Does a photon have an amplitude of motion at a speed less than the speed of light?

Asked Jan 23 '21 at 10:20

Active Jan 23 '21 at 10:20

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In the book QED: The Strange Theory of Light and Matter, Richard Feynman writes that for a photon there are nonzero amplitudes of motion with a speed that is greater or less than the speed of light. However, at great distances they are so small that they can be neglected.

Amplitude of motion with a speed less than the speed of light corresponds to the components of the photon propagator, which correspond to massive virtual pairs?

asked Jan 23 '21 at 10:20

Arman Armenpress

canyou give the page number as the online pdf's are images – anna v Jan 23 '21 at 14:49
Pages 89-90 https://ibb.co/WPvB16L https://ibb.co/xsHwsfp – Arman Armenpress Jan 23 '21 at 14:57
1

Thanks. Feynman always was sui generis., (the two times I heard him lecture (1964 and 1981)). I will be interested in the answers, – anna v Jan 23 '21 at 15:47
https://physics.stackexchange.com/questions/10967/how-is-the-path-integral-for-light-explained-or-how-does-it-arise this question and answers may help – QCD_IS_GOOD Jan 24 '21 at 02:48
@Joshua Lin Thanks, but there I did not find the answer ( – Arman Armenpress Jan 24 '21 at 08:10
Possible duplicates: https://physics.stackexchange.com/q/178938, https://physics.stackexchange.com/q/571421, – Nihar Karve Feb 08 '21 at 03:57

Does a photon have an amplitude of motion at a speed less than the speed of light?

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