arXiv subjects

Yu. S. Grishkan

Publications and source records attributed to Yu. S. Grishkan.

2 recordsLinked to original sources

arXiv2002

Time Delay of Radiation from Gamma-Ray Burst Sources as a Test for a Model of the Universe

The estimation of light velocity dispertion caused by quantum fluctuations influence on electromagnetic wave propogation in four-dimensional space-time is presented. Analytical cosmological solutions for the flat and open Universe for the case of cosmic vacuum model are obtained. The time delay of cosmic gamma-ray burst radiation is calculated. The delay is explained by propogation of dispersive electromagnetic wave in the expanding Universe. It is shown that the delay value depends on a model of the Universe. We conclude that to discern a model of the Universe measurement accuracy of parameter Δt / ΔE_γ should be better than 10^{-5} s / MeV.

astro-ph↗

arXiv1999

Quantum gravitational processes in a hot ultrarelativistic gas and their effect on the isotropic Universe evolution

The variant of quasiclassical (half-quantum) theory of gravity in strong gravitational field is presented. The exact solution of the problem of the renormalized energy-momentum tensor calculation is performed in terms of non-local operator-signed function. The procedure of quasilocalization is proposed, which leads to the equations of non-equilibrium thermodynamics for temperature and curvature. The effects of induced particle creation and media polarization are taking into account and used to solve the problem of non-Einstein's branches damping. The problem of Universe creation from "nothing" is also discussed.

gr-qc↗