Towards a realistic Kaluza-Klein cosmology

Details Towards a realistic Kaluza-Klein cosmology Towards a realistic Kaluza-Klein cosmology

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phlb..137..155s&link_type=abstract

Physics Letters B, Volume 137, Issue 3-4, p. 155-159.

Physics

172

Scientific paper

Einstein's equations are solved for a class of spatially homogeneous, anisotropic, perfect fluid, cosmological models in 1 + d +D dimensions (d, D arbitrary). Is is found that they can in general lead to universes with 3 dimensions expanding and D contracting. Furthermore, assuming this process to be isentropic, the temperature T is found to eventually drop below 1/R (R = radius of the compact space). A scenario for how the universe can pass from the multi-dimensional phase to the usual Friedman-Robertson-Walker one at this point, is then outlined. The horizon problem for these models is examined. It is found that the entropy falling within a causal horizon at the point of dimensional reduction is essentially a free parameter.

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