Self-consistent cosmological perturbations from thermal field theory

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Abstract
Finite-temperature field theory is used for a self-consistent and manifestly gauge-invariant derivation of the effective field equations governing the evolution of adiabatic perturbations of a homogeneous, isotropic cosmological model dominated by an ultrarelativistic plasma of weakly interacting particles in thermal equilibrium. Solutions are obtained in the form of rapidly converging power-series expansions.