  Coherent oscillations of the inflaton field at the end of inflation can
parametrically excite fermions in much the same way that bosons are created in
preheating. Although Pauli-blocking prohibits the occupation number of created
fermions from growing exponentially, fermion production occurs in a manner
significantly different from the expectations of simple perturbation theory.
Here, I discuss the nature of fermion production after inflation and possible
applications including the efficient transfer of inflaton energy and the
production of super-massive fermions during fermionic preheating.

High Energy Physics - Phenomenology;Astrophysics;High Energy Physics - Theory