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A modified Hamilton–Jacobi formalism is introduced as a tool to obtain the energy‐momentum and angular‐momentum tensors for any kind of nonlinear or linearized Maxwell‐collisionless kinetic theories. The emphasis is on linearized theories, for which these tensors are derived for the first time. The kinetic theories treated—which need not be the same for all particle species in a plasma—are the Vlasov and kinetic guiding center theories. The Hamiltonian for the guiding center motion is taken in the form resulting from Dirac’s constraint theory for nonstandard Lagrangian systems. As an example of the Maxwell‐kinetic guiding center theory, the second‐order energy for a perturbed homogeneous magnetized plasma is calculated with initially vanishing field perturbations. The expression obtained is compared with the corresponding one of Maxwell–Vlasov theory.

The energy-momentum tensor for the linearized Maxwell–Vlasov and kinetic guiding center theories