Flat directions and gravitino production in SUSY models
  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.
