$\alpha$-Navier-Stokes equation perturbed by space-time noise of trace class

TL;DR

This paper studies a stochastic version of the $ ext{alpha}$-Navier-Stokes equations with space-time noise, proving existence, uniqueness, and ergodic properties of solutions under trace class noise conditions.

Contribution

It establishes the existence, uniqueness, and ergodic behavior of solutions for the stochastic $ ext{alpha}$-Navier-Stokes equations with trace class noise, extending deterministic results to stochastic settings.

Findings

Proved existence and uniqueness of strong solutions.

Established exponential moment bounds for solutions.

Demonstrated the strong Feller property and irreducibility.

Abstract

We consider a stochastic perturbation of the $\alpha$-Navier-Stokes model. The stochastic perturbation is an additive space-time noise of trace class. Under a natural condition about the trace of operator $Q$ in front of the noise, we prove the existence and uniqueness of strong solution, continuous in time in classical spaces of $L^{2}$ functions with estimates of non-linear terms. It is based on a priori estimate of solutions of finite-dimensional systems, and tightness of the approximated solution. Moreover, by studying the derivative of the solution with respect to the initial data, we can prove exponential moment of the approximated solutions, which is enough to obtain Strong Feller property and irreducibility of the transition semigroup. This leads naturally to the existence and uniqueness of an invariant measure.