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Thermal fluctuations in Einstein-Cartan-Sciama-Kibble-Dirac bouncing cosmology

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arxiv 1201.0316 v1 pith:QHEIG5BB submitted 2011-12-31 astro-ph.CO gr-qc

Nikodem J. Poplawski This is my paper · ORCID
classification astro-ph.COgr-qc
keywords cosmologyfermionicfluctuationsmatterperturbationsscale-invariantspectrumspin
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We study cosmological perturbations arising from thermal fluctuations in the big-bounce cosmology in the Einstein-Cartan-Sciama-Kibble theory of gravity. We show that such perturbations cannot have a scale-invariant spectrum if fermionic matter minimally coupled to the torsion tensor is macroscopically averaged as a spin fluid, but have a scale-invariant spectrum if the Dirac form of the spin tensor of the fermionic matter is used.

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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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