Abstract
Based on quantum electrodynamics in Robertson-Walker universes the author develops a general scheme for the calculation of the emission of a photon by an electron. Because Poincare invariance does not apply in a time-dependent gravitational field this decay is possible even as a first-order process which, indeed, is inseparably accompanied by the creation of electron-positron pairs and photons from vacuum. Therefore both processes are considered together in an 'added-up' probability. This is explicitly evaluated for a time-symmetrically expanding radiation-dominated Friedman universe.
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