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

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

2011-12-31

arxiv.org/abs/1201.0316v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages

Scientific paper

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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