Reheating from Tachyon Condensation

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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20 pages, 10 figures; corrected discussion of kink-antikink formation

Scientific paper

10.1088/1126-6708/2002/11/041

We argue that it may be possible to reheat the universe after inflation driven by D-brane annihilation, due to the coupling of massless fields to the time-dependent tachyon condensate which describes the annihilation process. This mechanism can work if the original branes annihilate to a stable brane containing the standard model. Given reasonable assumptions about the shape of the tachyon background configuration and the size of the relevant extra dimension, the reheating can be efficient enough to overcome the problem of the universe being perpetually dominated by cold dark tachyon matter. In particular, reheating is most efficient when the final brane codimension is large, and when the derivatives of the tachyon background are large.

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