Could someone comment on that?It is sometimes said that all photons are virtual photons. This is because the world-lines of photons always resemble the dotted line in the above Feynman diagram: the photon was emitted somewhere (say, a distant star), and then is absorbed somewhere else (say a photoreceptor cell in the eyeball). Furthermore, in the photon's frame of reference, no time elapses between emission and absorption. This statement illustrates the difficulty of trying to distinguish between "real" and "virtual" particles as mathematically they are the same objects and it is only our definition of "reality" which is at weakness here.
It's always the same thing that bites us!Ratzinger said:this article says
Could someone comment on that?
Is it correct to say that all fundamental fields are transmitted by virtual particle, but if these fields are disturbed, so if they set in wave motion then real particle (well-defined in energy) propagate and only then energy gets exchanged?