i was wondering if anyone could give an explicit calculation or show a link that shows the proof to Furry's theorem. showing how the vacuum expectation value of any odd number of electromagnetic currents vanishes. in particular the case for $n=3$.

  • $\begingroup$ Wait, are you after the n=3 or the n=1 case? $\endgroup$ – Michael Oct 1 '13 at 13:54
  • $\begingroup$ i was after the photon one loop n=3 case. $\endgroup$ – alejandro123 Oct 1 '13 at 14:24
  • $\begingroup$ Did you just try to copy the question from here, almost word for word?? physics.stackexchange.com/q/54812 $\endgroup$ – nervxxx Oct 1 '13 at 21:31
  • 2
    $\begingroup$ @alejandro123 : See a short proof here in .pdf format. It is the first result in google. $\endgroup$ – Flint72 May 23 '14 at 19:46
  • $\begingroup$ I was looking for an actual proof carrying out the calculation of the integral from Feynman's diagram. $\endgroup$ – alejandro123 May 26 '14 at 10:51

This comes from the fact that the electromagnetic current changes sign under charge conjugation i.e $Cj^{\mu\nu}C^{\dagger} = -j^{\mu\nu}$ and thus the vaccum expectation of all diagrams withodd number of em legs vanishes


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.