The large amplitude solution of the Boltzmann equation with soft potential

Abstract

In this paper, we deal with the (angular cut-off) Boltzmann equation with soft potential (-3 < gamma < 0). In particular, we construct a unique global solution in L-x,v(infinity) which converges to global equilibrium asymptot-ically provided that initial data has a large amplitude but with sufficiently small relative entropy. Because frequency multiplier is not uniformly positive anymore, unlike hard potential case, time-involved veloc-ity weight will be used to derive sub-exponential decay of the solution. Motivated by recent development of L-2-L-infinity approach also, we introduce some modified estimates of quadratic nonlinear terms. Linearized collision kernel will be treated in a subtle manner to control singularity of soft potential kernel. (C) 2021 Elsevier Inc. All rights reserved.