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Big bounce and closed universe from spin and torsion

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arxiv 1808.08327 v2 pith:VWUI6PD3 submitted 2018-08-24 gr-qc astro-ph.CO

Gabriel Unger , Nikodem Pop{l}awski This is my paper · ORCID
classification gr-qcastro-ph.CO
keywords universebounceclosedproductspinthresholdtorsionacceleration
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abstract

We analyze the dynamics of a homogeneous and isotropic universe in the Einstein$--$Cartan theory of gravity. The coupling between the spin and torsion prevents gravitational singularities and replaces the Big Bang with a nonsingular big bounce, at which the universe transitions from contraction to expansion. We show that a closed universe exists only when the product of the scale factor and temperature is higher than a particular threshold, contrary to a flat universe and an open universe, which are not restricted. During inflation, this product must increase to another threshold, so that the universe can reach dark-energy acceleration.

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  1. Torsional pseudo-inflation beyond Einstein-Cartan

    gr-qc 2026-08 conditional novelty 5.0 of 10

    Spin-fluid torsion cannot sustain inflation beyond about 0.46 e-folds, but a coupling-fed axial torsion condensate can hold an exact de Sitter background with an algebraic exit.

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