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712.2079
Masashi Wakamatsu
M.Wakamatsu and Y.Nakakoji
Phenomenological analysis of the nucleon spin contents and their scale dependence
35 pages, 8 figures, 2 tables, title has been changed, version to appear in Phys. Rev. D
Phys.Rev.D77:074011,2008
10.1103/PhysRevD.77.074011
OU-HET-593
hep-ph hep-ex nucl-ex
null
In the past few years, a lot of evidences have been accumulated, which indicate that the gluon polarization inside the nucleon is likely to be small at least at the low renormalization scales. On the other hand, the recent lattice QCD analyses suggest that the net orbital angular momentum carried by the quarks is nearly zero. There is also some indication noticed by Brodsky and Gardner based on the COMPASS observation of small single-spin asymmetry on the isoscalar deuteron target, that the gluon orbital angular momentum inside the nucleon is likely to be small. Naively combining all these observations, we are led to a rather embarrassing conclusion that the nucleon constituents altogether do not carry enough amount of angular momentum saturating the total nucleon spin. We show that this somewhat confused state of affairs can be cleared up only by paying careful attention to the scale dependencies of the nucleon spin decomposition.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 02:01:12 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 00:51:43 GMT" } ]
2008-11-26T00:00:00
[ [ "Wakamatsu", "M.", "" ], [ "Nakakoji", "Y.", "" ] ]
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712.208
Ken-Ichi Maruyama
Ken-ichi Maruyama, Hideaki Oshima
Homotopy groups of the spaces of self-maps of Lie groups
To appear in J. Math. Soc. Japan, Vol.60. No.3
null
null
null
math.AT
null
We compute the homotopy groups of the spaces of self maps of Lie groups of rank 2, SU(3), Sp(2), and G_2. We use the cell structures of these Lie groups and the standard methods of homotopy theory.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 03:28:44 GMT" } ]
2007-12-14T00:00:00
[ [ "Maruyama", "Ken-ichi", "" ], [ "Oshima", "Hideaki", "" ] ]
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712.2081
Dao Tien Khoa
Dao T. Khoa and Do Cong Cuong
Missing monopole strength of the Hoyle state in the inelastic $\alpha$+$^{12}$C scattering
Accepted for publication in Physics Letters B
Phys.Lett.B660:331-338,2008
10.1016/j.physletb.2007.12.059
null
nucl-th nucl-ex
null
Analyses of the inelastic $\alpha$+$^{12}$C scattering at medium energies have indicated that the strength of the Hoyle state (the isoscalar 0$^+_2$ excitation at 7.65 MeV in $^{12}$C) seems to exhaust only 7 to 9% of the monopole energy weighted sum rule (EWSR), compared to about 15% of the EWSR extracted from inelastic electron scattering data. The full monopole transition strength predicted by realistic microscopic $\alpha$-cluster models of the Hoyle state can be shown to exhaust up to 22% of the EWSR. To explore the missing monopole strength in the inelastic $\alpha$+$^{12}$C scattering, we have performed a fully microscopic folding model analysis of the inelastic $\alpha$+$^{12}$C scattering at $E_{\rm lab}=104$ to 240 MeV using the 3-$\alpha$ resonating group wave function of the Hoyle state obtained by Kamimura, and a complex density-dependent M3Y interaction newly parametrized based on the Brueckner Hartree Fock results for nuclear matter. Our folding model analysis has shown consistently that the missing monopole strength of the Hoyle state is not associated with the uncertainties in the analysis of the $\alpha$+$^{12}$C scattering, but is most likely due to the short lifetime and weakly bound structure of this state which significantly enhances absorption in the exit $\alpha$+$^{12}$C$^*(0^+_2)$ channel.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 02:17:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Khoa", "Dao T.", "" ], [ "Cuong", "Do Cong", "" ] ]
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712.2082
Rigoberto Ju\'arez-Maldonado
Marco Antonio Ch\'avez-Rojo, Rigoberto Ju\'arez-Maldonado and Magdaleno Medina-Noyola
Diffusion of Colloidal Fluids in Random Porous Media
10 pages, 2 figures
null
10.1103/PhysRevE.77.040401
null
cond-mat.mtrl-sci
null
A simple manner to describe the diffusive relaxation of a colloidal fluid adsorbed in a porous medium is to model the porous medium as a set of spherical particles fixed in space at random positions with prescribed statistical structural properties. Within this model one may describe the relaxation of concentration fluctuations of the adsorbed fluid by simply setting to zero the short-time mobility of one species (the porous matrix) in a theory of the dynamics of equilibrium colloidal mixtures, or by extending such dynamic theory to explicitly consider the porous matrix as a random external field. Here we consider the first approach and employ the self-consistent generalized Langevin equation (SCGLE) theory of the dynamics of equilibrium colloidal mixtures, to describe the dynamics of the mobile component. We conclude that if the correct static structure factors are provided as input, the SCGLE theory correctly predicts the main features of the dynamics of the permeating fluid.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 02:20:25 GMT" } ]
2009-11-13T00:00:00
[ [ "Chávez-Rojo", "Marco Antonio", "" ], [ "Juárez-Maldonado", "Rigoberto", "" ], [ "Medina-Noyola", "Magdaleno", "" ] ]
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712.2083
An Chan
A. Chan, S. C. Liew
VoIP over Multiple IEEE 802.11 Wireless LANs
null
null
null
null
cs.NI
null
Prior work indicates that 802.11 is extremely inefficient for VoIP transport. Only 12 and 60 VoIP sessions can be supported in an 802.11b and an 802.11g WLAN, respectively. This paper shows that the bad news does not stop there. When there are multiple WLANs in the vicinity of each other, the already-low VoIP capacity can be further eroded in a significant manner. For example, in a 5-by-5, 25-cell multi-WLAN network, the VoIP capacities for 802.11b and 802.11g are only 1.63 and 10.34 sessions per AP, respectively. This paper investigates several solutions to improve the VoIP capacity. Based on a conflict graph model, we propose a clique-analytical call-admission scheme, which increases the VoIP capacity by 52% and 37% in 802.11b and 802.11g respectively. If all the three orthogonal frequency channels available in 11b and 11g are used, the capacity can be nearly tripled by the call-admission scheme. This paper also proposes for the first time the use of coarse-grained time-division multiple access (CoTDMA) in conjunction with the basic 802.11 CSMA to eliminate the performance-degrading exposed-node and hidden-node problems. We find that CoTDMA can further increase the VoIP capacity in the multi-WLAN scenario by an additional 35%.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 02:25:14 GMT" } ]
2007-12-14T00:00:00
[ [ "Chan", "A.", "" ], [ "Liew", "S. C.", "" ] ]
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712.2084
Bei Zeng
Bei Zeng, Xie Chen, Isaac L. Chuang
Semi-Clifford operations, structure of $\mathcal{C}_k$ hierarchy, and gate complexity for fault-tolerant quantum computation
13 pages, 10 figures
Phys. Rev. A 77, 042313 (2008)
10.1103/PhysRevA.77.042313
null
quant-ph
null
Teleportation is a crucial element in fault-tolerant quantum computation and a complete understanding of its capacity is very important for the practical implementation of optimal fault-tolerant architectures. It is known that stabilizer codes support a natural set of gates that can be more easily implemented by teleportation than any other gates. These gates belong to the so called $\mathcal{C}_k$ hierarchy introduced by Gottesman and Chuang (Nature \textbf{402}, 390). Moreover, a subset of $\mathcal{C}_k$ gates, called semi-Clifford operations, can be implemented by an even simpler architecture than the traditional teleportation setup (Phys. Rev. \textbf{A62}, 052316). However, the precise set of gates in $\mathcal{C}_k$ remains unknown, even for a fixed number of qubits $n$, which prevents us from knowing exactly what teleportation is capable of. In this paper we study the structure of $\mathcal{C}_k$ in terms of semi-Clifford operations, which send by conjugation at least one maximal abelian subgroup of the $n$-qubit Pauli group into another one. We show that for $n=1,2$, all the $\mathcal{C}_k$ gates are semi-Clifford, which is also true for $\{n=3,k=3\}$. However, this is no longer true for $\{n>2,k>3\}$. To measure the capability of this teleportation primitive, we introduce a quantity called `teleportation depth', which characterizes how many teleportation steps are necessary, on average, to implement a given gate. We calculate upper bounds for teleportation depth by decomposing gates into both semi-Clifford $\mathcal{C}_k$ gates and those $\mathcal{C}_k$ gates beyond semi-Clifford operations, and compare their efficiency.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 04:59:28 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 19:08:10 GMT" } ]
2010-03-10T00:00:00
[ [ "Zeng", "Bei", "" ], [ "Chen", "Xie", "" ], [ "Chuang", "Isaac L.", "" ] ]
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712.2085
Adam Sikora
Andrew Hassell and Adam Sikora
Riesz transforms in one dimension
23 pages
null
null
null
math.AP math.CA
null
We study the boundedness on $L^p$ of the Riesz transform $\nabla L^{-1/2}$, where $L$ is one of several operators defined on $\R$ or $\R_+$, endowed with the measure $r^{d-1} dr$, $d > 1$, where $dr$ is Lebesgue measure. For integer $d$, this mimics the measure on Euclidean $d$-dimensional space, and in this case our setup is equivalent to looking at the Laplacian acting on radial functions on Euclidean space or variations of Euclidean space such as the exterior of a sphere (with either Dirichlet or Neumann boundary conditions), or the connected sum of two copies of $\R^d$. In this way we illuminate some recent results on the Riesz transform on asymptotically Euclidean manifolds. We are however interested in all real values of $d > 1$, and another goal of our analysis is to study the range of boundedness as a function of $d$; it is particularly interesting to see the behaviour as $d$ crosses 2. For example, in one of our cases which models radial functions on the connected sum of two copies of $\R^d$, the upper threshold for $L^p$ boundedness is $p=d$ for $d \ge 2$ and $p=d/(d-1)$ for $d < 2$. Only in the case $d=2$ is the Riesz transform actually bounded on $L^p$ when $p$ is equal to the upper threshold. We also study the Riesz transform when we have an inverse square potential, or a delta function potential; these cases provide a simple model for recent results of the first author and Guillarmou. Finally we look at the Hodge projector in a slightly more general setup.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 02:47:36 GMT" } ]
2007-12-14T00:00:00
[ [ "Hassell", "Andrew", "" ], [ "Sikora", "Adam", "" ] ]
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712.2086
Jean Perez
Jean Carlos Perez and Stanislav Boldyrev
On weak and strong magnetohydrodynamic turbulence
4 pages, 2 figures
Astrophys.J.672:L61-L64,2008
10.1086/526342
null
astro-ph nlin.CD physics.flu-dyn physics.plasm-ph
null
Recent numerical and observational studies contain conflicting reports on the spectrum of magnetohydrodynamic turbulence. In an attempt to clarify the issue we investigate anisotropic incompressible magnetohydrodynamic turbulence with a strong guide field $B_0$. We perform numerical simulations of the reduced MHD equations in a special setting that allows us to elucidate the transition between weak and strong turbulent regimes. Denote $k_{\|}$, $k_\perp$ characteristic field-parallel and field-perpendicular wavenumbers of the fluctuations, and $b_{\lambda}$ the fluctuating field at the scale $\lambda\sim 1/k_{\perp}$. We find that when the critical balance condition, $k_{\|}B_0\sim k_{\perp} b_{\lambda}$, is satisfied, the turbulence is strong, and the energy spectrum is $E(k_{\perp})\propto k^{-3/2}_{\perp}$. As the $k_{\|}$ width of the spectrum increases, the turbulence rapidly becomes weaker, and in the limit $k_{\|}B_0\gg k_{\perp} b_{\lambda}$, the spectrum approaches $E(k_{\perp})\propto k_{\perp}^{-2}$. The observed sensitivity of the spectrum to the balance of linear and nonlinear interactions may explain the conflicting numerical and observational findings where this balance condition is not well controlled.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 02:49:55 GMT" } ]
2010-11-11T00:00:00
[ [ "Perez", "Jean Carlos", "" ], [ "Boldyrev", "Stanislav", "" ] ]
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712.2087
Yuli Rudyak
Alexander N. Dranishnikov and Yuli B. Rudyak
On the Berstein-Svarc Theorem in dimension 2
Latex, 8 pages, one more theorem is added
null
10.1017/S0305004108001904
null
math.AT
null
We prove that for any group of the cohomological dimension $n$ the $n$th power of the Berstein class of the group is nontrivial. This allows to prove the following Berstein-Svarc theorem for all $n$: Theorem. For a connected complex $X$ with $\dim X=\cat X=n$, the $n$th power of the Berstein class of $X$ is nontrivial. Previously it was known for $n\ge 3$. We also prove that, for every map $f: M \to N$ of degree $\pm 1$ of closed orientable manifolds, the fundamental group of $N$ is free provided that the fundamental group of $M$ is.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 03:13:19 GMT" }, { "version": "v2", "created": "Thu, 21 Feb 2008 15:20:47 GMT" } ]
2009-11-13T00:00:00
[ [ "Dranishnikov", "Alexander N.", "" ], [ "Rudyak", "Yuli B.", "" ] ]
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712.2088
Byron Bell
Byron E. Bell
Financial Variables Effect on the U.S. Gross Private Domestic Investment (GPDI) 1959-2001
null
null
null
null
q-fin.GN stat.AP
null
I studied what role the US stock markets and money markets have possibly played in the Gross Private Domestic Investment (GPDI) of the United States from the year 1959 to the year 2001, Gross Private Domestic Investment refers to the total amount of investment spending by businesses and firms located within the borders of a nation. It includes both the values of the purchases of non-residential fixed investment, which include capital goods used for production, and the values of the purchases of residential fixed investment, which include construction spending for factories or offices. And I created a Multiple Linear Regression Model of the GDPI. To see if companies and private citizens use the stock market and money markets as a way of financing capital projects (business ventures, buying commercial and noncommercial property, etc). Keywords: Gross Private Domestic Investment, Pearson Correlation, SP 500, TB3
[ { "version": "v1", "created": "Thu, 13 Dec 2007 04:05:17 GMT" } ]
2008-12-02T00:00:00
[ [ "Bell", "Byron E.", "" ] ]
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712.2089
Yaroslav Kartashov
Yaroslav V. Kartashov, Victor V. Vysloukh, Lluis Torner
Highly-asymmetric soliton complexes in parabolic optical lattices
12 pages, 4 figures, to appear in Optics Letters
Optics Letters 33, 141 (2008)
10.1364/OL.33.000141
null
physics.optics nlin.PS
null
We introduce multipole soliton complexes in optical lattices induced by nondiffracting parabolic beams. Despite the symmetry-breaking dictated by the curvature of the lattice channels, we find that complex, asymmetric higher-order states can be stable. The unique topology of parabolic lattices affords new types of soliton motion: single solitons launched into the lattice with nonzero transverse momentum perform periodic oscillations along parabolic paths.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:39:29 GMT" } ]
2009-11-13T00:00:00
[ [ "Kartashov", "Yaroslav V.", "" ], [ "Vysloukh", "Victor V.", "" ], [ "Torner", "Lluis", "" ] ]
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712.209
Xiaopeng Zhao
Xiaopeng Zhao
Indeterminacy of Spatiotemporal Cardiac Alternans
20 pages, 10 figures, to be published in Phys. Rev. E
null
10.1103/PhysRevE.78.011902
null
physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cardiac alternans, a beat-to-beat alternation in action potential duration (at the cellular level) or in ECG morphology (at the whole heart level), is a marker of ventricular fibrillation, a fatal heart rhythm that kills hundreds of thousands of people in the US each year. Investigating cardiac alternans may lead to a better understanding of the mechanisms of cardiac arrhythmias and eventually better algorithms for the prediction and prevention of such dreadful diseases. In paced cardiac tissue, alternans develops under increasingly shorter pacing period. Existing experimental and theoretical studies adopt the assumption that alternans in homogeneous cardiac tissue is exclusively determined by the pacing period. In contrast, we find that, when calcium-driven alternans develops in cardiac fibers, it may take different spatiotemporal patterns depending on the pacing history. Because there coexist multiple alternans solutions for a given pacing period, the alternans pattern on a fiber becomes unpredictable. Using numerical simulation and theoretical analysis, we show that the coexistence of multiple alternans patterns is induced by the interaction between electrotonic coupling and an instability in calcium cycling.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 03:20:42 GMT" }, { "version": "v2", "created": "Wed, 18 Jun 2008 05:01:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Zhao", "Xiaopeng", "" ] ]
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712.2091
Malwina J. Luczak
Malwina J. Luczak and Colin McDiarmid
Asymptotic distributions and chaos for the supermarket model
Published in Electronic Journal of Probability
EJP, vol. 12 (2007), 75--99
null
null
math.PR
null
In the supermarket model there are n queues, each with a unit rate server. Customers arrive in a Poisson process at rate \lambda n, where 0<\lambda <1. Each customer chooses d > 2 queues uniformly at random, and joins a shortest one. It is known that the equilibrium distribution of a typical queue length converges to a certain explicit limiting distribution as n -> oo. We quantify the rate of convergence by showing that the total variation distance between the equilibrium distribution and the limiting distribution is essentially of order n^{-1}; and we give a corresponding result for systems starting from quite general initial conditions (not in equilibrium). Further, we quantify the result that the systems exhibit chaotic behaviour: we show that the total variation distance between the joint law of a fixed set of queue lengths and the corresponding product law is essentially of order at most n^{-1}.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 18:17:03 GMT" } ]
2007-12-14T00:00:00
[ [ "Luczak", "Malwina J.", "" ], [ "McDiarmid", "Colin", "" ] ]
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712.2092
Dipendra Prasad
Dipendra Prasad and Ramin Takloo-Bighash
Bessel models for $GSp(4)$
null
null
null
null
math.NT math.RT
null
Methods of theta correspondence are used to analyze local and global Bessel models for $GSp(4)$ proving a conjecture of Gross and Prasad which describes these models in terms of local epsilon factors in the local case, and the non-vanishing of central critical $L$-value in the global case.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 04:10:22 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 00:08:00 GMT" } ]
2007-12-14T00:00:00
[ [ "Prasad", "Dipendra", "" ], [ "Takloo-Bighash", "Ramin", "" ] ]
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712.2093
Andrei Kryjevski
Andrei Kryjevski
Effective Lagrangian of unitary Fermi gas from $\varepsilon$ expansion
17 pages, 4 figures
null
10.1103/PhysRevA.78.043610
null
nucl-th cond-mat.other
null
Using $\varepsilon$ expansion technique proposed in \cite{Nishida:2006br} we derive an effective Lagrangian (Ginzburg-Landau-like functional) of the degenerate unitary Fermi gas to the next-to-leading (NLO) order in $\varepsilon.$ It is demonstrated that for many realistic situations it is sufficient to retain leading order (LO) terms in the derivative expansion. The functional is used to study vortex structure in the symmetric gas, and interface between normal and superfluid phases in the polarized gas. The resulting surface free energy is about four times larger than the value previously quoted in the literature.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 04:28:36 GMT" } ]
2009-11-13T00:00:00
[ [ "Kryjevski", "Andrei", "" ] ]
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712.2094
Zachary Abel
Timothy G. Abbott, Zachary Abel, David Charlton, Erik D. Demaine, Martin L. Demaine, Scott D. Kominers
Hinged Dissections Exist
22 pages, 14 figures
Proceedings of the Twenty-fourth Annual Symposium on Computational Geometry (2008): 110-119.
10.1145/1377676.1377695
null
cs.CG
null
We prove that any finite collection of polygons of equal area has a common hinged dissection. That is, for any such collection of polygons there exists a chain of polygons hinged at vertices that can be folded in the plane continuously without self-intersection to form any polygon in the collection. This result settles the open problem about the existence of hinged dissections between pairs of polygons that goes back implicitly to 1864 and has been studied extensively in the past ten years. Our result generalizes and indeed builds upon the result from 1814 that polygons have common dissections (without hinges). We also extend our common dissection result to edge-hinged dissections of solid 3D polyhedra that have a common (unhinged) dissection, as determined by Dehn's 1900 solution to Hilbert's Third Problem. Our proofs are constructive, giving explicit algorithms in all cases. For a constant number of planar polygons, both the number of pieces and running time required by our construction are pseudopolynomial. This bound is the best possible, even for unhinged dissections. Hinged dissections have possible applications to reconfigurable robotics, programmable matter, and nanomanufacturing.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 04:43:10 GMT" } ]
2008-06-12T00:00:00
[ [ "Abbott", "Timothy G.", "" ], [ "Abel", "Zachary", "" ], [ "Charlton", "David", "" ], [ "Demaine", "Erik D.", "" ], [ "Demaine", "Martin L.", "" ], [ "Kominers", "Scott D.", "" ] ]
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712.2095
Xin Wan
Xin Wan, Zi-Xiang Hu, E. H. Rezayi, Kun Yang
Fractional quantum Hall effect at $\nu = 5/2$: Ground states, non-Abelian quasiholes, and edge modes in a microscopic model
15 pages, 9 figures; Estimate of e/4 quasiparticle/hole coherence length when propagating along the edge modified in response to a recent revision of Ref. 25, and minor changes elsewhere
Phys. Rev. B 77, 165316 (2008)
10.1103/PhysRevB.77.165316
null
cond-mat.mes-hall cond-mat.str-el
null
We present a comprehensive numerical study of a microscopic model of the fractional quantum Hall system at filling fraction $\nu = 5/2$, based on the disc geometry. Our model includes Coulomb interaction and a semi-realistic confining potential. We also mix in some three-body interaction in some cases to help elucidate the physics. We obtain a phase diagram, discuss the conditions under which the ground state can be described by the Moore-Read state, and study its competition with neighboring stripe phases. We also study quasihole excitations and edge excitations in the Moore-Read--like state. From the evolution of edge spectrum, we obtain the velocities of the charge and neutral edge modes, which turn out to be very different. This separation of velocities is a source of decoherence for a non-Abelian quasihole/quasiparticle (with charge $\pm e/4$) when propagating at the edge; using numbers obtained from a specific set of parameters we estimate the decoherence length to be around four microns. This sets an upper bound for the separation of the two point contacts in a double point contact interferometer, designed to detect the non-Abelian nature of such quasiparticles. We also find a state that is a potential candidate for the recently proposed anti-Pfaffian state. We find the speculated anti-Pfaffian state is favored in weak confinement (smooth edge) while the Moore-Read Pfaffian state is favored in strong confinement (sharp edge).
[ { "version": "v1", "created": "Thu, 13 Dec 2007 05:23:47 GMT" }, { "version": "v2", "created": "Thu, 3 Jan 2008 12:35:40 GMT" }, { "version": "v3", "created": "Thu, 29 May 2008 14:50:31 GMT" } ]
2009-11-13T00:00:00
[ [ "Wan", "Xin", "" ], [ "Hu", "Zi-Xiang", "" ], [ "Rezayi", "E. H.", "" ], [ "Yang", "Kun", "" ] ]
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712.2096
Ashis Mandal
Ashis Mandal
An Example of Constructing Versal Deformation for Leibniz Algebras
22 pages, 1 figure
null
null
null
math.QA
null
In this work we compute a versal deformation of the three dimensional nilpotent Leibniz algebra over $\mathbb{C}$, defined by the nontrivial brackets $[e_1,e_3]=e_2$ and $[e_3,e_3]=e_1$.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 06:20:28 GMT" } ]
2007-12-14T00:00:00
[ [ "Mandal", "Ashis", "" ] ]
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712.2097
Maurice Courbage
Maurice Courbage (MSC), V.I. Nekorkin (IAPRAS), L.V. Vdovin (IAPRAS)
Chaotic oscillations in a map-based model of neural activity
null
null
10.1063/1.2795435
null
q-bio.NC nlin.CD
null
We propose a discrete time dynamical system (a map) as phenomenological model of excitable and spiking-bursting neurons. The model is a discontinuous two-dimensional map. We find condition under which this map has an invariant region on the phase plane, containing chaotic attractor. This attractor creates chaotic spiking-bursting oscillations of the model. We also show various regimes of other neural activities (subthreshold oscillations, phasic spiking etc.) derived from the proposed model.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 06:33:59 GMT" } ]
2009-11-13T00:00:00
[ [ "Courbage", "Maurice", "", "MSC" ], [ "Nekorkin", "V. I.", "", "IAPRAS" ], [ "Vdovin", "L. V.", "", "IAPRAS" ] ]
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712.2098
Mathieu Bouville
Mathieu Bouville and Rajeev Ahluwalia
Phase field simulations of coupled phase transformations in ferroelastic-ferroelastic nanocomposites
8 pages, 15 figures
Physical Review B 79, 094110 (2009)
10.1103/PhysRevB.79.094110
null
cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use phase field simulations to study composites made of two different ferroelastics (e.g., two types of martensite). The deformation of one material due to a phase transformation can elastically affect the other constituent and induce it to transform as well. We show that the phase transformation can then occur above its normal critical temperature and even higher above this temperature in nanocomposites than in bulk composites. Microstructures depend on temperature, on the thickness of the layers, and on the crystal structure of the two constituents -- certain nanocomposites exhibit a great diversity of microstructures not found in bulk composites. Also, the periodicity of the martensite twins may vary over 1 order of magnitude based on geometry. keywords: Ginzburg-Landau, martensitic transformation, multi-ferroics, nanostructure, shape-memory alloy
[ { "version": "v1", "created": "Thu, 13 Dec 2007 06:34:41 GMT" }, { "version": "v2", "created": "Wed, 25 Mar 2009 13:34:06 GMT" } ]
2009-03-25T00:00:00
[ [ "Bouville", "Mathieu", "" ], [ "Ahluwalia", "Rajeev", "" ] ]
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712.2099
Jocelyne Troccaz
V. Daanen (TIMC), J. Gastaldo, J. Y. Giraud, P. Fourneret, J. L. Descotes, M. Bolla, D. Collomb, Jocelyne Troccaz (TIMC)
MRI/TRUS data fusion for brachytherapy
null
International Journal of Medical Robotics and Computer Assisted Surgery 2, 3 (2006) 256-61
10.1002/rcs.95
null
cs.OH
null
BACKGROUND: Prostate brachytherapy consists in placing radioactive seeds for tumour destruction under transrectal ultrasound imaging (TRUS) control. It requires prostate delineation from the images for dose planning. Because ultrasound imaging is patient- and operator-dependent, we have proposed to fuse MRI data to TRUS data to make image processing more reliable. The technical accuracy of this approach has already been evaluated. METHODS: We present work in progress concerning the evaluation of the approach from the dosimetry viewpoint. The objective is to determine what impact this system may have on the treatment of the patient. Dose planning is performed from initial TRUS prostate contours and evaluated on contours modified by data fusion. RESULTS: For the eight patients included, we demonstrate that TRUS prostate volume is most often underestimated and that dose is overestimated in a correlated way. However, dose constraints are still verified for those eight patients. CONCLUSIONS: This confirms our initial hypothesis.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 06:43:24 GMT" } ]
2007-12-14T00:00:00
[ [ "Daanen", "V.", "", "TIMC" ], [ "Gastaldo", "J.", "", "TIMC" ], [ "Giraud", "J. Y.", "", "TIMC" ], [ "Fourneret", "P.", "", "TIMC" ], [ "Descotes", "J. L.", "", "TIMC" ], [ "Bolla", "M.", "", "TIMC" ], [ "Collomb", "D.", "", "TIMC" ], [ "Troccaz", "Jocelyne", "", "TIMC" ] ]
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712.21
Jocelyne Troccaz
Jocelyne Troccaz (TIMC), Michael Baumann (TIMC), Peter Berkelman (TIMC), Philippe Cinquin (TIMC), Vincent Daanen (TIMC), Antoine Leroy (TIMC), Maud Marchal (TIMC), Yohan Payan (TIMC), Emmanuel Promayon (TIMC), Sandrine Voros (TIMC), St\'ephane Bart (TIMC), Michel Bolla, Emmanuel Chartier-Kastler, Jean-Luc Descotes, Andr\'ee Dusserre, Jean-Yves Giraud, Jean-Alexandre Long (TIMC), Ronan Moalic, Pierre Mozer (TIMC)
Medical image computing and computer-aided medical interventions applied to soft tissues. Work in progress in urology
null
Proceedings of the IEEE 94, 9 (2006) 1665-1677
null
null
cs.OH cs.RO
null
Until recently, Computer-Aided Medical Interventions (CAMI) and Medical Robotics have focused on rigid and non deformable anatomical structures. Nowadays, special attention is paid to soft tissues, raising complex issues due to their mobility and deformation. Mini-invasive digestive surgery was probably one of the first fields where soft tissues were handled through the development of simulators, tracking of anatomical structures and specific assistance robots. However, other clinical domains, for instance urology, are concerned. Indeed, laparoscopic surgery, new tumour destruction techniques (e.g. HIFU, radiofrequency, or cryoablation), increasingly early detection of cancer, and use of interventional and diagnostic imaging modalities, recently opened new challenges to the urologist and scientists involved in CAMI. This resulted in the last five years in a very significant increase of research and developments of computer-aided urology systems. In this paper, we propose a description of the main problems related to computer-aided diagnostic and therapy of soft tissues and give a survey of the different types of assistance offered to the urologist: robotization, image fusion, surgical navigation. Both research projects and operational industrial systems are discussed.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 06:45:28 GMT" } ]
2007-12-14T00:00:00
[ [ "Troccaz", "Jocelyne", "", "TIMC" ], [ "Baumann", "Michael", "", "TIMC" ], [ "Berkelman", "Peter", "", "TIMC" ], [ "Cinquin", "Philippe", "", "TIMC" ], [ "Daanen", "Vincent", "", "TIMC" ], [ "Leroy", "Antoine", "", "TIMC" ], [ "Marchal", "Maud", "", "TIMC" ], [ "Payan", "Yohan", "", "TIMC" ], [ "Promayon", "Emmanuel", "", "TIMC" ], [ "Voros", "Sandrine", "", "TIMC" ], [ "Bart", "Stéphane", "", "TIMC" ], [ "Bolla", "Michel", "", "TIMC" ], [ "Chartier-Kastler", "Emmanuel", "", "TIMC" ], [ "Descotes", "Jean-Luc", "", "TIMC" ], [ "Dusserre", "Andrée", "", "TIMC" ], [ "Giraud", "Jean-Yves", "", "TIMC" ], [ "Long", "Jean-Alexandre", "", "TIMC" ], [ "Moalic", "Ronan", "", "TIMC" ], [ "Mozer", "Pierre", "", "TIMC" ] ]
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712.2101
X.R. Wang
X. R. Wang, P. Yan, J. Lu, and C. He
Euler equation of the optimal trajectory for the fastest magnetization reversal of nano-magnetic structures
null
null
10.1209/0295-5075/84/27008
null
cond-mat.mes-hall cond-mat.mtrl-sci
null
Based on the modified Landau-Lifshitz-Gilbert equation for an arbitrary Stoner particle under an external magnetic field and a spin-polarized electric current, differential equations for the optimal reversal trajectory, along which the magnetization reversal is the fastest one among all possible reversal routes, are obtained. We show that this is a Euler-Lagrange problem with constrains. The Euler equation of the optimal trajectory is useful in designing a magnetic field pulse and/or a polarized electric current pulse in magnetization reversal for two reasons. 1) It is straightforward to obtain the solution of the Euler equation, at least numerically, for a given magnetic nano-structure characterized by its magnetic anisotropy energy. 2) After obtaining the optimal reversal trajectory for a given magnetic nano-structure, finding a proper field/current pulse is an algebraic problem instead of the original nonlinear differential equation.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 07:02:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Wang", "X. R.", "" ], [ "Yan", "P.", "" ], [ "Lu", "J.", "" ], [ "He", "C.", "" ] ]
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712.2102
Enrique Pardo
G. Aranda-Pino, E. Pardo, M. Siles-Molina
Prime spectrum and primitive Leavitt path algebras
null
null
null
null
math.RA
null
In this paper a bijection between the set of prime ideals of a Leavitt path algebra $L_K(E)$ and a certain set which involves maximal tails in $E$ and the prime spectrum of $K[x,x^{-1}]$ is established. Necessary and sufficient conditions on the graph $E$ so that the Leavitt path algebra $L_K(E)$ is primitive are also found.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 07:03:18 GMT" } ]
2007-12-14T00:00:00
[ [ "Aranda-Pino", "G.", "" ], [ "Pardo", "E.", "" ], [ "Siles-Molina", "M.", "" ] ]
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712.2103
Tomohiro Matsuda
Tomohiro Matsuda
Hilltop Curvatons
15 pages, added references
Phys.Lett.B659:783-788,2008
10.1016/j.physletb.2007.12.008
null
hep-ph astro-ph hep-th
null
We study ``hilltop'' curvatons that evolve on a convex potential. Hilltop curvatons evolving on the Hubble-induced potential are generic if supergravity is assumed in the theory. We do not consider curvatons whose potential is protected from $O(H)$ corrections, where $H$ is the Hubble parameter. We assume that the effective mass of a curvaton is expressed as $m_\sigma = c H$, where the coefficient varies within $0.2 \le c \le 5$ depending on the circumstances. A negative mass term may lead to enhancement of curvaton fluctuation, which has a significant impact on the energy bound for low-scale inflation. Using a simple curvaton model and following the conventional curvaton hypothesis, we demonstrate the generality of this enhancement.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 07:19:51 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 08:56:20 GMT" } ]
2008-11-26T00:00:00
[ [ "Matsuda", "Tomohiro", "" ] ]
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712.2104
Andrew Putman
Joan S. Birman, Dennis Johnson, Andrew Putman
Symplectic Heegaard splittings and linked abelian groups
78 pages, 1 figure, final version; to appear in "Groups of Diffeomorphisms"
in "Groups of Diffeomorphisms", Adv. Stud. Pure Math., 52, Math. Soc. Japan, Tokyo, 2008, 135-220
10.2969/aspm/05210135
null
math.GT
null
Let $f$ be the gluing map of a Heegaard splitting of a 3-manifold $W$. The goal of this paper is to determine the information about $W$ contained in the image of $f$ under the symplectic representation of the mapping class group. We prove three main results. First, we show that the first homology group of the three manifold together with Seifert's linking form provides a complete set of stable invariants. Second, we give a complete, computable set of invariants for these linking forms. Third, we show that a slight augmentation of Birman's determinantal invariant for a Heegaard splitting gives a complete set of unstable invariants.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 07:30:37 GMT" }, { "version": "v2", "created": "Mon, 21 Apr 2008 16:43:22 GMT" } ]
2020-06-08T00:00:00
[ [ "Birman", "Joan S.", "" ], [ "Johnson", "Dennis", "" ], [ "Putman", "Andrew", "" ] ]
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712.2105
Flaminio Flamini
Alberto Calabri, Ciro Ciliberto, Flaminio Flamini, Rick Miranda
Non-special scrolls with general moduli
24 pages, Latex2e, Submitted preprint
null
null
null
math.AG
null
In this paper we study smooth, non-special scrolls S of degree d, genus g, with general moduli. In particular, we study the scheme of unisecant curves of a given degree on S. Our approach is mostly based on degeneration techniques.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 07:53:09 GMT" } ]
2007-12-14T00:00:00
[ [ "Calabri", "Alberto", "" ], [ "Ciliberto", "Ciro", "" ], [ "Flamini", "Flaminio", "" ], [ "Miranda", "Rick", "" ] ]
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712.2106
Flaminio Flamini
A. Calabri, C. Ciliberto, F. Flamini, R. Miranda
Brill-Noether theory and non-special scrolls
16 pages, Latex2e, Submitted preprint
null
null
null
math.AG
null
In this paper we study the Brill-Noether theory of sub-line bundles of a general, stable rank-two vector bundle on a curve C with general moduli. We relate this theory to the geometry of unisecant curves on smooth, non-special scrolls with hyperplane sections isomorphic to C. Most of our results are based on degeneration techniques.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 08:01:10 GMT" } ]
2007-12-14T00:00:00
[ [ "Calabri", "A.", "" ], [ "Ciliberto", "C.", "" ], [ "Flamini", "F.", "" ], [ "Miranda", "R.", "" ] ]
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712.2107
Matthias Vojta
Andreas Hackl, Matthias Vojta
Kondo volume collapse, Kondo breakdown, and Fermi surface transitions in heavy-fermion metals
11 pages, 7 figs; (v2) small changes, additional refs, final version as published
Phys. Rev. B 77, 134439 (2008)
10.1103/PhysRevB.77.134439
null
cond-mat.str-el
null
The unconventional critical behavior near magnetic quantum phase transitions in various heavy-fermion metals, apparently inconsistent with the standard spin-density-wave scenario, has triggered proposals on the breakdown of the Kondo effect at the critical point. Here we investigate, within one specific scenario, the fate of such a zero-temperature transition upon coupling of the electronic to lattice degrees of freedom. We study a Kondo-Heisenberg model with volume-dependent Kondo coupling -- this model displays both Kondo volume collapse and Kondo-breakdown transitions, as well as Lifshitz transitions associated with a change of the Fermi-surface topology. Within a large-N treatment, we find that the Lifshitz transition tends to merge with the Kondo volume collapse and hence becomes first order, whereas the Kondo breakdown transition remains of second order except for very soft lattices. Interesting physics emerges at the zero-temperature endpoint of the Kondo volume collapse: For electrons in two space dimensions, this endpoint is located at the Lifshitz line for a large range of parameters, thus two continuous quantum phase transitions coincide without fine tuning. We analyze the effective Landau theory for such a situation and discuss critical exponents. Finally, we relate our findings to current heavy-fermion experiments.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:03:09 GMT" }, { "version": "v2", "created": "Fri, 25 Apr 2008 11:15:09 GMT" } ]
2008-04-25T00:00:00
[ [ "Hackl", "Andreas", "" ], [ "Vojta", "Matthias", "" ] ]
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712.2108
Yong Fu
Simon Fu
An Illustrated Introduction to the Basic Biological Principles
Content changed
null
null
null
q-bio.PE q-bio.GN q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Both external environmental selection and internal lower-level evolution are essential for an integral picture of evolution. This paper proposes that the division of internal evolution into DNA/RNA pattern formation (genotype) and protein functional action (phenotype) resolves a universal conflict between fitness and evolvability. Specifically, this paper explains how this universal conflict drove the emergence of genotype-phenotype division, why this labor division is responsible for the extraordinary complexity of life, and how the specific ways of genotype-phenotype mapping in the labor division determine the paths and forms of evolution and development.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 08:23:38 GMT" }, { "version": "v2", "created": "Sat, 15 Dec 2007 08:20:21 GMT" }, { "version": "v3", "created": "Wed, 2 Jan 2008 08:20:01 GMT" }, { "version": "v4", "created": "Mon, 16 Mar 2009 02:56:16 GMT" }, { "version": "v5", "created": "Mon, 14 Dec 2009 01:18:52 GMT" } ]
2009-12-14T00:00:00
[ [ "Fu", "Simon", "" ] ]
[ 0.0584445894, 0.1431316584, 0.0984092727, 0.0445220582, 0.0394137911, -0.0611990467, 0.1291089505, 0.0117502669, -0.0750714988, -0.0346310474, 0.0731183365, -0.0017653571, -0.0202828273, 0.0550891608, 0.0870408714, -0.0658065081, 0.0448976643, -0.0114372605, 0.0182295032, 0.0812815502, 0.03037416, -0.0885433033, 0.1429313272, 0.1113802642, -0.0297982264, -0.1059715077, 0.0218603797, 0.1438327879, 0.0235380959, -0.0480026901, 0.0431698672, -0.0025510036, -0.0234629735, -0.0016307643, -0.1055708602, 0.0504316203, 0.0424436927, 0.01235124, -0.0283458773, 0.0817823634, 0.0251782499, -0.118992582, -0.0639034286, 0.0901459008, -0.1036677808, -0.0269686468, -0.0397893973, -0.0683606416, -0.011274497, -0.0015775532, -0.0931507573, -0.0515334047, 0.1514451057, -0.0394638702, -0.0919988975, 0.0738194734, -0.1581559628, -0.0331035778, -0.0807807371, 0.0558403768, 0.0860893354, 0.0220356639, -0.0852379575, 0.077024661, -0.0965562686, -0.0178789366, -0.1329151243, 0.0567919165, 0.0212594066, -0.0283709168, 0.0705141276, -0.0492547154, 0.0067546819, 0.0782266036, 0.0765238479, -0.0086515024, -0.0309500918, 0.0745706931, -0.0605479926, 0.0971572474, -0.0142355394, 0.022361191, 0.0707144514, -0.0523847826, -0.0631522089, 0.0552894846, 0.00428819, -0.0640536696, -0.0634026155, -0.0995611325, -0.0269436073, -0.0692620948, -0.1195935607, 0.0232376084, 0.1150862649, 0.007994188, 0.010128893, 0.0144108236, -0.0057280203, 0.0645043999, 0.0005066794, -0.0406157337, -0.0319517143, -0.0345058478, 0.0159508158, -0.0647548065, -0.0419178419, 0.0029594772, -0.1366211176, -0.0469009057, -0.0490543917, 0.0781264454, 0.1094771847, 0.0788776577, -0.0942525417, -0.0442466103, -0.106973134, -0.0236507785, -0.0283458773, 0.0028843556, 0.0545382686, -0.0453233533, -0.0498556904, 0.0384872891, -0.0016057238, -0.0848873854, -0.0288967676, 0.0359331556, -0.0076561412, -0.0217977781, 0.0507571474, 0.0464000963, -0.0351318605, 0.0056904596, -0.1223980933, -0.0572426431, 0.0004800739, 0.0753219053, -0.0195316114, -0.0085701207, -0.0446472615, 0.0292723756, -0.0122197773, -0.0008036444, 0.131913498, 0.0525350273, -0.0540875383, 0.0219355021, -0.0294726994, 0.0235506166, 0.0774253085, 0.0153874038, -0.0020314127, -0.0615996979, 0.0083134547, -0.0429695435, 0.0277699437, 0.0574930497, -0.0037466888, 0.0430196263, 0.0795787945, 0.0000573193, -0.0251031276, 0.0606481582, -0.0085638603, -0.0516335666, -0.0374856703, -0.00759354, -0.0513831601, 0.102115266, -0.0155000864, 0.0247150008, -0.0400147624, 0.0051739989, 0.0137722902, -0.0217226576, -0.0768243372, -0.1389248371, -0.0972574055, -0.0254912563, 0.0307247266, 0.04041541, 0.0292473361, -0.0269185659, -0.0144609045, 0.0020048071, 0.0469760299, 0.0021691357, -0.007875246, -0.1197938845, -0.0087141031, 0.0143231815, 0.0000651934, -0.0339048728, 0.1179909632, -0.0338798314, 0.1352188438, -0.0407158956, 0.050732106, 0.1175903156, 0.0701635554, 0.0355575494, 0.0889439508, 0.0009804931, -0.0890441164, 0.0118692098, 0.0246273577, 0.026067188, -0.0899956524, 0.0155251268, 0.0438459627, -0.0336294286, -0.0296980646, 0.0189681984, -0.0383370481, -0.03365447, -0.0023193788, 0.0476521216, -0.0071490705, 0.0964060277, -0.0349565744, -0.0729680955, 0.1078745872, 0.0345809683, -0.0307748076, -0.0291722137, 0.006131799, -0.0831846297, 0.045799125, -0.0861894935, 0.0269436073, 0.0898454115, 0.0147613911, -0.0320769139, -0.0720666349, -0.0469259471, -0.0866903067, 0.0666078031, 0.0040565655, 0.0147363497, -0.0869907886, 0.05794378, -0.0831846297, 0.1286081523, 0.0200825036, 0.0241265483, -0.0380866416, -0.0423184894, -0.0643040761, -0.0249528848, 0.0572426431, 0.0133841615, 0.1563530564, 0.0225740355, 0.0479025282, 0.0025040526 ]
712.2109
Strecka Jozef
J. Strecka, M. Hagiwara, P. Balaz, M. Jascur, Y. Narumi, S. Kimura, J. Kuchar, and K. Kindo
Breakdown of an intermediate plateau in the magnetization process of anisotropic spin-1 Heisenberg dimer: theory vs. experiment
16 pages, 6 figures, preprint submitted to Physica B
Physica B 403 (2008) 3146-3153
10.1016/j.physb.2008.03.025
null
cond-mat.mtrl-sci cond-mat.stat-mech
null
The magnetization process of the spin-1 Heisenberg dimer model with axial and rhombic single-ion anisotropy terms is particularly investigated in connection with recent experimental high-field measurements performed on the single-crystal sample of the homodinuclear nickel(II) compound [Ni2(Medpt)2(ox)(H2O)2](ClO4)2.2H2O (Medpt=methyl-bis(3-aminopropyl)amine). The results obtained from the exact numerical diagonalization reveal a striking magnetization process with a marked spatial dependence on the applied magnetic field for arbitrary but non-zero single-ion anisotropy. It is demonstrated that the field range, which corresponds to an intermediate magnetization plateau emerging at a half of the saturation magnetization, basically depends on single-ion anisotropy terms as well as a spatial orientation of the applied field. The breakdown of the intermediate magnetization plateau is discussed at length in relation to the single-ion anisotropy strength.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 08:40:32 GMT" }, { "version": "v2", "created": "Mon, 18 Feb 2008 13:17:30 GMT" } ]
2009-02-18T00:00:00
[ [ "Strecka", "J.", "" ], [ "Hagiwara", "M.", "" ], [ "Balaz", "P.", "" ], [ "Jascur", "M.", "" ], [ "Narumi", "Y.", "" ], [ "Kimura", "S.", "" ], [ "Kuchar", "J.", "" ], [ "Kindo", "K.", "" ] ]
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712.211
Steffen Mieske
Steffen Mieske, Helmut Jerjen
Near-field cosmology with the VLT
5 pages, 3 figures, to appear in the proceedings of the ESO workshop "Science with the VLT in the ELT era", Springer Astrophysics and Space Science Proceedings, editor A. Moorwood
null
null
null
astro-ph
null
With the arrival of wide-field imagers on medium-size telescopes (e.g. SkyMapper, Pan-STARRS) and the future co-existence of LSST with the E-ELT, it is worthwhile to evaluate the scientific potential of a CCD camera with ~1 degree FOV for the VLT. Here we discuss the role that such an instrument could play in resolving persisting fundamental problems in "near-field cosmology".
[ { "version": "v1", "created": "Thu, 13 Dec 2007 09:07:51 GMT" } ]
2007-12-14T00:00:00
[ [ "Mieske", "Steffen", "" ], [ "Jerjen", "Helmut", "" ] ]
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712.2111
Peter Tuthill
Peter Tuthill, John Monnier, Nicholas Lawrance, William Danchi, Stan Owocki, Kenneth Gayley
The prototype colliding-wind pinwheel WR 104
35 pages, 8 figures, Accepted for publication in Astrophysical Journal
null
10.1086/527286
null
astro-ph
null
Results from the most extensive study of the time-evolving dust structure around the prototype "Pinwheel" nebula WR 104 are presented. Encompassing 11 epochs in three near-infrared filter bandpasses, a homogeneous imaging data set spanning more than 6 years (or 10 orbits) is presented. Data were obtained from the highly successful Keck Aperture Masking Experiment, which can recover high fidelity images at extremely high angular resolutions, revealing the geometry of the plume with unprecedented precision. Inferred properties for the (unresolved) underlying binary and wind system are orbital period 241.5 +/- 0.5 days and angular outflow velocity of 0.28 +/- 0.02 mas/day. An optically thin cavity of angular size 13.3 +/- 1.4 mas was found to lie between the central binary and the onset of the spiral dust plume. Rotational motion of the wind system induced by the binary orbit is found to have important ramifications: entanglement of the winds results in strong shock activity far downstream from the nose of the bowshock. The far greater fraction of the winds participating in the collision may play a key role in gas compression and the nucleation of dust at large radii from the central binary and shock stagnation point. Investigation of the effects of radiative braking pointed towards significant modifications of the simple hydrostatic colliding wind geometry, extending the relevance of this phenomena to wider binary systems than previously considered. Limits placed on the maximum allowed orbital eccentricity of e < 0.06 argue strongly for a prehistory of tidal circularization in this system. Finally we discuss the implications of Earth's polar (i < 16 deg) vantage point onto a system likely to host supernova explosions at future epochs.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 09:09:37 GMT" } ]
2009-11-13T00:00:00
[ [ "Tuthill", "Peter", "" ], [ "Monnier", "John", "" ], [ "Lawrance", "Nicholas", "" ], [ "Danchi", "William", "" ], [ "Owocki", "Stan", "" ], [ "Gayley", "Kenneth", "" ] ]
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712.2112
Peter Elia\v{s}
Peter Elias
Dirichlet sets and Erdos-Kunen-Mauldin theorem
9 pages
null
null
null
math.GN
null
By a theorem proved by Erdos, Kunen and Mauldin, for any nonempty perfect set $P$ on the real line there exists a perfect set $M$ of Lebesgue measure zero such that $P+M=\mathbb{R}$. We prove a stronger version of this theorem in which the obtained perfect set $M$ is a Dirichlet set. Using this result we show that for a wide range of familes of subsets of the reals, all additive sets are perfectly meager in transitive sense. We also prove that every proper analytic subgroup $G$ of the reals is contained in an F-sigma set $F$ such that $F+G$ is a meager null set.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:18:29 GMT" } ]
2007-12-14T00:00:00
[ [ "Elias", "Peter", "" ] ]
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712.2113
Andreas U. Schmidt
Andreas U. Schmidt, Nicolai Kuntze and Michael Kasper
On the deployment of Mobile Trusted Modules
To appear in: Proceedings of the Wireless Communications and Networking Conference, IEEE WCNC 2008, Las Vegas, USA, 31 March - 2 April 2008
null
10.1109/WCNC.2008.553
null
cs.CR
null
In its recently published TCG Mobile Reference Architecture, the TCG Mobile Phone Work Group specifies a new concept to enable trust into future mobile devices. For this purpose, the TCG devises a trusted mobile platform as a set of trusted engines on behalf of different stakeholders supported by a physical trust-anchor. In this paper, we present our perception on this emerging specification. We propose an approach for the practical design and implementation of this concept and how to deploy it to a trustworthy operating platform. In particular we propose a method for the take-ownership of a device by the user and the migration (i.e., portability) of user credentials between devices.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 20:53:32 GMT" } ]
2016-11-18T00:00:00
[ [ "Schmidt", "Andreas U.", "" ], [ "Kuntze", "Nicolai", "" ], [ "Kasper", "Michael", "" ] ]
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712.2114
Savely G. Karshenboim
E. Yu. Korzinin, V. G. Ivanov, S. G. Karshenboim
The Uehling correction in muonic atoms exactly in Z\alpha
null
null
10.1103/PhysRevA.80.022510
null
physics.atom-ph
null
The Uehling correction to the energy levels is presented in terms of the hypergeometric functions 2F1. This presentation allows to derived various asymptotics and approximations. Further applications of this method to other atomic characteristics are also considered.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 18:06:11 GMT" } ]
2014-11-04T00:00:00
[ [ "Korzinin", "E. Yu.", "" ], [ "Ivanov", "V. G.", "" ], [ "Karshenboim", "S. G.", "" ] ]
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712.2115
Zhijin Wu
Zhijin Wu, Rafael A. Irizarry
A statistical framework for the analysis of microarray probe-level data
Published in at http://dx.doi.org/10.1214/07-AOAS116 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Statistics 2007, Vol. 1, No. 2, 333-357
10.1214/07-AOAS116
IMS-AOAS-AOAS116
stat.AP
null
In microarray technology, a number of critical steps are required to convert the raw measurements into the data relied upon by biologists and clinicians. These data manipulations, referred to as preprocessing, influence the quality of the ultimate measurements and studies that rely upon them. Standard operating procedure for microarray researchers is to use preprocessed data as the starting point for the statistical analyses that produce reported results. This has prevented many researchers from carefully considering their choice of preprocessing methodology. Furthermore, the fact that the preprocessing step affects the stochastic properties of the final statistical summaries is often ignored. In this paper we propose a statistical framework that permits the integration of preprocessing into the standard statistical analysis flow of microarray data. This general framework is relevant in many microarray platforms and motivates targeted analysis methods for specific applications. We demonstrate its usefulness by applying the idea in three different applications of the technology.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 09:57:57 GMT" } ]
2009-09-29T00:00:00
[ [ "Wu", "Zhijin", "" ], [ "Irizarry", "Rafael A.", "" ] ]
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712.2116
Francesco Massaro
F. Massaro, A. Tramacere, A. Cavaliere, M. Perri and P. Giommi
X-ray spectral evolution of TeV BL Lac objects: eleven years of observations with BeppoSAX, XMM-Newton and SWIFT satellites
14 pages, 9 figures, A&A accepted
null
10.1051/0004-6361:20078639
null
astro-ph
null
Many of the extragalactic sources detected in $\gamma$ rays at TeV energies are BL Lac objects. In particular, they belong to the subclass of ``high frequency peaked BL Lacs" (HBLs), as their spectral energy distributions exhibit a first peak in the X-ray band. At a closer look, their X-ray spectra appear to be generally curved into a log-parabolic shape. In a previous investigation of Mrk 421, two correlations were found between the spectral parameters. One involves the height $S_p$ increasing with the position $E_p$ of the first peak; this was interpreted as a signature of synchrotron emission from relativistic electrons. The other involves the curvature parameter $b$ decreasing as $E_p$ increases; this points toward statistical/stochastic acceleration processes for the emitting electrons. We analyse X-ray spectra of several TeV HBLs to pinpoint their behaviours in the $E_p-S_p$ and $E_p-b$ planes and to compare them with Mrk 421. We perfom X-ray spectral analyses of a sample of 15 BL Lacs. We report the whole set of observations obtained with the \sax, \xmm and \swf satellites between 29/06/96 and 07/04/07. We focus on five sources (PKS 0548-322, 1H 1426+418, Mrk 501, 1ES 1959+650, PKS2155-304) whose X-ray observations warrant detailed searching of correlations or trends. Within our database, we find that four out of five sources, namely PKS 0548-322, 1H 1426+418, Mrk 501 and 1ES 1959+650, follow similar trends as Mrk 421 in the $E_p-S_p$ plane, while PKS 2155-304 differs. As for the $E_p-b$ plane, all TeV HBLs follow a similar behaviour. The trends exhibited by Mrk 421 appear to be shared by several TeV HBLs, such as to warrant discussing predictions from the X-ray spectral evolution to that of TeV emissions.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:00:11 GMT" } ]
2009-11-13T00:00:00
[ [ "Massaro", "F.", "" ], [ "Tramacere", "A.", "" ], [ "Cavaliere", "A.", "" ], [ "Perri", "M.", "" ], [ "Giommi", "P.", "" ] ]
[ 0.0179006588, 0.043334458, 0.0223222841, -0.0676722974, 0.0063238074, 0.0585519075, -0.0148899211, 0.0186312981, 0.0722576901, -0.0082259886, -0.0407898203, -0.0256605502, -0.0806726366, -0.0206594504, 0.1351430416, 0.0330803171, -0.0435360149, 0.0295278989, -0.1060182527, -0.0056309602, -0.0895410851, -0.0370862335, -0.0138947405, 0.0312411208, -0.141492039, -0.0128806634, -0.0456271544, 0.0381444022, 0.0560828522, 0.0180644225, -0.012364178, -0.0607186295, 0.0303593148, -0.0849556923, -0.0958396941, 0.0889868066, 0.0247031599, -0.0062482241, -0.0116587328, -0.0202311445, 0.0447705425, -0.0092400657, -0.0723584667, 0.0034988795, -0.0655559674, -0.028016232, 0.0272352025, -0.0856611356, 0.019034408, 0.1072275862, -0.0477686822, 0.093874529, -0.0987118632, -0.0269832592, -0.0928163603, -0.000978647, -0.0478946529, 0.063086912, -0.0834440291, -0.0385475121, 0.0274619535, 0.0642458573, -0.0580480173, -0.0342140682, -0.0509935729, -0.0604666844, 0.0213522986, 0.0467105135, 0.0578968525, 0.0640442967, 0.0015140291, -0.0212767143, -0.0300317872, 0.079160966, 0.0247661471, -0.0386482887, 0.0443170406, 0.0108903022, -0.0872735828, -0.0718545765, 0.060164351, 0.0228009801, -0.0775989145, -0.0100525869, 0.0042200708, 0.0123263858, 0.0939249173, 0.057342574, 0.0429817364, 0.0263282023, -0.0522532947, -0.0074638566, -0.0312159266, -0.0009140862, 0.0185305197, -0.0723584667, -0.0110036768, -0.0858626962, 0.0674707443, -0.0313418992, 0.0295278989, 0.1091423705, 0.0416716225, -0.2004470676, 0.1019367576, -0.0251692571, -0.0644474104, -0.0273359809, 0.0185431167, -0.0824866369, -0.0051081753, 0.0208862014, -0.057997629, 0.0926651955, -0.0710483566, -0.0477686822, -0.1693067253, -0.0450476818, 0.0067773075, 0.107933037, -0.0657071322, 0.0811261386, 0.0136805875, -0.0628853515, 0.0538657382, -0.0064560785, 0.0889868066, -0.1102509275, -0.1049097031, -0.0582495742, 0.1676942706, -0.0843510255, 0.0267313141, -0.0124145662, -0.0191603806, -0.0521021262, -0.0247283559, -0.0583503507, 0.0075142453, 0.0220829379, -0.0370358452, 0.0703429133, -0.0092841554, 0.0578464642, 0.0037886158, 0.0570906289, -0.0018328964, -0.0323496759, 0.0185683109, -0.0371114276, -0.0481969863, 0.0417472087, 0.0546215735, -0.0037350776, -0.0112304268, -0.1591281593, -0.00236198, 0.0847541392, -0.0649513006, -0.0060844603, 0.037413761, 0.0758856907, -0.0650016889, 0.070292525, 0.0362548158, 0.0093408432, 0.0085094264, -0.0027147022, -0.1474379301, -0.1201271489, -0.0551254638, -0.0341888703, 0.0053475224, -0.0734670237, 0.0282177869, 0.0530091263, 0.071955353, -0.1736401618, -0.0798664168, -0.0204830896, -0.0382703729, 0.0186690893, 0.0622302964, 0.0187572706, -0.0035933587, -0.0655559674, -0.1060182527, 0.0912543088, -0.005854561, -0.0625326335, 0.011148545, 0.1441122741, 0.0980064198, 0.0818315819, -0.0838975236, -0.0943280309, -0.0262022298, 0.0196012836, -0.0561332405, 0.0390765965, 0.1110571474, 0.0705444664, 0.0442918465, -0.0856611356, -0.0417472087, 0.0030359316, 0.0985103101, 0.0635404065, -0.0484489314, -0.0489780158, 0.1144835949, -0.0376153179, -0.0054829428, 0.038295567, -0.1104524806, 0.023430841, -0.0634900182, 0.0742228553, 0.0771958008, 0.0539161265, -0.0765407458, 0.0535634048, 0.0359776765, 0.079916805, 0.0312915109, 0.033936929, 0.0941264778, -0.0364563726, 0.0323496759, 0.0074575581, 0.0385727063, 0.0626837984, -0.023191493, -0.0442918465, 0.0078102802, -0.0154567966, 0.0223726742, 0.0079866415, 0.0376657061, -0.118010819, -0.0328535661, 0.0406638458, 0.027789481, 0.0732654706, -0.042452652, -0.0330803171, -0.079160966, -0.0901961401, 0.0073630787, 0.0307120383, 0.0515730456, -0.0015770153, -0.1325228214, -0.0620287433, -0.0216420349, -0.0000381607 ]
712.2117
Sergio Messina
S. Messina (INAF-Catania Astrophysical Observatory)
Long-term magnetic activity in close binary systems. I. Patterns of color variations
Accepted by A&A
null
10.1051/0004-6361:20078932
null
astro-ph
null
We present the results of a long-term photometric monitoring project carried out at Catania Astrophysical Observatory and aimed at studying magnetic activity in close binary systems. We present the complete observations dataset (38,000 photoelectric observations in UBV) and new results of an investigation on the origin of brightness and color variations observed in the close binary stars: AR Psc, VY Ari, UX Ari, V711 Tau, EI Eri, V1149 Ori, DH Leo, HU Vir, RS CVn, V775 Her, AR Lac, SZ Psc, II Peg and BY Dra. Correlation and regression analyses are carried out. We find the existence of two different patterns of color variations. Eight stars in our sample: BY Dra, VY Ari, V775 Her, II Peg, V1149 Ori, HU Vir, EI Eri and DH Leo become redder when they get fainter. The other six stars show the opposite behaviour, i.e. they become bluer when they get fainter. For V711 Tau this behaviour could be explained by the increased relative U- and B- flux contribution by the earlier-type component of the binary system when the cooler component gets fainter. On the other hand, for AR Psc, UX Ari, RS CVn, SZ Psc and AR Lac the existence of hot photospheric faculae must be necessarily invoked. We also found that in single-lined and double-lined binary stars in which the fainter component is inactive or much less active the V magnitude is correlated to B-V and U-B color variations in more than 60% of observation seasons. The correlation is found in less than 40% of observation seasons when the fainter component has a non-negligible level of activity and/or hot faculae are present but they are either spatially or temporally uncorrelated to spots.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:44:19 GMT" } ]
2009-11-13T00:00:00
[ [ "Messina", "S.", "", "INAF-Catania Astrophysical Observatory" ] ]
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712.2118
Mohammad Sami
Mofazzal Azam, M. Sami, C. S. Unnikrishnan, T. Shiromizu
Proposal for an experiment to search for Randall-Sundrum type corrections to Newton's law of gravitation
4 pages and 5 figures, figures improved, minor clarifications and few references added, final version to appear in PRD (rapid communications)
Phys.Rev.D77:101101,2008
10.1103/PhysRevD.77.101101
null
hep-th astro-ph gr-qc hep-ph
null
String theory, as well as the string inspired brane-world models such as the Randall-Sundrum (RS) one, suggest a modification of Newton's law of gravitation at small distance scales. Search for modifications of standard gravity is an active field of research in this context. It is well known that short range corrections to gravity would violate the Newton-Birkhoff theorem. Based on calculations of RS type non-Newtonian forces for finite size spherical bodies, we propose a torsion balance based experiment to search for the effects of violation of this celebrated theorem valid in Newtonian gravity as well as the general theory of relativity. We explain the main principle behind the experiment and provide detailed calculations suggesting optimum values of the parameters of the experiment. The projected sensitivity is sufficient to probe the Randall-Sundrum parameter up to 10 microns.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:13:19 GMT" }, { "version": "v2", "created": "Wed, 2 Apr 2008 07:18:41 GMT" } ]
2009-09-29T00:00:00
[ [ "Azam", "Mofazzal", "" ], [ "Sami", "M.", "" ], [ "Unnikrishnan", "C. S.", "" ], [ "Shiromizu", "T.", "" ] ]
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712.2119
Leonid Kitchatinov
L. L. Kitchatinov, G. R\"udiger
Stability of toroidal magnetic fields in the solar tachocline and beneath
5 pages, 9 figures
Astron.Nachr.328:1150-1154,2007
10.1002/asna.200710859
null
astro-ph
null
Stability of toroidal magnetic field in a stellar radiation zone is considered for the cases of uniform and differential rotation. In the rigidly rotating radiative core shortly below the tachocline, the critical magnetic field for instability is about 600 G. The unstable disturbances for slightly supercritical fields have short radial scales ~1 Mm. Radial mixing produced by the instability is estimated to conclude that the internal field of the sun can exceed the critical value of 600 G only marginally. Otherwise, the mixing is too strong and not compatible with the observed lithium abundance. Analysis of joint instability of differential rotation and toroidal field leads to the conclusion that axisymmetric models of the laminar solar tachocline are stable to nonaxisymmetric disturbances. The question of whether sun-like stars can posses tachoclines is addressed with positive answer for stars with rotation periods shorter than about two months.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:21:39 GMT" } ]
2009-11-13T00:00:00
[ [ "Kitchatinov", "L. L.", "" ], [ "Rüdiger", "G.", "" ] ]
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712.212
Liliana Formiggini
Elia M. Leibowitz and Liliana Formiggini (The Wise Observatory-Tel Aviv University-Israel)
Activity cycle of the giant star of Z Andromedae and its spin period
9 pages, 4 figures, Accepted for publication in MNRAS
null
10.1111/j.1365-2966.2008.12847.x
null
astro-ph
null
We have reanalyzed the long-term optical light curve (LC) of the symbiotic star Z Andromedae, covering 112--yr of mostly visual observations. Two strictly periodic and one quasi-periodic cycles can be identified in this LC. A P1=7550 d quasi periodicity characterizes the repetition time of the outburst episodes of this symbiotic star. Six such events have been recorded so far. During quiescence states of the system, i.e. in time intervals between outbursts, the LC is clearly modulated by a stable coherent period of P2=759.1 d. This is the well known orbital period of the Z And binary system that have been measured also spectroscopically. A third coherent period of P3=658.4 d is modulating the intense fluctuations in the optical brightness of the system during outbursts. We attribute the trigger of the outbursts phenomenon and the clock that drives it, to a solar type magnetic dynamo cycle that operates in the convection and the outer layers of the giant star of the system. We suggest that the intense surface activity of the giant star during maximum phases of its magnetic cycle is especially enhanced in one or two antipode regions, fixed in the atmosphere of the star and rotating with it. Such spots could be active regions around the North and the South poles of a general magnetic dipole field of the star. The P3 periodicity is half the beat of the binary orbital period of the system and the spin period of the giant. The latter is then either 482 or 1790 d. If only one pole is active on the surface of the giant, P3 is the beat period itself, and the spin period is 352 d. It could also be 5000 d if the giant is rotating in retrograde direction. We briefly compare these findings in the LC of Z And to similar modulations that were identified in the LC of two other prototype symbiotics, BF Cyg and YY Her.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:21:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Leibowitz", "Elia M.", "", "The Wise Observatory-Tel\n Aviv University-Israel" ], [ "Formiggini", "Liliana", "", "The Wise Observatory-Tel\n Aviv University-Israel" ] ]
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712.2121
Konstantinos Lagoudakis G.
A. Baas, K. G. Lagoudakis, M. Richard, R. Andre, Le Si Dang, B. Deveaud-Pledran
Synchronized and Desynchronized Phases of Exciton-Polariton Condensates in the Presence of Disorder
11 pages, 4 figures,corrected typos, added figures
Phys. Rev. Lett. 100, 170401 (2008)
10.1103/PhysRevLett.100.170401
null
cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Condensation of exciton-polaritons in semiconductor microcavities takes place despite in plane disorder. Below the critical density the inhomogeneity of the potential seen by the polaritons strongly limits the spatial extension of the ground state. Above the critical density, in presence of weak disorder, this limitation is spontaneously overcome by the non linear interaction, resulting in an extended synchronized phase. This mechanism is clearly evidenced by spatial and spectral studies, coupled to interferometric measurements. In case of strong disorder, several non phase-locked (independent) condensates can be evidenced. The transition from synchronized phase to desynchronized phase is addressed considering multiple realizations of the disorder.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:25:39 GMT" }, { "version": "v2", "created": "Fri, 21 Dec 2007 15:04:22 GMT" }, { "version": "v3", "created": "Wed, 18 Jun 2008 11:42:07 GMT" } ]
2009-11-13T00:00:00
[ [ "Baas", "A.", "" ], [ "Lagoudakis", "K. G.", "" ], [ "Richard", "M.", "" ], [ "Andre", "R.", "" ], [ "Dang", "Le Si", "" ], [ "Deveaud-Pledran", "B.", "" ] ]
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712.2122
Noriyuki Abe
Noriyuki Abe
On the existence of homomorphisms between principal series of complex semisimple Lie groups
8 pages
null
null
null
math.RT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We determine when there exists a nonzero homomorphism between principal series representations of a complex semisimple Lie group. We also determines the existence of homomorphisms between twisted Verma modules.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:33:39 GMT" }, { "version": "v2", "created": "Wed, 29 Oct 2008 03:51:28 GMT" } ]
2008-10-29T00:00:00
[ [ "Abe", "Noriyuki", "" ] ]
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712.2123
Andrea Malchiodi
Andrea Malchiodi
Conformal Metrics with Constant Q-Curvature
This is a contribution to the Proceedings of the 2007 Midwest Geometry Conference in honor of Thomas P. Branson, published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
SIGMA 3 (2007), 120, 11 pages
10.3842/SIGMA.2007.120
null
math.DG math.AP
null
We consider the problem of varying conformally the metric of a four dimensional manifold in order to obtain constant $Q$-curvature. The problem is variational, and solutions are in general found as critical points of saddle type. We show how the problem leads naturally to consider the set of formal barycenters of the manifold.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:33:03 GMT" } ]
2008-04-25T00:00:00
[ [ "Malchiodi", "Andrea", "" ] ]
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712.2124
Elena A. Erosheva
Elena A. Erosheva, Stephen E. Fienberg, Cyrille Joutard
Describing disability through individual-level mixture models for multivariate binary data
Published in at http://dx.doi.org/10.1214/07-AOAS126 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Statistics 2007, Vol. 1, No. 2, 502-537
10.1214/07-AOAS126
IMS-AOAS-AOAS126
stat.AP
null
Data on functional disability are of widespread policy interest in the United States, especially with respect to planning for Medicare and Social Security for a growing population of elderly adults. We consider an extract of functional disability data from the National Long Term Care Survey (NLTCS) and attempt to develop disability profiles using variations of the Grade of Membership (GoM) model. We first describe GoM as an individual-level mixture model that allows individuals to have partial membership in several mixture components simultaneously. We then prove the equivalence between individual-level and population-level mixture models, and use this property to develop a Markov Chain Monte Carlo algorithm for Bayesian estimation of the model. We use our approach to analyze functional disability data from the NLTCS.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:38:24 GMT" } ]
2009-09-29T00:00:00
[ [ "Erosheva", "Elena A.", "" ], [ "Fienberg", "Stephen E.", "" ], [ "Joutard", "Cyrille", "" ] ]
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712.2125
Tom H. Koornwinder
Tom H. Koornwinder and Michael J. Schlosser
On an identity by Chaundy and Bullard. I
20 pages; added in v3: more references to earlier occurrences of the identity and its multivariable analogue, combinatorial proof of the identity and extension to noninteger m,n, proof of multivariable identity by splitting up Dirichlet's multivariable beta integral
Indag. Math. (N.S.) 19 (2008), 239-261
null
null
math.CA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An identity by Chaundy and Bullard writes 1/(1-x)^n (n=1,2,...) as a sum of two truncated binomial series. This identity was rediscovered many times. Notably, a special case was rediscovered by I. Daubechies, while she was setting up the theory of wavelets of compact support. We discuss or survey many different proofs of the identity, and also its relationship with Gauss hypergeometric series. We also consider the extension to complex values of the two parameters which occur as summation bounds. The paper concludes with a discussion of a multivariable analogue of the identity, which was first given by Damjanovic, Klamkin and Ruehr. We give the relationship with Lauricella hypergeometric functions and corresponding PDE's. The paper ends with a new proof of the multivariable case by splitting up Dirichlet's multivariable beta integral.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:42:45 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 22:42:26 GMT" }, { "version": "v3", "created": "Sat, 28 Jun 2008 11:16:28 GMT" } ]
2009-02-20T00:00:00
[ [ "Koornwinder", "Tom H.", "" ], [ "Schlosser", "Michael J.", "" ] ]
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712.2126
Miriam Giorgini
Giorgio Giacomelli (Dept of Physics, Univ. of Bologna, and INFN)
Atmospheric neutrino and Long Baseline neutrino experiments
Invited Lecture at the Carpatian Summer School of Physics 2007, Sinaia, Romania, August 2007
AIPConf.Proc.972:412-420,2008
10.1063/1.2870369
null
hep-ex
null
The results obtained by several experiments on atmospheric neutrino oscillations are summarized and discussed. Then the results obtained by different long baseline neutrino experiments are considered. Finally conclusions and perspectives are made.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:53:52 GMT" } ]
2008-11-26T00:00:00
[ [ "Giacomelli", "Giorgio", "", "Dept of Physics, Univ. of Bologna, and INFN" ] ]
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712.2127
Chao Li
Chao Li, Ute Ebert, W.J.M. Brok, Willem Hundsdorfer
Spatial coupling of particle and fluid models for streamers: where nonlocality matters
4 pages, 5 figures
2008 J. Phys. D: Appl. Phys. 41 032005
10.1088/0022-3727/41/3/032005
null
physics.plasm-ph physics.comp-ph
null
Particle models for streamer ionization fronts contain correct electron energy distributions, runaway effects and single electron statistics. Conventional fluid models are computationally much more efficient for large particle numbers, but create too low ionization densities in high fields. To combine their respective advantages, we here show how to couple both models in space. We confirm that the discrepancies between particle and fluid fronts arise from the steep electron density gradients in the leading edge of the fronts. We find the optimal position for the interface between models that minimizes computational effort and reproduces the results of a pure particle model.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 10:57:53 GMT" } ]
2008-01-09T00:00:00
[ [ "Li", "Chao", "" ], [ "Ebert", "Ute", "" ], [ "Brok", "W. J. M.", "" ], [ "Hundsdorfer", "Willem", "" ] ]
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712.2128
Oleksandr Fialko
O. Fialko and K. Ziegler
Functional-integral representation of atomic mixtures
6 pages, 5 figures, contribution to 'Path Integrals, Dresden 2007'
null
10.1142/9789812837271_0054
null
cond-mat.other
null
A mixture of spin-1/2 fermionic atoms and molecules of paired fermionic atoms is studied in an optical lattice. The molecules are formed by an attractive nearest-neighbor interaction. A functional integral is constructed for this many-body system and analyzed in terms of a mean-field approximation and Gaussian fluctuations. This provides a phase diagram with the two merging Mott insulators and an intermediate superfluid. The Gaussian fluctuations give rise to an induced repulsive dimer-dimer interaction mediated by the unpaired fermions. The effect of an unbalanced distribution of spin-up and spin-down fermions is also discussed.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:01:58 GMT" } ]
2017-08-23T00:00:00
[ [ "Fialko", "O.", "" ], [ "Ziegler", "K.", "" ] ]
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712.2129
Alexis Darrasse
Olivier Bodini, Alexis Darrasse and Mich\`ele Soria
Distances in random Apollonian network structures
12 pages
null
null
null
math.CO
null
In this paper, we study the distribution of distances in random Apollonian network structures (RANS), a family of graphs which has a one-to-one correspondence with planar ternary trees. Using multivariate generating functions that express all information on distances, and singularity analysis for evaluating the coefficients of these functions, we describe the distribution of distances to an outermost vertex, and show that the average value of the distance between any pair of vertices in a RANS of order n is asymptotically square root of n.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:13:24 GMT" } ]
2007-12-14T00:00:00
[ [ "Bodini", "Olivier", "" ], [ "Darrasse", "Alexis", "" ], [ "Soria", "Michèle", "" ] ]
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712.213
Andrei Yakovlev
Lev Klebanov, Andrei Yakovlev
Diverse correlation structures in gene expression data and their utility in improving statistical inference
Published in at http://dx.doi.org/10.1214/07-AOAS120 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Statistics 2007, Vol. 1, No. 2, 538-559
10.1214/07-AOAS120
IMS-AOAS-AOAS120
stat.AP
null
It is well known that correlations in microarray data represent a serious nuisance deteriorating the performance of gene selection procedures. This paper is intended to demonstrate that the correlation structure of microarray data provides a rich source of useful information. We discuss distinct correlation substructures revealed in microarray gene expression data by an appropriate ordering of genes. These substructures include stochastic proportionality of expression signals in a large percentage of all gene pairs, negative correlations hidden in ordered gene triples, and a long sequence of weakly dependent random variables associated with ordered pairs of genes. The reported striking regularities are of general biological interest and they also have far-reaching implications for theory and practice of statistical methods of microarray data analysis. We illustrate the latter point with a method for testing differential expression of nonoverlapping gene pairs. While designed for testing a different null hypothesis, this method provides an order of magnitude more accurate control of type 1 error rate compared to conventional methods of individual gene expression profiling. In addition, this method is robust to the technical noise. Quantitative inference of the correlation structure has the potential to extend the analysis of microarray data far beyond currently practiced methods.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:15:49 GMT" } ]
2007-12-18T00:00:00
[ [ "Klebanov", "Lev", "" ], [ "Yakovlev", "Andrei", "" ] ]
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712.2131
Nilotpal Ghosh
N. Ghosh, H. Schmidt and M. Grundmann
Andreev reflections at large ferromagnet/high-T_C superconductor area junctions with rough interface
12 pages including 5 figures, title, text and figures have been revised
null
null
null
cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sub-gap conductance at a large area junction with a rough interface of a ferromagnet and a high-T$_{C}$ superconductor is superimposed by multiple peaks which is not expected from an ideal point contact Andreev reflection process. We demonstrate this phenomenon by measuring resistance as a function of bias voltage of a Co/Y$_{1}$Ba$_{2}$Cu$_{3}$O$_{7-\delta}$ junction with contact area 50 x 70 $\mu$ $m^{2}$ at various temperatures. In order to analyze such Andreev reflection data, the interface is assumed to have random potentials which can create local electric fields. The Blonder-Tinkham-Klapwijk theory is modified with the inclusion of a broadening parameter due to finite life time effects of quasi particles. An additional voltage drop due to local electric fields at the rough interface has been included in terms of an extra energy shift which may be related to the asymmetry of normalized resistance data. Spin polarization has been introduced for the ferromagnet. The presented model explains the multi-peak nature and asymmetry of Andreev reflection data experimentally observed at large area junctions. Extension of the model also interprets the experimentally observed anomalous enhancement of resistance peaks in the sub-gap region which may result from crossing the critical current limit across the junction.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:18:00 GMT" }, { "version": "v2", "created": "Wed, 25 Mar 2009 06:05:02 GMT" } ]
2009-03-25T00:00:00
[ [ "Ghosh", "N.", "" ], [ "Schmidt", "H.", "" ], [ "Grundmann", "M.", "" ] ]
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712.2132
Jos\'e Carmelo Gonz\'alez-D\'avila
J.C. Gonzalez-Davila
Jacobi osculating rank and isotropic geodesics on naturally reductive 3-manifolds
19 pages, 2 figures
null
null
null
math.DG math.MG
null
We study the Jacobi osculating rank of geodesics on naturally reductive homogeneous manifolds and we apply this theory to the 3-dimensional case. Here, each non-symmetric, simply connected naturally reductive 3-manifold can be given as a principal bundle over a surface of constant curvature, such that the curvature of its horizontal distribution is also a constant. Then, we prove that the Jacobi osculating rank of every geodesic is two except for the Hopf fibers, where it is zero. Moreover, we determine all isotropic geodesics and the isotropic tangent conjugate locus.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:22:28 GMT" } ]
2007-12-14T00:00:00
[ [ "Gonzalez-Davila", "J. C.", "" ] ]
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712.2133
Marius Buliga
Dan Polisevski
The Div-Curl Lemma Revisited
null
null
null
null
math.FA math.AP
null
The Div-Curl Lemma, which is the basic result of the compensated compactness theory in Sobolev spaces, was introduced by F. Murat (1978) with distinct proofs for the $L^2(\Omega)$ and $L^p(\Omega)$, $p \neq 2$, cases. In this note we present a slightly different proof, relying only on a Green-Gauss integral formula and on the usual Rellich-Kondrachov compactness properties.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:23:15 GMT" } ]
2007-12-14T00:00:00
[ [ "Polisevski", "Dan", "" ] ]
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712.2134
Adam Hill
A.B. Hill, A.J. Dean, R. Landi, V.A. McBride, A. De Rosa, A.J. Bird, A. Bazzano, V. Sguera
Probing the nature of IGR J16493-4348: Spectral and temporal analysis of the 1-100 keV emission
Accepted for publication in MNRAS. 7 pages, 5 figures (Note the resolution of figure 5 has been reduced)
null
10.1111/j.1365-2966.2008.12849.x
null
astro-ph
null
IGR J16493-4348 was one of the first new sources to be detected by the INTEGRAL gamma-ray telescope in the 18-100 keV energy band. Based upon spatial coincidence the source was originally associated with the free radio pulsar PSR J1649-4349. Presented here are the results of 2.8 Ms of observations made by the INTEGRAL mission and a 5.6 ks observation with the Swift X-ray Telescope. Spectral analysis indicates that the source is best modeled by an absorbed power law with a high energy cut-off at E$_{cut}$~15 keV and a hydrogen absorbing column of NH=5.4$^{+1.3}_{-1}$ x 10$^{22}$ cm$^{-2}$. Analysis of the light curves indicates that the source is a weak, persistent gamma-ray emitter showing indications of variability in the 2-9 and 22-100 keV bands. The average source flux is ~1.1 x 10^{-10} erg cm$^{-2}$ s$^{-1}$ in the 1-100 keV energy band. No coherent timing signal is identified at any timescale in the INTEGRAL or Swift data. The refined source location and positional uncertainty of IGR J16493-4348 places PSR J1649-4349 outside of the 90% error circle. We conclude that IGR J16493-4348 is not associated with PSR J1649-4349. Combining the INTEGRAL observations with Swift/XRT data and information gathered by RXTE and Chandra we suggest that IGR J16493-4348 is an X-ray binary; and that the source characteristics favour a high mass X-ray binary although an LMXB nature cannot be ruled out.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:18:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Hill", "A. B.", "" ], [ "Dean", "A. J.", "" ], [ "Landi", "R.", "" ], [ "McBride", "V. A.", "" ], [ "De Rosa", "A.", "" ], [ "Bird", "A. J.", "" ], [ "Bazzano", "A.", "" ], [ "Sguera", "V.", "" ] ]
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712.2135
Fan Yizhong
Yi-Zhong Fan, Tsvi Piran and Da-Ming Wei
Central engine afterglow of Gamma-ray Bursts
4 pages including 1 figure. Presented at the conference "Astrophysics of Compact Objects" (July 1-7, 2007; Huangshan, China)
AIP Conf.Proc.968:32-35,2008
10.1063/1.2840422
null
astro-ph
null
Before 2004, nearly all GRB afterglow data could be understood in the context of the external shocks model. This situation has changed in the past two years, when it became clear that some afterglow components should be attributed to the activity of the central engine; i.e., the {\it central engine afterglow}. We review here the afterglow emission that is directly related to the GRB central engine. Such an interpretation proposed by Katz, Piran & Sari, peculiar in pre-{\it Swift} era, has become generally accepted now.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 11:29:53 GMT" } ]
2009-06-23T00:00:00
[ [ "Fan", "Yi-Zhong", "" ], [ "Piran", "Tsvi", "" ], [ "Wei", "Da-Ming", "" ] ]
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712.2136
Matyas Koniorczyk
Matyas Koniorczyk, Arpad Varga, Peter Rapcan and Vladimir Buzek
Quantum homogenization and state randomization in semi-quantal spin systems
10 pages, 10 figures (included)
null
10.1103/PhysRevA.77.052106
null
quant-ph
null
We investigate dynamics of semi-quantal spin systems in which quantum bits are attached to classically and possibly stochastically moving classical particles. The interaction between the quantum bits takes place when the respective classical particles get close to each other in space. We find that with Heisenberg XX couplings quantum homogenization takes place after a time long enough, regardless of the details of the underlying classical dynamics. This is accompanied by the development of a stationary bipartite entanglement. If the information on the details of the motion of a stochastic classical system is disregarded, the stationary state of the whole quantum subsystem is found to be a complete mixture in the studied cases, though the transients depend on the properties of the classical motion.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 18:13:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Koniorczyk", "Matyas", "" ], [ "Varga", "Arpad", "" ], [ "Rapcan", "Peter", "" ], [ "Buzek", "Vladimir", "" ] ]
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712.2137
Jordy Bouwman
Jordy Bouwman, Wiebke Ludwig, Zainab Awad, Karin I. Oberg, Guido W. Fuchs, Ewine F. van Dishoeck and Harold Linnartz
Band profiles and band strengths in mixed H2O:CO ices
9 pages, 10 figures
Astron.Astrophys.476:995-1003,2007
10.1051/0004-6361:20078157
null
astro-ph
null
A laboratory study on the band profiles and band strengths of H2O in CO ice, and vice versa, is presented and interpreted in terms of two models. The results show that a mutual interaction takes place between the two species in the solid, which alters the band positions and band strengths. It is found that the band strengths of the H2O bulk stretch, bending and libration vibrational bands decrease linearly by a factor of up to 2 when the CO concentration is increased from 0 to 80%. By contrast, the band strength of the free OH stretch increases linearly. The results are compared to a recently performed quantitative study on H2O:CO2 ice mixtures. It is shown that for mixing ratios of 1:0.5 H2O:X and higher, the H2O bending mode offers a good tracer to distinguish between CO2 or CO in H2O ice. Additionally, it is found that the band strength of the CO fundamental remains constant when the water concentration is increased in the ice. The integrated absorbance of the 2152 cm-1 CO feature, with respect to the total integrated CO absorption feature, is found to be a good indicator of the degree of mixing of CO in the H2O:CO laboratory ice system. From the change in the H2O absorption band strength in laboratory ices upon mixing we conclude that astronomical water ice column densities on various lines of sight can be underestimated by up to 25% if significant amounts of CO and CO2 are mixed in.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:54:30 GMT" } ]
2009-06-25T00:00:00
[ [ "Bouwman", "Jordy", "" ], [ "Ludwig", "Wiebke", "" ], [ "Awad", "Zainab", "" ], [ "Oberg", "Karin I.", "" ], [ "Fuchs", "Guido W.", "" ], [ "van Dishoeck", "Ewine F.", "" ], [ "Linnartz", "Harold", "" ] ]
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712.2138
Andres Cano
A. Cano and E.I. Kats
Electromagnon excitations in modulated multiferroics
5 pages
Phys. Rev. B 78, 012104 (2008)
10.1103/PhysRevB.78.012104
null
cond-mat.mtrl-sci cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The phenomenological theory of ferroelectricity in spiral magnets presented in [M. Mostovoy, Phys. Rev. Lett. 96, 067601 (2006)] is generalized to describe consistently states with both uniform and modulated-in-space ferroelectric polarizations. A key point in this description is the symmetric part of the magnetoelectric coupling since, although being irrelevant for the uniform component, it plays an essential role for the non-uniform part of the polarization. We illustrate this importance in generic examples of modulated magnetic systems: longitudinal and transverse spin-density wave states and planar cycloidal phase. We show that even in the cases with no uniform ferroelectricity induced, polarization correlation functions follow to the soft magnetic behavior of the system due to the magnetoelectric effect. Our results can be easily generalized for more complicated types of magnetic ordering, and the applications may concern various natural and artificial systems in condensed matter physics (e.g., magnon properties could be extracted from dynamic dielectric response measurements).
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:47:21 GMT" }, { "version": "v2", "created": "Thu, 10 Jul 2008 11:50:57 GMT" } ]
2009-11-13T00:00:00
[ [ "Cano", "A.", "" ], [ "Kats", "E. I.", "" ] ]
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712.2139
Fabrice Patisson
F. Patisson (LSG2M), C. Ablitzer-Thouroude (DEC), S. Hebrard (LSG2M), D. Ablitzer (LSG2M)
Pr\'ediction de l'\'evolution granulom\'etrique et morphologique d'une poudre dans un four tournant
null
Dans Mat\'eriaux 2006 - Mat\'eriaux 2006, Dijon : France (2006)
null
null
cond-mat.mtrl-sci
null
The dry conversion process for making UO2 nuclear fuel pellets consists of two steps: hydrolysis of UF6 to UO2F2, followed by reducing pyrohydrolysis to UO2 in a rotary kiln. The physical characteristics (morphology, particle size distribution) of the powder obtained at the kiln end determine the final properties (sinterability, flow-ability, green strength). We developed a mathematical model describing the morphological evolution of the powder in the rotary kiln, which enables us to predict morphological characteristics of UO2 powder as functions of the processing conditions. Firstly, the powder flow in the kiln was modelled, including the exchanges between a dense phase (powder bed) and an airborne phase (particles showering down). An original feature of this model is to consider the effect of lifters for calculating the dynamic variables. Secondly, the phenomena responsible for the changes in morphology and grain size were identified and modelled. A population of fractal agglomerates was considered, whose number and size change due to Brownian and sedimentation agglomeration, sintering, breaking up, and chemical reactions. The model is based on population balances and the particle size distribution is divided into sections. Results of both dynamic and morphological calculations are compared to available measurements. Lastly, the influence of the different mechanisms of morphological evolution on the final size distribution is analysed.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:43:56 GMT" } ]
2007-12-14T00:00:00
[ [ "Patisson", "F.", "", "LSG2M" ], [ "Ablitzer-Thouroude", "C.", "", "DEC" ], [ "Hebrard", "S.", "", "LSG2M" ], [ "Ablitzer", "D.", "", "LSG2M" ] ]
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712.214
Karl-Henning Rehren
Roberto Longo, Karl-Henning Rehren
How to remove the boundary in CFT - an operator algebraic procedure
18 pages, 2 figures. v2: more precise title, reference corrected
Commun.Math.Phys.285:1165-1182,2009
10.1007/s00220-008-0459-8
null
math-ph hep-th math.MP math.OA
null
The relation between two-dimensional conformal quantum field theories with and without a timelike boundary is explored.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:44:57 GMT" }, { "version": "v2", "created": "Tue, 15 Jan 2008 15:39:11 GMT" } ]
2009-12-10T00:00:00
[ [ "Longo", "Roberto", "" ], [ "Rehren", "Karl-Henning", "" ] ]
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712.2141
Sebastien Destercke
Eric Chojnacki (IRSN), Jean Baccou (IRSN), S\'ebastien Destercke (IRSN, IRIT)
Numerical Sensitivity and Efficiency in the Treatment of Epistemic and Aleatory Uncertainty
null
Fifth International Conference on Sensitivity Analysis of Model Output, Budapest : Hongrie (2007)
null
null
cs.AI math.PR
null
The treatment of both aleatory and epistemic uncertainty by recent methods often requires an high computational effort. In this abstract, we propose a numerical sampling method allowing to lighten the computational burden of treating the information by means of so-called fuzzy random variables.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:49:30 GMT" } ]
2007-12-14T00:00:00
[ [ "Chojnacki", "Eric", "", "IRSN" ], [ "Baccou", "Jean", "", "IRSN" ], [ "Destercke", "Sébastien", "", "IRSN, IRIT" ] ]
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712.2142
Rong-Gen Cai
Rong-Gen Cai
Thermodynamics of Apparent Horizon in Brane World Scenarios
Latex, 10 pages, invited talk given at 8th Asia - Pacific International Conference on Gravitation and Astrophysics (ICGA8), to appear in Prog. Theor. Phys. Supplement
Prog.Theor.Phys.Suppl.172:100-109,2008
10.1143/PTPS.172.100
CAS-KITPC/ITP-027
hep-th gr-qc
null
Applying the Clausius relation, $\delta Q=TdS$, to the apparent horizon of FRW universe in brane world scenarios, we show that an explicit entropy expression associated with the apparent horizon can be obtained. On the apparent horizon, the relation, $dE=TdS +WdV$, also holds in the brane world scenarios. We show these results in the RSII model, warped DGP model and the more general case with a Gauss-Bonnet term in the bulk and an intrinsic curvature term on the brane.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:50:33 GMT" } ]
2008-11-26T00:00:00
[ [ "Cai", "Rong-Gen", "" ] ]
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712.2143
Volkmar Welker
Jakob Jonsson and Volkmar Welker
Complexes of Injective Words and Their Commutation Classes
null
null
null
null
math.CO math.KT
null
Let $S$ be a finite alphabet. An injective word over $S$ is a word over $S$ such that each letter in $S$ appears at most once in the word. We study Boolean cell complexes of injective words over $S$ and their commutation classes. This generalizes work by Farmer and by Bj\"orner and Wachs on the complex of all injective words.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:52:19 GMT" } ]
2007-12-14T00:00:00
[ [ "Jonsson", "Jakob", "" ], [ "Welker", "Volkmar", "" ] ]
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712.2144
Martin Zofka
M. Zofka, J. Bicak
Cylindrical spacetimes with a cosmological constant and their sources
15 pages, 2 figures
Class.Quant.Grav.25:015011,2008
10.1088/0264-9381/25/1/015011
null
gr-qc
null
We review and investigate some basic properties of static, cylindrically symmetric spacetimes with non-zero cosmological constant, find non-singular sheet sources of these spacetimes and discuss their characteristics, and clarify their relation to the 4D black-string solutions.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:54:51 GMT" } ]
2008-11-26T00:00:00
[ [ "Zofka", "M.", "" ], [ "Bicak", "J.", "" ] ]
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712.2145
Aurelien Perrin
Aur\'elien Perrin (LCFIO), Craig M. Savage, D. Boiron (LCFIO), V. Krachmalnicoff (LCFIO), C. I. Westbrook (LCFIO), Karen Kheruntsyan
Atomic four-wave mixing via condensate collisions
null
New Journal of Physics 10 (2008) 045021
10.1088/1367-2630/10/4/045021
null
quant-ph
null
We perform a theoretical analysis of atomic four-wave mixing via a collision of two Bose-Einstein condensates of metastable helium atoms, and compare the results to a recent experiment. We calculate atom-atom pair correlations within the scattering halo produced spontaneously during the collision. We also examine the expected relative number squeezing of atoms on the sphere. The analysis includes first-principles quantum simulations using the positive P-representation method. We develop a unified description of the experimental and simulation results.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:55:59 GMT" } ]
2008-05-05T00:00:00
[ [ "Perrin", "Aurélien", "", "LCFIO" ], [ "Savage", "Craig M.", "", "LCFIO" ], [ "Boiron", "D.", "", "LCFIO" ], [ "Krachmalnicoff", "V.", "", "LCFIO" ], [ "Westbrook", "C. I.", "", "LCFIO" ], [ "Kheruntsyan", "Karen", "" ] ]
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712.2146
Eivind Eriksen
Eivind Eriksen
An example of noncommutative deformations
5 pages, LaTeX, based on a talk I gave at the AGMF Baltic-Nordic Workshop in Gothenburg, 11-13 October, 2007
null
null
null
math.AG math.RT
null
We compute the noncommutative deformations of a family of modules over the first Weyl algebra. This example shows some important properties of noncommutative deformation theory that separates it from commutative deformation theory.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 12:57:11 GMT" } ]
2007-12-14T00:00:00
[ [ "Eriksen", "Eivind", "" ] ]
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712.2147
Alexander Ukhlov D
V. Gol'dshtein and A. Ukhlov
Sobolev homeomorphisms and Poincare inequality
In the first version, there was an inaccuracy in Theorem 4. In the revised version added additional assumptions
null
null
null
math.FA math.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study global regularity properties of Sobolev homeomorphisms on $n$-dimensional Riemannian manifolds under the assumption of $p$-integrability of its first weak derivatives in degree $p\geq n-1$. We prove that inverse homeomorphisms have integrable first weak derivatives. For the case $p>n$ we obtain necessary conditions for existence of Sobolev homeomorphisms between manifolds. These necessary conditions based on Poincar\'e type inequality: $$ \inf_{c\in \mathbb R} \|u-c\mid L_{\infty}(M)\|\leq K \|u\mid L^1_{\infty}(M)\|. $$ As a corollary we obtain the following geometrical necessary condition: {\em If there exists a Sobolev homeomorphisms $\phi: M \to M'$, $\phi\in W^1_p(M, M')$, $p>n$, $J(x,\phi)\ne 0$ a. e. in $M$, of compact smooth Riemannian manifold $M$ onto Riemannian manifold $M'$ then the manifold $M'$ has finite geodesic diameter.}}
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:11:31 GMT" }, { "version": "v2", "created": "Thu, 5 Jun 2008 19:34:00 GMT" } ]
2008-06-05T00:00:00
[ [ "Gol'dshtein", "V.", "" ], [ "Ukhlov", "A.", "" ] ]
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712.2148
Heung-Sun Sim
Seok-Chan Youn, Hyun-Woo Lee, H.-S. Sim
Nonequilibrium Dephasing in an Electronic Mach-Zehnder Interferometer
4 pages, 3 figures; some typos are corrected; published version
Phys. Rev. Lett. 100, 196807 (2008)
10.1103/PhysRevLett.100.196807
null
cond-mat.mes-hall
null
We study nonequilibrium dephasing in an electronic Mach-Zehnder interferometer. We demonstrate that the shot noise at the beam splitter of the interferometer generates an ensemble of nonequilibrium electron density configurations and that electron interactions induce configuration-specific phase shifts of an interfering electron. The resulting dephasing exhibits two characteristic features, a lobe pattern in the visibility and phase jumps of $\pi$, in good agreement with experimental data.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:20:49 GMT" }, { "version": "v2", "created": "Fri, 14 Dec 2007 02:56:54 GMT" }, { "version": "v3", "created": "Sat, 17 May 2008 02:46:58 GMT" } ]
2009-11-13T00:00:00
[ [ "Youn", "Seok-Chan", "" ], [ "Lee", "Hyun-Woo", "" ], [ "Sim", "H. -S.", "" ] ]
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712.2149
Giuseppe Falzetta doc
Giuseppe Falzetta, Francesco Longo and Alba Zanini
GEANT4 and CREME96 comparison using only proton fluxes
16 pages, 11 figures, CREME96 and GEANT4 compare
null
null
null
physics.comp-ph physics.space-ph
null
CREME96 and GEANT4 are two well known particle transport codes through matter in space science. We present a comparison between the proton fluxes outgoing from an aluminium target, obtained by using both tools. The primary proton flux is obtained by CREME96 only, covering an energy range from MeV to hundreds GeV with the same result in both cases. We studied different thickness targets and two different GEANT4 physics lists in order to show how the spectra of the outgoing proton fluxes are modified. Our findings show consistent agreement of simulation data by each tool, with regards both GEANT4 physics lists and every thickness target analysed.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:01:33 GMT" }, { "version": "v2", "created": "Mon, 12 May 2008 10:45:36 GMT" } ]
2008-05-12T00:00:00
[ [ "Falzetta", "Giuseppe", "" ], [ "Longo", "Francesco", "" ], [ "Zanini", "Alba", "" ] ]
[ 0.0199725125, 0.0114063499, 0.1155878231, -0.0028646158, 0.0311117806, 0.0525304414, -0.0270208679, 0.0679560527, 0.0660799593, -0.0602953583, -0.0112890946, 0.0139794555, -0.0125593618, 0.0259785969, 0.0138882566, 0.0088267298, 0.0014363793, 0.0250014681, -0.0433584601, 0.0485958718, -0.0157122314, 0.0243761055, 0.0732716322, -0.0623277873, -0.0830689743, -0.1127736866, 0.0595657714, 0.0051690112, 0.0418471694, -0.018956298, 0.0452866629, -0.0287666712, 0.0105464766, -0.0948987454, -0.0576375686, -0.0390330367, -0.0222394504, 0.0707701817, -0.0609207228, 0.0210017543, 0.0535727143, 0.0217964854, 0.0078886859, 0.0465373881, -0.0429936647, -0.0398668535, -0.0172886644, -0.0602953583, 0.0793168023, -0.0010341279, 0.0395020582, 0.0686856359, 0.0035860627, 0.0012889957, 0.0481789634, -0.0923451856, 0.038850639, -0.0160509683, -0.004986614, -0.0295744315, -0.0439838246, -0.0014998927, 0.0483353026, 0.0408309549, -0.0708222911, 0.0081362259, -0.0067747594, -0.0054198075, 0.0576375686, 0.0195686314, -0.055240348, 0.0231253803, 0.0495860279, -0.0908338875, -0.0454690605, -0.0345252156, 0.0064913924, -0.0196337737, 0.0217964854, 0.0660799593, 0.0572206602, -0.0226042457, -0.0196858868, -0.1269485652, 0.0016220338, -0.041821111, 0.0352548063, -0.1057904735, -0.1383093148, -0.0574291162, 0.0209496412, -0.025288092, -0.0298349988, 0.0698842481, 0.0926578641, -0.0341604203, 0.0488303825, -0.085674651, 0.0879676491, 0.1370586008, 0.0680081621, 0.0386161283, -0.014005512, -0.0675912574, 0.1888594478, -0.0106051043, 0.0394760035, -0.0604517013, -0.0261479653, 0.1441460401, 0.0950550884, -0.0296526011, 0.0122401668, 0.0538332798, -0.0696757957, 0.0307990983, -0.0779097378, -0.0214316919, -0.0136537459, 0.1009960324, -0.1178808138, 0.1187146306, 0.0467718989, -0.1011523679, 0.1478982121, 0.0025975341, 0.0484655872, -0.1299711615, -0.0740533322, 0.0371569507, 0.0637348518, -0.1044876352, -0.0230472106, 0.0140445977, -0.0517487414, 0.0899479613, -0.0490648933, -0.0216401462, 0.0003625555, 0.0354111455, -0.0519050807, 0.0702490434, 0.0150868678, 0.0986509174, 0.0272553787, -0.0359322838, -0.0560741648, -0.0006668904, 0.0453127176, 0.0461986475, -0.0451563783, -0.0648292378, -0.0527128391, -0.047814168, -0.015490748, -0.1205907166, 0.0955762193, 0.0927620903, -0.0684250742, -0.0650376901, -0.0430978946, -0.0267863572, -0.0559178218, -0.0272032656, 0.0543544181, 0.0821309313, -0.1069369763, -0.0089700418, -0.1152751371, 0.0115692047, -0.0008159025, 0.018760873, -0.0596178845, -0.0443486162, 0.0605038144, -0.034394931, -0.0243370198, -0.0082209101, -0.0966184959, -0.0364013053, 0.0418471694, 0.0440619923, 0.1042791829, 0.0266039595, -0.0394499451, -0.0152822938, 0.0144875627, 0.0543023013, -0.0479965657, 0.0338216834, 0.0644123256, 0.0664968714, 0.026434591, 0.0981297866, -0.1435206681, -0.1320556998, 0.1573828757, 0.0823393837, -0.0247930139, 0.0061135693, -0.0008818587, 0.0265127607, 0.0743660107, -0.0373132899, -0.0595657714, -0.0230993237, 0.1206949428, 0.0038075452, 0.0141488248, 0.0475796573, 0.0175752901, 0.1292415708, -0.0256007742, -0.0244803336, -0.1079792455, -0.0615981966, -0.0805675238, 0.154151842, 0.0618066527, 0.085518308, -0.0572727732, 0.0624320135, 0.0516705699, 0.0029981567, -0.0622235611, 0.0627968088, 0.0685293004, 0.0189953838, -0.0307469852, -0.1147540063, -0.0235032048, 0.1274697036, -0.1218414456, -0.0144745344, -0.0016651903, -0.0562826172, 0.0650376901, -0.0467458405, -0.0050550126, -0.0762421042, -0.0232686941, 0.019803144, 0.017471062, -0.0661841854, -0.0256268308, -0.014800244, -0.0463028774, -0.0710307509, 0.0329878666, -0.0305124745, 0.0476317704, -0.0069701853, 0.1266358942, -0.0657151639, 0.0575333424, -0.0331181511 ]
712.215
Cliff Spiegelman
Cliff Spiegelman, William A. Tobin, William D. James, Simon J. Sheather, Stuart Wexler, D. Max Roundhill
Chemical and forensic analysis of JFK assassination bullet lots: Is a second shooter possible?
Published in at http://dx.doi.org/10.1214/07-AOAS119 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annals of Applied Statistics 2007, Vol. 1, No. 2, 287-301
10.1214/07-AOAS119
IMS-AOAS-AOAS119
stat.AP
null
The assassination of President John Fitzgerald Kennedy (JFK) traumatized the nation. In this paper we show that evidence used to rule out a second assassin is fundamentally flawed. This paper discusses new compositional analyses of bullets reportedly to have been derived from the same batch as those used in the assassination. The new analyses show that the bullet fragments involved in the assassination are not nearly as rare as previously reported. In particular, the new test results are compared to key bullet composition testimony presented before the House Select Committee on Assassinations (HSCA). Matches of bullets within the same box of bullets are shown to be much more likely than indicated in the House Select Committee on Assassinations' testimony. Additionally, we show that one of the ten test bullets is considered a match to one or more assassination fragments. This finding means that the bullet fragments from the assassination that match could have come from three or more separate bullets. Finally, this paper presents a case for reanalyzing the assassination bullet fragments and conducting the necessary supporting scientific studies. These analyses will shed light on whether the five bullet fragments constitute three or more separate bullets. If the assassination fragments are derived from three or more separate bullets, then a second assassin is likely, as the additional bullet would not easily be attributable to the main suspect, Mr. Oswald, under widely accepted shooting scenarios [see Posner (1993), Case Closed, Bantam, New York].
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:29:54 GMT" } ]
2009-09-29T00:00:00
[ [ "Spiegelman", "Cliff", "" ], [ "Tobin", "William A.", "" ], [ "James", "William D.", "" ], [ "Sheather", "Simon J.", "" ], [ "Wexler", "Stuart", "" ], [ "Roundhill", "D. Max", "" ] ]
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712.2151
Seung-il Nam
Seung-il Nam and Hyun-Chul Kim
Magnetic susceptibility of QCD vacuum at finite density from the nonlocal chiral quark model
5 pages, 2 figures, Talk given at International Workshop Chiral07, Osaka, Japan, 13-16 Nov 2007
null
null
YITP-07-89,PNU-NTG-13/2007,PNU-NuRI-13/2007
hep-ph
null
We present in this talk a recent investigation on the magnetic susceptibility (chi) of the QCD vacuum at finite density, utilizing the nonlocal chiral quark model from the instanton vacuum. We take into account the nonzero current-quark mass (m_q) explicitly to consider the effect of explicit flavor SU(3) symmetry breaking. It turns out that, when we turn on the current-quark mass, chi becomes smaller, indicating less response to the externally induced electromagnetic field, in comparison to that for m_q=0.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:32:35 GMT" }, { "version": "v2", "created": "Sun, 17 Feb 2008 12:21:59 GMT" } ]
2008-02-17T00:00:00
[ [ "Nam", "Seung-il", "" ], [ "Kim", "Hyun-Chul", "" ] ]
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712.2152
Sergey Shklyaev
S. Shklyaev, M. Khenner, A. A. Alabuzhev
Analysis of vibration impact on stability of dewetting thin liquid film
19 pages, 11 figures
Phys. Rev. E 77, 036320 (2008)
10.1103/PhysRevE.77.036320
null
physics.flu-dyn
null
Dynamics of a thin dewetting liquid film on a vertically oscillating substrate is considered. We assume moderate vibration frequency and large (compared to the mean film thickness) vibration amplitude. Using the lubrication approximation and the averaging method, we formulate the coupled sets of equations governing the pulsatile and the averaged fluid flows in the film, and then derive the nonlinear amplitude equation for the averaged film thickness. We show that there exists a window in the frequency-amplitude domain where the parametric and shear-flow instabilities of the pulsatile flow do not emerge. As a consequence, in this window the averaged description is reasonable and the amplitude equation holds. The linear and nonlinear analyses of the amplitude equation and the numerical computations show that such vibration stabilizes the film against dewetting and rupture.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:35:01 GMT" } ]
2010-02-18T00:00:00
[ [ "Shklyaev", "S.", "" ], [ "Khenner", "M.", "" ], [ "Alabuzhev", "A. A.", "" ] ]
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712.2153
Luis Paris
Luis Paris
Small index subgroups of the mapping class group
null
null
null
null
math.GT math.GR
null
We prove that the mapping class group of a closed oriented surface of genus $\rho \ge 3$ has no proper subgroup of index $\le 4 \rho +4$.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:35:20 GMT" } ]
2007-12-14T00:00:00
[ [ "Paris", "Luis", "" ] ]
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712.2154
Katarzyna Ostasiewicz
A. Radosz, A. T. Augousti, K. Ostasiewicz
Doppler effect in Schwarzschild geometry
null
J.Phys.Conf.Ser.104:012008,2008
10.1088/1742-6596/104/1/012008
null
gr-qc
null
The Doppler shift considered in general relativity involves mixed contributions of distinct, gravitational and kinematical origins and for most metrics or trajectories it takes a complex form. The expression for the Doppler shift may simplify due to particular symmetries. In Schwarzschild spacetime it factorizes in the case of radial fall for an observer and radial null geodesic. The resulting expression is composed of factors that can be identified with contributions arising from classical, special relativistic and general relativistic origins. This result turns out to be more general: it holds for the whole class of observers travelling parallel to the spatial path of null geodesics when receiving the signal. It also holds for a particular type of in-fall in the case of a Kerr metric.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:48:09 GMT" } ]
2008-11-26T00:00:00
[ [ "Radosz", "A.", "" ], [ "Augousti", "A. T.", "" ], [ "Ostasiewicz", "K.", "" ] ]
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712.2155
Bertha Cuadros-Melgar
B. Cuadros-Melgar, C.E. Pellicer
Instability of the Time Dependent Horava-Witten Model
12 pages, 4 figures. References added. Some comments clarified. Accepted in Phys. Rev. D
Phys.Rev.D77:104030,2008
10.1103/PhysRevD.77.104030
null
hep-th gr-qc
null
We consider scalar perturbations in the time-dependent Ho\u{r}ava-Witten Model in order to probe its stability. We show that during the non-singular epoque the model evolves without instabilities until it encounters the curvature singularity where a big crunch is supposed to occur. We compute the frequencies of the scalar field oscillation during the stable period and show how the oscillations can be used to prove the presence of such a singularity.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:57:10 GMT" }, { "version": "v2", "created": "Sat, 3 May 2008 20:48:24 GMT" } ]
2008-11-26T00:00:00
[ [ "Cuadros-Melgar", "B.", "" ], [ "Pellicer", "C. E.", "" ] ]
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712.2156
Mauricio B. Magro
F. de Campos, O. J. P. Eboli, M. B. Magro, W. Porod, D. Restrepo, M. Hirsch and J. W. F. Valle
Probing bilinear R-parity violating supergravity at the LHC
Corrected version. To appear at JHEP
JHEP 0805:048,2008
10.1088/1126-6708/2008/05/048
null
hep-ph
null
We study the collider phenomenology of bilinear R-parity violating supergravity, the simplest effective model for supersymmetric neutrino masses accounting for the current neutrino oscillation data. At the CERN Large Hadron Collider the center-of-mass energy will be high enough to probe directly these models through the search for the superpartners of the Standard Model (SM) particles. We analyze the impact of R-parity violation on the canonical supersymmetry searches - that is, we examine how the decay of the lightest supersymmetric particle (LSP) via bilinear R-parity violating interactions degrades the average expected missing momentum of the reactions and show how this diminishes the reach in the 'usual' channels for supersymmetry searches. However, the R-parity violating interactions lead to an enhancement of the final states containing isolated same-sign di-leptons and trileptons, compensating the reach loss in the fully inclusive channel. We show how the searches for displaced vertices associated to LSP decay substantially increase the coverage in supergravity parameter space, giving the corresponding reaches for two reference luminosities of 10 and 100 fb$^{-1}$ and compare with those of the R-parity conserving minimal supergravity model.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 13:58:53 GMT" }, { "version": "v2", "created": "Fri, 9 May 2008 23:04:09 GMT" } ]
2009-05-22T00:00:00
[ [ "de Campos", "F.", "" ], [ "Eboli", "O. J. P.", "" ], [ "Magro", "M. B.", "" ], [ "Porod", "W.", "" ], [ "Restrepo", "D.", "" ], [ "Hirsch", "M.", "" ], [ "Valle", "J. W. F.", "" ] ]
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712.2157
M. Ebrahim Fouladvand
M. Ebrahim Foulaadvand and Sommayeh Belbasi
Vehicular traffic flow at a non-signalised intersection
Revtex, 5 pages, 9 eps figures
J. Phys. A: Math. Theor. 40, 8289-8297 (2007)
10.1088/1751-8113/40/29/006
null
physics.soc-ph physics.gen-ph
null
We have developed a modified Nagel-Schreckenberg cellular automata model for describing a conflicting vehicular traffic flow at the intersection of two streets. No traffic lights control the traffic flow. The approaching cars to the intersection yield to each other to avoid collision. Closed boundary condition is applied to the streets. Extensive Monte Carlo simulations is taken into account to find the model characteristics. In particular, we obtain the fundamental diagrams and show that the effect of interaction of two streets can be regarded as a dynamic impurity located at the intersection point. Our results suggest that yielding mechanism gives rise to a high total flow throughout the intersection especially in the low density regime. In some ranges of densities, yielding mechanism even improves and regulates the flow in comparison to the absence of perpendicular flow.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:08:56 GMT" } ]
2009-11-13T00:00:00
[ [ "Foulaadvand", "M. Ebrahim", "" ], [ "Belbasi", "Sommayeh", "" ] ]
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712.2158
Ludmil Hadjiivanov
Ludmil Hadjiivanov, Paolo Furlan
Extended su(2)_k and restricted U_q sl(2)
11 pages, extended version of a talk at the International Workshop "Lie Theory and Its Applications in Physics VII" (Varna, Bulgaria, June 2007), to appear in the proceedings (eds. V. Dobrev et.al., Heron Press, Sofia)
null
null
null
hep-th math-ph math.MP math.QA
null
Global gauge symmetry becomes more intricate in low dimensional QFT. We survey the mathematical concepts leading to the relevant analogues of the (D=4) Doplicher-Haag-Roberts theory of superselection sectors and internal symmetry. We also review a recently uncovered duality between braid and quantum group representations in an extension of the chiral su(2)_k WZNW model for nonnegative integer level k.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:22:47 GMT" } ]
2007-12-14T00:00:00
[ [ "Hadjiivanov", "Ludmil", "" ], [ "Furlan", "Paolo", "" ] ]
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712.2159
Jessy Jose
Jessy Jose, A.K. Pandey, D.K. Ojha, K. Ogura, W.P. Chen, B.C. Bhatt, S.K. Ghosh, H. Mito, G. Maheswar and Saurabh Sharma
Stellar contents and star formation in the young open cluster Stock 8
48 pages, 29 figures, accepted for publication in MNRAS
null
10.1111/j.1365-2966.2007.12825.x
null
astro-ph
null
We present $UBVI_c$ CCD photometry of the young open cluster Stock 8 with the aim to study the basic properties and star formation scenario in this region. The radius of the cluster is found to be $\sim 6^{\prime}$ ($\sim 3.6$ pc) and the reddening within the cluster region varies from $E(B-V)=0.40$ to 0.60 mag. The cluster is located at a distance of $2.05 \pm 0.10$ kpc. Using H$\alpha$ slitless spectroscopy and 2MASS NIR data we identified H$\alpha$ emission and NIR excess young stellar objects (YSOs), respectively. The colour-magnitude diagrams of these YSOs reveal that majority of these objects have ages between 1 to 5 Myr indicating a non-coeval star formation in the cluster. Massive stars in the cluster region reveal an average age of $\le$ 2 Myr. In the cluster region ($r \le 6^\prime$) the slope of the mass function (MF), $\Gamma$, in the mass range $\sim 1.0 \le M/M_\odot < 13.4$ can be represented by a power law having a slope of $-1.38\pm0.12$, which agrees well with Salpeter value (-1.35). In the mass range $0.3 \le M/M_\odot < 1.0$, the MF is also found to follow a power law with a shallower slope of $\Gamma = -0.58\pm 0.23$ indicating a break in the slope of the IMF at $\sim 1 M_\odot$. The slope of the $K$-band luminosity function for the cluster ($r \le 6^\prime$) is found to be $0.31\pm0.02$, which is smaller than the average value ($\sim$ 0.4) obtained for embedded star clusters. A significant number of YSOs are distributed along a Nebulous Stream towards the east side of the cluster. A small cluster is embedded in the Nebulous Stream. The YSOs lying in the Nebulous Stream and in the embedded cluster are found to be younger than the stars in the cluster Stock 8. It appears that star formation activity in the Nebulous Stream and embedded cluster may be independent from that of Stock 8.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:28:52 GMT" } ]
2009-11-13T00:00:00
[ [ "Jose", "Jessy", "" ], [ "Pandey", "A. K.", "" ], [ "Ojha", "D. K.", "" ], [ "Ogura", "K.", "" ], [ "Chen", "W. P.", "" ], [ "Bhatt", "B. C.", "" ], [ "Ghosh", "S. K.", "" ], [ "Mito", "H.", "" ], [ "Maheswar", "G.", "" ], [ "Sharma", "Saurabh", "" ] ]
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712.216
Emmanuel Guitter
J. Bouttier and E. Guitter
Statistics of geodesics in large quadrangulations
37 pages, 18 color figures, improved version with several clarifications (mostly in sections 2.1 and 2.4) and one added section (3.1) on ensembles of random quadrangulations
J. Phys. A: Math. Theor. 41 (2008) 145001
10.1088/1751-8113/41/14/145001
null
math-ph math.CO math.MP
null
We study the statistical properties of geodesics, i.e. paths of minimal length, in large random planar quadrangulations. We extend Schaeffer's well-labeled tree bijection to the case of quadrangulations with a marked geodesic, leading to the notion of "spine trees", amenable to a direct enumeration. We obtain the generating functions for quadrangulations with a marked geodesic of fixed length, as well as with a set of "confluent geodesics", i.e. a collection of non-intersecting minimal paths connecting two given points. In the limit of quadrangulations with a large area n, we find in particular an average number 3*2^i of geodesics between two fixed points at distance i>>1 from each other. We show that, for generic endpoints, two confluent geodesics remain close to each other and have an extensive number of contacts. This property fails for a few "exceptional" endpoints which can be linked by truly distinct geodesics. Results are presented both in the case of finite length i and in the scaling limit i ~ n^(1/4). In particular, we give the scaling distribution of the exceptional points.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:34:27 GMT" }, { "version": "v2", "created": "Fri, 7 Mar 2008 14:57:04 GMT" } ]
2008-05-15T00:00:00
[ [ "Bouttier", "J.", "" ], [ "Guitter", "E.", "" ] ]
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712.2161
Robert Douglas
R. J. Douglas (Aberystwyth University, UK)
Non-existence of polar factorisations and polar inclusion of a vector-valued mapping
9 pages, 0 figures, to be published in the International Journal of Pure and Applied Mathematics, IJPAM, 41, no. 3, 2007, 363-374
null
null
null
math.FA
null
This paper proves some results concerning the polar factorisation of an integrable vector-valued function u into the composition of the gradient of a convex function with a measure-preserving mapping. Not every integrable function has a polar factorisation; we extend the class of counterexamples. We introduce a generalisation: u has a polar inclusion if u(x) belongs to the subdifferential of the convex function at y for almost every pair (x,y) with respect to a measure-preserving plan. Given a regularity assumption, we show that such measure-preserving plans are exactly the minimisers of a Monge-Kantorovich optimisation problem.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:43:28 GMT" } ]
2007-12-14T00:00:00
[ [ "Douglas", "R. J.", "", "Aberystwyth University, UK" ] ]
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712.2162
Leonardo Gualtieri
A. Colaiuda, V. Ferrari, L. Gualtieri, J.A. Pons
Relativistic models of magnetars: structure and deformations
25 pages, 9 figures, submitted to MNRAS
Mon.Not.Roy.Astron.Soc.385:2080-2096,2008
10.1111/j.1365-2966.2008.12966.x
null
astro-ph gr-qc
null
We find numerical solutions of the coupled system of Einstein-Maxwell's equations with a linear approach, in which the magnetic field acts as a perturbation of a spherical neutron star. In our study, magnetic fields having both poloidal and toroidal components are considered, and higher order multipoles are also included. We evaluate the deformations induced by different field configurations, paying special attention to those for which the star has a prolate shape. We also explore the dependence of the stellar deformation on the particular choice of the equation of state and on the mass of the star. Our results show that, for neutron stars with mass M = 1.4 Msun and surface magnetic fields of the order of 10^15 G, a quadrupole ellipticity of the order of 10^(-6) - 10^(-5) should be expected. Low mass neutron stars are in principle subject to larger deformations (quadrupole ellipticities up to 10^(-3) in the most extreme case). The effect of quadrupolar magnetic fields is comparable to that of dipolar components. A magnetic field permeating the whole star is normally needed to obtain negative quadrupole ellipticities, while fields confined to the crust typically produce positive quadrupole ellipticities.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:49:23 GMT" } ]
2009-11-13T00:00:00
[ [ "Colaiuda", "A.", "" ], [ "Ferrari", "V.", "" ], [ "Gualtieri", "L.", "" ], [ "Pons", "J. A.", "" ] ]
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712.2163
Tsuyoshi Ito
Tsuyoshi Ito, Hirotada Kobayashi, Daniel Preda, Xiaoming Sun, Andrew C.-C. Yao
Generalized Tsirelson Inequalities, Commuting-Operator Provers, and Multi-Prover Interactive Proof Systems
20 pages. v2: An incorrect statement in the abstract about the two-party case is corrected. Relation between this work and a preliminary work by Sun, Yao and Preda is clarified
null
null
null
quant-ph
null
A central question in quantum information theory and computational complexity is how powerful nonlocal strategies are in cooperative games with imperfect information, such as multi-prover interactive proof systems. This paper develops a new method for proving limits of nonlocal strategies that make use of prior entanglement among players (or, provers, in the terminology of multi-prover interactive proofs). Instead of proving the limits for usual isolated provers who initially share entanglement, this paper proves the limits for "commuting-operator provers", who share private space, but can apply only such operators that are commutative with any operator applied by other provers. Commuting-operator provers are at least as powerful as usual isolated but prior-entangled provers, and thus, limits for commuting-operator provers immediately give limits for usual entangled provers. Using this method, we obtain an n-party generalization of the Tsirelson bound for the Clauser-Horne- Shimony-Holt inequality for every n. Our bounds are tight in the sense that, in every n-party case, the equality is achievable by a usual nonlocal strategy with prior entanglement. We also apply our method to a 3-prover 1-round binary interactive proof for NEXP. Combined with the technique developed by Kempe, Kobayashi, Matsumoto, Toner and Vidick to analyze the soundness of the proof system, it is proved to be NP-hard to distinguish whether the entangled value of a 3-prover 1-round binary-answer game is equal to 1 or at most 1-1/p(n) for some polynomial p, where n is the number of questions. This is in contrast to the 2-prover 1-round binary-answer case, where the corresponding problem is efficiently decidable. Alternatively, NEXP has a 3-prover 1-round binary interactive proof system with perfect completeness and soundness 1-2^{-poly}.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 14:50:48 GMT" }, { "version": "v2", "created": "Fri, 11 Apr 2008 20:05:12 GMT" } ]
2008-04-11T00:00:00
[ [ "Ito", "Tsuyoshi", "" ], [ "Kobayashi", "Hirotada", "" ], [ "Preda", "Daniel", "" ], [ "Sun", "Xiaoming", "" ], [ "Yao", "Andrew C. -C.", "" ] ]
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712.2164
George Siopsis
James Alsup and George Siopsis
Bjorken flow from an AdS Schwarzschild black hole
5 pages in two-column RevTeX; sharpened discussion to appear in PRL
Phys.Rev.Lett.101:031602,2008
10.1103/PhysRevLett.101.031602
UTHET-07-1101
hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a large black hole in asymptotically AdS spacetime of arbitrary dimension with a Minkowski boundary. By performing an appropriate slicing as we approach the boundary, we obtain via holographic renormalization a gauge theory fluid obeying Bjorken hydrodynamics in the limit of large longitudinal proper time. The metric we obtain reproduces to leading order the metric recently found as a direct solution of the Einstein equations in five dimensions. Our results are also in agreement with recent exact results in three dimensions.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:06:59 GMT" }, { "version": "v2", "created": "Sat, 5 Jul 2008 05:48:46 GMT" } ]
2008-11-26T00:00:00
[ [ "Alsup", "James", "" ], [ "Siopsis", "George", "" ] ]
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712.2165
Giuliano Niccoli G.
G. Delfino and G. Niccoli
Isomorphism of critical and off-critical operator spaces in two-dimensional quantum field theory
16 pages, typo corrected in (2.17)
Nucl.Phys.B799:364-378,2008
10.1016/j.nuclphysb.2008.01.019
null
hep-th cond-mat.stat-mech math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the simplest quantum field theory originating from a non-trivial fixed point of the renormalization group, the Lee-Yang model, we show that the operator space determined by the particle dynamics in the massive phase and that prescribed by conformal symmetry at criticality coincide.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:07:31 GMT" }, { "version": "v2", "created": "Thu, 30 Oct 2008 10:59:22 GMT" } ]
2008-11-26T00:00:00
[ [ "Delfino", "G.", "" ], [ "Niccoli", "G.", "" ] ]
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712.2166
P\"ar-Anders S\"oderstr\"om
P.-A. S\"oderstr\"om
Detection of fast neutrons and digital pulse-shape discrimination between neutrons and gamma rays
Submitted to the proceedings of International School of Physics "Enrico Fermi" COURSE CLXIX - Nuclear Structure far from Stability: new Physics and new Technology. 5 pages, 2 figures
null
null
null
nucl-ex physics.ins-det
null
The basic principles of detection of fast neutrons with liquid scintillator detectors are reviewed, together with a real example in the form of the Neutron Wall array. Two of the challenges in neutron detection, discrimination of neutrons and gamma rays and identification of cross talk between detectors due to neutron scattering, are briefly discussed, as well as possible solutions to these problems. The possibilities of using digital techniques for pulse-shape discrimination are examined. Results from a digital and analog versions of the zero cross-over algorithm are presented. The digital pulse-shape discrimination is shown to give, at least, as good results as the corresponding analogue version.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:08:58 GMT" }, { "version": "v2", "created": "Tue, 15 Apr 2008 07:05:39 GMT" } ]
2008-12-08T00:00:00
[ [ "Söderström", "P. -A.", "" ] ]
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712.2167
Gregory Verchota
Gregory C. Verchota
Existence of positive definite noncoercive sums of squares
27 pages
null
null
null
math.AG math.AP
null
Positive definite forms $f$ which are sums of squares are constructed to have the additional property that the members of any collection of forms whose squares sum to $f$ must share a nontrivial complex root.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 16:08:32 GMT" } ]
2007-12-14T00:00:00
[ [ "Verchota", "Gregory C.", "" ] ]
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712.2168
Francoise Sandoz-Guermond
Marc-Eric Bobiller-Chaumon (GRePS), Michel Dubois (LIP - PC2S), Fran\c{c}oise Sandoz-Guermond (LIESP)
Study of conditions of use of E-services accessible to visually disabled persons
4 pages visible \`a http://ceur-ws.org/Vol-285
Dans CEUR Workshop Proceedings - DEGAS'07 : Workshop of Design & Evaluation of e-Government Applications and services, Rio de Janeiro : Br\'esil (2006)
null
null
cs.HC
null
The aim of this paper is to determine the expectations that French-speaking disabled persons have for electronic administrative sites (utility). At the same time, it is a matter of identifying the difficulties of use that the manipulation of these E-services poses concretely for blind people (usability) and of evaluating the psychosocial impacts on the way of life of these people with specific needs. We show that the lack of numerical accessibility is likely to accentuate the social exclusion of which these people are victim by establishing a numerical glass ceiling.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:14:01 GMT" } ]
2007-12-14T00:00:00
[ [ "Bobiller-Chaumon", "Marc-Eric", "", "GRePS" ], [ "Dubois", "Michel", "", "LIP - PC2S" ], [ "Sandoz-Guermond", "Françoise", "", "LIESP" ] ]
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712.2169
Luigina Feretti
Luigina Feretti
Radio emission in clusters and connection to X-ray emission
Proceedings of the workshop "Simbol-X: The Hard X-ray Universe in Focus", to appear in Memories of SAIt, (6 pages and 3 figures)
null
null
null
astro-ph
null
The most spectacular aspect of cluster radio emission is represented by the large-scale diffuse radio sources, which cannot be obviously associated with any individual galaxy. These sources demonstrate the existence of relativistic particles and magnetic fields in the cluster volume, thus indicating the presence of non-thermal processes in the hot intracluster medium. The knowledge of the properties of these sources has increased significantly in recent years, owing to sensitive radio images and to the development of theoretical models. An important piece of information on the origin and evolution of these sources can be obtained by the cluster X-ray emission of thermal origin, and by its relation to the radio emission. Moreover, non-thermal X-ray emission of inverse Compton origin gives direct information on the energy density of radio emitting particles and the intensity of magnetic field.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:20:29 GMT" } ]
2007-12-14T00:00:00
[ [ "Feretti", "Luigina", "" ] ]
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712.217
Uri Jacob
Uri Jacob and Tsvi Piran
Lorentz-violation-induced arrival delays of cosmological particles
references to additional studies of GRB data added
JCAP 0801:031,2008
10.1088/1475-7516/2008/01/031
null
astro-ph hep-ph
null
We point out that previous studies of possible Lorentz-violating effects in astronomical time-of-flight data did not take into account the entire implications of the universe's cosmological expansion. We present the derivation of the accurate formulation of the problem and show that the resulting correction of the limits on Lorentz violation is significant.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 17:24:54 GMT" }, { "version": "v2", "created": "Wed, 16 Jan 2008 18:57:59 GMT" }, { "version": "v3", "created": "Sun, 3 Feb 2008 21:35:33 GMT" } ]
2009-01-09T00:00:00
[ [ "Jacob", "Uri", "" ], [ "Piran", "Tsvi", "" ] ]
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712.2171
Andrea Ferrantelli
Andrea Ferrantelli
Scattering of massive W bosons into gravitinos and tree unitarity in broken supergravity
26 pages, 17 figures. Uses JHEP3.cls, epsfig.sty and axodraw.sty. Some references, together with Ward identities in the basis of mass eigenstates, have been added. Version accepted for publication in JHEP
JHEP 0901:070,2009
10.1088/1126-6708/2009/01/070
HIP-2007-71-TH
hep-ph astro-ph.CO hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The WW scattering into gravitino and gaugino is here investigated in the broken phase, by using both gauge and mass eigenstates. Differently from what is obtained for unbroken gauge symmetry, we find in the scattering amplitudes new structures, which can lead to violation of unitarity above a certain scale. This happens because, in the annihilation diagram, the longitudinal degrees of freedom in the propagator of the gauge bosons disappear from the amplitude, by virtue of the SUGRA vertex. We show that the longitudinal polarizations of the on-shell W become strongly interacting in the high energy limit, and that the inclusion of diagrams with off-shell scalars of the MSSM does not cancel the divergences.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 16:05:57 GMT" }, { "version": "v2", "created": "Tue, 18 Dec 2007 15:20:26 GMT" }, { "version": "v3", "created": "Thu, 20 Dec 2007 12:34:46 GMT" }, { "version": "v4", "created": "Tue, 8 Jan 2008 22:25:27 GMT" }, { "version": "v5", "created": "Tue, 25 Nov 2008 10:18:24 GMT" }, { "version": "v6", "created": "Mon, 26 Jan 2009 11:53:52 GMT" } ]
2010-02-16T00:00:00
[ [ "Ferrantelli", "Andrea", "" ] ]
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712.2172
Matthew Morrow
Matthew T. Morrow
Integration on valuation fields over local fields
null
null
null
null
math.NT math.AG
null
We present elements of a theory of translation-invariant integration, measure, and harmonic analysis on a valuation field with local field as residue field. This extends the work of Fesenko. Applications to zeta integrals for two-dimensional local fields are then considered.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 16:03:47 GMT" } ]
2007-12-14T00:00:00
[ [ "Morrow", "Matthew T.", "" ] ]
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712.2173
Piotr Su{\l}kowski
Piotr Su{\l}kowski
Calabi-Yau crystals in topological string theory
PhD thesis, June 2007, 200 pages, introductory chapter in Polish
null
null
null
hep-th
null
This thesis is concerned with a realisation of topological theories in terms of statistical models known as Calabi-Yau crystals. The thesis starts with an introduction and review of topological field and string theories. Subsequently several new results are presented. The main focus of the thesis is on the topological string theory. In this case crystal models correspond to three-dimensional partitions and their relations with the topological vertex theory and knot invariants are studied. Two-dimensional crystal models corresponding to topological gauge theories on ALE spaces are also introduced and analysed. Essential mathematical tools are summarised in appendices.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:45:52 GMT" } ]
2007-12-14T00:00:00
[ [ "Sułkowski", "Piotr", "" ] ]
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712.2174
St\'ephane Ouvry
Stephane Ouvry
Anyons and lowest Landau level Anyons
32 pages, 5 figures (pdflatex)
Seminaire Poincare 11:77-107,2007
null
null
cond-mat.stat-mech cond-mat.mes-hall
null
A review on the Anyon model and the lowest Landau level Anyon model is presented.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:37:54 GMT" } ]
2009-11-19T00:00:00
[ [ "Ouvry", "Stephane", "" ] ]
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712.2175
Matthew Morrow
Matthew T. Morrow
Integration on product spaces and GL_n of a valuation field over a local field
null
null
null
null
math.NT math.AG
null
We present elements of a theory of translation-invariant integration on finite dimensional vector spaces and on GL_n over a valuation field with local field as residue field. We then discuss the case of an arbitrary algebraic group. This extends the work of Fesenko.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 16:16:31 GMT" } ]
2007-12-14T00:00:00
[ [ "Morrow", "Matthew T.", "" ] ]
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712.2176
Georg Raffelt
Andreu Esteban-Pretel, Sergio Pastor, Ricard Tomas, Georg Raffelt, Gunter Sigl
Multi-angle effects in collective supernova neutrino oscillations
Contribution to TAUP 07, Sendai, Japan
J.Phys.Conf.Ser.120:052021,2008
10.1088/1742-6596/120/5/052021
MPP-2007-188
hep-ph
null
We study two-flavor collective neutrino oscillations in the dense-neutrino region above the neutrino sphere in a supernova (SN). The angular dependence of the neutrino-neutrino interaction potential causes "multi-angle" effects that can lead either to complete kinematical decoherence in flavor space or only to small differences between different trajectories. This nonlinear system switches abruptly between "self-maintained coherence" and "self-induced decoherence" among the angular modes, depending on the strength of the deleptonization flux. For a realistic SN the quasi single-angle behavior is probably typical, simplifying the numerical treatment and probably allowing for the survival of observational features of flavor oscillations.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:48:08 GMT" } ]
2008-11-26T00:00:00
[ [ "Esteban-Pretel", "Andreu", "" ], [ "Pastor", "Sergio", "" ], [ "Tomas", "Ricard", "" ], [ "Raffelt", "Georg", "" ], [ "Sigl", "Gunter", "" ] ]
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712.2177
Matthew Morrow
Matthew Morrow
Fubini's theorem and non-linear change of variables over a two-dimensional local field
(First replacement) An error was found in the proof of lemma 3.13 and the lemma as stated was false; the paper was significantly rewritten. (Second replacement) Comments on ramification theory have been added; a more comprehensive version of this paper is now available as chapter 4 of the author's thesis (see reference in paper)
null
null
null
math.NT math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider non-linear changes of variables and Fubini's theorem for certain integrals over a two-dimensional local field. An interesting example is presented in which imperfectness of a finite characteristic local field causes Fubini's theorem to unexpectedly fail. The relationship to ramification theory is discussed.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 15:51:40 GMT" }, { "version": "v2", "created": "Thu, 8 May 2008 14:12:02 GMT" }, { "version": "v3", "created": "Sun, 10 Jan 2010 13:45:21 GMT" } ]
2010-01-10T00:00:00
[ [ "Morrow", "Matthew", "" ] ]
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712.2178
Andrew Frey
Robert H. Brandenberger, Andrew R. Frey, Larissa C. Lorenz
Entropy Fluctuations in Brane Inflation Models
28 pg + refs; v2. added refs, clarified initial value T_0, added comparison to refs [49,50]; v3. added discussion of backreaction, reduces effects of entropy modes; v4. added model w/o backreaction, to be published in IJMPA; v5. corrected LaTeX bug with citations
Int.J.Mod.Phys.A24:4327-4354,2009
10.1142/S0217751X09045509
null
hep-th astro-ph gr-qc hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the development of entropy fluctuations in brane inflation in a warped throat, including the brane-antibrane tachyon as the waterfall field. We find that there is a period at the end of inflation during which the entropy mode associated with the tachyon field increases exponentially. In turn, the induced entropy seeds a contribution to the curvature fluctuation on cosmological scales which grows rapidly and could exceed the primordial curvature perturbation. We identify parameter values for which in the absence of back-reaction the induced curvature fluctuations are larger than the primordial adiabatic ones. In the specific model we study, however, back-reaction limits the growth of the entropy fluctuations. We discuss situations in which back-reaction effects are less constraining. The lesson of our investigation is that the study of the development of entropy fluctuations at the end of the period of inflation can lead to constraints on models of brane inflation and suggests that the curvaton mechanism may contribute significantly to the spectrum of cosmological perturbations.
[ { "version": "v1", "created": "Thu, 13 Dec 2007 16:58:52 GMT" }, { "version": "v2", "created": "Sun, 6 Jan 2008 21:54:07 GMT" }, { "version": "v3", "created": "Wed, 19 Mar 2008 21:10:48 GMT" }, { "version": "v4", "created": "Tue, 28 Jul 2009 13:34:14 GMT" }, { "version": "v5", "created": "Fri, 24 Jun 2011 18:44:15 GMT" } ]
2011-06-27T00:00:00
[ [ "Brandenberger", "Robert H.", "" ], [ "Frey", "Andrew R.", "" ], [ "Lorenz", "Larissa C.", "" ] ]
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