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

TL;DR

This paper develops a quasiclassical gravity theory in strong fields, deriving solutions for energy-momentum tensors, and explores implications for universe creation, particle creation, and non-Einsteinian cosmological branches.

Contribution

It introduces a half-quantum gravity framework with a novel non-local operator approach and quasilocalization, addressing universe creation and non-equilibrium thermodynamics.

Findings

Exact solutions for renormalized energy-momentum tensor

Demonstration of universe creation from 'nothing'

Analysis of non-Einsteinian cosmological branches

Abstract

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.