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.Comment: 8 pages, v2: minor corrections made, published in PL