Production of the Fisher information for the Landau-Coulomb equation with L1 initial data

Laurent Desvillettes, William Golding, Maria Pia Gualdani, Amelie Loher

Published 2024-10-14Version 1

We consider the Landau-Coulomb equation for initial data with bounded mass, finite numbers of moments, and entropy. We show the existence of a global weak solution that has bounded Fisher information for positive times. This solution is therefore a global strong solution away from the initial time. We propose an alternative approach, based on already existing estimates, to the study of the appearance of Fisher information recently performed by Ji in [12].