A note on the moduli-induced gravitino problem
Abstract
The cosmological moduli problem has been recently reconsidered. Papers [1,2] show that even heavy moduli (mφ > 105 GeV) can be a problem for cosmology if a branching ratio of the modulus into gravitini is large. In this paper, we discuss the tachyonic decay of moduli into the Standard Model's degrees of freedom, e.g. Higgs particles, as a resolution to the moduli-induced gravitino problem. Rough estimates on model dependent parameters set a lower bound on the allowed moduli at around 108 ~ 109 GeV.
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