowed two-body decays that conserve flavor, then it will form hadronic bound states. This is required in models that are motivated by the supersymmetric little hierarchy problem and obtain the correct thermal relic abundance of dark matter by top-squark-mediated neutralino annihilations, or by top-squark-neutralino co-annihilations. It is also found in models that can accommodate electroweak-scale baryogenesis within minimal supersymmetry. I study the prospects for detecting scalar stoponium from its diphoton decay mode at the Large Hadron Collider, updating and correcting previous work. Under favorable circumstances, this signal will be observable over background, enabling a uniquely precise measurement of the superpartner masses through a narrow peak in the diphoton invariant mass spectrum, limited by statistics and electromagnetic calorimeter resolutions.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 20:32:44 GMT" }, { "version": "v2", "created": "Fri, 29 Feb 2008 19:47:34 GMT" } ]
2008-11-26T00:00:00
[ [ "Martin", "Stephen P.", "" ] ]
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801.0238
S. G. Rajeev
S. G. Rajeev
Exact Solution of the Landau-Lifshitz Equations for a Radiating Charged Particle in The Coulomb Potential
2 figures; Figure added, also minor comments and corrections
AnnalsPhys.323:2654-2661,2008
10.1016/j.aop.2008.01.010
null
hep-th astro-ph math-ph math.DS math.MP nlin.SI physics.plasm-ph
null
We solve exactly the classical non-relativistic Landau-Lifshitz equations of motion for a charged particle moving in a Coulomb potential, including radiation damping. The general solution involves the Painleve transcendent of type II. It confirms our physical intuition that a negatively charged classical particle will spiral into the nucleus, supporting the the validity of the Landau-Lifshitz equation.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 20:34:33 GMT" }, { "version": "v2", "created": "Thu, 10 Jan 2008 18:55:03 GMT" } ]
2008-11-26T00:00:00
[ [ "Rajeev", "S. G.", "" ] ]
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801.0239
Kurasov Victor
Victor Kurasov
Different scenarios of the late stages of condensation
null
null
null
null
cond-mat.stat-mech
null
The late stages of the nucleation have been described analytically. The approximate solution of the Zel'dowich-Folmer-Frenkel equation has been constructed.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 20:39:22 GMT" } ]
2008-01-03T00:00:00
[ [ "Kurasov", "Victor", "" ] ]
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801.024
Luca Bombelli
Roman Sverdlov and Luca Bombelli
Gravity and Matter in Causal Set Theory
13 pages, no figures; In version 2, friendlier results than in version 1 are obtained following much shorter derivations
Class.Quant.Grav.26:075011,2009
10.1088/0264-9381/26/7/075011
null
gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The goal of this paper is to propose an approach to the formulation of dynamics for causal sets and coupled matter fields. We start from the continuum version of the action for a Klein-Gordon field coupled to gravity, and rewrite it first using quantities that have a direct correspondent in the case of a causal set, namely volumes, causal relations, and timelike lengths, as variables to describe the geometry. In this step, the local Lagrangian density $L(f;x)$ for a set of fields $f$ is recast into a quasilocal expression $L_0(f;p,q)$ that depends on pairs of causally related points $p \prec q$ and is a function of the values of $f$ in the Alexandrov set defined by those points, and whose limit as $p$ and $q$ approach a common point $x$ is $L(f;x)$. We then describe how to discretize $L_0(f;p,q)$, and use it to define a discrete action.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 20:52:14 GMT" }, { "version": "v2", "created": "Sun, 13 Jul 2008 20:57:58 GMT" } ]
2009-03-24T00:00:00
[ [ "Sverdlov", "Roman", "" ], [ "Bombelli", "Luca", "" ] ]
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801.0241
Natalia Litchinitser
Natalia M. Litchinitser, Andrei I. Maimistov, Ildar R. Gabitov, Roald Z. Sagdeev, Vladimir M. Shalaev
From Positive- to Negative-Index Materials: Transitional Phenomena
17 pages, 4 figures
null
null
null
physics.optics
null
Electromagnetic field propagation through a transition layer between the positive-index and negative-index materials with linearly changing dielectric permittivity and magnetic permeability was investigated. It is shown that at oblique incidence, the components of both TE- and TM-waves exhibit singular behavior in the vicinity of the point where both dielectric permittivity and magnetic permeability are equal to zero. In this case, finite dissipation of electromagnetic field energy takes place even at infinitesimally small values of losses. These results are applicable to a broader class of inhomogeneous metamaterials and may provide a new platform for the realization of low intensity nonlinear optics in metamaterials.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 21:33:17 GMT" }, { "version": "v2", "created": "Wed, 2 Jan 2008 22:14:31 GMT" }, { "version": "v3", "created": "Tue, 8 Apr 2008 20:20:01 GMT" } ]
2008-04-08T00:00:00
[ [ "Litchinitser", "Natalia M.", "" ], [ "Maimistov", "Andrei I.", "" ], [ "Gabitov", "Ildar R.", "" ], [ "Sagdeev", "Roald Z.", "" ], [ "Shalaev", "Vladimir M.", "" ] ]
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801.0242
Kurasov Victor
Victor Kurasov
Perturbative theory approaches to the metastable phase decay
null
null
null
null
cond-mat.stat-mech
null
The perturbative theory of the nucleation kinetics is analyzed. A new improvement is suggested and compared with numerical calculations.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 21:30:52 GMT" } ]
2008-01-03T00:00:00
[ [ "Kurasov", "Victor", "" ] ]
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801.0243
M. Vestergaard
M. Vestergaard (1,2), X. Fan (2), C.A. Tremonti (2), Patrick S. Osmer (3), Gordon T. Richards (4) ((1) Tufts University, (2) Steward Observatory, (3) The Ohio State University, (4) Drexel University)
Mass Functions of the Active Black Holes in Distant Quasars from the Sloan Digital Sky Survey Data Release 3
4 pages, two color figures, Accepted by Astrophysical Journal Letters, added references to section 3, clarified last sentence of section 5
null
10.1086/528981
null
astro-ph
null
We present the mass functions of actively accreting supermassive black holes over the redshift range 0.3 <= z <= 5 for a well-defined, homogeneous sample of 15,180 quasars from the Sloan Digital Sky Survey Data Release 3 (SDSS DR3) within an effective area of 1644 square degrees. This sample is the most uniform statistically significant subset available for the DR3 quasar sample. It was used for the DR3 quasar luminosity function, presented by Richards et al., and is the only sample suitable for the determination of the SDSS quasar black hole mass function. The sample extends from i = 15 to i = 19.1 at z less than about 3 and to i = 20.2 for z greater than about 3. The mass functions display a rise and fall in the space density distribution of active black holes at all epochs. Within the uncertainties the high-mass decline is consistent with a constant slope of beta of about -3.3 at all epochs. This slope is similar to the bright end slope of the luminosity function for epochs below z = 4. Our tests suggest that the down-turn toward lower mass values is due to incompleteness of the quasar sample with respect to black hole mass. Further details and analysis of these mass functions will be presented in forthcoming papers.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 22:05:16 GMT" }, { "version": "v2", "created": "Fri, 25 Jan 2008 20:45:16 GMT" } ]
2009-11-13T00:00:00
[ [ "Vestergaard", "M.", "" ], [ "Fan", "X.", "" ], [ "Tremonti", "C. A.", "" ], [ "Osmer", "Patrick S.", "" ], [ "Richards", "Gordon T.", "" ] ]
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801.0244
Benjamin Zeiger
B. R. Zeiger, W. F. Brisken, S. Chatterjee, W. M. Goss
Proper Motions of PSRs B1757-24 and B1951+32: Implications for Ages and Associations
LaTeX file uses emulateapj.cls; 7 pages, 4 figures, to be published ApJ February 10, 2008, v674 p271-278. Revision reflects journal formatting; there are no substantial revisions
null
10.1086/525276
null
astro-ph
null
Over the last decade, considerable effort has been made to measure the proper motions of the pulsars B1757-24 and B1951+32 in order to establish or refute associations with nearby supernova remnants and to understand better the complicated geometries of their surrounding nebulae. We present proper motion measurements of both pulsars with the Very Large Array, increasing the time baselines of the measurements from 3.9 yr to 6.5 yr and from 12.0 yr to 14.5 yr, respectively, compared to previous observations. We confirm the non-detection of proper motion of PSR B1757-24, and our measurement of (mu_a, mu_d) = (-11 +/- 9, -1 +/- 15) mas yr^{-1} confirms that the association of PSR B1757-24 with SNR G5.4-1.2 is unlikely for the pulsar characteristic age of 15.5 kyr, although an association can not be excluded for a significantly larger age. For PSR B1951+32, we measure a proper motion of (mu_a, mu_d) = (-28.8 +/- 0.9, -14.7 +/- 0.9) mas yr^{-1}, reducing the uncertainty in the proper motion by a factor of two compared to previous results. After correcting to the local standard of rest, the proper motion indicates a kinetic age of ~51 kyr for the pulsar, assuming it was born near the geometric center of the supernova remnant. The radio-bright arc of emission along the pulsar proper motion vector shows time-variable structure, but moves with the pulsar at an approximately constant separation ~2.5", lending weight to its interpretation as a shock structure driven by the pulsar.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 22:04:23 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 04:45:18 GMT" } ]
2009-11-13T00:00:00
[ [ "Zeiger", "B. R.", "" ], [ "Brisken", "W. F.", "" ], [ "Chatterjee", "S.", "" ], [ "Goss", "W. M.", "" ] ]
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801.0245
Don N. Page
Don N. Page
Our Place in a Vast Universe
14 pages, LaTeX, to be published in Melville Y. Stewart, ed., Science and Religion in Dialogue (Blackwell Publishing Inc., Oxford), from a series of lectures sponsored by the Templeton Foundation and given at Shandong University in Jinan, China, autumn 2007; see also arXiv:0801.0246 and arXiv:0801.0247
null
null
Alberta-Thy-19-07
physics.gen-ph gr-qc hep-th physics.hist-ph
null
Scientists have measured that what we can see of space is about a billion billion billion billion billion billion billion billion billion (10^81) times the volume of an average human. Inflationary theory suggests that the entirety of space is vastly larger. Quantum theory suggests that there are very many different copies of space of the same basic kind as ours (same laws of physics). String theory further suggests that there may be many different kinds of space. This whole collection of googolplexes of galaxies within each of googolplexes of different spaces within each of googols of kinds of space makes up an enormously vast universe or multiverse or holocosm. Human beings seem to be an incredibly small part of this universe in terms of physical size. Yet in other ways, we may still be a very significant part of our vast universe.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 22:39:51 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 21:05:58 GMT" } ]
2008-01-15T00:00:00
[ [ "Page", "Don N.", "" ] ]
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801.0246
Don N. Page
Don N. Page
Does God So Love the Multiverse?
26 pages, LaTeX, to be published in Melville Y. Stewart, ed., Science and Religion in Dialogue (Blackwell Publishing Inc., Oxford), from a series of lectures sponsored by the Templeton Foundation and given at Shandong University in Jinan, China, autumn 2007; see also arXiv:0801.0245 and arXiv:0801.0247
null
null
Alberta-Thy-20-07
physics.gen-ph hep-th
null
Monotheistic religions such as Judaism and Christianity affirm that God loves all humans and created them in His image. However, we have learned from Darwin that we were not created separately from other life on earth. Some Christians opposed Darwinian evolution because it undercut certain design arguments for the existence of God. Today there is the growing idea that the fine-tuned constants of physics might be explained by a multiverse with very many different sets of constants of physics. Some Christians oppose the multiverse for similarly undercutting other design arguments for the existence of God. However, undercutting one argument does not disprove its conclusion. Here I argue that multiverse ideas, though not automatically a solution to the problems of physics, deserve serious consideration and are not in conflict with Christian theology as I see it. Although this paper as a whole is {\it addressed} primarily to Christians in cosmology and others interested in the relation between the multiverse and theism, it should be of {\it interest} to a wider audience. Proper subsets of this paper are addressed to other Christians, to other theists, to other cosmologists, to other scientists, and to others interested in the multiverse and theism.
[ { "version": "v1", "created": "Wed, 2 Jan 2008 20:24:48 GMT" }, { "version": "v2", "created": "Mon, 7 Jan 2008 23:17:26 GMT" }, { "version": "v3", "created": "Wed, 9 Jan 2008 19:40:03 GMT" }, { "version": "v4", "created": "Thu, 17 Jan 2008 20:56:38 GMT" }, { "version": "v5", "created": "Thu, 17 Jan 2008 21:02:32 GMT" } ]
2008-01-17T00:00:00
[ [ "Page", "Don N.", "" ] ]
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801.0247
Don N. Page
Don N. Page
Scientific and Philosophical Challenges to Theism
25 pages, LaTeX, to be published in Melville Y. Stewart, ed., Science and Religion in Dialogue (Blackwell Publishing Inc., Oxford), from a series of lectures sponsored by the Templeton Foundation and given at Shandong University in Jinan, China, autumn 2007; see also arXiv:0801.0245 and arXiv:0801.0246
null
null
Alberta-Thy-21-07
physics.gen-ph hep-th
null
Modern science developed within a culture of Judeo-Christian theism, and science and theism have generally supported each other. However, there are certainly areas in both science and religion that puzzle me. Here I outline some puzzles that have arisen for me concerning everlasting life, human free will, divine free will, the simplicity and probability of God, the problem of evil, and the converse problem of elegance.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 22:47:15 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 21:11:43 GMT" }, { "version": "v3", "created": "Thu, 14 Feb 2008 17:02:18 GMT" } ]
2008-02-14T00:00:00
[ [ "Page", "Don N.", "" ] ]
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801.0248
Mu-Chun Chen
Mu-Chun Chen, D. R. Timothy Jones, Arvind Rajaraman, Hai-Bo Yu
Fermion Mass Hierarchy and Proton Stability from Non-anomalous U(1)_F in SUSY SU(5)
4 pages, 1 figure; v2: errors in anomaly cancellation aspect corrected, conclusions unchanged, references added; v3: references added, version to appear in Phys. Rev. D
Phys.Rev.D78:015019,2008
10.1103/PhysRevD.78.015019
UCI-TR-2007-54, LTH 790
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a realistic supersymmetric SU(5) model combined with a non-anomalous U(1)_F symmetry. We find a set of U(1)_F charges which automatically lead to the realistic mass hierarchy and mixing patterns for quarks, leptons and neutrinos. All gauge anomalies, including the [U(1)_F]^3 anomaly, are cancelled in our model without invoking the Green-Schwarz mechanism or having exotic fields. Proton decay mediated by dimension 5 operators is automatically suppressed in our model, because the scale set by the largest right-handed neutrino mass is much less than the GUT scale.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 22:27:41 GMT" }, { "version": "v2", "created": "Fri, 2 May 2008 16:41:02 GMT" }, { "version": "v3", "created": "Mon, 30 Jun 2008 18:22:55 GMT" } ]
2008-11-26T00:00:00
[ [ "Chen", "Mu-Chun", "" ], [ "Jones", "D. R. Timothy", "" ], [ "Rajaraman", "Arvind", "" ], [ "Yu", "Hai-Bo", "" ] ]
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801.0249
Reinhard Laubenbacher
Reinhard Laubenbacher, Abdul S. Jarrah, Henning Mortveit, and S.S. Ravi
A mathematical formalism for agent-based modeling
Prepared for the Encyclopedia of Complexity and System Science, Springer Verlag, 2008
null
null
null
cs.MA cs.DM math.CO
null
Many complex systems can be modeled as multiagent systems in which the constituent entities (agents) interact with each other. The global dynamics of such a system is determined by the nature of the local interactions among the agents. Since it is difficult to formally analyze complex multiagent systems, they are often studied through computer simulations. While computer simulations can be very useful, results obtained through simulations do not formally validate the observed behavior. Thus, there is a need for a mathematical framework which one can use to represent multiagent systems and formally establish their properties. This work contains a brief exposition of some known mathematical frameworks that can model multiagent systems. The focus is on one such framework, namely that of finite dynamical systems. Both, deterministic and stochastic versions of this framework are discussed. The paper contains a sampling of the mathematical results from the literature to show how finite dynamical systems can be used to carry out a rigorous study of the properties of multiagent systems and it is shown how the framework can also serve as a universal model for computation.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 23:22:50 GMT" } ]
2011-11-10T00:00:00
[ [ "Laubenbacher", "Reinhard", "" ], [ "Jarrah", "Abdul S.", "" ], [ "Mortveit", "Henning", "" ], [ "Ravi", "S. S.", "" ] ]
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801.025
Alexander K. Vidybida
A. K. Vidybida
Information processing at single neuron level
6 pages, 5 figures, "Modulation of neuronal signaling: Implications for visual perception", NATO ARW, July 12-21 2000, Nida, Lithuania
null
null
null
q-bio.NC
null
Based on numerical simulation of Hodgkin and Huxley type neuron stimulated from many synaptic inputs, an abstract concept of signal processing in individual neuron is proposed. In the concept proposed, neuron performs binding of synaptic inputs into a single output event, based on the degree of temporal coherence between the inputs. Inhibition serves as controlling factor of this type of binding.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 23:17:54 GMT" } ]
2008-01-03T00:00:00
[ [ "Vidybida", "A. K.", "" ] ]
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801.0251
Boris Kopeliovich
B.Z. Kopeliovich, H.-J. Pirner, I.K. Potashnikova, Ivan Schmidt, A.V. Tarasov
Perturbative fragmentation
10 pages, 8 figures
Phys.Rev.D77:054004,2008
10.1103/PhysRevD.77.054004
null
hep-ph
null
The Berger model of perturbative fragmentation of quarks to pions is improved by providing an absolute normalization and keeping all terms in a (1-z) expansion, which makes the calculation valid at all values of fractional pion momentum z. We also replace the nonrelativistic wave function of a loosely bound pion by the more realistic procedure of projecting to the light-cone pion wave function, which in turn is taken from well known models. The full calculation does not confirm the (1-z)^2 behavior of the fragmentation function (FF) predicted in for $z>0.5$, and only works at very large z>0.95, where it is in reasonable agreement with phenomenological FFs. Otherwise, we observe quite a different z-dependence which grossly underestimates data at smaller z. The disagreement is reduced after the addition of pions from decays of light vector mesons, but still remains considerable. The process dependent higher twist terms are also calculated exactly and found to be important at large z and/or pT.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 23:21:57 GMT" } ]
2008-11-26T00:00:00
[ [ "Kopeliovich", "B. Z.", "" ], [ "Pirner", "H. -J.", "" ], [ "Potashnikova", "I. K.", "" ], [ "Schmidt", "Ivan", "" ], [ "Tarasov", "A. V.", "" ] ]
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801.0252
Xiao-Liang Qi
Xiao-Liang Qi and Shou-Cheng Zhang
Spin Charge Separation in the Quantum Spin Hall State
acknowledgement and references revised
null
10.1103/PhysRevLett.101.086802
null
cond-mat.mes-hall cond-mat.str-el
null
The quantum spin Hall state is a topologically non-trivial insulator state protected by the time reversal symmetry. We show that such a state always leads to spin-charge separation in the presence of a $\pi$ flux. Our result is generally valid for any interacting system. We present a proposal to experimentally observe the phenomenon of spin-charge separation in the recently discovered quantum spin Hall system.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 23:24:50 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 21:42:46 GMT" } ]
2009-11-13T00:00:00
[ [ "Qi", "Xiao-Liang", "" ], [ "Zhang", "Shou-Cheng", "" ] ]
[ 0.0212532841, -0.0260891598, -0.1399165243, 0.0152447363, -0.0118719079, 0.0107997507, -0.1174905673, -0.0182266738, -0.0148315094, -0.1142740995, 0.0416354425, 0.0883636326, -0.0569136813, 0.1200816184, 0.0374138206, 0.0175454076, -0.0427969433, 0.1350024641, 0.1017655954, 0.1047140285, -0.1366107017, -0.06459748, 0.0714771524, -0.0015147014, -0.0771506503, -0.0089123072, 0.087246798, 0.0165737644, 0.0436457358, 0.0304224622, 0.0749616623, -0.0304894727, 0.0178022776, -0.0947072282, -0.0629445687, 0.1104322001, -0.1001573578, 0.0077396352, -0.1125765145, -0.0039479956, 0.0319636874, 0.027451694, -0.0905972943, 0.0994425863, 0.1591260135, 0.0703603253, 0.0162722208, -0.050525412, 0.0478896908, -0.0001039176, -0.0325667784, 0.0018162456, 0.0030210265, -0.0237884894, -0.0573157407, 0.0003933338, -0.0255307462, 0.0791609436, 0.0431766659, -0.0507487766, 0.0231407285, -0.0657143071, 0.011173889, 0.044405181, -0.0828688219, 0.0389997214, -0.0436904095, 0.0525803789, 0.01528941, -0.0132679464, -0.0494979285, -0.004766074, 0.123834163, 0.0302661061, 0.0259328038, -0.0123633137, -0.1031057909, 0.012553175, 0.0442264862, 0.0696902201, -0.0359619409, -0.0479790382, 0.1094493866, -0.0193546731, -0.069064796, 0.0280324463, -0.0018441664, 0.0560202189, -0.0115815327, -0.03781588, 0.0571370497, 0.0791162699, -0.0871574506, -0.0769272819, 0.0885869935, 0.0008892763, 0.147868365, -0.042528905, 0.0130445799, 0.0829134956, -0.1053394526, -0.0214766506, -0.0294619892, 0.0736661404, 0.1422395259, -0.0142507572, -0.0269379523, 0.0849237889, -0.0890337303, -0.0222137589, 0.089078404, -0.0153899239, -0.0413227305, 0.0490065217, -0.0668758079, -0.0744255856, -0.0006788236, -0.1153462529, -0.09354572, 0.1331261992, 0.0303331167, 0.0079518333, 0.0058521917, -0.0271613169, -0.003040571, -0.0966728479, -0.0275187045, -0.1165077612, -0.064463459, 0.0132679464, 0.0409653448, 0.0077396352, 0.0121399472, -0.0859959498, 0.0934563801, -0.0791609436, 0.0239001736, -0.0473982878, -0.0104200291, -0.0391784124, 0.0779547691, -0.0778654218, 0.1117723957, 0.0544566549, 0.1314286143, 0.0079071596, 0.0806798339, 0.0248159729, 0.0438020937, -0.0376148522, 0.0465494953, -0.0401612259, -0.0029260959, 0.0989065096, 0.0266029034, -0.0204156619, 0.0314052738, 0.0231407285, 0.0347781032, -0.0316286385, 0.0470409021, 0.0537418835, -0.0619617552, -0.0579411648, 0.0547246933, -0.0510168187, -0.0699135885, 0.0279877726, -0.0379945748, -0.0633912981, -0.0127430363, -0.1131125912, -0.0818413422, 0.0003347001, 0.097298272, 0.0368777439, -0.0248606466, -0.111861743, -0.0288142264, 0.0637486875, 0.0262901895, 0.0402282365, 0.0404516011, -0.0288142264, -0.0186845735, 0.0425512418, 0.0289035738, 0.1112363189, 0.0254413988, 0.0719238818, -0.0658483282, 0.0388880372, -0.0038167683, 0.0649995357, -0.0466835164, -0.0241012014, 0.0756317601, 0.0991745517, 0.0277197324, -0.0483810976, -0.0275633764, 0.0426405892, 0.0096047428, -0.0211416017, 0.0447402298, 0.0378382169, 0.1026590616, -0.0414790846, -0.0398931839, -0.0686180666, 0.0214654822, 0.0799203888, 0.0923842192, -0.0130110756, -0.0276973974, 0.0725046396, -0.0037581346, -0.0155127756, 0.0338399634, 0.0700029358, 0.0208400581, 0.0065167062, 0.0120952744, 0.135717243, -0.0226604901, 0.0633466244, -0.000915801, -0.0137928566, 0.0179586336, 0.0556628332, -0.0426852629, 0.0518656075, -0.0147868358, -0.0199800972, -0.0096270787, -0.0570477024, -0.0330358446, -0.0046348465, -0.0889890566, -0.072951369, -0.0572710671, 0.1140954047, -0.0102413362, 0.0783568248, 0.0382402763, -0.0033979567, -0.0430203117, -0.0479343645, 0.1437584162, -0.0441594794, -0.1173118725, 0.071387805, -0.0537418835, 0.0024137499, -0.0680819899, -0.0217670258 ]
801.0253
William Bialek
Greg J. Stephens and William Bialek
Toward a statistical mechanics of four letter words
null
null
10.1103/PhysRevE.81.066119
null
q-bio.NC cs.CL physics.data-an physics.soc-ph
null
We consider words as a network of interacting letters, and approximate the probability distribution of states taken on by this network. Despite the intuition that the rules of English spelling are highly combinatorial (and arbitrary), we find that maximum entropy models consistent with pairwise correlations among letters provide a surprisingly good approximation to the full statistics of four letter words, capturing ~92% of the multi-information among letters and even "discovering" real words that were not represented in the data from which the pairwise correlations were estimated. The maximum entropy model defines an energy landscape on the space of possible words, and local minima in this landscape account for nearly two-thirds of words used in written English.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 23:51:51 GMT" } ]
2013-05-29T00:00:00
[ [ "Stephens", "Greg J.", "" ], [ "Bialek", "William", "" ] ]
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801.0254
Reinhard Laubenbacher
Reinhard Laubenbacher and Brandilyn Stigler
Design of experiments and biochemical network inference
To appear in "Algebraic and geometric methods in statistics," P. Gibilisco, E. Riccomagno, M.-P. Rogantin, H. P. Wynn, eds., Cambridge University Press, 2008
Algebraic and Geometric Methods in Statistics. Eds: Gibilisco, Riccomagno, Rogantin, Wynn, Cambridge University Press (2008)
null
null
q-bio.MN stat.AP
null
Design of experiments is a branch of statistics that aims to identify efficient procedures for planning experiments in order to optimize knowledge discovery. Network inference is a subfield of systems biology devoted to the identification of biochemical networks from experimental data. Common to both areas of research is their focus on the maximization of information gathered from experimentation. The goal of this paper is to establish a connection between these two areas coming from the common use of polynomial models and techniques from computational algebra.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 23:52:47 GMT" } ]
2019-07-12T00:00:00
[ [ "Laubenbacher", "Reinhard", "" ], [ "Stigler", "Brandilyn", "" ] ]
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801.0255
Chaoxing Liu
Chao-Xing Liu, Bin Zhou, Shun-Qing Shen, and Bang-fen Zhu
Current-induced Spin Polarization in Two-Dimensional Hole Gas
13 pages, 8 figures, submitted to PRB
null
10.1103/PhysRevB.77.125345
null
cond-mat.mes-hall
null
We investigate the current-induced spin polarization in the two-dimensional hole gas (2DHG) with the structure inversion asymmetry. By using the perturbation theory, we re-derive the effective $k$-cubic Rashba Hamiltonian for 2DHG and the generalized spin operators accordingly. Then based on the linear response theory we calculate the current-induced spin polarization both analytically and numerically with the disorder effect considered. We have found that, quite different from the two-dimensional electron gas, the spin polarization in 2DHG depends linearly on Fermi energy in the low doping regime, and with increasing Fermi energy, the spin polarization may be suppressed and even changes its sign. We predict a pronounced peak of the spin polarization in 2DHG once the Fermi level is somewhere between minimum points of two spin-split branches of the lowest light-hole subband. We discuss the possibility of measurements in experiments as regards the temperature and the width of quantum wells.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 23:56:24 GMT" } ]
2009-11-13T00:00:00
[ [ "Liu", "Chao-Xing", "" ], [ "Zhou", "Bin", "" ], [ "Shen", "Shun-Qing", "" ], [ "Zhu", "Bang-fen", "" ] ]
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801.0256
Fu-Guo Deng
Fu-Guo Deng, Xi-Han Li, and Hong-Yu Zhou
Passively self-error-rejecting qubit transmission over a collective-noise channel
9 pages, 4 figures. The finial version of arXiv:0801.0256 after it is originally submitted online on 1 Jan 2008
Quantum Information and Computation, 11 (2011) 0913 - 0924
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a passively self-error-rejecting single-qubit transmission scheme for an arbitrary polarization state of a single qubit over a collective-noise channel, without resorting to additional qubits and entanglement. By splitting a single qubit into some wavepackets with some Mach-Zehnder interferometers, we can obtain an uncorrupted state with a success probability approaching 100% via postselection in different time bins, independent of the parameters of collective noise. It is simpler and more flexible than the schemes utilizing decoherence-free subspace and those with additional qubits. One can directly apply this scheme to almost all quantum communication protocols based on single photons or entangled photon systems against a collective noise.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 00:05:42 GMT" }, { "version": "v2", "created": "Thu, 22 Sep 2011 16:19:33 GMT" }, { "version": "v3", "created": "Sun, 25 Sep 2011 16:51:27 GMT" } ]
2011-09-27T00:00:00
[ [ "Deng", "Fu-Guo", "" ], [ "Li", "Xi-Han", "" ], [ "Zhou", "Hong-Yu", "" ] ]
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801.0257
Changhyun Ahn
Changhyun Ahn
More on Meta-Stable Brane Configuration by Quartic Superpotential for Fundamentals
16 pp, 4 figures; second paragraph of section 1, figures 2, 3, 4, the last paragraph of page 5, the equation (2.1) and the footnote 2 are improved and to appear in PLB
Phys.Lett.B663:125-131,2008
10.1016/j.physletb.2008.03.063
null
hep-th
null
For the case where the gauge theory superpotential has a quartic term as well as the mass term for quarks, the nonsupersymmetric meta-stable brane configuration was found recently. By adding the orientifold 6-planes and the extra fundamental flavors to this brane configuration, we describe the meta-stable nonsupersymmetric vacua of the gauge theory with antisymmetric flavor as well as fundamental flavors in type IIA string theory.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 00:20:11 GMT" }, { "version": "v2", "created": "Wed, 26 Mar 2008 01:01:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Ahn", "Changhyun", "" ] ]
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801.0258
Joseph O'Rourke
Nadia Benbernou, Joseph O'Rourke
On the Maximum Span of Fixed-Angle Chains
28 pages, 21 figures. Preliminary version appeared in Proc. 18th Canad. Conf. Comput. Geom., pages 93-96, 2006. This paper has been withdrawn by the authors. Lemma 15 as stated is incorrect, and although we believe the main theorems following (Thms. 17 & 18) are true, the proofs relying on Lem.15 are not valid
null
null
Smith Computer Science 088
cs.CG
null
Soss proved that it is NP-hard to find the maximum 2D span of a fixed-angle polygonal chain: the largest distance achievable between the endpoints in a planar embedding. These fixed-angle chains can serve as models of protein backbones. The corresponding problem in 3D is open. We show that three special cases of particular relevance to the protein model are solvable in polynomial time. When all link lengths and all angles are equal, the maximum 3D span is achieved in a flat configuration and can be computed in constant time. When all angles are equal and the chain is simple (non-self-crossing), the maximum flat span can be found in linear time. In 3D, when all angles are equal to 90 deg (but the link lengths arbitrary), the maximum 3D span is in general nonplanar but can be found in quadratic time.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 04:17:20 GMT" }, { "version": "v2", "created": "Wed, 2 Jun 2010 12:02:30 GMT" } ]
2010-06-03T00:00:00
[ [ "Benbernou", "Nadia", "" ], [ "O'Rourke", "Joseph", "" ] ]
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801.0259
Fu-Guo Deng
Bao-Kui Zhao, Yu-Bo Sheng, Fu-Guo Deng, Feng-Shou Zhang and Hong-Yu Zhou
Stable and deterministic quantum key distribution based on differential phase shift
5 pages, 2 figures
Int. J. Quant. Inform. 7 (2009) 739-745
null
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a stable and deterministic quantum key distribution (QKD) system based on differential phase shift. With three cascaded Mach-Zehnder interferometers with different arm-length differences for creating key, its key creation efficiency can be improved to be 7/8, more than other systems. Any birefringence effects and polarization-dependent losses in the long-distance fiber are automatically compensated with a Faraday mirror. Added an eavesdropping check, this system is more secure than some other phase-coding-based QKD systems. Moreover, the classical information exchanged is reduces largely and the modulation of phase shifts is simplified. All these features make this QKD system more convenient than others in a practical application.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 00:21:44 GMT" }, { "version": "v2", "created": "Sun, 16 Aug 2009 14:50:07 GMT" } ]
2009-08-17T00:00:00
[ [ "Zhao", "Bao-Kui", "" ], [ "Sheng", "Yu-Bo", "" ], [ "Deng", "Fu-Guo", "" ], [ "Zhang", "Feng-Shou", "" ], [ "Zhou", "Hong-Yu", "" ] ]
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801.026
Nour-Eddine Raouafi
N.-E. Raouafi, J. W. Harvey and C. J. Henney
On the Latitude Distribution of the Polar Magnetic Flux as Observed by SOLIS-VSM
4 pages, 2 figure, conference
null
null
null
astro-ph
null
Magnetograms from the Vector SpectroMagnetograph (VSM) of the Synoptic Optical Long-term Investigations of the Sun (SOLIS) project are utilized to study the latitude distribution of magnetic flux elements as a function of latitude in the polar solar caps. We find that the density distribution of the magnetic flux normalized by the surface of the polar cap and averaged over months decreases close to the solar poles. This trend is more pronounced when considering only flux elements with relatively large size. The flux density of the latter is relatively flat from the edge of the polar cap up to latitudes of 70$^\circ$--75$^\circ$ and decreases significantly to the solar pole. The density of smaller flux features is more uniformly distributed although the decrease is still present but less pronounced. This result is important in studying meridional flows that bring the magnetic flux from lower to higher solar latitudes resulting in the solar cycle reversal. The results are also of importance in studying polar structures contributing to the fast solar wind, such as polar plumes.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 00:33:19 GMT" } ]
2008-01-03T00:00:00
[ [ "Raouafi", "N. -E.", "" ], [ "Harvey", "J. W.", "" ], [ "Henney", "C. J.", "" ] ]
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801.0261
Donu Arapura
Donu Arapura
An Abelian Category of Motivic Sheaves
Final revision. To appear in Adv. Math. 72 pages
null
null
null
math.AG math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The goal of this paper is to construct a category of motivic "sheaves" on an algebraic variety defined over a subfield of C, using Nori's method. This categoryis abelian and it possesses faithful exact realization functors to the categoriesof constructible sheaves for the classical and etale topologies. Moreover, there is a tannakian subcategory of motivic local systems with a realization functor into the category of variations of mixed Hodge structures. Conversely, all basic geometric examples of the latter come from this motivic category.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 00:44:57 GMT" }, { "version": "v2", "created": "Mon, 12 Apr 2010 16:10:46 GMT" }, { "version": "v3", "created": "Mon, 21 Feb 2011 22:57:22 GMT" }, { "version": "v4", "created": "Tue, 9 Oct 2012 23:02:04 GMT" } ]
2012-10-11T00:00:00
[ [ "Arapura", "Donu", "" ] ]
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801.0262
Pavel Buividovich
M. I. Polikarpov and P. V. Buividovich
Z2 electric strings and center vortices in SU(2) lattice gauge theory
Talk presented at the 13th Lomonosov Conference on Elementary Particle Physics, Moscow State University, August 23-29, 2007. 5 pages RevTeX
null
null
ITEP-LAT/2008-01
hep-lat
null
We study the representations of SU(2) lattice gauge theory in terms of sums over the worldsheets of center vortices and Z2 electric strings, i.e. surfaces which open on the Wilson loop. It is shown that in contrast to center vortices the density of electric Z2 strings diverges in the continuum limit of the theory independently of the gauge fixing, however, their contribution to the Wilson loop yields physical string tension due to non-positivity of their statistical weight in the path integral, which is in turn related to the presence of Z2 topological monopoles in the theory.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 01:31:05 GMT" } ]
2008-01-03T00:00:00
[ [ "Polikarpov", "M. I.", "" ], [ "Buividovich", "P. V.", "" ] ]
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801.0263
Henry Tsz-King Wong
TEXONO Collaboration: H.Y. Liao, et al
Production and Decay of the Ge73-m Metastable State in a Low-Background Germanium Detector
16 pages, 10 figures
J.Phys.G35:077001,2008
10.1088/0954-3899/35/7/077001
AS-TEXONO/08-02
nucl-ex
null
The $\ge73m$ metastable states decay with a very characteristic signature which allow them to be tagged event-by-event. Studies were performed using data taken with a high-purity germanium detector in a low-background laboratory near a nuclear power reactor core where $\nuebar$-flux was $\rm{6.4 \times 10^{12} ~ cm^{-2} s^{-1}}$. The measured average and equilibrium production rates of $\ge73m$ were $\rm{(8.7 \pm 0.4)}$ and $\rm{(6.7 \pm 0.3) ~ kg^{-1} day^{-1}}$, respectively. The production channels were studied and identified. By studying the difference in the production of $\ge73m$ between the reactor ON and OFF spectra, the limiting sensitivities at the range of $\rm{\sim 10^{-42} - 10^{-43} ~ cm^2}$ for the cross-sections of neutrino-induced nuclear transitions were derived. The dominant background are due to $\beta$-decays of cosmic-ray induced $^{73}$Ga. The prospects of enhancing the sensitivities at underground locations are discussed.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 01:18:40 GMT" }, { "version": "v2", "created": "Thu, 15 May 2008 06:08:27 GMT" } ]
2008-11-26T00:00:00
[ [ "TEXONO Collaboration", "", "" ], [ "Liao", "H. Y.", "" ] ]
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801.0264
Alex Lazarian
A. Lazarian, G. Kowal, A. Beresnyak
Density Statistics of Compressible MHD Turbulence
8 pages, review for ASTRONUM-2007 Meeting
null
null
null
astro-ph
null
Density is the turbulence statistics that is most readily available from observations. Different regimes of turbulence correspond to different density spectra. For instance, the viscosity-damped regime of MHD turbulence relevant, for instance, to partially ionized gas, can be characterized by shallow and very anisotropic spectrum of density. This spectrum can result in substantial variations of the column densities. Addressing MHD turbulence in the regime when viscosity is not important over the inertial range, we demonstrate with numerical simulations that it is possible to reproduce both the observed Kolmogorov spectrum of density fluctuations observed in ionized gas by measuring scintillations and more shallow spectra that are obtained through the emission measurements. We show that in supersonic turbulence the high density peaks dominate shallow isotropic spectrum, while the small-scale underlying turbulence that fills most of the volume has the Kolmogorov spectrum and demonstrates scale-dependent anisotropy. The limitations of the spectrum in studying turbulence induce searches of alternative statistics. We demonstrate that a measure called "bispectrum" may be a promising tool. Unlike spectrum, the bispectrum preserves the information about wave phases.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 02:04:59 GMT" } ]
2008-01-03T00:00:00
[ [ "Lazarian", "A.", "" ], [ "Kowal", "G.", "" ], [ "Beresnyak", "A.", "" ] ]
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801.0265
Alex Lazarian
A. Lazarian, T. Hoang
Alignment of Dust with Magnetic Inclusions: Radiative Torques and Superparamagnetic Barnett and Nuclear Relaxation
5 pages, emulated ApJ style, 2 figures, submitted to ApJL (earlier version was corrupted)
2008, ApJ 676L, 25
10.1086/586706
null
astro-ph
null
We consider grains with superparamagnetic inclusions and report two new condensed matter effects that can enhance the internal relaxation of the energy of a wobbling grain, namely, superparamagnetic Barnett relaxation, as well as, an increase of frequencies for which nuclear relaxation becomes important. This findings extends the range of grain sizes for which grains are thermally trapped, i.e. rotate thermally, in spite of the presence of uncompensated pinwheel torques. In addition, we show that the alignment of dust grains by radiative torques gets modified for superparamagnetic grains, with grains obtaining perfect alignment with respect to magnetic fields as soon as the grain gaseous randomization time gets larger than that of paramagnetic relaxation. The same conclusion is valid for the mechanical alignment of helical grains. If observations confirm that the degrees of alignment are higher than radiative torques can produce alone, this may be a proof of the presence of superparamagentic inclusions.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 02:13:47 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 17:34:01 GMT" } ]
2009-11-13T00:00:00
[ [ "Lazarian", "A.", "" ], [ "Hoang", "T.", "" ] ]
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801.0266
Alex Lazarian
T. Hoang, A. Lazarian
Radiative torques alignment in the presence of pinwheel torques
23 pages and 15 figures emulated ApJ style. Thermal flipping and trapping revised; paper accepted to ApJ
Astrophys.J.695:1457-1476,2009
10.1088/0004-637X/695/2/1457
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the alignment of grains subject to both radiative torques and pinwheel torques while accounting for thermal flipping of grains. By pinwheel torques we refer to all systematic torques that are fixed in grain body axes, including the radiative torques arising from scattering and absorption of isotropic radiation. We discuss new types of pinwheel torques, which are systematic torques arising from infrared emission and torques arising from the interaction of grains with ions and electrons in hot plasma. We show that both types of torques are long-lived, i.e. may exist longer than gaseous damping time. We compare these torques with the torques introduced by E. Purcell, namely, torques due to H$_2$ formation, the variation of accommodation coefficient for gaseous collisions and photoelectric emission. Furthermore, we revise the Lazarian & Draine model for grain thermal flipping. We calculate mean flipping timescale induced by Barnett and nuclear relaxation for both paramagnetic and superparamagnetic grains, in the presence of stochastic torques associated with pinwheel torques, e.g. the stochastic torques arising from H$_2$ formation, and gas bombardment. We show that the combined effect of internal relaxation and stochastic torques can result in fast flipping for sufficiently small grains and, because of this, they get thermally trapped, i.e. rotate thermally in spite of the presence of pinwheel torques. For sufficiently large grains, we show that the pinwheel torques can increase the degree of grain alignment achievable with the radiative torques by increasing the magnitude of the angular momentum of low attractor points and/or by driving grains to new high attractor points.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 02:44:46 GMT" }, { "version": "v2", "created": "Mon, 2 Feb 2009 22:48:37 GMT" } ]
2009-06-23T00:00:00
[ [ "Hoang", "T.", "" ], [ "Lazarian", "A.", "" ] ]
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801.0267
Zhi-Gang Wang
Z. G. Wang
Structure of the $(0^+,1^+)$ mesons $B_{s0}$ and $B_{s1}$, and the strong coupling constants $g_{B_{s0} B K}$ and $g_{B_{s1} B^* K}$
16 pages, 3 figures, third version, add two sum rules in the heavy quark limit
Phys.Rev.D77:054024,2008
10.1103/PhysRevD.77.054024
null
hep-ph
null
In this article, we take the point of view that the bottomed $(0^+,1^+)$ mesons $B_{s0}$ and $B_{s1}$ are the conventional $b\bar{s}$ meson, and calculate the strong coupling constants $g_{B_{s0} B K}$ and $g_{B_{s1} B^* K}$ with the light-cone QCD sum rules. The numerical values of strong coupling constants $g_{B_{s1} B^* K}$ and $g_{B_{s0} B K}$ are very large, and support the hadronic dressing mechanism. Just like the scalar mesons $f_0(980)$, $a_0(980)$, $D_{s0}$ and axial-vector meson $D_{s1}$, the $(0^+,1^+)$ bottomed mesons $B_{s0}$ and $B_{s1}$ may have small $b\bar{s}$ kernels of the typical $b\bar{s}$ meson size, the strong couplings to the hadronic channels (or the virtual mesons loops) may result in smaller masses than the conventional $b\bar{s}$ mesons in the potential quark models, and enrich the pure $b\bar{s}$ states with other components.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 03:23:42 GMT" }, { "version": "v2", "created": "Thu, 24 Jan 2008 13:28:20 GMT" }, { "version": "v3", "created": "Sun, 17 Feb 2008 09:20:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Wang", "Z. G.", "" ] ]
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801.0268
Yongli Ping
Yongli Ping, Lixin Xu, Hongya Liu, Ying Shao
Power-law cosmological solution derived from DGP brane with a brane tachyon field
8 pages, 1 figure, accepted by IJMPD
null
10.1142/S0218271808013686
null
hep-th
null
By studying a tachyon field on the DGP brane model, in order to embed the 4D standard Friedmann equation with a brane tachyon field in 5D bulk, the metric of the 5D spacetime is presented. Then, adopting the inverse square potential of tachyon field, we obtain an expanding universe with power-law on the brane and an exact 5D solution.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 03:26:45 GMT" } ]
2009-11-13T00:00:00
[ [ "Ping", "Yongli", "" ], [ "Xu", "Lixin", "" ], [ "Liu", "Hongya", "" ], [ "Shao", "Ying", "" ] ]
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801.0269
Ruslan Prozorov
R. Gordon, M. D. Vannette, C. Martin, Y. Nakajima, T. Tamegai, R. Prozorov
Two-gap superconductivity in single crystal Lu$_2$Fe$_3$Si$_5$ from penetration depth measurements
null
Phys. Rev. B 78, 024514 (2008)
10.1103/PhysRevB.78.024514
null
cond-mat.supr-con cond-mat.str-el
null
Single crystal of Lu$_2$Fe$_3$Si$_5$ was studied with the tunnel-diode resonator technique in Meissner and mixed states. Temperature dependence of the superfluid density provides strong evidence for the two-gap superconductivity with almost equal contributions from each gap of magnitudes $\Delta_1/k_BT_c=1.86$ and $\Delta_1/k_BT_c=0.54$. In the vortex state, pinning strength shows unusually strong temperature dependence and is non-monotonic with the magnetic field (peak effect). The irreversibility line is sharply defined and is quite distant from the $H_{c2}(T)$, which hints on to enhanced vortex fluctuations in this two-gap system. Altogether our findings provide strong electromagnetic - measurements support to the two-gap superconductivity in Lu$_2$Fe$_3$Si$_5$ previously suggested from specific heat measurements.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 03:28:42 GMT" } ]
2009-02-02T00:00:00
[ [ "Gordon", "R.", "" ], [ "Vannette", "M. D.", "" ], [ "Martin", "C.", "" ], [ "Nakajima", "Y.", "" ], [ "Tamegai", "T.", "" ], [ "Prozorov", "R.", "" ] ]
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801.027
Xueliang Li
Xueliang Li, Fengxia Liu
Partitioning 3-edge-colored complete equi-bipartite graphs by monochromatic trees under a color degree condition
16 pages
null
null
null
math.CO
null
The monochromatic tree partition number of an $r$-edge-colored graph $G$, denoted by $t_r(G)$, is the minimum integer $k$ such that whenever the edges of $G$ are colored with $r$ colors, the vertices of $G$ can be covered by at most $k$ vertex-disjoint monochromatic trees. In general, to determine this number is very difficult. For 2-edge-colored complete multipartite graph, Kaneko, Kano, and Suzuki gave the exact value of $t_2(K(n_1,n_2,...,n_k))$. In this paper, we prove that if $n\geq 3$, and K(n,n) is 3-edge-colored such that every vertex has color degree 3, then $t_3(K(n,n))=3.$
[ { "version": "v1", "created": "Tue, 1 Jan 2008 03:48:33 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 06:19:23 GMT" } ]
2008-01-03T00:00:00
[ [ "Li", "Xueliang", "" ], [ "Liu", "Fengxia", "" ] ]
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801.0271
Damian Swift
Damian C. Swift, Eric N. Loomis, Pedro Peralta, Bassem El-Dasher
Crystal Plasticity for Dynamic Loading at High Pressures and Strains
Revised per reviewer comments
null
null
null
cond-mat.mtrl-sci
null
A crystal plasticity theory was developed for use in simulations of dynamic loading at high pressures and strain rates. At pressures of the order of the bulk modulus, compressions o(100%) may be induced. At strain rates o(10^9)/s or higher, elastic strains may reach o(10%), which may change the orientation of the slip systems significantly with respect to the stress field. Elastic strain rather than stress was used in defining the local state, providing a more direct connection with electronic structure predictions and consistency with the treatment of compression in initial value problems in continuum dynamics. Plastic flow was treated through explicit slip systems, with flow on each system taken to occur by thermally-activated random jumps biased by the resolved stress. Compared with simple Arrhenius rates, the biased random jumps caused significant differences in plastic strain rate as a function of temperature and pressure, and provided a seamless transition to the ultimate theoretical strength of the material. The behavior of the theory was investigated for matter with approximate properties for Ta, demonstrating the importance of the high pressure, high strain rate contributions.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 03:51:30 GMT" }, { "version": "v2", "created": "Thu, 10 Apr 2008 09:19:42 GMT" } ]
2008-04-10T00:00:00
[ [ "Swift", "Damian C.", "" ], [ "Loomis", "Eric N.", "" ], [ "Peralta", "Pedro", "" ], [ "El-Dasher", "Bassem", "" ] ]
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801.0272
Mark Coffey
Mark W. Coffey
Evaluation of a ln tan integral arising in quantum field theory
24 pages, no figures
J.Math.Phys.49:093508,2008
10.1063/1.2981311
null
math-ph math.MP
null
We analytically evaluate a dilogarithmic integral that is prototypical of volumes of ideal tetrahedra in hyperbolic geometry. We additionally obtain new representations of the Clausen function Cl_2 and the Catalan constant G=Cl_2(\pi/2), as well as new relations between sine and Clausen function values.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 03:53:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Coffey", "Mark W.", "" ] ]
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