Cosmological Moduli Problem from Thermal Effects

Details Cosmological Moduli Problem from Thermal Effects Cosmological Moduli Problem from Thermal Effects

2008-11-04

arxiv.org/abs/0811.0444v2

Phys.Lett.B670:434-436,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 1 figure; to appear in PLB

Scientific paper

10.1016/j.physletb.2008.11.046

We estimate the cosmological abundance of a modulus field that has dilatonic couplings to gauge fields, paying particular attention to thermal corrections on the modulus potential. We find that a certain amount of the modulus coherent oscillations is necessarily induced by a linear thermal effect. We argue that such an estimate provides the smallest possible modulus abundance for a given thermal history of the Universe. As an example we apply our results to a saxion, a bosonic supersymmetric partner of an axion, and derive a tight bound on the reheating temperature. We emphasize that the problem cannot be avoided by fine-tuning the initial deviation of the modulus field, since the minimal amount of the modulus is induced by the dynamics of the scalar potential.

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