Precise Laplace asymptotics for singular stochastic PDEs: The case of 2D gPAM
Abstract
We implement a Laplace method for the renormalised solution to the generalised 2D Parabolic Anderson Model (gPAM) driven by a small spatial white noise. Our work rests upon Hairer's theory of regularity structures which allows to generalise classical ideas of Azencott and Ben Arous on path space as well as Aida and Inahama and Kawabi on rough path space to the space of models. The technical cornerstone of our argument is a Taylor expansion of the solution in the noise intensity parameter: We prove precise bounds for its terms and the remainder and use them to estimate asymptotically irrevelant terms to arbitrary order. While most of our arguments are not specific to gPAM, we also outline how to adapt those that are.
Keywords
Cite
@article{arxiv.2103.00028,
title = {Precise Laplace asymptotics for singular stochastic PDEs: The case of 2D gPAM},
author = {Peter K. Friz and Tom Klose},
journal= {arXiv preprint arXiv:2103.00028},
year = {2022}
}
Comments
To appear in Journal of Functional Analysis. In the accepted version, we omitted some of the proofs and only sketched some arguments, both to streamline the presentation. This arXiv article is the extended version of the accepted manuscript and provides all the left out details and complete proofs. 85 pages, 3 figures