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arXiv · 1905.11310

Moments of the 2D SHE at criticality

Yu Gu·Jeremy Quastel·Li-Cheng Tsai
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Abstract

We study the stochastic heat equation in two spatial dimensions with a multiplicative white noise, as the limit of the equation driven by a noise that is mollified in space and white in time. As the mollification radius $ \varepsilon\to 0 $, we tune the coupling constant near the critical point, and show that the single time correlation functions converge to a limit written in terms of an explicit non-trivial semigroup. Our approach consists of two steps. First we show the convergence of the resolvent of the (tuned) two-dimensional delta Bose gas, by adapting the framework of Dimock and Rajeev (2004) to our setup of spatial mollification. Then we match this to the Laplace transform of our semigroup.

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Yu Gu, Jeremy Quastel, Li-Cheng Tsai. 2019-05-27. Moments of the 2D SHE at criticality. https://doi.org/10.2140/pmp.2021.2.179

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