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

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 [15] following the work in [13]. 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 [15] on the electromagnetic field and its space derivatives. Our method extends the constructive proof presented in [14] to solve the Cauchy problem for the Vlasov-Poisson system with a small initial datum.