The generalized Boltzmann equation solution and exponential trend to equilibrium

Abstract
In the paper we consider a kinetic model that can be considered as a generalization of the Boltzmann equation. The model is formally derived from the BBGKY hierarchy for hard spheres system by introducing a variable diameter r in the domain [0, R] and then, by averaging the two-particle distribution function over this domain. For this model we prove global existence, uniqueness, and exponential convergence to equilibrium.