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Tachyons in Throat Cosmology

Tachyonic 5d scalars are generically present in Randall-Sundrum-like models. In particular, they are known to be part of the 5d effective description of the Klebanov-Strassler throat. When moving from the IR to the UV region, the 5d bulk profile of Kaluza-Klein excitations of tachyons decays more slowly than that of massless scalars or the graviton. As a result, tachyons in many cases dominate the coupling between IR- and UV-localized sectors, leading to a very significant enhancement of energy-transfer or decay rates from the IR to the UV. This can dramatically affect the reheating of the Standard Model after brane inflation and the decay of throat dark matter.

preprint2010arXivOpen access
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