Effects of field interactions upon particle creation in Robertson-Walker universes
- 1 March 1980
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 13 (3), 961-968
- https://doi.org/10.1088/0305-4470/13/3/028
Abstract
Particle creation due to field interactions in an expanding Robertson-Walker universe is investigated. A model in which pseudoscalar mesons and photons are created as a result of their mutual interaction is considered, and the energy density of created particles is calculated in model universes which undergo a bounce at some maximum curvature. The free-field creation of non-conformally coupled scalar particles and of gravitons is calculated in the same space-times. It is found that if the bounce occurs at a sufficiently early time the interacting particle creation will dominate. This result may be traced to the fact that the model interaction chosen introduces a length scale which is much larger than the Planck length.Keywords
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