Cosmological Expansion in the Presence of an Extra Dimension

Details Cosmological Expansion in the Presence of an Extra Dimension Cosmological Expansion in the Presence of an Extra Dimension

1999-06-28

arxiv.org/abs/hep-ph/9906523v4

Phys.Rev.Lett. 83 (1999) 4245

Physics

High Energy Physics

High Energy Physics - Phenomenology

4pp, latex, 1 figure; added and corrected references; revised incorrect argument about sign of action on brane; final version

Scientific paper

10.1103/PhysRevLett.83.4245

It has recently been pointed out that global solutions of Einstein's equations for a 3-brane universe embedded in 4 spatial dimensions give rise to a Friedmann equation of the form H ~ rho on the brane, instead of the usual H ~ (rho)^{1/2}, which is inconsistent with cosmological observations. We remedy this problem by adding cosmological constants to the brane and the bulk, as in the recent scenario of Randall and Sundrum. Our observation allows for normal expansion during nucleosynthesis, but faster than normal expansion in the very early universe, which could be helpful for electroweak baryogenesis, for example.

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