Is the Lorentz limiting speed equal to the Speed of Light? Photons vs Neutrino tests
Abstract
We discuss the possibility that the limiting speed (cl) appearing in Lorentz equations might be different i.e., slightly larger than the observed speed of light (cn). We show that such a possibility can be tested by state-of-the-art Michelson-Morley experiments, but also by careful measurement of neutrino speeds. It would indeed suffice to show that cn < cneutrinos <= cl. Quite interestingly, current limits from both approaches are competitive, in some circumstances. We also comment on competing tests using gamma-ray burst, assuming a dispersive character for the propagation of light.
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