The continuum directed polymer in L\'evy Noise

Quentin Berger; Hubert Lacoin

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arXiv · 2007.06484

The continuum directed polymer in L\'evy Noise

Quentin Berger·Hubert Lacoin

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

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Quentin Berger, Hubert Lacoin. 2020-07-13. The continuum directed polymer in L\'evy Noise. https://arxiv.org/abs/2007.06484

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