Relativistic kinetics and cosmology. I

A study is made of the problem of describing the cosmological expansion of a plasma in the framework of Chernikov's relativistic kinetic theory. It is shown that from the point of view of relativistic kinetics there are two stages in the evolution of the Universe in which thermodynamic equilibrium of the plasma is attained asymptotically: 1) the earliest ultrarelativistic stage, and 2) the nonrelativistic stage of the expansion, when the radiation is decoupled from the matter. It is shown that the relativistic kinetics of the plasma expansion at the time of decoupling of the radiation from the matter leads to transfer of energy from the photon component of the plasma to the electron component.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 42–47, August, 1980.     

R.F. Phenomena in nuclear gamma-resonance: Temporal Mössbauer spectroscopy,quasienergies and R.F. Collapse

The successful investigations of r.f. effects in NGR were recently in progress [1–3]. The purpose of this paper is to pay attention to some new theoretical results in this field which may be an object of the experimental realization.     

Relativistic Jets from Active Galactic Nuclei,edited by M. Boetttcher,D.E. Harris,and H. Krawczynski

Current theories of particle physics lead to the unavoidable conclusion that there must have been several phase transitions in the early Universe. Further, in the context of these theories, it is possible that cosmological phase transitions would have produced topological defects that may be roaming our heavens today. A finding of these fossils from the early Universe would provide a direct confirmation of the thermal history of the cosmos, insight into astrophysical phenomena, and vital information about particle physics. The elimination of unobserved topological defects provides important constraints on particle physics and may also suggest novel cosmology. I describe some of the research on cosmic topological defects and recent efforts to address cosmological issues in condensed matter systems.