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• W1977473468 abstract "We present a gauge-invariant formalism to study the evolution of curvature perturbations in a Friedmann-Robertson-Walker universe filled by multiple interacting fluids. We resolve arbitrary perturbations into adiabatic and entropy components and derive their coupled evolution equations. We demonstrate that perturbations obeying a generalised adiabatic condition remain adiabatic in the large-scale limit, even when one includes energy transfer between fluids. As a specific application we study the recently proposed curvaton model, in which the curvaton decays into radiation. We use the coupled evolution equations to show how an initial isocurvature perturbation in the curvaton gives rise to an adiabatic curvature perturbation after the curvaton decays." @default.
• W1977473468 created "2016-06-24" @default.
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• W1977473468 date "2003-03-27" @default.
• W1977473468 modified "2023-09-25" @default.
• W1977473468 title "Large-scale curvature and entropy perturbations for multiple interacting fluids" @default.
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• W1977473468 doi "https://doi.org/10.1103/physrevd.67.063516" @default.
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