Cherenkov radiation in a photon gas

Details Cherenkov radiation in a photon gas Cherenkov radiation in a photon gas

2005-02-09

arxiv.org/abs/hep-ph/0502092v1

NewJ.Phys.7:70,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, to appear in New J. Phys

Scientific paper

10.1088/1367-2630/7/1/070

It is well-known that a charged particle moving with constant velocity in vacuum does not radiate. In a medium the situation can be different. If the so called Cherenkov condition is satisfied, i.e. the particle velocity exceeds the phase speed in the medium, the particle will radiate. We show that a charge moving with a constant velocity in a gas of photons emits Cherenkov radiation, even in the gamma-ray regime, due to nonlinear quantum electrodynamic effects. Our result is evaluated with respect to the radiation background in the early universe, and it is argued that the effect can be significant.

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