Global solutions for the stochastic reaction-diffusion equation with super-linear multiplicative noise and strong dissipativity

Abstract

A condition is identified that implies that solutions to the stochastic reaction-diffusion equation $\frac{\partial u}{\partial t}=\mathcal{A}u+f(u)+\mathit{\sigma }(u)\dot{W}$ on a bounded spatial domain never explode. We consider the case where σ grows polynomially and f is polynomially dissipative, meaning that f strongly forces solutions toward finite values. This result demonstrates the role that the deterministic forcing term f plays in preventing explosion.