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801.0073
David Sauzin
David Sauzin (IMCCE)
Initiation to mould calculus through the example of saddle-node singularities
13 pages. A para\^itre dans Rev. Semin. Iberoam. Mat. Singul. Tordesillas
null
null
null
math.DS
null
This article proposes an initiation to \'Ecalle's mould calculus, a powerful combinatorial tool which yields surprisingly explicit formulas for the normalising series attached to an analytic germ of singular vector field. This is illustrated on the case of saddle-node singularities, generated by two-dimensional vector fields which are formally conjugate to Euler's vector field $x^2\frac{\pa}{\pa x}+(x+y)\frac{\pa}{\pa y}$, and for which the formal normalisation proves to be resurgent in $1/x$.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 15:30:50 GMT" }, { "version": "v2", "created": "Sat, 12 Jan 2008 11:45:01 GMT" } ]
2008-01-14T00:00:00
[ [ "Sauzin", "David", "", "IMCCE" ] ]
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801.0074
Antoine Delcroix
Antoine Delcroix (AOC)
A new approach to temperate generalized functions
Prelimary version - 13 pages
null
null
null
math.FA
null
A new approach to the algebra G_{\tau} of temperate nonlinear generalized functions is proposed, in which G_{\tau} is based on the space O_{M} endowed with is natural topology in contrary to previous constructions. Thus, this construction fits perfectly in the general scheme of construction of Colombeau type algebras and reveals better properties of G_{\tau}. This is illustrated by the natural introduction of a regularity theory in G_{\tau}, of the Fourier transform, with the definition of G_{O_{C prime}}, the space of rapidly generalized distributions which is the Fourier image of G_{\tau}.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 15:34:39 GMT" } ]
2008-01-03T00:00:00
[ [ "Delcroix", "Antoine", "", "AOC" ] ]
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801.0075
Neil Dobbs
Neil Dobbs, Bartlomiej Skorulski
Non-existence of absolutely continuous invariant probabilities for exponential maps
4 pages. Similar to the version published in Fundamenta in February 2008
Fundamenta Mathematicae, 198(3):283-287, 2008
null
null
math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that for entire maps of the form $z \mapsto \lambda \exp(z)$ such that the orbit of zero is bounded and such that Lebesgue almost every point is transitive, no absolutely continuous invariant probability measure can exist. This answers a long-standing open problem.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 20:51:44 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 04:25:35 GMT" }, { "version": "v3", "created": "Sun, 6 Jan 2008 16:01:35 GMT" }, { "version": "v4", "created": "Wed, 18 Feb 2009 14:14:38 GMT" } ]
2009-02-18T00:00:00
[ [ "Dobbs", "Neil", "" ], [ "Skorulski", "Bartlomiej", "" ] ]
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801.0076
Tuyen Truong
Tuyen Trung Truong
Degree complexity of a family of birational maps: II. Exceptional cases
23 pages
null
null
null
math.DS math.CV
null
We compute the degree complexity of the family of birational maps considered in \cite{bedford-kim-tuyen-abarenkova-maillard} for all exceptional cases. Some interesting properties of the family are also given.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 16:39:18 GMT" } ]
2008-01-03T00:00:00
[ [ "Truong", "Tuyen Trung", "" ] ]
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801.0077
Igor Rivin
Igor Rivin
Asymptotics of Convex sets in En and Hn
19 pages, submitted for publication in September 2007
null
null
null
math.GT math.MG
null
We study convex sets C of finite (but non-zero volume in Hn and En. We show that the intersection of any such set with the ideal boundary of Hn has Minkowski (and thus Hausdorff) dimension of at most (n-1)/2, and this bound is sharp. In the hyperbolic case we show that for any k <= (n-1)/2 there is a bounded section S of C through any prescribed point p, and we show an upper bound on the radius of the ball centered at p containing such a section. We show similar bounds for sections through the origin of convex body in En, and give asymptotic estimates as 1 << k << n.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 16:39:22 GMT" } ]
2008-01-03T00:00:00
[ [ "Rivin", "Igor", "" ] ]
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801.0078
Christof Wunderlich
M. Johanning, A. Braun, N. Timoney, V. Elman, W. Neuhauser, Chr. Wunderlich
Individual addressing of trapped ions and coupling of motional and spin states using rf radiation
Replaced with published version
Physical Review Letters 102, 073004 (2009)
10.1103/PhysRevLett.102.073004
null
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Individual electrodynamically trapped and laser cooled ions are addressed in frequency space using radio-frequency radiation in the presence of a static magnetic field gradient. In addition, an interaction between motional and spin states induced by an rf field is demonstrated employing rf-optical double resonance spectroscopy. These are two essential experimental steps towards realizing a novel concept for implementing quantum simulations and quantum computing with trapped ions.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 16:49:42 GMT" }, { "version": "v2", "created": "Mon, 23 Feb 2009 15:59:04 GMT" } ]
2009-02-23T00:00:00
[ [ "Johanning", "M.", "" ], [ "Braun", "A.", "" ], [ "Timoney", "N.", "" ], [ "Elman", "V.", "" ], [ "Neuhauser", "W.", "" ], [ "Wunderlich", "Chr.", "" ] ]
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801.0079
Weizhen Wang
Weizhen Wang and Jianan Peng
An Algorithm to Estimate Monotone Normal Means and its Application to Identify the Minimum Effective Dose
null
null
null
null
math.ST stat.TH
null
In the standard setting of one-way ANOVA with normal errors, a new algorithm, called the Step Down Maximum Mean Selection Algorithm (SDMMSA), is proposed to estimate the treatment means under an assumption that the treatment mean is nondecreasing in the factor level. We prove that i) the SDMMSA and the Pooled Adjacent Violator Algorithm (PAVA), a widely used algorithm in many problems, generate the same estimators for normal means, ii) the estimators are the mle's, and iii) the distribution of each of the estimators is stochastically nondecreasing in each of the treatment means. As an application of this stochastic ordering, a sequence of null hypotheses to identify the minimum effective dose (MED) is formulated under the assumption of monotone treatment(dose) means. A step-up testing procedure, which controls the experimentwise error rate in the strong sense, is constructed. When the MED=1, the proposed test is uniformly more powerful than Hsu and Berger's (1999).
[ { "version": "v1", "created": "Sat, 29 Dec 2007 16:57:30 GMT" } ]
2008-01-03T00:00:00
[ [ "Wang", "Weizhen", "" ], [ "Peng", "Jianan", "" ] ]
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801.008
Zhi-Wei Sun
Hao Pan and Zhi-Wei Sun
A new extension of the Erdos-Heilbronn conjecture
null
J. Combin. Theory Ser. A 116(2009), no.8, 1374-1381
null
null
math.NT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let A_1,...,A_n be finite subsets of a field F, and let f(x_1,...,x_n)=x_1^k+...+x_n^k+g(x_1,...,x_n)\in F[x_1,...,x_n] with deg g<k. We obtain a lower bound for the cardinality of {f(x_1,...,x_n): x_1\in A_1,...,x_n\in A_n, and x_i\not=x_j if i\not=j}. The result extends the Erdos-Heilbronn conjecture in a new way.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 18:09:32 GMT" }, { "version": "v2", "created": "Tue, 29 Jan 2008 14:53:49 GMT" }, { "version": "v3", "created": "Sun, 27 Sep 2009 09:11:57 GMT" } ]
2009-09-27T00:00:00
[ [ "Pan", "Hao", "" ], [ "Sun", "Zhi-Wei", "" ] ]
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801.0081
Boris Rubin
Gestur \'Olafsson, Boris Rubin
Invariant Functions on Grassmannians
11 pages
null
null
null
math.FA
null
It is known, that every function on the unit sphere in $\bbr^n$, which is invariant under rotations about some coordinate axis, is completely determined by a function of one variable. Similar results, when invariance of a function reduces dimension of its actual argument, hold for every compact symmetric space and can be obtained in the framework of Lie-theoretic consideration. In the present article, this phenomenon is given precise meaning for functions on the Grassmann manifold $G_{n,i}$ of $i$-dimensional subspaces of $\bbr^n$, which are invariant under orthogonal transformations preserving complementary coordinate subspaces of arbitrary fixed dimension. The corresponding integral formulas are obtained. Our method relies on bi-Stiefel decomposition and does not invoke Lie theory.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 18:17:53 GMT" } ]
2008-01-03T00:00:00
[ [ "Ólafsson", "Gestur", "" ], [ "Rubin", "Boris", "" ] ]
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801.0082
Tamon Stephen
Utz-Uwe Haus, Steffen Klamt, Tamon Stephen
Computing knock out strategies in metabolic networks
12 pages
Journal of Computational Biology. April 1, 2008, 15(3): 259-268
10.1089/cmb.2007.0229
null
q-bio.QM
null
Given a metabolic network in terms of its metabolites and reactions, our goal is to efficiently compute the minimal knock out sets of reactions required to block a given behaviour. We describe an algorithm which improves the computation of these knock out sets when the elementary modes (minimal functional subsystems) of the network are given. We also describe an algorithm which computes both the knock out sets and the elementary modes containing the blocked reactions directly from the description of the network and whose worst-case computational complexity is better than the algorithms currently in use for these problems. Computational results are included.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 19:13:34 GMT" } ]
2008-08-28T00:00:00
[ [ "Haus", "Utz-Uwe", "" ], [ "Klamt", "Steffen", "" ], [ "Stephen", "Tamon", "" ] ]
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801.0083
Amnon Yekutieli
Amnon Yekutieli
Central Extensions of Gerbes
36 pages. Many improvements, Theorem 4.6 corrected
null
null
null
math.AG math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce the notion of central extension of gerbes on a topological space. We then show that there are obstruction classes to lifting objects and isomorphisms in a central extension. We also discuss pronilpotent gerbes. These results are used in a subsequent paper to study twisted deformation quantization on algebraic varieties.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 20:00:32 GMT" }, { "version": "v2", "created": "Thu, 11 Dec 2008 15:28:29 GMT" }, { "version": "v3", "created": "Sat, 22 Aug 2009 07:19:03 GMT" }, { "version": "v4", "created": "Thu, 18 Feb 2010 11:20:59 GMT" } ]
2010-02-18T00:00:00
[ [ "Yekutieli", "Amnon", "" ] ]
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801.0084
Mikhail Cherdantsev
M.I. Cherdantsev
Spectral convergence for high contrast elliptic periodic problems with a defect via homogenization
25 pages, 2 figures, bibliography 22 titles. Paper was revised thoroughly, typos corrected, some comments added. 4 new references are added and one is replaced. 1 new figure is added. Section 4 (proof of Lemma 3.2) is reasonably simplified
null
null
null
math.AP math.SP
null
We consider an eigenvalue problem for a divergence form elliptic operator $A_\epsilon$ with high contrast periodic coefficients with period $\epsilon$ in each coordinate, where $\epsilon$ is a small parameter. The coefficients are perturbed on a bounded domain of `order one' size. The local perturbation of coefficients for such operator could result in emergence of localized waves - eigenfunctions with corresponding eigenvalues lying in the gaps of the Floquet-Bloch spectrum. We prove that, for the so-called double porosity type scaling, the eigenfunctions decay exponentially at infinity, uniformly in $\epsilon$. Then, using the tools of two-scale convergence for high contrast homogenization, we prove the strong two-scale compactness of the eigenfunctions of $A_\epsilon$. This implies that the eigenfunctions converge in the sense of the strong two-scale convergence to the eigenfunctions of a two-scale limit homogenized operator $A_0$, consequently establishing `asymptotic one-to-one correspondence' between the eigenvalues and the eigenfunctions of these two operators. We also prove by direct means the stability of the essential spectrum of the homogenized operator with respect to the local perturbation of its coefficients. That allows us to establish not only the strong two-scale resolvent convergence of $A_\epsilon$ to $A_0$ but also the Hausdorff convergence of the spectra of $A_\epsilon$ to the spectrum of $A_0$, preserving the multiplicity of the isolated eigenvalues.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 20:08:26 GMT" }, { "version": "v2", "created": "Wed, 21 May 2008 13:00:57 GMT" } ]
2009-09-29T00:00:00
[ [ "Cherdantsev", "M. I.", "" ] ]
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801.0085
Mohammad Sal Moslehian
J. Chmielinski, D. Ilisevic, M. S. Moslehian, Gh. Sadeghi
Perturbation of the Wigner equation in inner product C*-modules
12 Pages, To appaer in J. Math. Phys. (won an ISFE medal in the 45th International Symposium on Functional Equations, Poland, 2007)
J. Math. Phys. 49 (2008), no. 3, 033519, 8 pp
10.1063/1.2898486
null
math.OA math.FA
null
Let $\A$ be a $C^*$-algebra and $\B$ be a von Neumann algebra that both act on a Hilbert space $\Ha$. Let $\M$ and $\N$ be inner product modules over $\A$ and $\B$, respectively. Under certain assumptions we show that for each mapping $f\colon{\mathcal M} \to {\mathcal N}$ satisfying $$\||\ip{f(x)}{f(y)}|-|\ip{x}{y}| \|\leq\phi(x,y)\qquad (x,y\in{\mathcal M}),$$ where $\phi$ is a control function, there exists a solution $I\colon{\mathcal M} \to {\mathcal N}$ of the Wigner equation $$|\ip{I(x)}{I(y)}|=|\ip{x}{y}|\qquad (x, y \in {\mathcal M})$$ such that $$\|f(x)-I(x)\|\leq\sqrt{\phi(x,x)} \qquad (x\in {\mathcal M}).$$
[ { "version": "v1", "created": "Sat, 29 Dec 2007 20:33:46 GMT" }, { "version": "v2", "created": "Sun, 2 Mar 2008 19:42:36 GMT" } ]
2021-07-23T00:00:00
[ [ "Chmielinski", "J.", "" ], [ "Ilisevic", "D.", "" ], [ "Moslehian", "M. S.", "" ], [ "Sadeghi", "Gh.", "" ] ]
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801.0086
Sandra Spiroff
Sandra Spiroff, Cameron Wickham
A zero divisor graph determined by equivalence classes of zero divisors
corrected typos and changed content
null
null
null
math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the zero divisor graph determined by equivalence classes of zero divisors of a commutative Noetherian ring R. We demonstrate how to recover information about R from this structure. In particular, we determine how to identify associated primes from the graph.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 20:29:14 GMT" }, { "version": "v2", "created": "Mon, 17 Aug 2009 17:06:44 GMT" } ]
2009-08-17T00:00:00
[ [ "Spiroff", "Sandra", "" ], [ "Wickham", "Cameron", "" ] ]
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801.0087
Jacob Alldredge
J.W. Alldredge (1), Jinho Lee (1 and 2), K. McElroy (3), M. Wang (1), K. Fujita (1), Y. Kohsaka (1 and 4), C. Taylor (1), H. Eisaki (5), S. Uchida (6), P.J. Hirschfeld (7) and J.C. Davis (1 and 8) ((1) LASSP, Department of Physics, Cornell University, (2) School of Physics and Astronomy, University of St. Andrews, (3) Department of Physics, University of Colorado, (4) Magnetic Materials Laboratory, RIKEN, (5) NI-AIST, (6) Department of Physics, University of Tokyo, (7) Department of Physics, University of Florida, (8) 8CMP&MS Department, Brookhaven National Laboratory)
Evolution of the electronic excitation spectrum with strongly diminishing hole-density in superconducting Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}
High resolution version available at: http://people.ccmr.cornell.edu/~jcdavis/files/Alldredge-condmat08010087-highres.pdf
Nature Physics, 4 319-326 (2008)
10.1038/nphys917
null
cond-mat.supr-con
null
A complete knowledge of its excitation spectrum could greatly benefit efforts to understand the unusual form of superconductivity occurring in the lightly hole-doped copper-oxides. Here we use tunnelling spectroscopy to measure the T\to 0 spectrum of electronic excitations N(E) over a wide range of hole-density p in superconducting Bi_{2}Sr_{2}CaCu_{2}O_{8+/delta}. We introduce a parameterization for N(E) based upon an anisotropic energy-gap /Delta (\vec k)=/Delta_{1}(Cos(k_{x})-Cos(k_{y}))/2 plus an effective scattering rate which varies linearly with energy /Gamma_{2}(E) . We demonstrate that this form of N(E) allows successful fitting of differential tunnelling conductance spectra throughout much of the Bi_{2}Sr_{2}CaCu_{2}O_{8+/delta} phase diagram. The resulting average /Delta_{1} values rise with falling p along the familiar trajectory of excitations to the 'pseudogap' energy, while the key scattering rate /Gamma_{2}^{*}=/Gamma_{2}(E=/Delta_{1}) increases from below ~1meV to a value approaching 25meV as the system is underdoped from p~16% to p<10%. Thus, a single, particle-hole symmetric, anisotropic energy-gap, in combination with a strongly energy and doping dependent effective scattering rate, can describe the spectra without recourse to another ordered state. Nevertheless we also observe two distinct and diverging energy scales in the system: the energy-gap maximum /Delta_{1} and a lower energy scale /Delta_{0} separating the spatially homogeneous and heterogeneous electronic structures.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 20:34:35 GMT" } ]
2008-04-04T00:00:00
[ [ "Alldredge", "J. W.", "", "1 and 2" ], [ "Lee", "Jinho", "", "1 and 2" ], [ "McElroy", "K.", "", "1 and 4" ], [ "Wang", "M.", "", "1 and 4" ], [ "Fujita", "K.", "", "1 and 4" ], [ "Kohsaka", "Y.", "", "1 and 4" ], [ "Taylor", "C.", "", "1 and 8" ], [ "Eisaki", "H.", "", "1 and 8" ], [ "Uchida", "S.", "", "1 and 8" ], [ "Hirschfeld", "P. J.", "", "1 and 8" ], [ "Davis", "J. C.", "", "1 and 8" ] ]
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801.0088
Gennadi Sardanashvily
G.Sardanashvily
Supermetrics on supermanifolds
17 pages
Int. J. Geom. Methods Mod. Phys. v5 (2008) 271-286
10.1142/S021988780800276X
null
math-ph math.MP
null
By virtue of the well-known theorem, a structure Lie group K of a principal bundle $P$ is reducible to its closed subgroup H iff there exists a global section of the quotient bundle P/K. In gauge theory, such sections are treated as Higgs fields, exemplified by pseudo-Riemannian metrics on a base manifold of P. Under some conditions, this theorem is extended to principal superbundles in the category of G-supermanifolds. Given a G-supermanifold M and a graded frame superbundle over M with a structure general linear supergroup, a reduction of this structure supergroup to an orthgonal-symplectic supersubgroup is associated to a supermetric on a G-supermanifold M.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 21:12:53 GMT" } ]
2015-05-13T00:00:00
[ [ "Sardanashvily", "G.", "" ] ]
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801.0089
Ulf Ekenberg
U. Ekenberg and D.M. Gvozdic
Analysis of electric-field-induced spin splitting in wide modulation-doped quantum wells
Modified version, now published. 10 pages, 3 figures, 2 tables
Phys. Rev. B 78, 205317 (2008)
10.1103/PhysRevB.78.205317
null
cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the proper inclusion of electric-field-induced spin splittings in the framework of the envelope function approximation. We argue that the Rashba effect should be included in the form of a macroscopic potential as diagonal terms in a multiband approach rather than the commonly used Rashba term dependent on k and electric field. It is pointed out that the expectation value of the electric field in a subband is sometimes not unique because the expectation values can even have opposite signs for the spin-split subband components. Symmetric quantum wells with Dresselhaus terms and the influence of the interfaces on the spin splitting are also discussed. We apply a well established multiband approach to wide modulation-doped InGaSb quantum wells with strong built-in electric fields in the interface regions. We demonstrate an efficient mechanism for switching on and off the Rashba splitting with an electric field being an order of magnitude smaller than the local built-in field that determines the Rashba splitting. The implications of our findings for spintronic devices, in particular the Datta-Das spin transistor and proposed modifications of it, are discussed.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 21:22:42 GMT" }, { "version": "v2", "created": "Tue, 16 Dec 2008 10:09:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Ekenberg", "U.", "" ], [ "Gvozdic", "D. M.", "" ] ]
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801.009
Delfim F. M. Torres
Natalia Martins, Delfim F. M. Torres
Necessary conditions for linear noncooperative N-player delta differential games on time scales
Partially presented at the "Fifth Symposium on Nonlinear Analysis" (SNA 2007), Torun, Poland, September 10-14, 2007
Discuss. Math. Differ. Incl. Control Optim. 31 (1) 2011, 23--37
10.7151/dmdico.1126
null
math.OC math.CA
null
We present necessary conditions for linear noncooperative N-player delta dynamic games on a generic time scale. Necessary conditions for an open-loop Nash-equilibrium and for a memoryless perfect state Nash-equilibrium are proved.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 21:31:39 GMT" } ]
2012-09-18T00:00:00
[ [ "Martins", "Natalia", "" ], [ "Torres", "Delfim F. M.", "" ] ]
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801.0091
Krzysztof Klosin
Tobias Berger, Krzysztof Klosin
A deformation problem for Galois representations over imaginary quadratic fields
22 pages; v2: added section 5.3 (gives a criterion for the univ. def. ring to be a dvr). A slightly modified version of the article published in J. Inst. Math. Jussieu. A related but stronger result is available at the authors' webpages - see e.g. http://www.math.utah.edu/~klosin and use the link "An R=T theorem for imaginary quadratic fields" (published version to appear in Math. Annalen)
T. Berger and K. Klosin, A deformation problem for Galois representations over imaginary quadratic fields, Journal de l'institut de Math. de Jussieu, 8 (2009), no.4, 669-692
null
null
math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove the modularity of minimally ramified ordinary residually reducible p-adic Galois representations of an imaginary quadratic field F under certain assumptions. We first exhibit conditions under which the residual representation is unique up to isomorphism. Then we prove the existence of deformations arising from cuspforms on GL_2(A_F) via the Galois representations constructed by Taylor et al. We establish a sufficient condition (in terms of the non-existence of certain field extensions which in many cases can be reduced to a condition on an L-value) for the universal deformation ring to be a discrete valuation ring and in that case we prove an R=T theorem. We also study reducible deformations and show that no minimal characteristic 0 reducible deformation exists.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 21:37:31 GMT" }, { "version": "v2", "created": "Mon, 14 Jun 2010 13:57:29 GMT" } ]
2010-06-15T00:00:00
[ [ "Berger", "Tobias", "" ], [ "Klosin", "Krzysztof", "" ] ]
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801.0092
Kerry Soileau
Kerry Michael Soileau
Nash bargaining with a nondeterministic threat
Added solution algorithm
null
null
null
cs.GT
null
We consider bargaining problems which involve two participants, with a nonempty closed, bounded convex bargaining set of points in the real plane representing all realizable bargains. We also assume that there is no definite threat or disagreement point which will provide the default bargain if the players cannot agree on some point in the bargaining set. However, there is a nondeterministic threat: if the players fail to agree on a bargain, one of them will be chosen at random with equal probability, and that chosen player will select any realizable bargain as the solution, subject to a reasonable restriction.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 21:39:31 GMT" }, { "version": "v2", "created": "Fri, 4 Jan 2008 00:58:21 GMT" } ]
2008-01-04T00:00:00
[ [ "Soileau", "Kerry Michael", "" ] ]
[ -0.045742467, -0.0595134757, 0.0942675322, 0.072006762, 0.029785132, -0.0478720032, 0.0330788158, 0.0316875204, -0.0265766289, 0.0291888621, 0.1004573852, -0.1259550452, -0.0919392332, 0.0678612664, 0.0281666834, 0.0141046373, 0.0453733467, 0.0059130159, 0.0193645954, 0.0121951513, 0.0568160601, 0.0792755857, 0.0033096562, -0.0009432076, 0.0210398305, 0.0141117359, 0.0260513425, -0.0115704872, 0.0287061669, -0.0655329674, 0.0244186968, -0.0701327696, -0.0812063664, -0.0898948759, 0.0126139605, 0.0802409723, -0.0077444185, 0.1037510708, -0.0062785866, -0.022771854, -0.082342118, -0.030381402, -0.1086915955, 0.0870554969, 0.0529544987, 0.0526705608, -0.0277265795, -0.0496608168, 0.0358046256, 0.027343262, -0.1160172075, 0.022033615, 0.0467078574, -0.0421364494, -0.0707006454, 0.0171924662, -0.0632046759, 0.0020958199, 0.0194213819, -0.0107967556, -0.1104520112, -0.1074422672, -0.0494336635, 0.134700343, -0.0214941315, -0.1219799146, -0.0373662859, 0.0310060661, 0.0090150423, 0.1282265484, -0.0712117329, -0.0199608654, 0.0250433609, 0.0584912971, -0.0285216067, 0.0049192319, 0.0645107925, 0.0298703127, 0.0658169091, 0.0344133265, -0.0385304317, 0.017930707, 0.069167383, -0.0529261082, -0.0834210813, -0.0877369493, -0.0839321762, -0.0193078071, -0.0781398341, -0.0447202884, -0.1601412296, -0.0369687714, 0.0558790639, 0.0564469434, 0.0545161627, -0.0360885635, 0.0660440549, 0.0037692816, 0.0400353074, -0.0451178029, -0.0702463463, -0.0404612124, 0.0494904518, 0.0430166572, 0.0921095982, 0.0227434617, -0.014438265, 0.1319745332, -0.0623528585, -0.0111374818, -0.1739974171, -0.0897813067, 0.013139247, 0.002956508, -0.1371989995, -0.1074990556, -0.1194812506, -0.018839309, 0.0623528585, -0.0469917953, -0.014580234, -0.0560210347, 0.0243477132, -0.0035155115, -0.0617281944, 0.0248871949, 0.0718931854, -0.0854654387, 0.0794459507, -0.0069068, -0.0117266532, -0.0220620092, -0.0557087027, 0.0532100461, -0.1401519626, 0.0631478876, -0.0680884123, -0.0367132276, 0.1192541048, -0.0630343109, -0.0044294382, 0.0672366023, -0.0016228851, 0.0383316763, -0.1072719023, 0.1127235219, 0.0190522633, 0.0597974136, -0.0303530078, 0.0583777241, -0.0216219053, -0.0518187471, 0.0816606656, 0.1057954282, -0.0122235455, -0.1716123372, -0.0665551499, -0.0408303328, -0.0444647446, 0.0298987068, 0.1014795601, 0.0600813515, -0.0092421928, -0.0845568404, 0.0763226226, 0.0590591766, 0.0103495521, 0.0912577808, -0.0154462457, 0.0420512669, -0.0067612818, 0.021266982, -0.0620689206, 0.0502854809, -0.0172492545, -0.0129333911, 0.0592295378, -0.0842161104, -0.0061224205, -0.041937694, -0.0490077585, 0.0848407745, 0.0120034935, -0.1163011417, -0.0419944823, -0.0130895572, -0.0283796377, -0.0509385392, -0.0722339153, 0.0074959723, -0.0224879161, -0.016113501, 0.0485250615, 0.0275988076, 0.0520175025, -0.1206170097, 0.0315739438, 0.1011388376, 0.0340726003, 0.0470201895, 0.0275988076, -0.1006845385, 0.0633750409, 0.0728017911, 0.0259945542, -0.009724888, -0.0137000252, 0.0567024872, -0.0122661367, 0.0633182526, 0.0002287035, -0.0498879664, 0.0085678399, 0.0112297609, -0.047247339, -0.0035208354, -0.002979578, 0.0742782727, -0.0920528099, 0.1407198459, -0.0594566874, 0.0910306349, -0.0416537561, 0.0700759813, 0.0646243691, 0.0038012245, 0.0909738466, -0.0670662373, 0.036770016, -0.0850679278, 0.0183140226, -0.0625232235, -0.0337034799, -0.0777991042, 0.0300974641, -0.0136858281, 0.0225872956, -0.09086027, -0.100854896, -0.0260655396, -0.0310628545, -0.0872258544, -0.0538347103, -0.0363725014, 0.010335356, -0.0163264554, 0.0069458415, -0.0297567379, -0.1094298363, -0.0097958725, 0.0212385878, 0.0515348092, 0.0483830944, -0.0363157131, -0.0703031346, -0.0624664351 ]
801.0093
Jiren Liu
Jiren Liu and Lizhi Fang (UA)
The Thermal State of the Intergalactic Medium at Redshift $5<z<6$
This paper has been withdrawn
null
null
null
astro-ph
null
This paper has been withdrawn
[ { "version": "v1", "created": "Sat, 29 Dec 2007 22:02:17 GMT" }, { "version": "v2", "created": "Thu, 6 Mar 2008 05:40:37 GMT" } ]
2008-03-06T00:00:00
[ [ "Liu", "Jiren", "", "UA" ], [ "Fang", "Lizhi", "", "UA" ] ]
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801.0094
Eric Chi
Eric Chi and Stephen A. Lyon and Margaret Martonosi
An analytical error model for quantum computer simulation
null
null
10.1103/PhysRevA.77.052315
null
quant-ph
null
Quantum computers (QCs) must implement quantum error correcting codes (QECCs) to protect their logical qubits from errors, and modeling the effectiveness of QECCs on QCs is an important problem for evaluating the QC architecture. The previously developed Monte Carlo (MC) error models may take days or weeks of execution to produce an accurate result due to their random sampling approach. We present an alternative analytical error model that generates, over the course of executing the quantum program, a probability tree of the QC's error states. By calculating the fidelity of the quantum program directly, this error model has the potential for enormous speedups over the MC model when applied to small yet useful problem sizes. We observe a speedup on the order of 1,000X when accuracy is required, and we evaluate the scaling properties of this new analytical error model.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 22:06:30 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 01:42:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Chi", "Eric", "" ], [ "Lyon", "Stephen A.", "" ], [ "Martonosi", "Margaret", "" ] ]
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801.0095
Stanislaw Tatur
Stanislaw Tatur and Jan Bartelski
Mass matrices for quarks and leptons in triangular form
Latex, 20 pages, no figures, extended and modified version to be published in Acta Phys. Pol. B
Acta Phys.Polon.B39:2903-2920,2008
null
null
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We assume that all quark and lepton mass matrices have upper triangular form. Using all available experimental data on quark and lepton masses and mixing angles we make a fit in which we determine mass matrices elements. There are too many free parameters and our solutions are not uniqe. We look for solutions with small non diagonal mixing matrix elements. In order to reduce the number of free parameters we assume that the matrix element $(M)_{13}$ vanishes in \underline{all} mass matrices. Such universal assumption was drown from considering different numerical solutions. The lepton sector, due to large mixing angles and very small errors for charged lepton masses, is more restrictive then quark sector. We present the solution in this case. The absolute values of neutrino masses are not fixed. The another possibility of reducing number of free parameters was considered by us before. With the additional assumption motivated by SU(5) symmetry which connects mixing in right handed down quarks with left handed charged leptons we get a solution in which observed Cabibbo-Kobayashi-Maskawa mixing for quarks comes mainly from non diagonal terms in up quark mass matrix. From the fit we get also predictions for neutrino masses.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 22:09:54 GMT" }, { "version": "v2", "created": "Thu, 28 Feb 2008 16:18:51 GMT" }, { "version": "v3", "created": "Thu, 4 Sep 2008 14:10:16 GMT" } ]
2008-12-19T00:00:00
[ [ "Tatur", "Stanislaw", "" ], [ "Bartelski", "Jan", "" ] ]
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801.0096
Mark Wilde
Mark M. Wilde
Can Classical Noise Enhance Quantum Transmission?
11 pages, 3 figures, replaced with published version that includes new section on imperfect entanglement and references to J. J. Ting's earlier work
Journal of Physics A: Mathematical and Theoretical 42, 325301 (2009)
10.1088/1751-8113/42/32/325301
HITP-08-01-01
quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A modified quantum teleportation protocol broadens the scope of the classical forbidden-interval theorems for stochastic resonance. The fidelity measures performance of quantum communication. The sender encodes the two classical bits for quantum teleportation as weak bipolar subthreshold signals and sends them over a noisy classical channel. Two forbidden-interval theorems provide a necessary and sufficient condition for the occurrence of the nonmonotone stochastic resonance effect in the fidelity of quantum teleportation. The condition is that the noise mean must fall outside a forbidden interval related to the detection threshold and signal value. An optimal amount of classical noise benefits quantum communication when the sender transmits weak signals, the receiver detects with a high threshold, and the noise mean lies outside the forbidden interval. Theorems and simulations demonstrate that both finite-variance and infinite-variance noise benefit the fidelity of quantum teleportation.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 22:20:15 GMT" }, { "version": "v2", "created": "Thu, 23 Jul 2009 23:19:40 GMT" } ]
2009-07-24T00:00:00
[ [ "Wilde", "Mark M.", "" ] ]
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801.0097
Bozzini Benedetto
Benedetto Bozzini, Lucia DUrzo, Claudio Mele, Vincenzo Romanello
A SERS Investigation of Cyanide Adsorption and Reactivity during the Electrodeposition of Gold, Silver and Copper from Aqueous Cyanocomplexes Solutions
null
null
null
null
cond-mat.mtrl-sci
null
In this paper we report on the reactivity of adsorbed cyanide deriving from ligand release during metal electrodeposition from cyanocomplex solutions of Au(I), Au(III), Ag(I) and Cu(I) in H2O and D2O. When CN is adsorbed at cathodic potentials in excess of the HER threshold, metal-dependent reactivity can be detected by SERS. Finite surface coverages with adsorbed CN at such cathodic potentials can be obtained only if CN is delivered directly to the cathode surface as by decomplexing of the cyanocomplexes of the metals undergoing cathodic reduction. In Au(I) and Au(III) baths, Au-CN reacts with Au-H and is hydrogenated to adsorbed CH2=NH and CH3-NH2. In Ag(I) baths, Ag-CN reacts with Ag-H giving rise to polycyanogens. No reactivity of Cu-CN was found, under otherwise identical conditions. Our conclusions are supported also by dedicated DFT molecular computations.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 22:36:25 GMT" } ]
2008-01-03T00:00:00
[ [ "Bozzini", "Benedetto", "" ], [ "DUrzo", "Lucia", "" ], [ "Mele", "Claudio", "" ], [ "Romanello", "Vincenzo", "" ] ]
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801.0098
Bozzini Benedetto
Lucia DUrzo, Benedetto Bozzini
An SERS study of the galvanostatic sequence employed for the electrochemical deposition of Copper in the fabrication of Interconnects
null
null
null
null
cond-mat.mtrl-sci
null
This paper reports the first study carried out by surface-enhanced Raman spectroscopy (SERS) during the galvanostatic electrodeposition (ECD) of copper from an acidic sulphate solution, in the presence of polyethylene glycol (PEG), bis-(3-sulfopropyl)-disulfide Na salt (SPS), benzyl-phenyl modified polyethyleneimine (BPPEI) and chloride ions. The analysis of SERS spectra recorded during electrodeposition allowed to get an insight into the complex interfacial behaviour of the organic blend, in terms of co-adsorption and reactivity. At open-circuit (OC), the additives co-adsorb on the copper cathode. Upon increasing the cathodic polarization, progressive SPS-scavenging action of PEG was observed. BPPEI is adsorbed in the entire process window and cathodic reaction products of PEG were identified. The joint action of the organic additives yields a continuous deposit with crystallites of submicron dimensions, as revealed by Scanning Electron Microscopy (SEM).
[ { "version": "v1", "created": "Sat, 29 Dec 2007 22:43:44 GMT" } ]
2008-01-03T00:00:00
[ [ "DUrzo", "Lucia", "" ], [ "Bozzini", "Benedetto", "" ] ]
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801.0099
Anwar Shiekh Dr.
A.Y. Shiekh
Reply to `On a recent proposal of faster than light quantum communication'
4 pages, 1 figure
Electr. Jour. of Theor. Phys., 18, 109, 2008
null
null
physics.gen-ph quant-ph
null
In a recent paper the author proposed the possibility of an experiment to perform faster-than-light communication via the collapse of the quantum wave-function. This was analyzed by Bassi and Ghirardi, and it is believed that this analysis itself merits a detailed examination.
[ { "version": "v1", "created": "Sat, 29 Dec 2007 22:45:10 GMT" } ]
2008-06-28T00:00:00
[ [ "Shiekh", "A. Y.", "" ] ]
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801.01
Peter Forrester
Peter J. Forrester and Taro Nagao
Determinantal Correlations for Classical Projection Processes
26 pages
J. Stat. Mech., 2011, P08011 (2011)
null
null
math-ph math.MP
null
Recent applications in queuing theory and statistical mechanics have isolated the process formed by the eigenvalues of successive minors of the GUE. Analogous eigenvalue processes, formed in general from the eigenvalues of nested sequences of matrices resulting from random corank 1 projections of classical random matrix ensembles, are identified for the LUE and JUE. The correlations for all these processes can be computed in a unified way. The resulting expressions can then be analyzed in various scaling limits. At the soft edge, with the rank of the minors differing by an amount proportional to $N^{2/3}$, the scaled correlations coincide with those known from the soft edge scaling of the Dyson Brownian motion model.
[ { "version": "v1", "created": "Tue, 1 Jan 2008 02:33:51 GMT" } ]
2015-06-16T00:00:00
[ [ "Forrester", "Peter J.", "" ], [ "Nagao", "Taro", "" ] ]
[ -0.0765413865, -0.0581909418, 0.0482578836, 0.0076257195, 0.0015342786, 0.0512892231, 0.0183504447, -0.0150755132, -0.1629346311, 0.0750798434, 0.0168618392, -0.000898238, -0.0420328043, 0.004063216, -0.0008043544, -0.058786381, 0.0303946175, 0.0304758139, 0.0359430537, 0.0139793586, -0.0111780735, -0.0692336857, 0.0858519375, -0.019189477, 0.0061371145, -0.0510185696, 0.0640912279, 0.0538063198, 0.0721567646, 0.0220719595, 0.035834793, -0.0213141236, -0.057216581, -0.0482308157, -0.118763648, 0.0784359723, -0.0283647012, 0.0860684589, -0.0897493735, 0.0887208879, 0.0313960426, 0.0109412502, -0.0404359363, 0.045145344, 0.0217201076, 0.0158062838, -0.0165911838, -0.0849317089, -0.029907437, 0.0457407869, -0.048717998, 0.0551054664, 0.0448746867, -0.0334800892, -0.0672308356, 0.0171324946, 0.050098341, 0.0794644654, 0.0450912118, -0.1377095431, 0.1076126397, -0.1268833131, 0.0017440366, 0.0240071453, -0.0734017789, 0.0076866173, -0.0830912516, 0.0685299784, 0.0673932284, 0.0434131473, -0.1078291684, -0.0345085822, 0.0876382664, -0.0244807936, 0.0154544311, -0.0249950383, 0.0063502556, 0.0811966583, -0.0521282554, 0.0693419501, 0.0669060498, -0.0016772185, 0.0404088721, 0.0560798272, 0.028716553, -0.0808177441, 0.0306111407, 0.0487991944, -0.0685841143, 0.0291496012, -0.001045407, 0.038595479, -0.0642536283, 0.0503689945, 0.0523447804, 0.037431661, 0.1123761758, -0.0530214198, 0.0630086064, 0.011489328, -0.1007379889, -0.0272956118, -0.001267852, -0.0949459597, 0.1091283113, 0.0079572732, -0.0076460191, -0.0472564586, -0.0313689783, 0.0494217016, 0.0163881928, 0.0073956624, -0.1001966819, 0.0610598885, 0.0813049227, -0.0516140126, -0.0190676823, -0.0555926487, -0.0657151639, 0.0161987338, -0.0224238113, -0.0717237145, 0.0294473227, 0.007422728, 0.004550396, -0.0042154598, 0.0253198259, -0.0934844241, -0.0404359363, -0.0365655646, 0.1226610914, 0.0162122659, -0.0191759448, -0.0888291448, -0.1099402755, 0.0019504115, 0.1220115125, -0.0384601504, 0.0857978016, 0.0161987338, 0.0554031879, 0.0560798272, 0.0824416801, 0.0367008895, -0.0005988254, 0.1190884337, -0.0569459237, 0.0685841143, 0.0382165611, 0.006536331, 0.0760000721, -0.0354829393, 0.0004431985, 0.0143447435, -0.0141958827, -0.0873134732, 0.0258611366, 0.0015511946, 0.0598148741, -0.1106981114, 0.0397863649, 0.0778405294, -0.0237229578, -0.0305028781, 0.0983562246, 0.009317317, -0.1516753584, 0.0129305683, -0.0226944666, -0.0591111705, -0.0095541403, -0.0605185777, -0.0458490476, -0.0308005996, 0.1246098056, 0.0434943438, -0.1352194995, -0.0979231745, 0.0529131591, -0.0728604719, -0.0114013646, 0.0092158206, 0.0364843681, -0.0016814475, -0.0463362262, 0.1353277713, 0.0387578718, -0.008708342, -0.0070776423, -0.0183098465, 0.0165099874, 0.0941339955, 0.0537792556, 0.1962793916, 0.0335342214, -0.0781653225, 0.0330470428, 0.0790314153, -0.0159957428, 0.0019419534, -0.0413020365, 0.012673446, 0.106692411, -0.0095203081, -0.0383248255, 0.0072400356, 0.1239602342, -0.0763789937, -0.0807636157, -0.0486638658, 0.072265029, -0.0446852297, -0.0054164939, 0.0816297084, -0.0526425019, -0.014263547, -0.1474531293, 0.1102109328, 0.0523177162, 0.0747009292, -0.0606268421, 0.120387584, -0.0137222353, 0.0942422599, 0.0040868986, 0.0349145643, 0.0905613452, -0.1453961581, 0.0313148461, -0.0774616152, -0.0530214198, -0.0704245716, -0.1023077965, -0.0751339793, 0.0119968066, -0.0128426049, -0.0768661723, -0.0748091936, 0.0697750002, -0.0001038746, 0.0182963144, 0.0143447435, -0.0051593711, 0.0235334989, 0.0459843762, 0.0966240242, -0.1010086462, 0.0815755799, 0.0046755746, 0.0339131393, -0.0305299442, 0.0227079988, 0.0656068996, -0.0012737727, 0.0344815142, 0.0173896179 ]
801.0101
Siegfried Graser
S. Graser, P.J. Hirschfeld, D.J. Scalapino
Local quasiparticle lifetimes in a d-wave superconductor
18 pages, 15 figures
Phys. Rev. B 77, 184504 (2008)
10.1103/PhysRevB.77.184504
null
cond-mat.supr-con
null
Scanning tunnelling spectroscopy (STS) measurements find that the surface of Bi-2212 is characterized by nanoscale sized regions, "gap patches," which have different magnitudes for the d-wave energy gap. Recent studies have shown that the tunnelling conductance can be fit using a BCS-type density of states for a d-wave superconductor with a local quasiparticle scattering rate. The fit is made with a scattering rate which varies linearly with energy and has a slope that is positively correlated with the local value of the gap. We revisit a model of quasiparticle scattering by impurities and spin fluctuations which was previously used to describe the lifetimes of nodal quasiparticles measured by angle-resolved photoemission (ARPES). We argue that the broadening of the local density of states is in general determined by the imaginary part of the self-energy of the system averaged over a small region. The size of this region is set by a mean free path which depends upon the energy. At low energies, this region is found to be significantly larger than a gap "patch", so that the density of states measured by STS is homogeneous in this energy range. At higher energies where the mean free path is comparable with the patch size, the density of states is inhomogeneous. We show that a local self-energy in the impurity-plus-spin fluctuation model, while not strictly linear, yields a local density of states (LDOS) nearly identical to the full theory, and argue that it is consistent with the STS data as well as the phenomenological linear scattering rate extracted from experiment. We also explore the qualitative consequences of this phenomenology for the spectral widths observed in ARPES and predict the existence of Fermi arcs in the superconducting state.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 03:07:38 GMT" } ]
2008-05-30T00:00:00
[ [ "Graser", "S.", "" ], [ "Hirschfeld", "P. J.", "" ], [ "Scalapino", "D. J.", "" ] ]
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801.0102
Michael Baer
Michael B. Baer
Reserved-Length Prefix Coding
5 pages, submitted to ISIT 2008
null
null
null
cs.IT cs.DS math.IT
null
Huffman coding finds an optimal prefix code for a given probability mass function. Consider situations in which one wishes to find an optimal code with the restriction that all codewords have lengths that lie in a user-specified set of lengths (or, equivalently, no codewords have lengths that lie in a complementary set). This paper introduces a polynomial-time dynamic programming algorithm that finds optimal codes for this reserved-length prefix coding problem. This has applications to quickly encoding and decoding lossless codes. In addition, one modification of the approach solves any quasiarithmetic prefix coding problem, while another finds optimal codes restricted to the set of codes with g codeword lengths for user-specified g (e.g., g=2).
[ { "version": "v1", "created": "Sun, 30 Dec 2007 00:14:24 GMT" } ]
2008-01-03T00:00:00
[ [ "Baer", "Michael B.", "" ] ]
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801.0103
Fuquan Fang
Fuquan Fang, Jianwen man, Zhenlei Zhang
Complete gradient shrinking Ricci solitons have finite topological type
null
null
null
null
math.DG math.GT
null
We show that a complete Riemannian manifold has finite topological type (i.e., homeomorphic to the interior of a compact manifold with boundary), provided its Bakry-\'{E}mery Ricci tensor has a positive lower bound, and either of the following conditions: (i) the Ricci curvature is bounded from above; (ii) the Ricci curvature is bounded from below and injectivity radius is bounded away from zero. Moreover, a complete shrinking Ricci soliton has finite topological type if its scalar curvature is bounded.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 03:55:17 GMT" } ]
2008-01-03T00:00:00
[ [ "Fang", "Fuquan", "" ], [ "man", "Jianwen", "" ], [ "Zhang", "Zhenlei", "" ] ]
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801.0104
Luis Dieulefait
Luis Dieulefait, Xavier Taixes i Ventosa
Congruences between modular forms and lowering the level mod l^n
minor changes
null
null
null
math.NT
null
In this article we study the behavior of inertia groups for modular Galois mod l^n representations and in some cases we give a generalization of Ribet's lowering the level result
[ { "version": "v1", "created": "Sun, 30 Dec 2007 02:36:14 GMT" }, { "version": "v2", "created": "Sat, 12 Apr 2008 21:58:59 GMT" } ]
2008-04-13T00:00:00
[ [ "Dieulefait", "Luis", "" ], [ "Ventosa", "Xavier Taixes i", "" ] ]
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801.0105
Zhiyong Fan
Zhiyong Fan, Johnny C. Ho, Zachery A. Jacobson, Roie Yerushalmi, Robert L. Alley, Haleh Razavi, Ali Javey
Wafer-Scale Assembly of Semiconductor Nanowire Arrays by Contact Printing
14 pages,4 figures
Nano Letters, Vol. 8, Iss. 1, 2008
10.1021/nl071626r
null
cond-mat.mtrl-sci
null
Controlled and uniform assembly of "bottom-up" nanowire (NW) materials with high scalability has been one of the significant bottleneck challenges facing the potential integration of nanowires for both nano and macro electronic circuit applications. Many efforts have focused on tackling this challenge, and while significant progress has been made, still most presented approaches lack either the desired controllability in the positioning of nanowires or the needed uniformity over large scales. Here, we demonstrate wafer-scale assembly of highly ordered, dense, and regular arrays of NWs with high uniformity and reproducibility through a simple contact printing process. We demonstrate contact printing as a versatile strategy for direct transfer and controlled positioning of various NW materials into complex structural configurations on substrates. The assembled NW pitch is shown to be readily modulated through the surface chemical treatment of the receiver substrate, with the highest density approaching ~8 NW/um, ~95% directional alignment and wafer-scale uniformity. Furthermore, we demonstrate that our printing approach enables large-scale integration of NW arrays for various device structures on both Si and plastic substrates, with a controlled semiconductor channel width, and therefore ON current, ranging from a single NW (~10 nm) and up to ~250 um, consisting of a parallel array of over 1,250 NWs.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 02:37:26 GMT" } ]
2008-01-03T00:00:00
[ [ "Fan", "Zhiyong", "" ], [ "Ho", "Johnny C.", "" ], [ "Jacobson", "Zachery A.", "" ], [ "Yerushalmi", "Roie", "" ], [ "Alley", "Robert L.", "" ], [ "Razavi", "Haleh", "" ], [ "Javey", "Ali", "" ] ]
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801.0106
Hitoshi Nishino
Hitoshi Nishino and Subhash Rajpoot
Dilaton and Second-Rank Tensor Fields as Supersymmetric Compensators
15 pages, no figures
Phys.Rev.D76:065004,2007
10.1103/PhysRevD.76.065004
CSULB-PA-06-6
hep-th
null
We formulate a supersymmetric theory in which both a dilaton and a second-rank tensor play roles of compensators. The basic off-shell multiplets are a linear multiplet (B_{\mu\nu}, \chi, \phi) and a vector multiplet (A_\mu, \l; C_{\mu\nu\rho}), where \phi and B_{\m\n} are respectively a dilaton and a second-rank tensor. The third-rank tensor C_{\mu\nu\rho} in the vector multiplet is 'dual' to the conventional D-field with 0 on-shell or 1 off-shell degree of freedom. The dilaton \phi is absorbed into one longitudinal component of A_\mu, making it massive. Initially, B_{\mu\nu} has 1 on-shell or 3 off-shell degrees of freedom, but it is absorbed into the longitudinal components of C_{\mu\nu\rho}. Eventually, C_{\mu\nu\rho} with 0 on-shell or 1 off-shell degree of freedom acquires in total 1 on-shell or 4 off-shell degrees of freedom, turning into a propagating massive field. These basic multiplets are also coupled to chiral multiplets and a supersymmetric Dirac-Born-Infeld action. Some of these results are also reformulated in superspace. The proposed mechanism may well provide a solution to the long-standing puzzle of massless dilatons and second-rank tensors in supersymmetric models inspired by string theory.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 03:05:14 GMT" } ]
2008-11-26T00:00:00
[ [ "Nishino", "Hitoshi", "" ], [ "Rajpoot", "Subhash", "" ] ]
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801.0107
Tulasi Nandan Parashar
T. N. Parashar, M. A. Shay, P. A. Cassak, W. H. Matthaeus
Kinetic dissipation and anisotropic heating in a turbulent collisionless plasma
4 pages, 4 figures. Submitted to PRL
null
10.1063/1.3094062
null
physics.plasm-ph physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The kinetic evolution of the Orszag-Tang vortex is studied using collisionless hybrid simulations. In the magnetohydrodynamic regime this vortex leads rapidly to broadband turbulence. Significant differences from MHD arise at small scales, where the fluid scale energy dissipates into heat almost exclusively through the magnetic field because the protons are decoupled from the magnetic field. Although cyclotron resonance is absent, the protons heat preferentially in the plane perpendicular to the mean field, as in the corona and solar wind. Effective transport coefficients are calculated.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 04:10:20 GMT" }, { "version": "v2", "created": "Fri, 20 Jun 2008 17:33:25 GMT" } ]
2022-06-08T00:00:00
[ [ "Parashar", "T. N.", "" ], [ "Shay", "M. A.", "" ], [ "Cassak", "P. A.", "" ], [ "Matthaeus", "W. H.", "" ] ]
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801.0108
Tao Zhou
Shi-Mei Jiang, Shi-Min Cai, Tao Zhou, and Pei-Ling Zhou
Note on two phase phenomena in financial markets
8 pages and 5 figures
Chin. Phys. Lett. 25 (2008) 2319
10.1088/0256-307X/25/6/108
null
q-fin.ST physics.data-an physics.soc-ph
null
The two phase behavior in financial markets actually means the bifurcation phenomenon, which represents the change of the conditional probability from an unimodal to a bimodal distribution. In this paper, the bifurcation phenomenon in Hang-Seng index is carefully investigated. It is observed that the bifurcation phenomenon in financial index is not universal, but specific under certain conditions. The phenomenon just emerges when the power-law exponent of absolute increment distribution is between 1 and 2 with appropriate period. Simulations on a randomly generated time series suggest the bifurcation phenomenon itself is subject to the statistics of absolute increment, thus it may not be able to reflect the essential financial behaviors. However, even under the same distribution of absolute increment, the range where bifurcation phenomenon occurs is far different from real market to artificial data, which may reflect certain market information.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 07:33:05 GMT" } ]
2009-11-13T00:00:00
[ [ "Jiang", "Shi-Mei", "" ], [ "Cai", "Shi-Min", "" ], [ "Zhou", "Tao", "" ], [ "Zhou", "Pei-Ling", "" ] ]
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801.0109
Dietrich Stauffer
Soeren Wichmann, Dietrich Stauffer, Christian Schulze, F.Welington S. Lima, Eric W Holman
Meaning and Form in a Language Computer Simulation
13 pages including many figures. Revised version with larger systems and one more author Welington Lima; 15 pages
null
null
null
physics.soc-ph
null
Thousands of different forms (words) are associated with thousands of different meanings (concepts) in a language computer model. Reasonable agreement with reality is found for the number of languages in a family and the Hamming distances between languages.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 08:08:56 GMT" }, { "version": "v2", "created": "Mon, 19 May 2008 13:59:34 GMT" } ]
2008-05-19T00:00:00
[ [ "Wichmann", "Soeren", "" ], [ "Stauffer", "Dietrich", "" ], [ "Schulze", "Christian", "" ], [ "Lima", "F. Welington S.", "" ], [ "Holman", "Eric W", "" ] ]
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801.011
Kohsuke Sumiyoshi
Kohsuke Sumiyoshi (Numazu College of Technology, Japan) and Gerd Roepke (University of Rostock, Germany)
Appearance of Light Clusters in Post-bounce Evolution of Core-Collapse Supernovae
5 pages, 2 figures, accepted for publication in Phys. Rev. C, improved discussions and references
Phys.Rev.C77:055804,2008
10.1103/PhysRevC.77.055804
null
astro-ph nucl-th
null
We explore the abundance of light clusters in core-collapse supernovae at post-bounce stage in a quantum statistical approach. Adopting the profile of a supernova core from detailed numerical simulations, we study the distribution of light bound clusters up to alpha particles (A=2-4) as well as heavy nuclei (A > 4) in dense matter at finite temperature. Within the frame of a cluster-mean field approach, the abundances of light clusters are evaluated accounting for self-energy, Pauli blocking and effects of continuum correlations. We find that deuterons and tritons, in addition to 3He and 4He, appear abundantly in a wide region from the surface of the proto-neutron star to the position of the shock wave. The appearance of light clusters may modify the neutrino emission in the cooling region and the neutrino absorption in the heating region, and, thereby, influence the supernova mechanism.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 08:14:26 GMT" }, { "version": "v2", "created": "Tue, 29 Apr 2008 03:29:37 GMT" } ]
2008-11-26T00:00:00
[ [ "Sumiyoshi", "Kohsuke", "", "Numazu College of Technology, Japan" ], [ "Roepke", "Gerd", "", "University of Rostock, Germany" ] ]
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801.0111
Yasuyuki Nakajima
Y. Nakajima, T. Nakagawa, T. Tamegai, and H. Harima
Specific heat evidence for two-gap superconductivity in ternary-iron silicide Lu$_{2}$Fe$_{3}$Si$_{5}$
5 pages, 5 figures
null
10.1103/PhysRevLett.100.157001
null
cond-mat.supr-con
null
We report low-temperature specific heat studies on single-crystalline ternary-iron silicide superconductor Lu$_{2}$Fe$_{3}$Si$_{5}$ with$T_c$ = 6.1 K down to $\sim T_c/20$. We confirm a reduced normalized jump in specific heat at $T_c$, and find that the specific heat divided by temperature $C/T$ shows sudden drop at $\sim T_c/5$ and goes to zero with further decreasing temperature. These results indicate the presence of two distinct superconducting gaps in Lu$_{2}$Fe$_{3}$Si$_{5}$, similar to a typical two-gap superconductor MgB$_{2}$. We also report Hall coefficients, band structure calculation, and the anisotropy of upper critical fields for Lu$_{2}$Fe$_{3}$Si$_{5}$, which support the anisotropic multiband nature and reinforce the existence of two superconducting gaps in Lu$_{2}$Fe$_{3}$Si$_{5}$.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 08:33:06 GMT" } ]
2009-11-13T00:00:00
[ [ "Nakajima", "Y.", "" ], [ "Nakagawa", "T.", "" ], [ "Tamegai", "T.", "" ], [ "Harima", "H.", "" ] ]
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801.0112
Eric Blackman
Eric G. Blackman, George B. Field
Dimensionless Measures of Turbulent Magnetohydrodynamic Dissipation Rates
14 pages (including 2 figs), accepted by MNRAS
null
10.1111/j.1365-2966.2008.13108.x
null
astro-ph physics.plasm-ph
null
The magnetic Reynolds number R_M, is defined as the product of a characteristic scale and associated flow speed divided by the microphysical magnetic diffusivity. For laminar flows, R_M also approximates the ratio of advective to dissipative terms in the total magnetic energy equation, but for turbulent flows this latter ratio depends on the energy spectra and approaches unity in a steady state. To generalize for flows of arbitrary spectra we define an effective magnetic dissipation number, R_{M,e}, as the ratio of the advection to microphysical dissipation terms in the total magnetic energy equation, incorporating the full spectrum of scales, arbitrary magnetic Prandtl numbers, and distinct pairs of inner and outer scales for magnetic and kinetic spectra. As expected, for a substantial parameter range R_{M,e}\sim {O}(1) << R_M. We also distinguish R_{M,e} from {\tilde R}_{M,e} where the latter is an effective magnetic Reynolds number for the mean magnetic field equation when a turbulent diffusivity is explicitly imposed as a closure. That R_{M,e} and {\tilde R}_{M,e} approach unity even if R_M>>1 highlights that, just as in hydrodynamic turbulence,energy dissipation of large scale structures in turbulent flows via a cascade can be much faster than the dissipation of large scale structures in laminar flows. This illustrates that the rate of energy dissipation by magnetic reconnection is much faster in turbulent flows, and much less sensitive to microphysical reconnection rates compared to laminar flows.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:05:30 GMT" }, { "version": "v2", "created": "Tue, 18 Mar 2008 03:33:33 GMT" } ]
2009-11-13T00:00:00
[ [ "Blackman", "Eric G.", "" ], [ "Field", "George B.", "" ] ]
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801.0113
Yaron Kodriano
Y. Kodriano, D. Gershoni, E. Linder, B. Shapiro, M. E. Raikh, J. P. Reithmaier, S. Reitzenstein, A. L\"offler and A. Forchel
Spontaneously Localized Photonic Modes Due to Disorder in the Dielectric Constant
6 pages
null
null
null
cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the first experimental evidence for the existence of strongly localized photonic modes due to random two dimensional fluctuations in the dielectric constant. In one direction, the modes are trapped by ordered Bragg reflecting mirrors of a planar, one wavelength long, microcavity. In the cavity plane, they are localized by disorder, which is due to randomness in the position, composition and sizes of quantum dots located in the anti-node of the cavity. We extend the theory of disorder induced strong localization of electron states to optical modes and obtain quantitative agreement with the main experimental observations.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:11:32 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 13:14:58 GMT" }, { "version": "v3", "created": "Sun, 22 Jun 2008 06:42:03 GMT" }, { "version": "v4", "created": "Sun, 18 Apr 2010 13:09:01 GMT" } ]
2010-04-20T00:00:00
[ [ "Kodriano", "Y.", "" ], [ "Gershoni", "D.", "" ], [ "Linder", "E.", "" ], [ "Shapiro", "B.", "" ], [ "Raikh", "M. E.", "" ], [ "Reithmaier", "J. P.", "" ], [ "Reitzenstein", "S.", "" ], [ "Löffler", "A.", "" ], [ "Forchel", "A.", "" ] ]
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801.0114
Lev Aizenberg
Lev Aizenberg
Lindel\"of's hypothesis is true and Riemann's one is not
The paper is withdrawn by the author
null
null
null
math.NT math.CV
null
We present an elementary, short and simple proof of the validity of the Lindel\"of hypothesis about the Riemann zeta-function. The obtained estimate and classical results by Bohr-Landau and Littlewood disprove Riemann's hypothesis.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:16:29 GMT" }, { "version": "v2", "created": "Sat, 5 Jan 2008 15:23:42 GMT" } ]
2008-01-05T00:00:00
[ [ "Aizenberg", "Lev", "" ] ]
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801.0115
Anatoly Shabad
A.E. Shabad (1) and V.V. Usov (2) (1) (P.N. Lebedev Physics Institute, Moscow, Russia) (2) (Center for Astrophysics, Weizmann Institute of Science, Rehovot, Israel)
String-Like Electrostatic Interaction from QED with Infinite Magnetic Field
Talk at 13th Lomonosov Conf. on Elementary Particle Physics, Moscow State Univers., Moscow, August 23-29, 2007. To be published in Proceedings, edited by A.Studenikin, World Scientific, Singapore. 5 pp, 2 figs., LATEX requires 13lomcon.sty, cite.sty
in: "Particle Physics on the Eve of LHC" (Proc. of the 13th Lomonosov Conference on Elementary Particle Physics, Moscow, August 2007), ed. by A.Studenikin, World Scientific, Singapore, p. 392, 2009
null
null
hep-th astro-ph hep-lat physics.atom-ph
null
In the limit of infinite external magnetic field B the static field of an electric charge is squeezed into a string parallel to B. Near the charge the potential grows like |x_3|(ln |x_3| + const) with the coordinate x_3 along the string. The energy of the string breaking is finite and very close to the effective photon mass.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:30:18 GMT" } ]
2011-02-11T00:00:00
[ [ "Shabad", "A. E.", "" ], [ "Usov", "V. V.", "" ] ]
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801.0116
Maxim Khlopov
M. Yu. Khlopov
Primordial Black Holes
Invited contribution to Recent Advances on the Physics of Compact Objects and Grvitational Waves, 2007, Ed. J.A.de Freitas Pacheco
Res.Astron.Astrophys.10:495-528,2010
10.1088/1674-4527/10/6/001
null
astro-ph gr-qc hep-ph
null
Primordial black holes (PBHs) are a profound signature of primordial cosmological structures and provide a theoretical tool to study nontrivial physics of the early Universe. The mechanisms of PBH formation are discussed and observational constraints on the PBH spectrum, or effects of PBH evaporation, are shown to restrict a wide range of particle physics models, predicting an enhancement of the ultraviolet part of the spectrum of density perturbations, early dust-like stages, first order phase transitions and stages of superheavy metastable particle dominance in the early Universe. The mechanism of closed wall contraction can lead, in the inflationary Universe, to a new approach to galaxy formation, involving primordial clouds of massive BHs created around the intermediate mass or supermassive BH and playing the role of galactic seeds.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 22:07:47 GMT" } ]
2014-11-18T00:00:00
[ [ "Khlopov", "M. Yu.", "" ] ]
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801.0117
Shigeru Kuroda
Shigeru Kuroda
Shestakov-Umirbaev reductions and Nagata's conjecture on a polynomial automorphism
52 pages
null
null
null
math.AC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 2003, Shestakov-Umirbaev solved Nagata's conjecture on an automorphism of a polynomial ring. In the present paper, we reconstruct their theory by using the "generalized Shestakov-Umirbaev inequality", which was recently given by the author. As a consequence, we obtain a more precise tameness criterion for polynomial automorphisms. In particular, we show that no tame automorphism of a polynomial ring admits a reduction of type IV.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:48:19 GMT" }, { "version": "v2", "created": "Tue, 14 Oct 2008 03:33:49 GMT" } ]
2008-10-14T00:00:00
[ [ "Kuroda", "Shigeru", "" ] ]
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801.0118
Uzikov Yuri
Yu.N. Uzikov (JINR, Dubna, Russia)
Spin observables of the reaction pd-3He eta and quasi-bound 3He-eta pole
16 pages, Latex. Submitted to Nuclear Physics A
Nucl.Phys.A801:114-128,2008
10.1016/j.nuclphysa.2007.12.010
null
nucl-th
null
A formalism for spin observables of the reaction $pd\to ~^3He\eta$ is derived in a model independent way. The general case with a full set of six independent spin amplitudes is studied. Furthermore, approximations by five and four spin amplitudes are investigated in the near threshold region. This region is of great interest to search for a quasi-bound $^3He-\eta$ state, in particular, by measurement of energy dependence of relative phases of s- and p-wave amplitudes. Complete polarization experiments, allowing determination of spin amplitudes, are analyzed. It is shown that measurement of only analyzing powers and spin correlation coefficients hardly allows one to separate the s- and p-wave amplitudes, but additional measurement of polarization transfer coefficients simplifies this problem. Specific observables, given by products of one s- and one p-wave amplitudes, are found. Measurement of these observables will provide new independent information on the $^3He-\eta$ pole position.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:58:38 GMT" } ]
2008-11-26T00:00:00
[ [ "Uzikov", "Yu. N.", "", "JINR, Dubna, Russia" ] ]
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801.0119
Vyacheslav Shatokhin
Vyacheslav Shatokhin, Thomas Wellens, Beno\^it Gr\'emaud, Andreas Buchleitner
Spectrum of coherently backscattered light from two atoms
14 pages, 9 figures
Phys. Rev. A 76, 043832 (2007)
10.1103/PhysRevA.76.043832
null
quant-ph
null
We present a detailed analytical and numerical analysis of the inelastic coherent backscattering spectrum of laser light incident on cold atoms. We identify frequency domains where the interference contribution can be positive \emph{as well as} negative -- or exhibits dispersive character. These distinctive features are explained by reciprocity arguments and dressed state two-photon scattering amplitudes.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 09:59:27 GMT" } ]
2009-11-13T00:00:00
[ [ "Shatokhin", "Vyacheslav", "" ], [ "Wellens", "Thomas", "" ], [ "Grémaud", "Benoît", "" ], [ "Buchleitner", "Andreas", "" ] ]
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801.012
Micha{\l} Adamaszek
Michal Adamaszek, Anna Niewiarowska
Combinatorics of the change-making problem
18 pages, 4 figures Added a partial proof of conjecture 7.6 + some minor changes
null
10.1016/j.ejc.2009.05.002
null
math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the structure of the currencies (systems of coins) for which the greedy change-making algorithm always finds an optimal solution (that is, a one with minimum number of coins). We present a series of necessary conditions that must be satisfied by the values of coins in such systems. We also uncover some relations between such currencies and their sub-currencies.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 10:40:06 GMT" }, { "version": "v2", "created": "Wed, 20 Aug 2008 08:15:23 GMT" } ]
2010-07-26T00:00:00
[ [ "Adamaszek", "Michal", "" ], [ "Niewiarowska", "Anna", "" ] ]
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801.0121
Dietrich Stauffer
D. Stauffer and S. Solomon
Applications of Physics and Mathematics to Social Science
Draft for Springer Encyclopedia of Complexity and Systems Science
null
null
null
physics.soc-ph
null
This article introduces into the whole section on Social Sciences, edited by A. Nowak for this Encyclopedia, concentrating on the applications of mathematics and physics. Here under "mathematics" we include also all computer simulations if they are not taken from physics, while physics applications include simulations of models which basically existed already in physics before they were applied to social simulations. Thus obviously there is no sharp border between applications from physics and from mathematics in the sense of our definition. Also social science is not defined precisely. We will include some economics as well as some linguistics, but not social insects or fish swarms, nor human epidemics or demography. Also, we mention not only this section by also the section on agent-based modelling edited by F. Castiglione as containing articles of social interest.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 11:00:40 GMT" } ]
2008-01-03T00:00:00
[ [ "Stauffer", "D.", "" ], [ "Solomon", "S.", "" ] ]
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801.0122
Salvatore Capozziello
S. Capozziello, M. De Laurentis, F.De Paolis, G. Ingrosso, A. Nucita
Gravitational waves from hyperbolic encounters
6 pages, 2 figures
Mod.Phys.Lett.A23:99-107,2008
10.1142/S0217732308026236
null
gr-qc
null
The emission of gravitational waves from a system of massive objects interacting on hyperbolic orbits is studied in the quadrupole approximation. Analytic expressions are derived for the gravitational radiation luminosity, the total energy output and the gravitational radiation amplitude. An estimation of the expected number of events towards different targets (i.e. globular clusters and the center of the Galaxy) is also given. In particular, for a dense stellar cluster at the galactic center, a rate up to one event per year is obtained.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 11:04:34 GMT" }, { "version": "v2", "created": "Fri, 11 Jan 2008 14:47:48 GMT" }, { "version": "v3", "created": "Wed, 16 Jan 2008 11:33:15 GMT" } ]
2008-11-26T00:00:00
[ [ "Capozziello", "S.", "" ], [ "De Laurentis", "M.", "" ], [ "De Paolis", "F.", "" ], [ "Ingrosso", "G.", "" ], [ "Nucita", "A.", "" ] ]
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801.0123
Neophytos Neophytou
Neophytos Neophytou, Abhijeet Paul, Mark S. Lundstrom and Gerhard Klimeck
Simulations of Nanowire Transistors: Atomistic vs. Effective Mass Models
6 pages, 6 figures, appeared in Journal of Computational Electronics, 2008, presented in IWCE-12
null
null
null
cond-mat.mtrl-sci cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ballistic performance of electron transport in nanowire transistors is examined using a 10 orbital sp3d5s* atomistic tight-binding model for the description of the electronic structure, and the top-of-the-barrier semiclassical ballistic model for calculation of the transport properties of the transistors. The dispersion is self consistently computed with a 2D Poisson solution for the electrostatic potential in the cross section of the wire. The effective mass of the nanowire changes significantly from the bulk value under strong quantization, and effects such as valley splitting strongly lift the degeneracies of the valleys. These effects are pronounced even further under filling of the lattice with charge. The effective mass approximation is in good agreement with the tight binding model in terms of current-voltage characteristics only in certain cases. In general, for small diameter wires, the effective mass approximation fails.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 11:56:55 GMT" }, { "version": "v2", "created": "Sat, 20 Sep 2008 09:58:31 GMT" } ]
2008-09-22T00:00:00
[ [ "Neophytou", "Neophytos", "" ], [ "Paul", "Abhijeet", "" ], [ "Lundstrom", "Mark S.", "" ], [ "Klimeck", "Gerhard", "" ] ]
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801.0124
Antonio Carvajal-Rodriguez
Antonio Carvajal-Rodriguez (Departamento de Bioquimica, Genetica e Inmunologia. Universidad de Vigo, Spain)
Simulating Genomes and Populations in the Mutation Space: An example with the evolution of HIV drug resistance
17 pages, 3 figures
null
null
null
q-bio.PE q-bio.GN q-bio.OT
null
When simulating biological populations under different evolutionary genetic models, backward or forward strategies can be followed. Backward simulations, also called coalescent-based simulations, are computationally very efficient. However, this framework imposes several limitations that forward simulation does not. In this work, a new simple and efficient model to perform forward simulation of populations and/or genomes is proposed. The basic idea considers an individual as the differences (mutations) between this individual and a reference or consensus genotype. Thus, this individual is no longer represented by its complete sequence or genotype. An example of the efficiency of the new model with respect to a more classical forward one is demonstrated. This example models the evolution of HIV resistance using the B_FR.HXB2 reference sequence to study the emergence of known resistance mutants to Zidovudine and Didanosine drugs
[ { "version": "v1", "created": "Sun, 30 Dec 2007 11:15:44 GMT" } ]
2008-01-03T00:00:00
[ [ "Carvajal-Rodriguez", "Antonio", "", "Departamento de Bioquimica, Genetica e\n Inmunologia. Universidad de Vigo, Spain" ] ]
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801.0125
Neophytos Neophytou
Neophytos Neophytou, Abhijeet Paul, Mark Lundstrom and Gerhard Klimeck
Bandstructure Effects in Silicon Nanowire Electron Transport
35 pages, 7 figures, submitted to IEEE TED
null
10.1109/TED.2008.920233
null
cond-mat.mtrl-sci cond-mat.mes-hall
null
Bandstructure effects in the electronic transport of strongly quantized silicon nanowire field-effect-transistors (FET) in various transport orientations are examined. A 10-band sp3d5s* semi-empirical atomistic tight-binding model coupled to a self consistent Poisson solver is used for the dispersion calculation. A semi-classical, ballistic FET model is used to evaluate the current-voltage characteristics. It is found that the total gate capacitance is degraded from the oxide capacitance value by 30% for wires in all the considered transport orientations ([100], [110], [111]). Different wire directions primarily influence the carrier velocities, which mainly determine the relative performance differences, while the total charge difference is weakly affected. The velocities depend on the effective mass and degeneracy of the dispersions. The [110] and secondly the [100] oriented 3nm thick nanowires examined, indicate the best ON-current performance compared to [111] wires. The dispersion features are strong functions of quantization. Effects such as valley splitting can lift the degeneracies especially for wires with cross section sides below 3nm. The effective masses also change significantly with quantization, and change differently for different transport orientations. For the cases of [100] and [111] wires the masses increase with quantization, however, in the [110] case, the mass decreases. The mass variations can be explained from the non-parabolicities and anisotropies that reside in the first Brillouin zone of silicon.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 11:48:50 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 16:48:20 GMT" } ]
2009-11-13T00:00:00
[ [ "Neophytou", "Neophytos", "" ], [ "Paul", "Abhijeet", "" ], [ "Lundstrom", "Mark", "" ], [ "Klimeck", "Gerhard", "" ] ]
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801.0126
Yuko Urakawa
Yuko Urakawa and Kei-ichi Maeda
One-loop Corrections to Scalar and Tensor Perturbations during Inflation in Stochastic Gravity
17pages, 2figures, typos corrected, to appear in PRD
Phys.Rev.D78:064004,2008
10.1103/PhysRevD.78.064004
null
hep-th gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on the stochastic gravity, we study the loop corrections to the scalar and tensor perturbations during inflation. Since the loop corrections to scalar perturbations suffer infrared (IR) divergence, we consider the IR regularization to obtain the finite value. We find that the loop corrections to the scalar perturbations are amplified by the e-folding; in other words there appear the logarithmic correction, just as discussed by M.Sloth et al. On the other hand, we find that the tensor perturbations do not suffer from infrared divergence.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 12:34:13 GMT" }, { "version": "v2", "created": "Sun, 22 Jun 2008 10:14:42 GMT" }, { "version": "v3", "created": "Mon, 11 Jan 2010 06:04:49 GMT" } ]
2010-01-11T00:00:00
[ [ "Urakawa", "Yuko", "" ], [ "Maeda", "Kei-ichi", "" ] ]
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801.0127
Sugata Kaviraj
Sugata Kaviraj (Oxford/MSSL)
A UV study of nearby luminous infrared galaxies: star formation histories and the role of AGN
MNRAS in press. Some figures degraded, high resolution version available at: http://www-astro.physics.ox.ac.uk/~skaviraj/PAPERS/lirgs_sdss.pdf
null
10.1111/j.1365-2966.2009.14399.x
null
astro-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We employ UV and optical photometry, from the GALEX and SDSS surveys respectively, to study the star formation histories of 561 luminous infrared galaxies (LIRGs) in the nearby Universe. A small fraction (~4%) of these galaxies have spheroidal or near-spheroidal morphologies and could be progenitors of elliptical galaxies. The remaining galaxies are morphologically late-type or ongoing mergers. 61% of the LIRGs do not show signs of interactions, while the remaining objects are either interacting (~18%) or show post-merger morphologies (~19%). The (SSP-weighted) average age of the underlying stellar populations in these objects is typically 5-9 Gyrs, with a mean value of ~6.8 Gyrs. ~60% of the LIRG population began their recent star formation (RSF) episode within the last Gyr, while the remaining objects began their RSF episodes 1 to 3 Gyrs in the past. Up to 35% of the stellar mass in the remnant forms in these episodes - the mean value is ~15%. The (decay) timescales of the star formation are typically a few Gyrs, indicating that the star formation rate does not decline significantly during the course of the burst. 14% of the LIRG population host (Type 2) AGN. The AGN hosts exhibit UV and optical colours that are redder than those of the normal (non-AGN) population. However, there is no evidence for a systematically higher dust content in the AGN hosts. AGN typically appear ~0.5-0.7 Gyrs after the onset of star formation and the redder colours are a result of older RSF episodes, with no measurable evidence of negative feedback from the AGN on the star formation in their host galaxies. (abridged)
[ { "version": "v1", "created": "Sun, 30 Dec 2007 16:20:33 GMT" }, { "version": "v2", "created": "Wed, 31 Dec 2008 12:09:02 GMT" }, { "version": "v3", "created": "Fri, 20 Feb 2009 22:50:49 GMT" } ]
2009-11-13T00:00:00
[ [ "Kaviraj", "Sugata", "", "Oxford/MSSL" ] ]
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801.0128
Akihisa Hayashi
A. Hayashi, Y. Ishida, T. Hashimoto, and M. Horibe
Nonlocality in unambiguous pure-state identification without classical knowledge
8 pages, no figures
null
null
null
quant-ph
null
For two bipartite pure states, we consider the problem of unambiguous identification without classical knowledge on the states. The optimal success probability by means of local operations and classical communication is shown to be less than the maximum attainable by the global measuring scheme.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 13:52:53 GMT" } ]
2008-01-03T00:00:00
[ [ "Hayashi", "A.", "" ], [ "Ishida", "Y.", "" ], [ "Hashimoto", "T.", "" ], [ "Horibe", "M.", "" ] ]
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801.0129
Vladimir Bazhanov
Vladimir V. Bazhanov, Vladimir V. Mangazeev and Sergey M. Sergeev
Quantum geometry of 3-dimensional lattices
27 pages, 10 figures. Minor corrections, references added
J.Stat.Mech.0807:P07004,2008
10.1088/1742-5468/2008/07/P07004
null
hep-th math-ph math.DG math.MP
null
We study geometric consistency relations between angles on 3-dimensional (3D) circular quadrilateral lattices -- lattices whose faces are planar quadrilaterals inscribable into a circle. We show that these relations generate canonical transformations of a remarkable ``ultra-local'' Poisson bracket algebra defined on discrete 2D surfaces consisting of circular quadrilaterals. Quantization of this structure leads to new solutions of the tetrahedron equation (the 3D analog of the Yang-Baxter equation). These solutions generate an infinite number of non-trivial solutions of the Yang-Baxter equation and also define integrable 3D models of statistical mechanics and quantum field theory. The latter can be thought of as describing quantum fluctuations of lattice geometry. The classical geometry of the 3D circular lattices arises as a stationary configuration giving the leading contribution to the partition function in the quasi-classical limit.
[ { "version": "v1", "created": "Wed, 2 Jan 2008 03:59:22 GMT" }, { "version": "v2", "created": "Thu, 13 Mar 2008 04:33:48 GMT" }, { "version": "v3", "created": "Fri, 9 May 2008 07:23:06 GMT" } ]
2008-11-26T00:00:00
[ [ "Bazhanov", "Vladimir V.", "" ], [ "Mangazeev", "Vladimir V.", "" ], [ "Sergeev", "Sergey M.", "" ] ]
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801.013
Angel Kumchev
A.V. Kumchev and J.Y. Liu
Sums of primes and squares of primes in short intervals
null
Monatsh. Math. 157 (2009), 335-363
null
null
math.NT
null
Let $\mathbf H_2$ denote the set of even integers $n \not\equiv 1 \pmod 3$. We prove that when $H \ge X^{0.33}$, almost all integers $n \in \mathbf H_2$, $X < n \le X + H$ can be represented as the sum of a prime and the square of a prime. We also prove a similar result for sums of three squares of primes.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 14:27:59 GMT" } ]
2010-08-23T00:00:00
[ [ "Kumchev", "A. V.", "" ], [ "Liu", "J. Y.", "" ] ]
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801.0131
Alexandr Savinov
Alexandr Savinov
Two-Level Concept-Oriented Data Model
null
Institute of Mathematics and Computer Science, Academy of Sciences of Moldova, Technical Report RT0006, 2007
null
Technical Report RT0006
cs.DB
null
In this paper we describe a new approach to data modelling called the concept-oriented model (CoM). This model is based on the formalism of nested ordered sets which uses inclusion relation to produce hierarchical structure of sets and ordering relation to produce multi-dimensional structure among its elements. Nested ordered set is defined as an ordered set where an each element can be itself an ordered set. Ordering relation in CoM is used to define data semantics and operations with data such as projection and de-projection. This data model can be applied to very different problems and the paper describes some its uses such grouping with aggregation and multi-dimensional analysis.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 14:29:17 GMT" } ]
2008-01-03T00:00:00
[ [ "Savinov", "Alexandr", "" ] ]
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801.0132
Heiner Kohler
Heiner Kohler
Exact diagonalisation of 1-d interacting spinless Fermions
33 pages
J. Math. Phys. 52 032107 (2011)
10.1063/1.3563580
null
math-ph cond-mat.str-el math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We acquire a method of constructing an infinite set of exact eigenfunctions of 1--d interacting spinless Fermionic systems. Creation and annihilation operators for the interacting system are found and thereby the many--body Hamiltonian is diagonalised. The formalism is applied to several examples. One example is the theory of Jack polynomials. For the Calogero-Moser-Sutherland Hamiltonian a direct proof is given that the asymptotic Bethe Ansatz is correct.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:47:47 GMT" }, { "version": "v2", "created": "Sun, 14 Nov 2010 12:52:52 GMT" } ]
2015-05-13T00:00:00
[ [ "Kohler", "Heiner", "" ] ]
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801.0133
Alexandr Savinov
Alexandr Savinov
An Approach to Programming Based on Concepts
49 pages. Related papers: http://conceptoriented.com
Institute of Mathematics and Computer Science, Academy of Sciences of Moldova, Technical Report RT0005, 2007
null
Technical Report RT0005
cs.PL
null
In this paper we describe a new approach to programming which generalizes object-oriented programming. It is based on using a new programming construct, called concept, which generalizes classes. Concept is defined as a pair of two classes: one reference class and one object class. Each concept has a parent concept which is specified using inclusion relation generalizing inheritance. We describe several important mechanisms such as reference resolution, context stack, dual methods and life-cycle management, inheritance and polymorphism. This approach to programming is positioned as a new programming paradigm and therefore we formulate its main principles and rules.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 14:43:27 GMT" } ]
2008-01-03T00:00:00
[ [ "Savinov", "Alexandr", "" ] ]
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801.0134
Tsevi Mazeh
Tsevi Mazeh
Observational Evidence for Tidal Interaction in Close Binary Systems
67 pages. Review Paper. To appear in "Tidal effects in stars, planets and disks", M.-J. Goupil and J.-P. Zahn (eds.), EAS Publications Series
null
10.1051/eas:0829001
null
astro-ph
null
This paper reviews the rich corpus of observational evidence for tidal effects in short-period binaries. We review the evidence for ellipsoidal variability and for the observational manifestation of apsidal motion in eclipsing binaries. Among the long-term effects, circularization was studied the most, and a transition period between circular and eccentric orbits has been derived for eight coeval samples of binaries. As binaries are supposed to reach synchronization before circularization, one can expect finding eccentric binaries in pseudo-synchronization state, the evidence for which is reviewed. The paper reviews the Rossiter-McLaughlin effect and its potential to study spin-orbit alignment. We discuss the tidal interaction in close binaries that are orbited by a third distant companion, and review the effect of pumping the binary eccentricity by the third star. We then discuss the idea that the tidal interaction induced by the eccentricity modulation can shrink the binary separation. The paper discusses the extrasolar planets and the observational evidence for tidal interaction with their parent stars which can induce radial drift of short-period planets and circularization of planetary orbits. The paper reviews the revolution of the study of binaries that is currently taking place, driven by large-scaled photometric surveys that are detecting many thousands of new binaries and tens of extrasolar planets. In particular, we review several studies that have been used already thousands of lightcurves of eclipsing binaries to study tidal circularization of early-type stars in the LMC.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 14:46:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Mazeh", "Tsevi", "" ] ]
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801.0135
Alexandr Savinov
Alexandr Savinov
Concepts and their Use for Modelling Objects and References in Programming Languages
43 pages. Related papers: http://conceptoriented.com/
Institute of Mathematics and Computer Science, Academy of Sciences of Moldova, Technical Report RT0004, 2007
null
Technical Report RT0004
cs.PL
null
In the paper a new programming construct, called concept, is introduced. Concept is pair of two classes: a reference class and an object class. Instances of the reference classes are passed-by-value and are intended to represent objects. Instances of the object class are passed-by-reference. An approach to programming where concepts are used instead of classes is called concept-oriented programming (CoP). In CoP objects are represented and accessed indirectly by means of references. The structure of concepts describes a hierarchical space with a virtual address system. The paper describes this new approach to programming including such mechanisms as reference resolution, complex references, method interception, dual methods, life-cycle management inheritance and polymorphism.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 14:50:01 GMT" } ]
2008-01-03T00:00:00
[ [ "Savinov", "Alexandr", "" ] ]
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801.0136
Alexandr Savinov
Alexandr Savinov
Indirect Object Representation and Access by Means of Concepts
8 pages. Related papers: http://conceptoriented.com/
Institute of Mathematics and Computer Science, Academy of Sciences of Moldova, Technical Report, 2006
null
null
cs.PL
null
The paper describes a mechanism for indirect object representation and access (ORA) in programming languages. The mechanism is based on using a new programming construct which is referred to as concept. Concept consists of one object class and one reference class both having their fields and methods. The object class is the conventional class as defined in OOP with instances passed by reference. Instances of the reference class are passed by value and are intended to represent objects. The reference classes are used to describe how objects have to be represented and accessed by providing custom format for their identifiers and custom access procedures. Such an approach to programming where concepts are used instead of classes is referred to as concept-oriented programming. It generalizes OOP and its main advantage is that it allows the programmer to describe not only the functionality of target objects but also intermediate functions which are executed behind the scenes as an object is being accessed.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 14:56:05 GMT" } ]
2008-01-03T00:00:00
[ [ "Savinov", "Alexandr", "" ] ]
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801.0137
Kay J\"org Wiese
Pierre Le Doussal, M. Cristina Marchetti, Kay Joerg Wiese
Depinning in a two-layer model of plastic flow
29 pages
Phys. Rev. B 78, 224201 (2008)
10.1103/PhysRevB.78.224201
LPTENS 08/02
cond-mat.dis-nn
null
We study a model of two layers, each consisting of a d-dimensional elastic object driven over a random substrate, and mutually interacting through a viscous coupling. For this model, the mean-field theory (i.e. a fully connected model) predicts a transition from elastic depinning to hysteretic plastic depinning as disorder or viscous coupling is increased. A functional RG analysis shows that any small inter-layer viscous coupling destablizes the standard (decoupled) elastic depinning FRG fixed point for d <= 4, while for d > 4 most aspects of the mean-field theory are recovered. A one-loop study at non-zero velocity indicates, for d<4, coexistence of a moving state and a pinned state below the elastic depinning threshold, with hysteretic plastic depinning for periodic and non-periodic driven layers. A 2-loop analysis of quasi-statics unveils the possibility of more subtle effects, including a new universality class for non-periodic objects. We also study the model in d=0, i.e. two coupled particles, and show that hysteresis does not always exist as the periodic steady state with coupled layers can be dynamically unstable. It is also proved that stable pinned configurations remain dynamically stable in presence of a viscous coupling in any dimension d. Moreover, the layer model for periodic objects is stable to an infinitesimal commensurate density coupling. Our work shows that a careful study of attractors in phase space and their basin of attraction is necessary to obtain a firm conclusion for dimensions d=1,2,3.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:22:03 GMT" } ]
2009-01-07T00:00:00
[ [ "Doussal", "Pierre Le", "" ], [ "Marchetti", "M. Cristina", "" ], [ "Wiese", "Kay Joerg", "" ] ]
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801.0138
Andrzej Adamczak
Andrzej Adamczak
Differential cross sections for muonic atom scattering in solid hydrogenic targets
23 pages, 19 figures, 2 tables
Phys. Rev. A76, 052512 (2007)
10.1103/PhysRevA.76.052512
null
physics.atom-ph
null
The differential cross sections for low-energy muonic hydrogen atom scattering in solid molecular H$_2$, D$_2$ and T$_2$ targets under low pressure have been calculated for various temperatures. The polycrystalline fcc and hcp structure of the solid hydrogenic targets are considered. The Bragg and phonon scattering processes are described using the Debye model of a solid. The calculated cross sections are used for Monte Carlo simulations of the muonic atom slowing down in these targets. They have been successfully applied for a description of the production of the muonic atom beams in the multilayer hydrogenic crystals.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:03:49 GMT" } ]
2008-01-03T00:00:00
[ [ "Adamczak", "Andrzej", "" ] ]
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801.0139
Alexandr Savinov
Alexandr Savinov
Principles of the Concept-Oriented Data Model
54 pages. Related papers: http://conceptoriented.com/
Institute of Mathematics and Computer Science, Academy of Sciences of Moldova, Technical Report, 2004
null
null
cs.DB
null
In the paper a new approach to data representation and manipulation is described, which is called the concept-oriented data model (CODM). It is supposed that items represent data units, which are stored in concepts. A concept is a combination of superconcepts, which determine the concept's dimensionality or properties. An item is a combination of superitems taken by one from all the superconcepts. An item stores a combination of references to its superitems. The references implement inclusion relation or attribute-value relation among items. A concept-oriented database is defined by its concept structure called syntax or schema and its item structure called semantics. The model defines formal transformations of syntax and semantics including the canonical semantics where all concepts are merged and the data semantics is represented by one set of items. The concept-oriented data model treats relations as subconcepts where items are instances of the relations. Multi-valued attributes are defined via subconcepts as a view on the database semantics rather than as a built-in mechanism. The model includes concept-oriented query language, which is based on collection manipulations. It also has such mechanisms as aggregation and inference based on semantics propagation through the database schema.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:04:25 GMT" } ]
2008-01-03T00:00:00
[ [ "Savinov", "Alexandr", "" ] ]
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801.014
Holger Knieling
Holger Knieling, Reinhard Richter, Ingo Rehberg, Gunar Matthies, and Adrian Lange
Growth of surface undulations at the Rosensweig instability
12 pages, 12 figures
Phys. Rev. E 76, 066301 (2007)
10.1103/PhysRevE.76.066301
null
nlin.PS
null
We investigate the growth of a pattern of liquid crests emerging in a layer of magnetic liquid when subjected to a magnetic field oriented normally to the fluid surface. After a steplike increase of the magnetic field, the temporal evolution of the pattern amplitude is measured by means of a Hall-sensor array. The extracted growth rate is compared with predictions from linear stability analysis by taking into account the proper nonlinear magnetization curve M(H). The remaining discrepancy can be resolved by numerical calculations via the finite-element method. By starting with a finite surface perturbation, it can reproduce the temporal evolution of the pattern amplitude and the growth rate. The investigations are performed for two magnetic liquids, one with low and one with high viscosity.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 17:06:26 GMT" } ]
2008-01-03T00:00:00
[ [ "Knieling", "Holger", "" ], [ "Richter", "Reinhard", "" ], [ "Rehberg", "Ingo", "" ], [ "Matthies", "Gunar", "" ], [ "Lange", "Adrian", "" ] ]
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801.0141
Robert Bluhm
Robert Bluhm
Effects of Spontaneous Lorentz Violation in Gravity
Corrected typos. Talk presented at "From Quantum to Emergent Gravity: Theory and Phenomenology," June 2007, Trieste, Italy
PoSQG-Ph:009,2007
null
null
gr-qc hep-th
null
Spontaneous breaking of local Lorentz symmetry occurs when a local vector or tensor field acquires a nonzero vacuum expectation value. The effects of such breaking are examined in the context of gravity theory. These include an associated spontaneous breaking of diffeomorphism symmetry and generation of massless Nambu-Goldstone modes. The possibility of a Higgs mechanism is examined as well, and it is found that the conventional Higgs mechanism (giving rise to massive gauge fields) does not occur in a Riemann spacetime. However, in a Riemann-Cartan spacetime a Higgs mechanism involving the spin connection is possible. Despite the lack of a conventional Higgs mechanism in Riemann spacetime, additional massive modes involving the metric can appear through unconventional processes that have no analogue in nonabelian gauge theory. The effects of these types of processes are illustrated using a specific model, known as a bumblebee model, in which a vector field acquires a vacuum value.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:34:01 GMT" }, { "version": "v2", "created": "Thu, 17 Jan 2008 03:31:13 GMT" } ]
2008-11-26T00:00:00
[ [ "Bluhm", "Robert", "" ] ]
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801.0142
Francesco Mainardi
Rudolf Gorenflo, Entsar A.A. Abdel-Rehim
From Power Laws to Fractional Diffusion: the Direct Way
12 pages, 4 figures
Vietnam Journal of Mathematics, Vol. 32 (SI), 65-75 (2004)
null
null
math.PR math-ph math.MP
null
Starting from the model of continuous time random walk, we focus our interest on random walks in which the probability distributions of the waiting times and jumps have fat tails characterized by power laws with exponent between 0 and 1 for the waiting times, between 0 and 2 for the jumps. By stating the relevant lemmata (of Tauber type) for the distribution functions we need not distinguish between continuous and discrete space and time. We will see that, by a well-scaled passage to the diffusion limit, generalized diffusion processes, fractional in time as well as in space, are obtained. The corresponding equation of evolution is a linear partial pseudo-differential equation with fractional derivatives in time and in space, the orders being equal to the above exponents. Such processes are well approximated and visualized by simulation via various types of random walks. For their explicit solutions there are available integral representations that allow to investigate their detailed structure.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:35:40 GMT" } ]
2008-01-03T00:00:00
[ [ "Gorenflo", "Rudolf", "" ], [ "Abdel-Rehim", "Entsar A. A.", "" ] ]
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801.0143
Soumitra Nandi
Soumitra Nandi, Ulrich Nierste
Resolving the sign ambiguity in Delta Gamma_s with B_s -> D_s K
6 pages, 2 eps figures, typos in Eqs. (8) and (11) corrected
Phys.Rev.D77:054010,2008
10.1103/PhysRevD.77.054010
CU-PHYSICS/15-2007, TTP07-37
hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The analysis of tagged B_s -> J/psi phi decays determines the CP phase phi_s in B_s-anti-B_s mixing with a two-fold ambiguity. The solutions differ in the sign of cos(phi_s) which equals the sign of the width difference Delta Gamma_s among the two B_s mass eigenstates. We point out that this ambiguity can be removed with the help of B_s -> D_s K decays. We compare untagged and tagged strategies and find the tagged analysis more promising. The removal of the sign ambiguity in Delta Gamma_s can be done with relatively low statistics and could therefore be a target for the early stage of B_s -> D_s K studies.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 15:44:00 GMT" }, { "version": "v2", "created": "Fri, 28 Mar 2008 10:54:32 GMT" }, { "version": "v3", "created": "Tue, 13 Mar 2012 19:34:54 GMT" } ]
2012-03-14T00:00:00
[ [ "Nandi", "Soumitra", "" ], [ "Nierste", "Ulrich", "" ] ]
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801.0144
Arun Palakkandy
Shabnam Siddiqui, Chhaya Ravi Kant, P. Arun and N.C.Mehra
Characterization of ZnO:Si Nanocomposite Films Grown by Thermal Evaporation
13 pages with 5 figures
null
10.1016/j.physleta.2008.10.028
null
cond-mat.mtrl-sci
null
Nanocomposite thin films of Zinc Oxide and Silicon were grown by co-evaporating powdered ZnO and Si. This resulted in nanocrystallites of ZnO being embedded in Silicon. The mismatch in crystal structures of constituent materials result in the ZnO nanocrystals to exist in a state of stress. This along with oxygen vacancies in the samples result in good Photoluminescence emission at 520nm. Also, Silicon background gave a photoluminescence emission at 620nm. The structure was found quite stable over time since the homgenously dispersed ZnO nanocrystals do not agglomerate. The nanocomposites promises to be a useful candidate for future optoelectronic devices.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 16:14:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Siddiqui", "Shabnam", "" ], [ "Kant", "Chhaya Ravi", "" ], [ "Arun", "P.", "" ], [ "Mehra", "N. C.", "" ] ]
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801.0145
Tomasz Dietl
Tomasz Dietl
Lecture Notes on Semiconductor Spintronics
Proc. 43rd Winter School in Schladming, Austria, Febr. 2005, "Modern Aspects of Spin Physics", ed. J. Fabian - Lecture Notes, vol. 712 (springer, Berlin, 2007) pp. 1-46, 15 figures
Lectures Notes, vol. 712 (Springer, Berlin, 2007), pp. 1-46
null
null
cond-mat.mtrl-sci cond-mat.str-el
null
These informal lecture notes describe the progress in semiconductor spintronics in a historic perspective as well as in a comparison to achievements of spintronics of ferromagnetic metals. After outlining motivations behind spintronic research, selected results of investigations on three groups of materials are presented. These include non-magnetic semiconductors, hybrid structures involving semiconductors and ferromagnetic metals, and diluted magnetic semiconductors either in paramagnetic or ferromagnetic phase. Particular attention is paid to the hole-controlled ferromagnetic systems whose thermodynamic, micromagnetic, transport, and optical properties are described in detail together with relevant theoretical models.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 16:19:05 GMT" } ]
2008-01-03T00:00:00
[ [ "Dietl", "Tomasz", "" ] ]
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801.0146
Francesco Mainardi
Rudolf Gorenflo, Francesco Mainardi
Some recent advances in theory and simulation of fractional diffusion processes
33 pages, 3 Figures, 5 eps files. Second International Workshop on Analysis and Numerical Approximation of Singular Problems (IWANASP 2006), 6-8 September 2006, Aegean University in Karlovassi, Samos, Greece
null
null
null
math.PR math-ph math.MP nlin.CD
null
To offer a view into the rapidly developing theory of fractional diffusion processes we describe in some detail three topics of present interest: (i) the well-scaled passage to the limit from continuous time random walk under power law assumptions to space-time fractional diffusion, (ii) the asymptotic universality of the Mittag-Leffler waiting time law in time-fractional processes, (iii) our method of parametric subordination for generating particle trajectories.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 17:20:41 GMT" }, { "version": "v2", "created": "Sat, 3 May 2008 09:57:51 GMT" } ]
2008-05-18T00:00:00
[ [ "Gorenflo", "Rudolf", "" ], [ "Mainardi", "Francesco", "" ] ]
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801.0147
Robert Laing
R. A. Laing (1), A. H. Bridle (2) ((1) ESO Garching, (2) NRAO Charlottesville)
Jet-environment interactions in FRI radio galaxies
10 pages, 9 figures, to appear in Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, T. A. Rector and D. S. De Young (eds.), ASP Conference Series
null
null
null
astro-ph
null
There is now unequivocal evidence that the jets in FR I radio galaxies are initially relativistic, decelerating flows. On the assumption that they are axisymmetric and intrinsically symmetrical (a good approximation close to the nucleus), we can make models of their geometry, velocity, emissivity and field structure whose parameters can be determined by fitting to deep VLA observations. Mass entrainment - either from stellar mass loss within the jet volume or via a boundary layer at the jet surface - is the most likely cause for deceleration. This idea is quantitatively consistent with the velocity field and geometry inferred from kinematic modelling and the external gas density and pressure profiles derived from X-ray observations. The jets must initially be very light, perhaps with an electron-positron composition.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 17:34:15 GMT" } ]
2008-01-03T00:00:00
[ [ "Laing", "R. A.", "" ], [ "Bridle", "A. H.", "" ] ]
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801.0148
Mark Villarino B
Mark B. Villarino
An Integral Inequality and the Riccati-Bernoulli Differential Equation
12 pages. This paper has been withdrawn. The proof was too long
null
null
null
math.CA
null
We apply an integral inequality to obtain a rigorous apriori estimate of the accuracy of the partial sum to the power series solution of the celebrated Riccati-Bernoulli differential equation
[ { "version": "v1", "created": "Sun, 30 Dec 2007 17:38:39 GMT" }, { "version": "v2", "created": "Wed, 15 Feb 2012 15:15:23 GMT" } ]
2012-02-16T00:00:00
[ [ "Villarino", "Mark B.", "" ] ]
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801.0149
Ashoke Sen
Shamik Banerjee and Ashoke Sen
S-duality Action on Discrete T-duality Invariants
LaTeX file, 10 pages
JHEP 0804:012,2008
10.1088/1126-6708/2008/04/012
null
hep-th
null
In heterotic string theory compactified on T^6, the T-duality orbits of dyons of charge (Q,P) are characterized by O(6,22;R) invariants Q^2, P^2 and Q.P together with a set of invariants of the discrete T-duality group O(6,22;Z). We study the action of S-duality group on the discrete T-duality invariants and study its consequence for the dyon degeneracy formula. In particular we find that for dyons with torsion r, the degeneracy formula, expressed as a function of Q^2, P^2 and Q.P, is required to be manifestly invariant under only a subgroup of the S-duality group. This subgroup is isomorphic to \Gamma^0(r). Our analysis also shows that for a given torsion r, all other discrete T-duality invariants are characterized by the elements of the coset SL(2,Z)/\Gamma^0(r).
[ { "version": "v1", "created": "Sun, 30 Dec 2007 17:48:19 GMT" } ]
2009-09-15T00:00:00
[ [ "Banerjee", "Shamik", "" ], [ "Sen", "Ashoke", "" ] ]
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801.015
Yurii Lozovik
Yu. E. Lozovik, I. L. Kurbakov, G. E. Astrakharchik, J. Boronat, M. Willander
Effects of strong correlations for 2D Bose-Einstein condensed dipolar excitons
null
Sol.St.Comms., 144, 399-404 (2007)
10.1016/j.ssc.2007.07.041
null
cond-mat.str-el
null
By doing quantum Monte Carlo ab initio simulations we show that dipolar excitons, which are now under experimental study, actually are strongly correlated systems. Strong correlations manifest in significant deviations of excitation spectra from the Bogoliubov one, large Bose condensate depletion, short-range order in the pair correlation function, and peak(s) in the structure factor.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 18:02:15 GMT" } ]
2009-11-13T00:00:00
[ [ "Lozovik", "Yu. E.", "" ], [ "Kurbakov", "I. L.", "" ], [ "Astrakharchik", "G. E.", "" ], [ "Boronat", "J.", "" ], [ "Willander", "M.", "" ] ]
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801.0151
M\'at\'e Nagy
Balazs Gonci, Mate Nagy, Tamas Vicsek
Phase transition in the scalar noise model of collective motion in three dimensions
7 pages, 6 figures; submitted to EPJ on 17 of April, 2007
Eur. Phys. J. Special Topics 157, 53-59 (2008)
10.1140/epjst/e2008-00630-2
null
cond-mat.stat-mech
null
We consider disorder-order phase transitions in the three-dimensional version of the scalar noise model (SNM) of flocking. Our results are analogous to those found for the two-dimensional case. For small velocity (v <= 0.1) a continuous, second-order phase transition is observable, with the diffusion of nearby particles being isotropic. By increasing the particle velocities the phase transition changes to first order, and the diffusion becomes anisotropic. The first-order transition in the latter case is probably caused by the interplay between anisotropic diffusion and periodic boundary conditions, leading to a boundary condition dependent symmetry breaking of the solutions.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 18:33:20 GMT" }, { "version": "v2", "created": "Tue, 8 Apr 2008 16:38:00 GMT" } ]
2008-04-24T00:00:00
[ [ "Gonci", "Balazs", "" ], [ "Nagy", "Mate", "" ], [ "Vicsek", "Tamas", "" ] ]
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801.0152
Yurii Lozovik
Yu. E. Lozovik, I. L. Kurbakov, M. Willander
Superfluidity of two- dimensional excitons in flat and harmonic traps
null
Phys. Lett. A 366, No. 4-5, 487-492 (2007)
10.1016/j.physleta.2007.01.080
null
cond-mat.str-el
null
Superfluid exciton density and superfluid transition (crossover) temperature are calculated for 2D excitons in large-size flat and harmonic traps. A generalized local density approximation for the Kosterlitz-Thouless theory is developed.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 18:06:09 GMT" } ]
2009-11-13T00:00:00
[ [ "Lozovik", "Yu. E.", "" ], [ "Kurbakov", "I. L.", "" ], [ "Willander", "M.", "" ] ]
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801.0153
Richard Melrose
Richard Melrose
Star products and local line bundles
Already published by Ann. Inst. Fourier (Grenoble)
null
null
null
math.DG math.AP
null
The notion of a local line bundle on a manifold, classified by 2-cohomology with real coefficients, is introduced. The twisting of pseudodifferential operators by such a line bundle leads to an algebroid with elliptic elements with real-valued index, given by a twisted variant of the Atiyah-Singer index formula. Using ideas of Boutet de Monvel and Guillemin the corresponding twisted Toeplitz algebroid on any compact symplectic manifold is shown to yield the star products of Lecomte and DeWilde ([MR84g:17014]) see also Fedosov's construction in [MR92k:58267]. This also shows that the trace on the star algebra is identified with the residue trace of Wodzicki and Guillemin
[ { "version": "v1", "created": "Sun, 30 Dec 2007 18:19:02 GMT" } ]
2008-01-03T00:00:00
[ [ "Melrose", "Richard", "" ] ]
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801.0154
Robert Laing
R. A. Laing (1), A. H. Bridle (2), W. D. Cotton (2), D. M. Worrall (3), M. Birkinshaw (3) ((1) ESO Garching, (2) NRAO Charlottesville, (3) U. Bristol)
Jet spectra in FR I radio galaxies: implications for particle acceleration
5 pages, 3 figures, to appear in Extragalactic Jets: Theory and Observation from Radio to Gamma Ray, T. A. Rector and D. S. De Young (eds.), ASP Conference Series
null
null
null
astro-ph
null
We describe very accurate imaging of radio spectral index for the inner jets in three FR I radio galaxies. Where the jets first brighten, there is a remarkably small dispersion around a spectral index of 0.62. This is also the region where bright X-ray emission is detected. Further from the nucleus, the spectral index flattens slightly to 0.50 - 0.55 and X-ray emission, although still detectable, is fainter relative to the radio. The brightest X-ray emission from the jets is therefore not associated with the flattest radio spectra, but rather with some particle-acceleration process whose characteristic energy index is 2.24. The change in spectral index occurs roughly where our relativistic jet models require rapid deceleration. Flatter-spectrum edges can be seen where the jets are isolated from significant surrounding diffuse emission and we suggest that these are associated with shear.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 19:01:54 GMT" } ]
2008-01-03T00:00:00
[ [ "Laing", "R. A.", "" ], [ "Bridle", "A. H.", "" ], [ "Cotton", "W. D.", "" ], [ "Worrall", "D. M.", "" ], [ "Birkinshaw", "M.", "" ] ]
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801.0155
Charles Bordenave
Charles Bordenave and Marc Lelarge
Resolvent of Large Random Graphs
21 pages, 1 figure
null
null
null
math.PR math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the convergence of the spectrum of large random graphs to the spectrum of a limit infinite graph. We apply these results to graphs converging locally to trees and derive a new formula for the Stieljes transform of the spectral measure of such graphs. We illustrate our results on the uniform regular graphs, Erdos-Renyi graphs and preferential attachment graphs. We sketch examples of application for weighted graphs, bipartite graphs and the uniform spanning tree of n vertices.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 11:47:47 GMT" }, { "version": "v2", "created": "Tue, 22 Jan 2008 13:51:10 GMT" }, { "version": "v3", "created": "Tue, 5 May 2009 12:55:00 GMT" } ]
2009-05-05T00:00:00
[ [ "Bordenave", "Charles", "" ], [ "Lelarge", "Marc", "" ] ]
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801.0156
Alexey Shorokhov Dr
I.A. Kokurin, V.A. Margulis
Effect of short-range impurities on low-temperature conductance and thermopower of quantum wires
5 pages, 1 figure
null
null
null
cond-mat.mes-hall
null
The electron transport through the parabolic quantum wire placed in longitudinal magnetic field in the presence of the system of short-range impurities inside the wire is investigated. Using approach based on the zero-range potential theory we obtained an exact formula for the transmission coefficient of the electron through the wire that allows to calculate such the transport characteristics as the conductance and differential thermopower. The dependencies of conductance and thermopower on the chemical potential and magnetic field are investigated. The effect of elastic scattering due to short-range impurities on low-temperature conductance and thermopower is studied. It was shown that the character of the electron transport essentially depends on the position of the every scattering center. The presence even isolated impurity leads to destruction of conductance quantization. In some cases it is possible that thermopower can change the sign in dependence on chemical potential and magnetic field.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 19:08:25 GMT" } ]
2008-01-03T00:00:00
[ [ "Kokurin", "I. A.", "" ], [ "Margulis", "V. A.", "" ] ]
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801.0157
Jurgen Fuchs
Till Barmeier, J"urgen Fuchs, Ingo Runkel, Christoph Schweigert
On the Rosenberg-Zelinsky sequence in abelian monoidal categories
34 pages, some figures, v2: minor typos corrected, version to be published in J. reine angew. Math. (Crelle)
null
null
KCL-MTH-07-18, ZMP-HH/07-13, Hamburger Beitr. 294
math.CT hep-th math.QA math.RA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider Frobenius algebras and their bimodules in certain abelian monoidal categories. In particular we study the Picard group of the category of bimodules over a Frobenius algebra, i.e. the group of isomorphism classes of invertible bimodules. The Rosenberg-Zelinsky sequence describes a homomorphism from the group of algebra automorphisms to the Picard group, which however is typically not surjective. We investigate under which conditions there exists a Morita equivalent Frobenius algebra for which the corresponding homomorphism is surjective. One motivation for our considerations is the orbifold construction in conformal field theory.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 19:09:15 GMT" }, { "version": "v2", "created": "Wed, 9 Dec 2009 16:42:08 GMT" } ]
2009-12-09T00:00:00
[ [ "Barmeier", "Till", "" ], [ "Fuchs", "J\"urgen", "" ], [ "Runkel", "Ingo", "" ], [ "Schweigert", "Christoph", "" ] ]
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801.0158
Celine Levy-Leduc
C\'eline L\'evy-Leduc (LTCI), Eric Moulines (LTCI), Fran\c{c}ois Roueff (LTCI)
Frequency estimation based on the cumulated Lomb-Scargle periodogram
Nombre de pages : 22
null
null
null
math.ST stat.TH
null
We consider the problem of estimating the period of an unknown periodic function observed in additive noise sampled at irregularly spaced time instants in a semiparametric setting. To solve this problem, we propose a novel estimator based on the cumulated Lomb-Scargle periodogram. We prove that this estimator is consistent, asymptotically Gaussian and we provide an explicit expression of the asymptotic variance. Some Monte-Carlo experiments are then presented to support our claims.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 19:24:32 GMT" } ]
2008-01-03T00:00:00
[ [ "Lévy-Leduc", "Céline", "", "LTCI" ], [ "Moulines", "Eric", "", "LTCI" ], [ "Roueff", "François", "", "LTCI" ] ]
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801.0159
Petros Petrosyan
P.A. Petrosyan
Interval Edge Colorings of Mobius Ladders
5 pages (in Russian)
Proceedings of the CSIT Conference, Yerevan, 2005, 146-149
null
null
cs.DM
null
An interval edge t-coloring of a graph G is a proper edge coloring of G with colors 1,2...,t such that at least one edge of G is colored by color i,i=1,2...,t, and the edges incident with each vertex x are colored by d_{G}(x) consecutive colors, where d_{G}(x) is the degree of the vertex x in G. For Mobius ladders the existence of this coloring is proved and all possible numbers of colors in such colorings are found.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 09:59:07 GMT" } ]
2008-01-03T00:00:00
[ [ "Petrosyan", "P. A.", "" ] ]
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801.016
Andre Geim K
L. A. Ponomarenko, F. Schedin, M. I. Katsnelson, R. Yang, E. H. Hill, K. S. Novoselov, A. K.Geim
Chaotic Dirac billiard in graphene quantum dots
null
Science 320, 356-358 (2008)
10.1126/science.1154663
null
cond-mat.mes-hall
null
We report on transport characteristics of quantum dot devices etched entirely in graphene. At large sizes, they behave as conventional single-electron transistors, exhibiting periodic Coulomb blockade peaks. For quantum dots smaller than 100 nm, the peaks become strongly non-periodic indicating a major contribution of quantum confinement. Random peak spacing and its statistics are well described by the theory of chaotic neutrino (Dirac) billiards. Short constrictions of only a few nm in width remain conductive and reveal a confinement gap of up to 0.5eV, which demonstrates the in-principle possibility of molecular-scale electronics based on graphene.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 19:32:42 GMT" } ]
2008-04-18T00:00:00
[ [ "Ponomarenko", "L. A.", "" ], [ "Schedin", "F.", "" ], [ "Katsnelson", "M. I.", "" ], [ "Yang", "R.", "" ], [ "Hill", "E. H.", "" ], [ "Novoselov", "K. S.", "" ], [ "Geim", "A. K.", "" ] ]
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801.0161
John Quigg
S. Kaliszewski, John Quigg, Iain Raeburn
Proper actions, fixed-point algebras and naturality in nonabelian duality
19 pages; minor revision
null
null
null
math.OA math.CT
null
Suppose a locally compact group G acts freely and properly on a locally compact Hausdorff space X, and let gamma be the induced action on C_0(X). We consider a category in which the objects are C*-dynamical systems (A, G, alpha) for which there is an equivariant homomorphism of (C_0(X), gamma) into the multiplier algebra M(A). Rieffel has shown that such systems are proper and saturated, and hence have a generalized fixed-point algebra A^alpha which is Morita equivalent to A times_{alpha,r} G. We show that the assignment (A, alpha) maps to A^alpha is functorial, and that Rieffel's Morita equivalence is natural in a suitable sense. We then use our results to prove a categorical version of Landstad duality which characterizes crossed products by coactions, and to prove that Mansfield imprimitivity for crossed products by homogeneous spaces is natural.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 19:39:50 GMT" }, { "version": "v2", "created": "Fri, 14 Mar 2008 21:57:16 GMT" }, { "version": "v3", "created": "Mon, 14 Apr 2008 22:25:50 GMT" } ]
2008-04-15T00:00:00
[ [ "Kaliszewski", "S.", "" ], [ "Quigg", "John", "" ], [ "Raeburn", "Iain", "" ] ]
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801.0162
Sergey Gaifullin
Sergey A. Gaifullin
Affine Toric SL(2)-embeddings
16 pages
null
10.1070/SM2008v199n03ABEH003922
null
math.AG
null
In 1973 V.L.Popov classified affine SL(2)-embeddings. He proved that a locally transitive SL(2)-action on a normal affine three-dimensional variety X is uniquely determined by a pair (p/q, r), where 0<p/q<=1 is an uncancelled fraction and r is a positive integer. Here r is the order of the stabilizer of a generic point. In this paper we show that the variety X is toric, i.e. admits a locally transitive action of an algebraic torus, if and only if r is divisible by q-p. To do this we prove the following necessary and sufficient condition for an affine G/H-embedding to be toric. Suppose X is a normal affine variety, G is a simply connected semisimple algebraic group acting regularly on X, H is a closed subgroup of G such that the character group $\mathfrak{X}(H)$ is finite and G/H -> X is a dense open equivariant embedding. Then X is toric if and only if there exist a quasitorus T and a $(G\times T)$-module V such that $X\stackrel{G}{\cong} V//T$. The key role in the proof plays D. Cox's construction.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 20:02:10 GMT" } ]
2009-11-13T00:00:00
[ [ "Gaifullin", "Sergey A.", "" ] ]
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801.0163
Lynne Hillenbrand
Lynne A. Hillenbrand, John M. Carpenter, Jinyoung Serena Kim, Michael R. Meyer, Dana E. Backman, Amaya Moro-Martin, David J. Hollenbach, Dean C. Hines, Ilaria Pascucci, Jeroen Bouwman
The Complete Census of 70-um-Bright Debris Disks within the FEPS (Formation and Evolution of Planetary Systems) Spitzer Legacy Survey of Sun-like Stars
article accepted to ApJ
null
10.1086/529027
null
astro-ph
null
(abbreviated) We report detection with the Spitzer Space Telescope of cool dust surrounding solar type stars. The observations were performed as part of the Legacy Science Program, ``Formation and Evolution of Planetary Systems'' (FEPS). From the overall FEPS sample (Meyer et al. 2006) of 328 stars having ages ~0.003-3 Gyr we have selected sources with 70 um flux densities indicating excess in their spectral energy distributions above expected photospheric emission........ .....The rising spectral energy distributions towards - and perhaps beyond - 70 um imply dust temperatures T_dust <45-85 K for debris in equilibrium with the stellar radiation field. We infer bulk properties such as characteristic temperature, location, fractional luminosity, and mass of the dust from fitted single temperature blackbody models. For >1/3 of the debris sources we find that multiple temperature components are suggested, implying a spatial distribution of dust extending over many tens of AU. Because the disks are dominated by collisional processes, the parent body (planetesimal) belts may be extended as well. Preliminary assessment of the statistics of cold debris around sun-like stars shows that ~10% of FEPS targets with masses between 0.6 and 1.8 Msun and ages between 30 Myr and 3 Gyr exhibit 70 um emission in excess of the expected photospheric flux density. We find that fractional excess amplitudes appear higher for younger stars and that there may be a trend in 70 um excess frequency with stellar mass.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 20:05:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Hillenbrand", "Lynne A.", "" ], [ "Carpenter", "John M.", "" ], [ "Kim", "Jinyoung Serena", "" ], [ "Meyer", "Michael R.", "" ], [ "Backman", "Dana E.", "" ], [ "Moro-Martin", "Amaya", "" ], [ "Hollenbach", "David J.", "" ], [ "Hines", "Dean C.", "" ], [ "Pascucci", "Ilaria", "" ], [ "Bouwman", "Jeroen", "" ] ]
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801.0164
Shinya Tomizawa
Toshiharu Nakagawa, Hideki Ishihara, Ken Matsuno and Shinya Tomizawa
Charged Rotating Kaluza-Klein Black Holes in Five Dimensions
18 pages, 4 figures
Phys.Rev.D77:044040,2008
10.1103/PhysRevD.77.044040
OCU-PHYS 286,AP-GR 52
hep-th
null
We construct a new charged rotating Kaluza-Klein black hole solution in the five-dimensional Einstein-Maxwell theory with a Chern-Simon term. The features of the solutions are also investigated. The spacetime is asymptotically locally flat, i.e., it asymptotes to a twisted $\rm S^1$ bundle over the four-dimensional Minkowski spacetime. The solution describe a non-BPS black hole rotating in the direction of the extra dimension. The solutions have the limits to the supersymmetric black hole solutions, a new extreme non-BPS black hole solutions and a new rotating non-BPS black hole solution with a constant twisted $\rm S^1$ fiber.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 20:34:40 GMT" } ]
2008-11-26T00:00:00
[ [ "Nakagawa", "Toshiharu", "" ], [ "Ishihara", "Hideki", "" ], [ "Matsuno", "Ken", "" ], [ "Tomizawa", "Shinya", "" ] ]
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801.0165
Daniele Alessandrini
Daniele Alessandrini
A compactification for the spaces of convex projective structures on manifolds
35 pages, 1 figure
null
null
null
math.GT math.AG
null
In this paper we construct a compactification for the parameter space of convex projective structures on a fixed n-manifold M. This parameter space is a closed semi-algebraic subset of the variety of characters of representations of the fundamental group of M in SL_{n+1}(R). The boundary is the inverse limit of an inverse system of logarithmic limit sets of this semi-algebraic set, in a sense it is the tropicalization of the parameter space. The interpretation of the boundary points can also be given using tropical geometry. This construction is a generalization of the construction of compactification of the Teichm\"uller spaces.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 20:59:51 GMT" } ]
2008-01-03T00:00:00
[ [ "Alessandrini", "Daniele", "" ] ]
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801.0166
Joseph Meiring
Joseph D. Meiring, Varsha P. Kulkarni, James T. Lauroesch, Celine Peroux, Pushpa Khare, Donald G. York, Arlin P. S. Crotts
The chemical compositions of 10 new sub-DLAs and strong Lyman-limit systems at z < 1.5
20 pages, 21 figures, accepted for publication to MNRAS
Mon.Not.Roy.Astron.Soc.384:1015-1033,2008
10.1111/j.1365-2966.2007.12819.x
null
astro-ph
null
We present chemical abundance measurements from medium resolution observations of 8 sub-damped Lyman-alpha absorber and 2 strong Lyman-limit systems at z < 1.5 observed with the MIKE spectrograph on the 6.5m Magellan II Clay telescope. These observations were taken as part of an ongoing project to determine abundances in z < 1.5 quasar absorption line systems (QSOALS) focusing on sub-DLA systems. These observations increase the sample of Zn measurements in z < 1.5 sub-DLAs by ~50%. Lines of Mg I, Mg II, Al II, Al III, Ca II, Mn II, Fe II, and Zn II were detected and column densities were determined. Zn II, a relatively undepleted element and tracer of the gas phase metallicity is detected in two of these systems, with [Zn/H]=-0.05\pm0.12 and [Zn/H]>+0.86. The latter system is however a weak system with N(H I)<18.8, and therefore may need significant ionisation corrections to the abundances. Fe II lines were detected in all systems, with an average Fe abundance of <[Fe/H]>=-0.68, higher than typical Fe abundances for DLA systems at these redshifts. This high mean [Fe/H] could be due to less depletion of Fe onto dust grains, or to higher abundances in these systems. We also discuss the relative abundances in these absorbers. The systems with high metallicity show high ratios of [Mn/Fe] and [Zn/Fe], as seen previously in another sub-DLA. These higher values of [Mn/Fe] could be a result of heavy depletion of Fe onto grains, unmixed gas, or an intrinsically non-solar abundance pattern. Based on Cloudy modeling, we do not expect ionisation effects to cause this phenomenon.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 21:07:52 GMT" } ]
2009-06-23T00:00:00
[ [ "Meiring", "Joseph D.", "" ], [ "Kulkarni", "Varsha P.", "" ], [ "Lauroesch", "James T.", "" ], [ "Peroux", "Celine", "" ], [ "Khare", "Pushpa", "" ], [ "York", "Donald G.", "" ], [ "Crotts", "Arlin P. S.", "" ] ]
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801.0167
Maxim Khlopov
M. Yu. Khlopov
Dark matter from stable charged particles?
Invited contribution to the book "Einstein and Hilbert: Dark Matter", Ed. V.Dvoeglazov
null
null
null
astro-ph hep-ph
null
Particle physics candidates for cosmological dark matter are usually considered as neutral and weakly interacting. However stable charged leptons and quarks can also exist and, hidden in elusive atoms, play the role of dark matter. The necessary condition for such scenario is absence of stable particles with charge -1 and effective mechanism for suppression of free positively charged heavy species. These conditions are realized in several recently developed scenarios. In scenario based on Walking Technicolor model excess of stable particles with charge -2 and the corresponding dark matter density is naturally related with the value and sign of cosmological baryon asymmetry. The excessive charged particles are bound with primordial helium in techni-O-helium "atoms", maintaining specific nuclear-interacting form of dark matter. Some properties of techni-O-helium Universe are discussed.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 21:55:07 GMT" } ]
2008-01-03T00:00:00
[ [ "Khlopov", "M. Yu.", "" ] ]
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801.0168
Alexander Gorban
A. N. Gorban and A. Y. Zinovyev
Elastic Maps and Nets for Approximating Principal Manifolds and Their Application to Microarray Data Visualization
35 pages 10 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, 96-130
10.1007/978-3-540-73750-6_4
null
physics.data-an physics.bio-ph
null
Principal manifolds are defined as lines or surfaces passing through ``the middle'' of data distribution. Linear principal manifolds (Principal Components Analysis) are routinely used for dimension reduction, noise filtering and data visualization. Recently, methods for constructing non-linear principal manifolds were proposed, including our elastic maps approach which is based on a physical analogy with elastic membranes. We have developed a general geometric framework for constructing ``principal objects'' of various dimensions and topologies with the simplest quadratic form of the smoothness penalty which allows very effective parallel implementations. Our approach is implemented in three programming languages (C++, Java and Delphi) with two graphical user interfaces (VidaExpert http://bioinfo.curie.fr/projects/vidaexpert and ViMiDa http://bioinfo-out.curie.fr/projects/vimida applications). In this paper we overview the method of elastic maps and present in detail one of its major applications: the visualization of microarray data in bioinformatics. We show that the method of elastic maps outperforms linear PCA in terms of data approximation, representation of between-point distance structure, preservation of local point neighborhood and representing point classes in low-dimensional spaces.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 23:40:03 GMT" } ]
2008-01-17T00:00:00
[ [ "Gorban", "A. N.", "" ], [ "Zinovyev", "A. Y.", "" ] ]
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801.0169
Maxim Khlopov
M. Yu. Khlopov
Primordial heavy elements in composite dark matter models
Prepared for Proceedings of Blois2007 Conference
null
null
null
astro-ph hep-ph nucl-ex
null
A widely accepted viewpoint is to consider candidates for cosmological dark matter as neutral and weakly interacting particles, as well as to consider only light elements in the pregalactic chemical composition. It is shown that stable charged leptons and quarks can exist and, hidden in elusive atoms, play the role of dark matter. The inevitable consequence of realistic scenarios with such composite atom-like dark matter is existence of significant or even dominant fraction of "atoms", binding heavy -2 charged particles and He-4 nuclei. Being alpha-particles with shielded electric charge, such atoms catalyse a new path of nuclear transformations in the period of Big Bang Nucleosynthesis, which result in primordial heavy elements. The arguments are given, why such scenario escapes immediate contradiction with observations and challenges search for heavy stable charged particles in cosmic rays and at accelerators.
[ { "version": "v1", "created": "Mon, 31 Dec 2007 00:49:04 GMT" } ]
2008-01-03T00:00:00
[ [ "Khlopov", "M. Yu.", "" ] ]
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801.017
Isaac Gorelic B
Isaac Gorelic
Orders of $\pi$-bases
11 pages
null
null
null
math.GN math.LO
null
We extend the scope of B. Shapirovskii's results [B.E Shapirovskii, "Cardinal invariants in Compact Hausdorff Spaces," Amer. Math. Soc. Transl. (2) Vol. 134, 1987, pp. 93-118] on the order of $\pi$-bases in compact spaces and answer some questions of V. Tkachuk in [V.V. Tkachuk, "Point-countable pi-bases in first-countable and similar spaces," Fund. Math. 186 (2005), pp.55-69].
[ { "version": "v1", "created": "Sun, 30 Dec 2007 23:00:03 GMT" } ]
2008-01-03T00:00:00
[ [ "Gorelic", "Isaac", "" ] ]
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801.0171
Ma{\l}gorzata Sztyren
M. Sztyren
Fundamental excitations in layered superconductors with long-range Josephson couplings
10 pages, 1 figure
null
null
null
cond-mat.supr-con
null
The present paper develops the ideas introduced in {\em cond-mat/0312673}. The construction of a hybrid discrete-continuous model of layered superconductors is briefly presented. The model bases on the classic Lawrence-Doniach scenario with admitting, however, long-range interactions between atomic planes. Moreover, apart from Josephson couplings they involve the proximity effects. The range of interactions, K, can, in principle, be arbitrary large. The solutions corresponding to the range K=2 are exposed. The fundamental excitations are understood as deviations from stable ground states.The formulae for energy of those excitations are constructed. The possible shapes of dispersion curves are analysed. For each type of shape the corresponding values of physically measurable quantities like effective maa and bandwidth are expressed by coupling parameters.
[ { "version": "v1", "created": "Sun, 30 Dec 2007 23:44:40 GMT" } ]
2008-01-03T00:00:00
[ [ "Sztyren", "M.", "" ] ]
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801.0172
Lyonell Boulton
Lyonell Boulton, Michael Levitin and Marco Marletta
On a class of non-self-adjoint periodic eigenproblems with boundary and interior singularities
20 pages, this final version includes correction of several typos and change of title
Journal of Differential Equations, Volume 249, Issue 12, 15 December 2010, Pages 3081-3098
null
null
math.SP math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that the spectrum of a certain PT-symmetric periodic problem is purely real. Our results extend to a larger class of potentials those recently found by Brian Davies [math.SP/0702122] and John Weir [arXiv:0711.1371].
[ { "version": "v1", "created": "Sun, 30 Dec 2007 23:54:52 GMT" }, { "version": "v2", "created": "Fri, 19 Nov 2010 11:25:14 GMT" } ]
2010-11-22T00:00:00
[ [ "Boulton", "Lyonell", "" ], [ "Levitin", "Michael", "" ], [ "Marletta", "Marco", "" ] ]
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