Effects of field interactions upon particle creation in Robertson-Walker universes

N. D. Birrell, P. C.W. Davies, L. H. Ford

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)961-968
Number of pages8
JournalJournal of Physics A: Mathematical and General
Issue number3
StatePublished - Mar 1 1980
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Physics and Astronomy(all)


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