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Prog. Theor. Phys. Vol. 69 No. 3 (1983) pp. 842-856
On the Creation of Particles through Their Interaction in an Expanding Universe
Yuhji Kuroda
Research Institute for Theoretical Physics, Hiroshima University, Takehara, Hiroshima 725
(Received July 26, 1982)
Abstract:
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.
URL :
http://ptp.ipap.jp/link?PTP/69/842/
DOI : 10.1143/PTP.69.842
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