Physics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jpha...13..961b&link_type=abstract
Journal of Physics A - Mathematical and General, vol. 13, Mar. 1980, p. 961-968. Research supported by the Science Research Cou
Physics
21
Elementary Particle Interactions, Field Theory (Physics), Particle Production, Relativity, Universe, Electromagnetic Fields, Metric Space, Perturbation Theory, S Matrix Theory, Space-Time Functions
Scientific paper
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.
Birrell N. D.
Davies Paul C. W.
Ford L. H.
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