Cosmological evolution of a torsion-induced quintaxion

Details Cosmological evolution of a torsion-induced quintaxion Cosmological evolution of a torsion-induced quintaxion

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvd..73d3521m&link_type=abstract

Physical Review D, vol. 73, Issue 4, id. 043521

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15

Particle-Theory And Field-Theory Models Of The Early Universe, Gravity In More Than Four Dimensions, Kaluza-Klein Theory, Unified Field Theories, Alternative Theories Of Gravity, Axions And Other Nambu-Goldstone Bosons, Dark Matter

Scientific paper

In an affine prolongation of general relativity, the minimal coupling of Dirac fields to gravity naturally provides an axial current interaction. We demonstrate that the cancellation of the translational curvature, i.e. torsion, in the chiral anomaly induces a dynamical axion coupled with gravitational strength. Because of a geometrical identity, our torsion-induced pseudoscalar couples to the Einstein equations with an effective energy-momentum tensor which automatically satisfies the quintessence condition w<-1/3 for the equation of state parameter. In a toy model of an axion-dominated Universe, this leads to an anharmonic oscillatory evolution for which the deceleration parameter is within the range of current observations.

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