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arXiv · 2607.24128

Global Existence and Pathwise Uniqueness for a Stochastic Parabolic-Parabolic Keller-Segel System

Jinhuan Wang·Qian Li·Hui Huang
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Abstract

In this paper, we study a stochastic parabolic-parabolic Keller-Segel system driven by nonlocal, nonlinear multiplicative noise in a two-dimensional bounded domain. Under suitable assumptions, we establish global existence and pathwise uniqueness of a strong solution for arbitrary initial data, without imposing any smallness conditions. This sharply contrasts with the deterministic two-dimensional Keller-Segel system, which typically requires smallness assumptions on initial mass. The main analytical challenges stem from the fully parabolic coupling, combined with a lack of coercivity and global Lipschitz continuity in both the chemotactic drift and noise terms. To overcome this, we introduce a tailored truncated system to establish local existence via Banach's fixed point theorem. Using this local existence and pathwise uniqueness, we construct a maximal local strong solution. Finally, by introducing a specialized Lyapunov functional, we derive uniform estimates to extend this solution globally.

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Jinhuan Wang, Qian Li, Hui Huang. 2026-07-27. Global Existence and Pathwise Uniqueness for a Stochastic Parabolic-Parabolic Keller-Segel System. https://arxiv.org/abs/2607.24128

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