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turin
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This is only correct from an interpretive QFT standpoint, but not if you consider photons as classical particles that follow a single, definite trajectory. I have personally done experiments that demonstrate a nonzero time of flight for light. Also, the design of the particle detectors used in the LHC (e.g. CMS) would not work (i.e. would not give meaningful results) if photons (and any other ultrarelativistic particles) had zero time of flight, because the readout of the detector excitationis based on a very accurate timing between the proton bunch collision and the different radii of the detector materials.Naty1 said:If you think of one dimension of space as horizontal,x, and time as vertical, in the y direction, then massless photons move horizontally, ...
To put it in your terms, photons move diagonally with a slope of dy/dx=1/c; dy/dx=0 has been ruled out by countless experiments.