Global Classical Solutions of the Relativistic Vlasov-Darwin System with Small Cauchy Data: the Generalized Variables Approach

TL;DR

This paper proves the global existence of classical solutions for the relativistic Vlasov-Darwin system with small initial data using a novel generalized variables approach, avoiding energy conservation estimates.

Contribution

It introduces a new method based on generalized space and momentum variables to establish global solutions without relying on energy conservation estimates.

Findings

Established global classical solutions for small initial data.

Provided improved decay estimates for electromagnetic fields.

Extended the functional space for initial data.

Abstract

We show that a smooth, small enough Cauchy datum launches a unique classical solution of the relativistic Vlasov-Darwin (RVD) system globally in time. A similar result is claimed in Comm. Math. Sci. 6, 749-764 (2008) following the work in Int. Mat. Res. Not. 57191, 1-31 (2006). Our proof does not require estimates derived from the conservation of the total energy, nor those previously given on the transverse component of the electric field. These estimates are crucial in the references cited above. Instead, we exploit the formulation of the RVD system in terms of the generalized space and momentum variables. By doing so, we produce a simple a-priori estimate on the transverse component of the electric field. We widen the functional space required for the Cauchy datum to extend the solution globally in time, and we improve decay estimates given in Comm. Math. Sci. 6, 749-764 (2008) on the electromagnetic field and its space derivatives. Our method extends the constructive proof presented in "Collisionless kinetic equations from astrophysics: The Vlasov-Poisson system. Handbook of Differential Equations: Evolutionary Equations, Vol.3, Elsevier, 2007" to solve the Cauchy problem for the Vlasov-Poisson system with a small initial datum.