My dear Dan! You've managed to surprise me!! Surely you don't mean that you don't mean that you don't know what the term proper mass is? If that's the case then it's merely a synonym for the term proper mass. I use the term proper mass because the term "rest mass" has no meaning for particles which don't have a rest frame. It's what you'd call the "mass of the photon," i.e. mg where g = the greek letter gammatopsquark said:What does "proper mass of the photon" mean?
The Proca Lagrangian is defined as (this is from Jackson's EM text, 3rd Ed.)
. Just click on the Attached Thumbnail.
That's incorrect. You have the wrong idea of what a photon is. A photon is the quanta of the EM field. Currently it is hypothesized that it's proper mass is zero. However, if experiments show that it's proper mass is not actually zero then that doesn't mean that it's not a photon. It just means that the hypothesis that the proper mass of the photon is zero is wrong.topsquark said:If we like we can solve the Proca equation with a massive particle, but it won't act like a photon because it isn't a photon. One of the immediate consequences is that the massive "photon" can't travel at c.
Please download Classical Electrodynamics - Third Edition by John David Jackson (1999) at: http://bookos-z1.org/book/655173/890650
and turn to the section 1.2 starting on page 5 entitled Inverse Square Law or Mass of Photon. In particular see page 7 which reads
See also the mass of a photon? by Don Koks (very smart and very kind man)John David Jackson said:The surface measurements of the Earth's magnetic field give slightly the best value (...), namely,
mg < 4x10-51
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