On the Creation of Particles through Their Interaction in an Expanding Universe

Details On the Creation of Particles through Their Interaction in an Expanding Universe On the Creation of Particles through Their Interaction in an Expanding Universe

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pthph..69..842k&link_type=abstract

Progress of Theoretical Physics, Vol. 69, No. 3, pp. 842-856

Physics

3

Scientific paper

Some properties of the particle-creation rate by an interaction in two expanding model-universes with a big-bang origin are investigated by using a perturbative S-matrix formalism. It is shown that, in most cases, the lowest order particle creation rate from vacuum diverge in ultra-violet and infra-red regions in the summation of phase space. This is a new type of divergences owing to the expansion of the universe. We must then conclude that the perturbative S-matrix formulation is not in general available in a curved spacetime.

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