Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-09-05
Phys.Rev. D73 (2006) 086002
Physics
High Energy Physics
High Energy Physics - Theory
V2. Minor Clarifications V3. appendix and 2 figures added, typos corrected, conclusions unchanged 12 pages, 6 figures
Scientific paper
10.1103/PhysRevD.73.086002
In this report, we study within the context of general relativity with one extra dimension compactified either on a circle or an orbifold, how radion fluctuations interact with metric fluctuations in the three non-compact directions. The background is non-singular and can either describe an extra dimension on its way to stabilization, or immediately before and after a series of non-singular bounces. We find that the metric fluctuations transfer undisturbed through the bounces or through the transients of the pre-stabilization epoch. Our background is obtained by considering the effects of a gas of massless string modes in the context of a consistent 'massless background' (or low energy effective theory) limit of string theory. We discuss applications to various approaches to early universe cosmology, including the ekpyrotic/cyclic universe scenario and string gas cosmology.
Battefeld Thorsten J.
Brandenberger Robert H.
Patil Subodh P.
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