Sunday, 11 June 2017

electromagnetism - How the inverse square law in electrodynamics is related to photon mass?


I have read somewhere that one of the tests of the inverse square law is to assume nonzero mass for photon and then, by finding a maximum limit for it , determine a maximum possible error in $\frac{1}{r^{2+\epsilon} }$ for $\epsilon$ . My question is: (in the context of classical physics)




  • How are these two related and what is the formula relating them?





  • Why measuring photon mass is easier than testing the inverse square law directly? (Indeed it seems more challenging!)






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