Dimensional reduction in the early universe: Where have the massive particles gone?

Details Dimensional reduction in the early universe: Where have the massive particles gone? Dimensional reduction in the early universe: Where have the massive particles gone?

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phlb..135..378k&link_type=abstract

Physics Letters B, Volume 135, Issue 5-6, p. 378-382.

Physics

99

Scientific paper

In many models based on reduction from greater than four dimensions, there are absolutely stable particles with masses of order R-1 (R is the compactification scale). If the temperature of the universe were ever close to R-1, these massive states would have been present and some would have survived annihilation. We calculate the present mass density due to these particles and find both the five-dimensional model and some versions of N = 8 supergravity to be unacceptable. We discuss some possible solutions to this problem.

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