Remarks on Hubble Induced Mass from Fermion Kinetic Term

Abstract

We evaluate the effective mass of a scalar field which interacts with visible sector via Planck-suppressed coupling in supergravity framework. We focus on the radiation-dominated (RD) era after inflation and the contribution from a fermionic field in the thermal bath. We find that, in RD era, the fermion kinetic term gives the effective mass of the order of Hubble scale to the scalar field.

Comments: 8 pages, v2: minor corrections made, published in PLB