Cutoff ergodicity bounds in Wasserstein distance for a viscous energy shell model with Lévy noise

Abstract: This article establishes explicit non-asymptotic ergodic bounds in the renormalized Wasserstein-Kantorovich-Rubinstein (WKR) distance for a viscous energy shell lattice model of turbulence with random energy injection. The system under consideration is driven either by a Brownian motion, a symmetric $\alpha$-stable L\'evy process, a stationary Gaussian or $\alpha$-stable Ornstein-Uhlenbeck process, or by a general L\'evy process with second moments. The obtained non-asymptotic bounds establish asymptotically abrupt thermalization. The analysis is based on the explicit representation of the solution of the system in terms of convolutions of Bessel functions.