2000

Claude Bouchiat 1, Marc Mezard 1, 2, 3 European Physical Journal E (2000) 337-402 We study the elastic behaviour of a supercoiled DNA molecule. The simplest model is that of a rod like chain, involving two elastic constants, the bending and the twist rigidities. We show that this model is singular and needs a small distance cut-off, which is a natural […]

Jesper Lykke Jacobsen 1 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 62 (2000) R1-R4 We establish explicit duality transformations for systems of M q-state Potts models coupled through their local energy density, generalising known results for M=1,2,3. The M-dimensional space of coupling constants contains a selfdual sub-manifold of dimension D_M = [M/2]. For the case

Fedorov, A.V., Brazovskii S. et, al Journal of Physics : Condensed matter 12 (2000) L191-L198

Eugene Bogomolny 1, Nicolas Pavloff 1, Charles Schmit 1 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 61 (2000) 3689-3711 We derive contributions to the trace formula for the spectral density accounting for the role of diffractive orbits in two-dimensional polygonal billiards. In polygons, diffraction typically occurs at the boundary of a family of trajectories. In this case the first

P. Leboeuf 1, A. Monastra 1 Physical Review B 62 (2000) 12617-12620 The grand potential $\\Omega$ and the response $R = – \\partial \\Omega /\\partial x$ of a phase-coherent confined noninteracting electron gas depend sensitively on chemical potential $\\mu$ or external parameter $x$. We compute their autocorrelation as a function of $\\mu$, $x$ and temperature. The result is related

C. Monthus 1, T. Garel 1, H. Orland 1 European Physical Journal B 17 (2000) 121 We consider two different problems involving the localization of a single polymer chain: (i) a periodic $AB$ copolymer at a selective fluid-fluid interface, with the upper (resp. lower) fluid attracting $A$ (resp. $B$) monomers (ii) a homopolymer chain attracted to a hard wall (wetting). Self

S. Nechaev 1, 2, G. Oshanin 3, A. Blumen 4 Journal of Statistical Physics 98 (2000) 281-303 We study dynamics of a Rouse polymer chain, which diffuses in a three-dimensional space under the constraint that one of its ends, referred to as the slip-link, may move only along a one-dimensional line containing randomly placed, immobile, perfect traps. For such a model we

Xavier Campi 1, Hubert Krivine 1, Nicolas Sator 1, Eric Plagnol 2 European Physical Journal D 11 (2000) 233-238 We show that the size distributions of fragments created by high energy nuclear collisions are remarkably well reproduced within the framework of a parameter free percolation model. We discuss two possible scenarios to explain this agreement and suggest that percolation could be an universal

Eugene Bogomolny 1 Nonlinearity 13 (2000) 947-972 In many problems of quantum chaos the calculation of sums of products of periodic orbit contributions is required. A general method of computation of these sums is proposed for generic integrable models where the summation over periodic orbits is reduced to the summation over integer vectors uniquely associated with periodic

Jérôme Houdayer 1, Olivier C. Martin 1 Europhysics Letters (EPL) 49 (2000) 794-800 A controversial issue in spin glass theory is whether mean field correctly describes 3-dimensional spin glasses. If it does, how can replica symmetry breaking arise in terms of spin clusters in Euclidean space? Here we argue that there exist system-size low energy excitations that are sponge-like, generating