On the number and spin of photons in classical electromagnetic field

25 Oct 2018 Feshchenko R M Vinogradov A. V.

A relativistically invariant expression for the number of photons in free classical electromagnetic field through the currents, that created the field, is derived based on the formula for the total energy--momentum of the field. It is demonstrated that it corresponds to the classical limit of the photon number operator known from the quantum electrodynamics... (read more)

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