Four-fermion interaction from torsion as dark energy

Details Four-fermion interaction from torsion as dark energy Four-fermion interaction from torsion as dark energy

2011-02-28

arxiv.org/abs/1102.5667v2

Gen.Relativ.Gravit.44:491-499,2012

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages; published version

Scientific paper

10.1007/s10714-011-1288-1

The observed small, positive cosmological constant may originate from a four-fermion interaction generated by the spin-torsion coupling in the Einstein-Cartan-Sciama-Kibble gravity if the fermions are condensing. In particular, such a condensation occurs for quark fields during the quark-gluon/hadron phase transition in the early Universe. We study how the torsion-induced four-fermion interaction is affected by adding two terms to the Dirac Lagrangian density: the parity-violating pseudoscalar density dual to the curvature tensor and a spinor-bilinear scalar density which measures the nonminimal coupling of fermions to torsion.

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