R.G. Petrosyan

TL;DR: In this paper, the propagation and transformation of electromagnetic waves through spatially homogeneous yet smoothly time-dependent media within the framework of classical electrodynamics is explored. But the authors do not consider the effect of the time-varying permittivity of the media.

TL;DR: In this paper, the propagation of sound through a spatially homogeneous but non-stationary medium is investigated within the framework of fluid dynamics, and a generalized wave equation is derived for the (scalar) potential of the fluid velocity distribution in dependence of the equilibrium mass density of fluid and the sound wave velocity.

TL;DR: In this paper, it was shown that the traveling wave acts as a stationary diffraction grating from which electrons can diffract, similar to the conventional Kapitza-Dirac effect.

TL;DR: In this paper, the reflection and transmission coefficients for both amplitudes and intensities of sound and electromagnetic waves are obtained for non-stationary media, and quantitative relations between the reflection coefficients of both sound and EM waves are given.

TL;DR: In this article, the authors considered the high-energy neutrons scattering in a crystal under the influence of an external laser wave field and showed that the process is inelastic with respect to the laser wave and at the same time it is elastic to a crystal.