2011/11/30 by Nikodem J. Popławski, Nikodem Poplawski · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Pulsars and Gravitational Waves Research #astro-ph.CO #gr-qc
paper · pdf · doi:10.1103/physrevd.85.107502
published as Phys. Rev. D 85, 107502 (2012) · 7 pages; published version
openalex publication_date 2012/05/29 · arxiv created 2012/07/04 · arxiv updated 2012/07/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The Einstein-Cartan-Sciama-Kibble theory of gravity removes the constraint of general relativity that the affine connection be symmetric by regarding its antisymmetric part, the torsion tensor, as a dynamical variable. The minimal coupling between the torsion tensor and Dirac spinors generates a spin-spin interaction which is significant in fermionic matter at extremely high densities. We show that such an interaction averts the unphysical big-bang singularity, replacing it with a cusp-like bounce at a finite minimum scale factor, before which the Universe was contracting. This scenario also explains why the present Universe at largest scales appears spatially flat, homogeneous and isotropic.