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We reconsider the effective mass of a scalar field which interact withvisible sector via Planck-suppressed coupling in supergravity framework. Wefocus on the radiation-dominated (RD) era after inflation. In this era, theeffective mass is given by thermal average of interaction terms. To make ouranalysis clear, we rely on Kadanoff-Baym equations to evaluate the thermalaverage. We find that, in RD era, a scalar field acquires the effective mass ofthe order of $H$.

Hubble Induced Mass in Radiation Dominated Universe