Production and dilution of gravitinos by modulus decay

Details Production and dilution of gravitinos by modulus decay Production and dilution of gravitinos by modulus decay

2004-03-04

arxiv.org/abs/hep-ph/0403043v2

Phys.Rev. D70 (2004) 043522

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 4 figures, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.70.043522

We study the cosmological consequences of generic scalar fields like moduli which decay only through gravitationally suppressed interactions. We consider a new production mechanism of gravitinos from moduli decay, which might be more effective than previously known mechanisms, and calculate the final gravitino-to-entropy ratio to compare with the constraints imposed by successful big bang nucleosynthesis (BBN) etc., taking possible hadronic decays of gravitinos into account. We find the modulus mass smaller than $\sim 10^4$ TeV is excluded. On the other hand, inflation models with high reheating temperatures $T_{R,\rm inf} \sim 10^{16}$ GeV can be compatible with BBN thanks to the late-time entropy production from the moduli decay if model parameters are appropriately chosen.

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