Particle creation in Kaluza-Klein cosmology.

Details Particle creation in Kaluza-Klein cosmology. Particle creation in Kaluza-Klein cosmology.

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phla..140..280w&link_type=abstract

Physics Letters A, Vol. 140, No. 6, p. 280 - 284

Physics

Cosmology: Particle Creation, Cosmology: Kaluza-Klein Theory

Scientific paper

The author exactly calculates the particle number N of scalar fields which are created from an initial vacuum in certain higher-dimensional cosmological models. The spacetimes in these models are the four-dimensional Chitre-Hartle or radiation-dominated universe with extra spaces which are static or power-law contracting. Except for some models in which no particles could be produced, the distribution of created particles shows a thermal behavior, at least in the limit of high three-dimensional "momentum" k. In some models, N does not depend on the magnitude of the extra-dimensional "momentum" kc if kc is nonvanishing. A cutoff momentum kc may emerge in some models, and particles with k ≤ kc could not be produced. The author discusses these results.

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