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This phenomenon has practical applications as in particle detectors etc.

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For particles to go faster than the speed of light requires that Lorentz invariance must be broken. It is possible to formulate theories that violate Lorentz invariance, and such theories do indeed predict that particles going faster than the speed of light will emit radiation and lose energy as a result. This effect was invoked by Andrew Cohen and Sheldon Glashow in this article to show that the results of the OPERA experiments that appeared to show that neutrinos had been observed travelling faster than light, could not be correct. The energy distribution of the neutrino beam at the detection point would have had to be affected by this energy loss but this was not observed.

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