| Περίληψη: |
A nonlinear Vlasov–Fokker–Planck equation is considered in a bounded domain, with specular reflection imposed on the boundary. It is proven that if the initial datum is sufficiently close, in a weighted L∞-space, to a radial and spatially homogeneous function that is regular enough, then a corresponding global-in-time weak solution exists, and this one decays with exponential rate to the global Maxwellian. The proof is split into two steps. In the first, the stability of the manifold of spatially homogeneous solutions to this equation is established. In the second part, the close-to-Maxwellian regime is considered. A careful regularization scheme is designed so that this mollified equation can be well-approximated by a linear system. Inspired by the recent preprint [K. Carrapatoso and S. Mischler, The Landau equation in a domain, preprint (2024), arXiv:2407.09031], for this linear system, L2-hypocoercivity along with ultracontractivity properties are derived in order to change the space of functional decay to the L∞-framework. The properties of the original model are then recovered by means of fixed point arguments and carefully passing to the limit of the regularization parameter. [ABSTRACT FROM AUTHOR] |