- #1

rumborak

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Some sites mention virtual photons being used to describe static fields, but the description sounded really shoehorned, since they were assumed to be a special kind of photon that doesn't carry any momentum.

Can anyone outline how arbitrarily varying EM fields, e.g. a step function, are described with photons? (Or is it just a Fourier transform of the signal, and the spectrum describes the distribution of the virtual photons?)