Limiting energy density and a regular accelerating Universe in Riemann-Cartan spacetime
A. V. Minkevich
Department of Theoretical Physics and Astrophysics, Belarussian State University, 220030 Minsk, Belarus
Department of Physics and Computer Methods, Warmia and Mazury University in Olsztyn, 10-561 Olsztyn, Poland
Abstract
Isotropic cosmology built in the Riemann-Cartan spacetime by using
sufficiently general expression of gravitational Lagrangian is investigated. It
is shown that cosmological equations obtained by certain restrictions on
indefinite parameters of gravitational Lagrangian lead to limiting energy
density at the beginning of cosmological expansion and all cosmological models
filled with usual gravitating matter satisfying standard energy conditions are
regular with respect to energy density, spacetime metrics with its time
derivative and torsion functions. At asymptotics cosmological solutions of
spatially flat models coincide with that of standard Λ CDM-model for
accelerating Universe.