Cosmological consequences of gravity with spin and torsion

Abstract The consistency of the gravitational field with the quantum-mechanical, spin angular momentum of matter requires space time to be endowed with curvature and torsion. The Einstein-Cartan-Sciama-Kibble theory of gravity, which extends general relativity to include torsion, may eliminate the singularity at the big bang and replace it with a nonsingular bounce. Gravity with spin and torsion may also solve several major problems in cosmology : singularities in black holes, the origin of the Universe, the flatness and horizon poblems, the arrow of time, the matter-antimatter asymmetry in the Universe, the nature of dark matter and dark energy, and the p referred axis in the Universe.