On the Keller-Segel models interacting with a stochastically forced incompressible viscous flow in $\mathbb{R}^2$

TL;DR

This paper establishes the existence and uniqueness of global solutions for a stochastic Keller-Segel model coupled with Navier-Stokes equations in 2D, advancing understanding of chemotaxis in stochastic fluid environments.

Contribution

It introduces a novel regularized approximation scheme for the stochastic Keller-Segel-Navier-Stokes system and proves existence and uniqueness of solutions using stochastic analysis techniques.

Findings

Existence of global martingale weak solutions under certain conditions.

Pathwise uniqueness when chemotactic sensitivity is constant.

Development of new stochastic entropy-energy inequalities.

Abstract

This paper considers the Keller-Segel model coupled to stochastic Navier-Stokes equations (KS-SNS, for short), which describes the dynamics of oxygen and bacteria densities evolving within a stochastically forced 2D incompressible viscous flow. Our main goal is to investigate the existence and uniqueness of global solutions (strong in the probabilistic sense and weak in the PDE sense) to the KS-SNS system. A novel approximate KS-SNS system with proper regularization and cut-off operators in $H^s(\mathbb{R}^2)$ is introduced, and the existence of approximate solution is proved by some a priori uniform bounds and a careful analysis on the approximation scheme. Under appropriate assumptions, two types of stochastic entropy-energy inequalities that seem to be new in their forms are derived, which together with the Prohorov theorem and Jakubowski-Skorokhod theorem enables us to show that the sequence of approximate solutions converges to a global martingale weak solution. In addition, when $\chi(\cdot)\equiv \textrm{const.}>0$, we prove that the solution is pathwise unique, and hence by the Yamada-Wantanabe theorem that the KS-SNS system admits a unique global pathwise weak solution.