Note on the Time Reversal Asymmetry of Equations of Motion

Details Note on the Time Reversal Asymmetry of Equations of Motion Note on the Time Reversal Asymmetry of Equations of Motion

1999-03-30

arxiv.org/abs/physics/9903046v2

Found.Phys.Lett. 12 (1999) 193-196

Physics

Classical Physics

Footnote regarding misprints in the published version added. 5 pages, latex

Scientific paper

Rohrlich's recent claim that the equation of motion for a point charge be symmetric under time reversal is shown to be the result of an unusual definition. The equation of motion for a charged sphere of finite size, which in contrast is claimed to be asymmetric because of the finite propagation time of its (retarded) self-forces, is shown to possess the same asymmetry (or the same symmetry, depending on the definition) as that for a point charge. Similar arguments apply to other effective equations of motion (such as those describing friction or decoherence).

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