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ZhETF, Vol. 123, No. 2, p. 211 (February 2003)
(English translation - JETP, Vol. 96, No. 2, p. 180, February 2003 available online at )

Nikishov A.I.

Received: July 8, 2002

PACS: 11.55.-m, 12.20.-m

DJVU (139.6K) PDF (282.6K)

We consider the problem of fixing the phases of Bogoliubov coefficients in quantum electrodynamics such that the vacuum-vacuum amplitude can be expressed through them. For a constant electric field and particles with spins 0 and 1/2, this is done starting from the definition of these coefficients. Using the symmetry between electric and magnetic fields, we extend the result to a constant electromagnetic field. It turns out that for a constant magnetic field, it is necessary to distinguish the in- and out-states, although they differ only by a phase factor. For a spin-1 particle with the gyromagnetic ratio g=2, this approach fails and we reconsider the problem using the proper-time method.

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