De Sitter spacetime with torsion as physical spacetime in the vacuum

Homogeneous isotropic models built in the framework of the Poincar'e gauge theory of gravity (PGTG) based on general expression of gravitational Lagrangian without cosmological constant are analyzed. It is shown that the physical spacetime in the vacuum in the frame of PGTG can have the structure of flat de Sitter spacetime with torsion. Some physical consequences of obtained conclusion are discussed.