Cerenkov radiation by charged particles in an external gravitational eld
نویسندگان
چکیده
Charged particles in the geodesic trajectory of an external gravitational eld do not emit electromagnetic radiation. This is expected from the application of the equivalence principle. We show here that charged particles propagating in an external gravitational eld with non-zero components of the Ricci tensor can emit radiation by the Cerenkov process. The external gravitational eld acts like an e ective refractive index for light. Since the Ricci tensor cannot be eliminated by a change of coordinates, there is no violation of the equivalence principle in this process. E-mail:[email protected] E-mail:[email protected] E-mail:[email protected] PRL-TH-95/12 July 1995 astro-ph/9509022
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