A Local limit theorem for directed polymers in random media: the continuous and the discrete case

Details A Local limit theorem for directed polymers in random media: the continuous and the discrete case A Local limit theorem for directed polymers in random media: the continuous and the discrete case

2005-03-25

arxiv.org/abs/math/0503596v1

Mathematics

Probability

Scientific paper

In this article, we consider two models of directed polymers in random environment: a discrete model and a continuous model. We consider these models in dimension greater or equal to 3 and we suppose that the normalized partition function is bounded in L^2. Under these assumptions, Sinai proved a local limit theorem for the discrete model, using a perturbation expansion. In this article, we give a new method for proving Sinai's local limit theorem. This new method can be transposed to the continuous setting in which we prove a similar local limit theorem.

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