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arXiv · 2504.21791

Martingale problem of the two-dimensional stochastic heat equation at criticality

Yu-Ting Chen
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Abstract

We study the martingale formulation of the two-dimensional stochastic heat equation (SHE) at criticality. The main theorem proves an exact recursive-type equation that expresses the covariation measures of the SHE in terms of the solutions via an integro-multiplication operator. As an application, the quadratic variations of the martingale parts in the mild form are proven explicitly expressible in the solutions of the SHE and the two-dimensional two-body delta-Bose gas semigroups. The proofs are based on the standard approximations of the two-dimensional SHE at criticality, and now we analyze asymptotic expansions of the covariation measures of the approximate solutions in the limit. Also, new bounds for certain mixed moments of the fourth order of the approximate solutions are among the main tools for a priori estimates.

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Yu-Ting Chen. 2025-04-30. Martingale problem of the two-dimensional stochastic heat equation at criticality. https://arxiv.org/abs/2504.21791

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