Closing the window for massive photons [PDF]
Sergio A. Hojman, Benjamin KochWorking with the assumption of non-zero photon mass and a trajectory that is described by the relativistic world-line of a spinning top we find, by deriving new astrophysical bounds, that this assumption is in contradiction with todays experimental results. This yields the conclusion that the photon has to be exactly massless.View original: http://arxiv.org/abs/1209.4907
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