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math.AP2026

Mean field games with Hormander diffusions

Yiming Jiang, Jingchuang Ren, Yawei Wei +1

In this paper, we study a class of degenerate mean field games (MFG, for short) systems with Hormander diffusion, in which the typical agent can move only along admissible directio…

math.AP2026

Stochastic Two-Species Chemotaxis Competition: Global Well Posedness and Continuous Dependence

Yiming Jiang, Haohang Li, Yawei Wei

In this paper, we investigate a stochastic two species competition Keller--Segel model. Chemotactic movement, interspecific competition, and environmental fluctuations may act simu…

math.AP2026

Stochastic Keller Segel System with Porous Medium Diffusion and Nonlinear Chemotactic Sensitivity

Yiming Jiang, Haohang Li, Yawei Wei

In this paper, we investigate a stochastic Keller--Segel system with porous medium diffusion and nonlinear chemotactic sensitivity on a bounded one-dimensional domain. The model de…

math.AP2026

Well-posedness of the mean field game master equation on Carnot tori

Yiming Jiang, Yawei Wei, Yiyun Yang

We study the master equation for a second-order mean field game on Carnot tori, which means the generic player can move periodically only along admissible trajectories given by the…

math.AP2026

Regularity results for linear parabolic equations on Carnot tori via mollifier kernel construction

Yiming Jiang, Yawei Wei, Yiyun Yang

This paper first proves the existence, uniqueness and regularity of the solution to a class of linear backward parabolic equations on Carnot tori, namely the periodic linear parabo…