prase comments on Particles break light-speed limit? - Less Wrong

9 Post author: Kevin 23 September 2011 11:00AM

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Comment author: prase 23 September 2011 05:22:32PM 2 points [-]

The experimental upper bound on photon mass is 10^-18 eV. The photons near visible spectrum have about 10^-3 eV, which means their relative deviation from c is of order 10^-30. Gamma would be even closer. I don't think mass of photon is measurable via speed of light.