In this paper we study singular kinetic equations on \mathbb{R}^{2d} by the paracontrolled distribution method introduced in Gubinelli, Imkeller and Perkowski (Forum Math. Pi \mathbf{3} (2015) e6–75). We first develop paracontrolled calculus in the kinetic setting and use it to establish the global well-posedness for the linear singular kinetic equations under the assumptions that the products of singular terms are well defined. We also demonstrate how the required products can be defined in the case that singular term is a Gaussian random field by probabilistic calculation. Interestingly, although the terms in the zeroth Wiener chaos of regularization approximation are not zero, they converge in suitable weighted Besov spaces, and no renormalization is required. As applications the global well-posedness for a nonlinear kinetic equation with singular coefficients is obtained by the entropy method. Moreover, we also solve the martingale problem for nonlinear kinetic distribution dependent stochastic differential equations with singular drifts.

Publication:

The Annals of Probability (Volume: 52, Issue: 2, March 2024)

https://doi.org/10.1214/23-AOP1666

Author:

Zimo Hao

Fakultät für Mathematik, Universität Bielefeld

Xicheng Zhang

Department of Mathematics, Beijing Institute of Technology

Rongchan Zhu

Department of Mathematics, Beijing Institute of Technology

Xiangchan Zhu

Academy of Mathematics and Systems Science, Chinese Academy of Sciences

Email: zhuxiangchan@amss.ac.cn