Method of calculating probabilities of quantum processes in external gravitational fields. II

A method is proposed for calculating amplitudes of arbitrary quantum processes in curved space-time for a system of interacting fields. A generalization of the diagram technique is presented, which permits the consideration of the situation where the initial and final vacuum states are different.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 4, pp. 55–61, April, 1979.The authors are grateful to V. P. Frolov for critical comments.