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?

  • $\begingroup$ canyou give the page number as the online pdf's are images $\endgroup$ – anna v Jan 23 at 14:49
  • $\begingroup$ Pages 89-90 ibb.co/WPvB16L ibb.co/xsHwsfp $\endgroup$ – Arman Armenpress Jan 23 at 14:57
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    $\begingroup$ Thanks. Feynman always was sui generis., (the two times I heard him lecture (1964 and 1981)). I will be interested in the answers, $\endgroup$ – anna v Jan 23 at 15:47
  • $\begingroup$ physics.stackexchange.com/questions/10967/… this question and answers may help $\endgroup$ – Joshua Lin Jan 24 at 2:48
  • $\begingroup$ @Joshua Lin Thanks, but there I did not find the answer ( $\endgroup$ – Arman Armenpress Jan 24 at 8:10

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