English

The continuum directed polymer in L\'evy Noise

Probability 2021-11-17 v3

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 α\alpha-stable noises with α(1,2)\alpha \in (1,2). 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

R2 v1 2026-06-23T17:04:54.202Z