A Presymplectic and Symmetry Reduced Formulation of the Maxwell Vlasov System

Abstract: We develop a unified geometric formulation of the Maxwell-Vlasov system using the infinite-dimensional Skinner-Rusk (SR) formalism. In this framework, particles and fields are treated simultaneously within a single presymplectic manifold, and the Gotay--Nester--Hinds algorithm recovers the full Maxwell-Vlasov equations as the compatibility conditions of a single variational system. The hierarchy of constraints -- including Vlasov advection, Gauss and Faraday laws, and the electromagnetic gauge structure -- arises naturally from the presymplectic geometry of the SR formalism. Reduction by the diffeomorphism group of phase space produces a reduced presymplectic manifold whose dynamics reproduces both the Euler--Poincare formulation for the Vlasov sector and the Marsden--Weinstein/Morrison--Greene Lie--Poisson Hamiltonian structure. We further extend the construction to equilibria that partially break the relabeling symmetry, obtaining a translated SR system that yields an effective symplectic linearization, clarifies the appearance of Goldstone-type neutral modes, and provides a geometric foundation for the energy--Casimir method. Finally, we incorporate external antenna fields into this setting by introducing affine Hamiltonian controls and establishing a theory of controlled symmetry breaking within the reduced SR framework. This leads to controlled Lie--Poisson equations for plasma--antenna coupling and a geometric mechanism for stabilization through Casimir shaping and symmetry-selective forcing. The resulting picture provides a single presymplectic structure that unifies Lagrangian, Hamiltonian, gauge, reduction, and control-theoretic aspects of the Maxwell-Vlasov system.