Lagrangian Formulation of Relativistic Particle Average Motion in a Laser Field of Arbitrary Intensity
Authors: I.Y. Dodin, N.J. Fisch, and G.M. Fraiman
Date of PPPL Report: February 2003
Submitted to: JETP Letters
The Lagrangian and Hamiltonian functions describing average motion of a relativistic particle under the action of intensive high-frequency electromagnetic radiation are obtained. In weak, low-frequency background fields, such a particle on average drifts with an effective, relativistically invariant mass, which depends on the intensity of the electromagnetic field.