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When a particle transfers momentum to another particle so thatWhat is a photon? What is an elementary particle? What is mass?
A photon is single-particle exitation of the Maxwell 4-potential field which
itself is a real representation (i.e. its own uncharged antiparticle) of the
adjoint representation of the U(1) gauge group which also forms a massless
spin-1 unitary representation of the Poincare' group.
...
David Bowman
dbowman@gtc.georgetown.ky.us