Reheating a multi-throat universe by brane motion |
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Authors: | Shinji Mukohyama |
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Institution: | (1) Department of Physics and Research Center for the Early Universe, The University of Tokyo, Tokyo 113-0033, Japan;(2) Institute for the Physics and Mathematics of the Universe, University of Tokyo, Chiba 277-8568, Japan |
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Abstract: | We propose a mechanism of reheating after inflation in multi-throat scenarios of warped extra dimensions. Validity of an effective
field theory on the standard model (SM) brane requires that the position of the SM brane during inflation be different from
the position after inflation. The latter is supposed to be near the tip of the SM throat but the former is not. After inflation,
when the Hubble expansion rate becomes sufficiently low, the SM brane starts moving towards the tip and eventually oscillates.
The SM fields are excited by the brane motion and the universe is reheated. Since interaction between the brane position modulus
and the SM fields is suppressed only by the local string scale, the modulus effectively decays into the SM fields. |
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Keywords: | Extra dimensions Brane world Cosmology |
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