Hubble Induced Mass in Radiation Dominated Universe

Abstract

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

10 pages, v2:minor corrections and a reference added, v3:a footnote added, version accepted by PLB

References in corpus (1)

• On the Role of Quasiparticles and thermal Masses in Nonequilibrium Processes in a Plasma

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