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M. Mézard 1, M. Tarzia 1 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 76 (2007) 041124 We introduce and study a new optimization problem called Hyper Vertex Cover. This problem is a generalization of the standard vertex cover to hypergraphs: one seeks a configuration of particles with minimal density such that every hyperedge of the hypergraph contains […]

R. Nath 1, P. Pedri 2, L. M.N.B.F. Santos 1 Physical Review A: Atomic, Molecular and Optical Physics 76 (2007) 013606 We analyze the scattering of bright solitons in dipolar Bose-Einstein condensates placed in unconnected layers. Whereas for short-range interactions unconnected layers are independent, a remarkable consequence of the dipole interaction is the appearance of novel nonlocal interlayer effects. In particular, we

E. Bogomolny 1, R. Dubertrand 1, C. Schmit 1 Journal of Physics A: Mathematical and General 40 (2007) 381-395 The nodal lines of random wave functions are investigated. We demonstrate numerically that they are well approximated by the so-called SLE_6 curves which describe the continuum limit of the percolation cluster boundaries. This result gives an additional support to the recent conjecture

Wolfrom, C., Martin, O.C., Laurent, M., Deschatrette, J. FEBS Letters581 (2007) 125-130

Sanjay Kumar 1, Iwan Jensen 2, Jesper L. Jacobsen 3, Anthony J. Guttmann 2 Physical Review Letters 98 (2007) 128101 A statistical mechanical description of flexible and semi-flexible polymer chains in a poor solvent is developed in the constant force and constant distance ensembles. We predict the existence of many intermediate states at low temperatures stabilized by the force. A unified response to

Ciliberti, S., Martin, O.C., Wagner, A. PLOS Computational Biology (2007) 3 (2) : e15

Stefano Ciliberti 1, 2, Marc Mezard 1 European Physical Journal B 57, 2 (2007) 175-180 We use a replica approach to deal with portfolio optimization problems. A given risk measure is minimized using empirical estimates of asset values correlations. We study the phase transition which happens when the time series is too short with respect to the size of the

Bogomolny, E. Progress of Theoretical Physics Supplement 166 (2007) 19-36

Ying Jiang 1, Thorsten Emig 2 Physical Review B 75 (2007) 134413 We reassess the relation between classical lattice dimer models and the continuum elastic description of a lattice of fluctuating polymers. In the absence of randomness we determine the density and line tension of the polymers in terms of the bond weights of hard-core dimers on the square

Bogomolny, E., Schmit, C. Journal of Physics A40 (2007) 14033-14043