Abstract
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.
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Halter, S., Harling, B.v. & Hebecker, A. Tachyons in throat cosmology. J. High Energ. Phys. 2010, 63 (2010). https://doi.org/10.1007/JHEP02(2010)063
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DOI: https://doi.org/10.1007/JHEP02(2010)063