Four-fermion interaction from torsion as dark energy
Abstract
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.
- Publication:
-
General Relativity and Gravitation
- Pub Date:
- February 2012
- DOI:
- 10.1007/s10714-011-1288-1
- arXiv:
- arXiv:1102.5667
- Bibcode:
- 2012GReGr..44..491P
- Keywords:
-
- Einstein-Cartan-Sciama-Kibble gravity;
- Torsion;
- Spin;
- Dirac Lagrangian;
- Hehl-Datta equation;
- Four-fermion interaction;
- Cosmological constant;
- Quark condensate;
- Parity;
- Nonminimal coupling;
- General Relativity and Quantum Cosmology;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- High Energy Physics - Theory
- E-Print:
- 6 pages