Conditions for mode change of a rigid cavity

Abstract

Initial conditions for the existence of an earlier observed change in the mode of radiation of a nonuniformly moving linear cavity with fixed contents are considered. It is shown that the imaginary phase of radiation is independent of the homogeneous medium that fills an accelerated cavity with a fixed phase structure. From the law of conservation of energy in a uniform motion, it is obtained in the operator form that the radiation phase is invariant to the constant velocity of motion of a rigid cavity. The necessary and sufficient conditions for the existence of nontrivial solutions of the equation of state of radiation are discussed. The synchronism condition for the interfering branches of radiation by a nonuniformly moving source is found. It is established that, for two fields with complex phases, the interference term exceeds eight-fold the intensity of the initial beam.