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This book discusses the following theoretical questions: - stability of electromagnetic vacuum near horizons; - behavior of an information near horizons; - topology of the real space; - synchronization of sources of electromagnetic radiation in the early stages of the development of the Universe, as well as a number of purely practical questions: - the nature of the modes in a spherical resonator; - the mechanism of focusing of spherical electromagnetic waves (EMW); - ponderomotive effect of EMW on material charged particles.