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Prog. Theor. Phys. Vol. 67 No. 5 (1982) pp. 1415-1440

Statistical Effect of Interactions on Particle Creation in Expanding Universe

Hideo Kodama

Department of Physics, Kyoto University, Kyoto 606

(Received September 2, 1981)

Abstract:

The statistical effect of interactions which drives many-particle systems toward equilibrium is expected to change the qualitative and quantitative features of particle creation in expanding universe. To investigate this problem a simplified model called the finite-time reduction model is formulated and applied to the scalar particle creation in the radiation dominant Friedmann universe. The number density of created particles and the entropy production due to particle creation are estimated. The result for the number density is compared with that in the conventional free field theory. It is shown that the statistical effect increases the particle creation and lengthens the active creation period. As for the entropy production it is shown that it is negligible for scalar particles in the Friedmann universe.

URL : http://ptp.ipap.jp/link?PTP/67/1415/
DOI : 10.1143/PTP.67.1415

[ Full Text PDF : FREE ACCESS (1042K) ] Citation: Plain Text BiBTeX EndNote(RIS) RSS

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Citing Article(s) :

1. Progress of Theoretical Physics Vol. 70 No. 2 (1983) pp. 394-411 :

   Gauge-Invariant Scalar Perturbations in the New Inflationary Universe

   Misao Sasaki

2. Progress of Theoretical Physics Vol. 72 No. 4 (1984) pp. 782-798 :

   Entropy Production in the Inflationary Universe

   Masahiro Morikawa and Misao Sasaki

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