Statistics of shocks in a toy model with heavy tails.
We study the energy minimization for a particle in a quadratic well in the presence of short-ranged heavy-tailed disorder, as a toy model for an elastic manifold. The discrete model is shown to be described in the scaling limit by a continuum Poisson process model which captures the three universality classes. This model is solved in general, and we give, in the present case (Frechet class), detailed results for the distribution of the minimum energy and position, and the distribution of the sizes of the shocks (i.e., switches in the ground state) which arise as the position of the well is varied. All these distributions are found to exhibit heavy tails with modified exponents. These results lead to an "exotic regime" in Burgers turbulence decaying from a heavy-tailed initial condition.
CNRS-Laboratoire de Physique Théorique de l'Ecole Normale Supérieure 24 rue Lhomond, 75005 Paris, France.
Thomas
T
Gueudré
CNRS-Laboratoire de Physique Théorique de l'Ecole Normale Supérieure 24 rue Lhomond, 75005 Paris, France.
Pierre
P
Le Doussal