Conversion of Goldstone bosons into gravitons in anisotropic cosmology

Details Conversion of Goldstone bosons into gravitons in anisotropic cosmology Conversion of Goldstone bosons into gravitons in anisotropic cosmology

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvd..42.2632h&link_type=abstract

Physical Review D (Particles and Fields), Volume 42, Issue 8, 15 October 1990, pp.2632-2637

Mathematics

Logic

Chiral Symmetries, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

The gravitational chiral anomaly makes possible the conversion of a Goldstone boson into a graviton in a background gravitational field. We show that the interaction Lagrangian for this process does not vanish if and only if the background metric has a nonvanishing Weyl tensor, i.e., if it is not conformally flat. No conversion takes place in an isotropic expanding universe. We evaluate the probability for the conversion of Goldstone bosons into gravitons in Bianchi type-I background metrics, the simplest anisotropic cosmological backgrounds.

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