The continuum directed polymer in L\'evy Noise
Abstract
We present in this paper the construction of a continuum directed polymer model in an environment given by space-time L\'evy noise. One of the main objectives of this construction is to describe the scaling limit of discrete directed polymer in an heavy-tail environment and for this reason we put special emphasis on the case of -stable noises with . Our construction can be performed in arbitrary dimension, provided that the L\'evy measure satisfies specific (and dimension dependent) conditions. We also discuss a few basic properties of the continuum polymer and the relation between this model and the Stochastic Heat Equation with multiplicative L\'evy noise.
Keywords
Cite
@article{arxiv.2007.06484,
title = {The continuum directed polymer in L\'evy Noise},
author = {Quentin Berger and Hubert Lacoin},
journal= {arXiv preprint arXiv:2007.06484},
year = {2021}
}
Comments
60 pages, some typos corrected. In the last version, an appendix on the convergence of truncated L\'evy noises has been added, together with other various comments