Nom de l’auteur/autrice :admin

Andreas Honecker 1, Jesper-Lykke Jacobsen 2, Marco Picco 3, Pierre Pujol 4 We study the universality class of the fixed points of the 2D random bond q-state Potts model by means of numerical transfer matrix methods. In particular, we determine the critical exponents associated with the fixed point on the Nishimori line. Precise measurements show that the universality class of this fixed point […]

Bogomolny, E., Gerland, U., Schmit, C. Physical Review E59 (1999) R1315-R1318

J. Houdayer 1, O. C. Martin 1 Physical Review Letters 82 (1999) 4934-4937 Ground states of the three dimensional Edwards-Anderson spin glass are computed in the presence of an external magnetic field. Our algorithm is sufficiently powerful for us to treat systems with up to 600 spins. We perform a statistical analysis of how the ground state changes as

Stephen C. Creagh 1, 2, Niall D. Whelan 2, 3 Physical Review Letters 82 (1999) 5237-5240 Tunnelling from a chaotic potential well is explained in terms of a set of complex periodic orbits which contain information about the real dynamics inside the well as well as the complex dynamics under the confining barrier. These orbits are associated with trajectories which are

Jean Desbois 1, Stephane Ouvry 1, Christophe Texier 1 European Physical Journal B 7 (1999) 527-528 The Hall conductivity of disordered magnetic systems consisting of hard-core point vortices randomly dropped on the plane with a Poissonian distribution, has a behavior analogous to the one observed experimentally by R.~J.~Haug, R.~R.~Gerhardts, K.~v.~Klitzling and K.~Ploog, with repulsive scatterers \\cite {1}. We also argue that

H. Alt 1, C. Dembowski 1, H. -D. Graef 1, R. Hofferbert 1, H. Rehfeld 1, A. Richter 1, 2, C. Schmit 3 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 60 (1999) 2851-2857 We compare the statistical properties of eigenvalue sequences for a gamma=1 Bunimovich stadium billiard. The eigenvalues have been obtained by two ways: one set results from a measurement of the eigenfrequencies of a superconducting microwave

Kirova, N., Brazovskii, S., Bishop, A.R., D., McBranch, V., Klimov. Synthetic Metals 101 (1999) 188-191

P. Di Francesco 1, Paul Zinn-Justin 2, J. -B. Zuber 2 We present determinant formulae for the number of tilings of various domains in relation with Alternating Sign Matrix and Fully Packed Loop enumeration. 1. Service de Physique Théorique (SPhT), CNRS : URA2306 – CEA : DSM/SPHT 2. Laboratoire de Physique Théorique et Hautes Energies (LPTHE), CNRS : UMR7589 – Université Paris VI – Pierre

G. R. Schreiber, O. C. Martin 1 SIAM Journal on Optimization 10 (1999) 231-251 We investigate the statistical properties of cut sizes generated by heuristic algorithms which solve approximately the graph bisection problem. On an ensemble of sparse random graphs, we find empirically that the distribution of the cut sizes found by « local\’\’ algorithms becomes peaked as the

Vladimir S. Dotsenko 1, Jesper Lykke Jacobsen 2, Marc-André Lewis 1, Marco Picco 1 Nuclear Physics B 546 (FS) (1999) 505 We consider q-state Potts models coupled by their energy operators. Restricting our study to self-dual couplings, numerical simulations demonstrate the existence of non-trivial fixed points for 2