Big bounce and closed universe from spin and torsion

2018/08/31 by Gabriel Unger, Nikodem Popławski, Nikodem J. Popławski · 1 voice
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Big Bounce #Big Crunch #Big Rip #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dark energy #De Sitter universe #Flatness problem #Geophysics and Gravity Measurements #Gravitation #Gravitational singularity #Inflation (cosmology) #Metric expansion of space #Particle horizon #Phantom energy #Physical cosmology #Physics #Quantum mechanics #Solar and Space Plasma Dynamics #Steady State theory #Theoretical physics #Torsion (gastropod) #Ultimate fate of the universe #Universe #Zero-energy universe #astro-ph.CO #gr-qc

paper · pdf · doi:10.3847/1538-4357/aaf169

published as Astrophys. J. 870, 78 (2019) · 10 pages, 1 table, 4 figures; published version

openalex publication_date 2019/01/10 · arxiv created 2019/03/01 · arxiv updated 2019/03/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

Citations

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Discussions

• I have recently read more about the Einstein-Cartan Theory and it seems to provide very interesting solutions (or hints thereof) that the General Relativity can't. Although it would not be the unifyin [stackexchange, -1 points]

Related

• Nonsingular, big-bounce cosmology from spinor-torsion coupling
• UNIVERSE IN A BLACK HOLE IN EINSTEIN–CARTAN GRAVITY
• Big bounce from spin and torsion
• Cosmology with torsion: An alternative to cosmic inflation
• Gravitational Collapse with Torsion and Universe in a Black Hole