Poincaré gauge theory of gravity, gravitational interaction and regular accelerating universe

Abstract

The place and physical significance of Poincaré gauge theory of gravity (PGTG) as necessary generalization of metric gravitation theory in the framework of gauge approach to gravitation is discussed. Isotropic cosmology built in the framework of PGTG based on general expression of gravitational Lagrangian including both a scalar curvature and quadratic in the curvature and torsion invariants with indefinite parameters is considered. The most important physical consequences connected with the change of gravitational interaction, with possible existence of limiting energy density and gravitational repulsion at extreme conditions, and also with the vacuum repulsion effect are discussed. The solution of the problem of cosmological singularity and dark energy problem in the frame of isotropic cosmology built on the base of PGTG is given.

Limiting energy density and gravity in Riemann-Cartan space-time

“…1 The conclusion about possible existence of limiting energy density was obtained by investigation of isotropic cosmology built in the frame of GTRC (see e.g. [5][6][7][8]). Gravitational interaction at extreme conditions (extremely high energy densities ε JCAP03(2022)027 and pressures p) near limiting energy density is repulsive excluding the appearance of singular state with divergent energy density.…”