Cosmological Expansion in the Presence of an Extra Dimension

Abstract

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.

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

References in corpus (1)

• A Large Mass Hierarchy from a Small Extra Dimension

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