Propagation of $L^{1}$ and $L^{\infty}$ Maxwellian weighted bounds for derivatives of solutions to the homogeneous elastic Boltzmann Equation

TL;DR

This paper establishes sharp moment inequalities and demonstrates the propagation of $L^{1}$ and $L^{ty}$ Maxwellian weighted bounds for derivatives of solutions to the homogeneous elastic Boltzmann equation with variable hard potentials and angular cutoff.

Contribution

It extends the propagation of Maxwellian weighted estimates to all derivatives of solutions for a broad class of elastic Boltzmann equations with variable hard potentials.

Findings

Propagation of $L^1$-Maxwellian weighted estimates for all derivatives.

Propagation of $L^ty$-Maxwellian weighted estimates for solutions.

Extension of sharp moment inequalities to all derivatives and broader collision kernels.

Abstract

We consider the $n$-dimensional space homogeneous Boltzmann equation for elastic collisions for variable hard potentials with Grad (angular) cutoff. We prove sharp moment inequalities, the propagation of $L^1$-Maxwellian weighted estimates, and consequently, the propagation $L^\infty$-Maxwellian weighted estimates to all derivatives of the initial value problem associated to the afore mentioned problem. More specifically, we extend to all derivatives of the initial value problem associated to this class of Boltzmann equations corresponding sharp moment (Povzner) inequalities and time propagation of $L^1$-Maxwellian weighted estimates as originally developed A.V. Bobylev in the case of hard spheres in 3 dimensions; an improved sharp moments inequalities to a larger class of angular cross sections and $L^1$-exponential bounds in the case of stationary states to Boltzmann equations for inelastic interaction problems with `heating' sources, by A.V. Bobylev, I.M. Gamba and V.Panferov, where high energy tail decay rates depend on the inelasticity coefficient and the the type of `heating' source; and more recently, extended to variable hard potentials with angular cutoff by I.M. Gamba, V. Panferov and C. Villani in the elastic case collision case and so $L^1$-Maxwellian weighted estimated were shown to propagate if initial states have such property. In addition, we also extend to all derivatives the propagation of $L^\infty$-Maxwellian weighted estimates to solutions of the initial value problem to the Boltzmann equations for elastic collisions for variable hard potentials with Grad (angular) cutoff.