Positive speed of propagation in a semilinear parabolic interface model with unbounded random coefficients

Details Positive speed of propagation in a semilinear parabolic interface model with unbounded random coefficients Positive speed of propagation in a semilinear parabolic interface model with unbounded random coefficients

2011-02-28

arxiv.org/abs/1102.5691v1

Mathematics

Probability

17 pages

Scientific paper

We consider a model for the propagation of a driven interface through a random field of obstacles. The evolution equation, commonly referred to as the Quenched Edwards-Wilkinson model, is a semilinear parabolic equation with a constant driving term and random nonlinearity to model the influence of the obstacle field. For the case of isolated obstacles centered on lattice points and admitting a random strength with exponential tails, we show that the interface propagates with a finite velocity for sufficiently large driving force. The proof consists of a discretization of the evolution equation and a supermartingale estimate akin to the study of branching random walks.

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