The full energy of radiation of fixed distribution of electrical charges with instantaneous change in the properties of a two-axis crystal is calculated using representation of the tensor of dielectric permittivity of a medium in a covariant form (not a function of the selection of the coordinate system). The optical characteristics of the radiated waves are found in a linear approximation in terms of the small parameter - the degree of anisotropy of the medium, and an expression for the radiation energy in the case when only the degree of anisotropy of the medium is changed is analyzed.
Department of Quantum Theory and High Energy Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
Science News of the Faculty of Physics, Lomonosov Moscow State University
This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.