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VOLUME 78 (2003) | ISSUE 4 | PAGE 238
Drift Lagrangian for relativistic particle in intense laser field
PACS: 45.20.Jj, 52.20.Dq, 52.27.Ny, 52.35.Mw
Abstract
The Lagrangian and Hamiltonian functions describing average motion of a relativistic particle under the action of a slightly inhomogeneous intense laser field are obtained. In weak low-frequency background fields, such a particle on average drifts with an effective, relativistically invariant mass, which depends on the laser intensity. The essence of the proposed ponderomotive formulation is presented in a physically intuitive and mathematically simple form, yet represents a powerful tool for studying various nonlinear phenomena caused by interaction of currently available smooth ultra-intense laser pulses with plasmas.