Bulk viscosity and Kaluza-Klein models.

Details Bulk viscosity and Kaluza-Klein models. Bulk viscosity and Kaluza-Klein models.

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993rmxf...39....7c&link_type=abstract

Revista Mexicana de Fisica, Vol. 39, Suppl. 1, p. 7 - 12

Mathematics

Logic

Cosmology: Kaluza-Klein Theory

Scientific paper

The authors consider a Kaluza-Klein cosmological model with d non-compact and D compact space-like dimensions, an energy-momentum tensor depicting a fluid out of equilibrium, specifically they take a mixture of two gases, one is formed by relativistic particles while the other is a gas constituted by non-relativistic particles and they are not in thermodynamical equilibrium, such that a bulk viscosity term arises. Without actually solving the Einstein equations, the authors prove that the scale factor of the non-compact space is a monotonically increasing function of time, and that if the scale factor of the compact space reaches a maximum at a certain time, then the non-compact space is driven to expand rapidly. This suggests a possible way of solving the horizon problem.

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