Global Well-posedness and Asymptotic Extinction for Keller-Segel Systems with Superlinear Noise

Source abstract

It is well known that solutions to deterministic Keller--Segel chemotaxis systems can blow up in finite time under certain conditions. To investigate whether noise can prevent such blow-up, we study parabolic--elliptic and fully parabolic Keller--Segel systems on smooth bounded domains with pointwise superlinear multiplicative Itô noise $σ_0u^r\,\mathrm dW_t$, where $W$ is a real Brownian motion. Our results show that superlinear multiplicative noise can prevent finite-time blow-up in Keller--Segel systems. For $r>3/2$, we prove global existence and pathwise uniqueness of nonnegative mild solutions in arbitrary spatial dimension, for every $σ_0>0$. At $r=3/2$, both systems are globally well-posed in two dimensions for every positive noise intensity; in arbitrary dimension, the parabolic--elliptic system is global under $σ_0^2\ge2χ$. For $r>3/2$ in the fully parabolic case, the proof combines a logarithmic estimate for the time derivative of the chemical signal with comparison of the local solution to the solution of a scalar stochastic differential equation. The two-dimensional case follows from mass quadratic variation, deterministic maximal regularity, and localized energy estimates. We also establish almost-sure $L^1$ extinction and algebraic decay of fractional mass moments.