25 research outputs found
Short-wave Approximation For Macroscopic Cosmology with Higgs Scalar Field
Based on the macroscopic equations of cosmological evolution obtained earlier
by the Author, a closed system of macroscopic Einstein equations in the
short-wave approximation for perturbations of the scalar Higgs and
gravitational fields has been obtained and examined. The obtained exact
solutions of macroscopic equations are determined by three microscopic
parameters, depending on the spectrum of perturbations.Comment: 10 pages., 3 figures, 10 reference
Kinetic equations for ultrarelativistic particles in a Robertson-Walker Universe and isotropization of relict radiation by gravitational interactions
Kinetic equations for ultrarelativistic particles with due account of
gravitational interactions with massive particles in the Robertson-Walker
universe are obtained. On the basis of an exact solution of the kinetic
equations thus obtained, a conclusion is made as to the high degree of the
uniformity of the relict radiation on scales with are less than .Comment: 19 pages, 2 figures, 13 reference
Charged multifluids in general relativity
The exact 1+3 covariant dynamical fluid equations for a multi-component
plasma, together with Maxwell's equations are presented in such a way as to
make them suitable for a gauge-invariant analysis of linear density and
velocity perturbations of the Friedmann-Robertson-Walker model. In the case
where the matter is described by a two component plasma where thermal effects
are neglected, a mode representing high-frequency plasma oscillations is found
in addition to the standard growing and decaying gravitational instability
picture. Further applications of these equations are also discussed.Comment: 14 pages (example added), to appear in Class. Quantum Gra