The process of interaction between a gravitational field and an electromagnetic field in the presence of an external gravitational field is examined for two classes of metric theories of gravitation. The results of this examination are used to find the conditions of resonance interaction and to show the possibility of continuous amplification of a planar electromagnetic wave by a planar gravitational wave. Numerical estimates of the possibility of formulating an experiment are given.
Department of Quantum Theory and High-Energy Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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