Dissipation coefficients for supersymmetric inflatonary models

摘要

Dissipative effects can lead to a friction term in the equation of motion foran inflaton field during the inflationary era. The friction term may be linearand localised, in which case it is described by a dissipation coefficient. Thedissipation coefficient is calculated here in a supersymmetric model with a twostage decay process in which the inflaton decays into a thermal gas of lightparticles through a heavy intermediate. At low temperatures, the dissipationcoefficient $\propto T^3$ in a thermal approximation. Results are also givenfor a non-equilibrium anzatz. The dissipation coefficient is consistent with awarm inflationary regime for moderate ($\sim 0.1$) values of the couplingconstants.