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In special relativity it is often claimed that light does not need a medium to propagate.
In quantum field theory, particles (and thus also photons) are excitations of fields. The the position is not a dinamical variable as such anymore, but just a label for each of the field excitations in space.
Does then QTF tell us that light, as quanta of EM waves, propagates indeed over a medium (the electromagnetic field permeating the whole space)?
Thanks.
In quantum field theory, particles (and thus also photons) are excitations of fields. The the position is not a dinamical variable as such anymore, but just a label for each of the field excitations in space.
Does then QTF tell us that light, as quanta of EM waves, propagates indeed over a medium (the electromagnetic field permeating the whole space)?
Thanks.