Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2002-05-16
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
The previous version contained all the referees' reports, verbatim. This version deletes them at the arXiv's request. The prev
Scientific paper
We study the behavior in the remote past and future of solutions of an equation of motion for charged particles proposed by F. Rohrlich, for the special case in which the motion is in one spatial dimension. We show that if an external force is applied for a finite time, some solutions exhibit the property of ``preacceleration'', meaning that the particle accelerates before the force is applied, but that there do exist solutions without preacceleration. However, most solutions without preacceleration exhibit ``postacceleration'' into the infinite future (i.e., the particle accelerates after the force is removed). Some may consider such behavior as sufficiently "unphysical" to rule out the equation. More encouragingly, we show that analogs of the unphysical ``runaway'' solutions of the Lorentz-Dirac equation do not occur for solutions of Rohrlich's equation. We show that when the external force eventually vanishes, the proper acceleration vanishes asymptotically in the future, and the coordinate velocity becomes asymptotically constant.
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