Tuesday, May 29, 2012

1205.5418 (Raghavan Rangarajan et al.)

Flat directions and gravitino production in SUSY models    [PDF]

Raghavan Rangarajan, Anjishnu Sarkar
Flat directions in supersymmetric models can get large vacuum expectation values in the early Universe which leads to a large mass for gauge bosons and gauginos. We point out that this can then result in enhanced gravitino production because the cross-section for the production of the +/- 1/2 helicity states of the gravitino is proportional to the square of the gaugino masses. We consider gravitino production after inflation in such a scenario and find that the abundance in some cases can be much larger than the upper bound on the gravtino abundance from cosmological constraints unless the flat direction field has a very small vacuum expectation value when it commences oscillating.
View original: http://arxiv.org/abs/1205.5418

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