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Physics and Astronomy (1)

relativistic magneto-hydrodynamics

Laser and Particle Beams (1)

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General foundation for the nonlinear ponderomotive four-force in laser-plasma interactions
T.P. ROWLANDS
Journal:

Laser and Particle Beams / Volume 24 / Issue 4 / October 2006

Published online by Cambridge University Press:

28 November 2006, pp. 475-493
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The interaction of electromagnetic radiation with plasmas is studied in relativistic four-vector formalism. A gauge and Lorentz invariant ponderomotive four-force is derived from the time dependent nonlinear three-force of Hora (1985). This four-force, due to its Lorentz invariance, contains new magnetic field terms. A new gauge and Lorentz invariant model of the response of plasma to electromagnetic radiation is then devised. An expression for the dispersion relation is obtained from this model. It is then proved that the magnetic permeability of plasma is unity for a general reference frame. This is an important result since it has been previously assumed in many plasma models.