Speed of a photon relative to another photon

  • #26
tiny-tim
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ooh yes! …

"[URL [Broken] :biggrin:
 
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  • #27
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It took me a while to find it. I refer to page no. 98 in Feynman’s “QED the strange theory of light and matter”, the 2006 edition:

“It may surprise you that there is an amplitude for the photon to go at speeds faster or slower than the conventional speed, c. The amplitudes for these possibilities are very small compared to the contribution from speed c; in fact they cancel out when light travels over long distances. However, when the distances are short – as in many of the diagrams I will be drawing – these other possibilities become vitally important and must be considered.”

Feynman’s QED lectures (4 x 1 hour) are very interesting and entertaining to watch and listen to:

http://vega.org.uk/video/subseries/8
 

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