Cosmology constrains gravitational four-fermion interaction
arXiv:1210.7306 · doi:10.1088/1475-7516/2012/11/040
Abstract
If torsion exists, it generates gravitational four-fermion interaction (GFFI). This interaction gets dominating on the Planck scale. If one confines to the regular, axial-axial part of this interaction, the results do not comply with the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmology for the spatial flat or closed Universe. In principle, the anomalous, vector-vector interaction could restore the agreement.
Axial-axial and vector-vector contributions have been recalculated: the AA contribution is 4 times larger than in previous calculations, the VV contribution is the same, the conclusions have not changed