The exact Darwin Lagrangian

Details The exact Darwin Lagrangian The exact Darwin Lagrangian

2007-01-29

arxiv.org/abs/physics/0701324v3

EPL 79 (2007) 60002

Physics

Plasma Physics

2.5 pages, no figures

Scientific paper

10.1209/0295-5075/79/60002

Darwin (1920) noted that when radiation can be neglected it should be possible to eliminate the radiation degrees-of-freedom from the action of classical electrodynamics and keep the discrete particle degrees-of-freedom only. Darwin derived his well known Lagrangian by series expansion in $v/c$ keeping terms up to order $(v/c)^2$. Since radiation is due to acceleration the assumption of low speed should not be necessary. A Lagrangian is suggested that neglects radiation without assuming low speed. It cures deficiencies of the Darwin Lagrangian in the ultra-relativistic regime.

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