2011/10/16 by Guo-Ying Qi, Yongxin Guo, Qi, Guo-Ying +2
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Relativity and Gravitational Theory #gr-qc
paper · pdf · doi:10.48550/arxiv.1110.3448
9 pages
arxiv created 2011/10/16 · openalex publication_date 2011/10/16 · arxiv updated 2011/10/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A exact de Sitter-like cosmological solution of quadratic gravitation with torsion has been found. In the limit of constant energy and pressure, it becomes a exact de Sitter spacetime. It exists in a wide class of quadratic gravity theories and is the same in vacuum for all the models in this class, no matter how the coefficients of the quadratic terms in the Lagrangian are. It describes an accelerating universe and gives a cosmological constant which is of the order of magnitude of the observed value. In vacuum the universe is a de Sitter spacetime without torsion. When matter presents, however, the spacetime is equipped with curvature as well as torsion. In other wards torsion can be generated by the energy-momentum of matter (energy and pressure).