LOCAL EXISTENCE WITH MILD REGULARITY FOR THE BOLTZMANN EQUATION

International audienceWithout Grad's angular cuto assumption, the local existence of classical solutions to the Boltzmann equation is studied. There are two newimprovements: the index of Sobolev spaces for the solution is related to the parameter of the angular singularity; moreover, we do not assume that theinitial data is close to a global equilibrium. Using the energy method, one important step in the analysis is the study of fractional derivatives of thecollision operator and related commutators