Phys. Rev. Lett. 98, 041603 (2007) [4 pages]Vacuum Čerenkov Radiation in Lorentz-Violating Theories Without CPT ViolationReceived 6 September 2006; published 22 January 2007 In theories with broken Lorentz symmetry, Čerenkov radiation may be possible even in vacuum. We analyze the Čerenkov emissions that are associated with the least constrained Lorentz-violating modifications of the photon sector, calculating the threshold energy, the frequency spectrum, and the shape of the Mach cone. In order to obtain sensible results for the total power emitted, we must make use of information contained within the theory which indicates at what scale new physics must enter. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.041603
DOI:
10.1103/PhysRevLett.98.041603
PACS:
11.30.Cp, 41.60.Bq, 98.70.Sa
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