Primordial black holes and gravitational waves from nonminimally coupled supergravity inflation

Understand

We study the formation of primordial black holes and the generation of gravitational waves in a class of cosmological models that are direct supersymmetric analogs of the observationally favored nonminimally coupled Higgs inflation model.

• It is known that this type of model naturally includes multiple scalar fields which may be regarded as the inflaton.
• For the sake of simplicity we focus on the case where the inflaton field space is two dimensional.
• We analyze the multifield dynamics and find the region of parameters that gives copious production of primordial black holes that may comprise a significant part of the present dark matter abundance.