Large-scale curvature and entropy perturbations for multiple interacting fluids

Details Large-scale curvature and entropy perturbations for multiple interacting fluids Large-scale curvature and entropy perturbations for multiple interacting fluids

2002-11-27

arxiv.org/abs/astro-ph/0211602v3

Phys.Rev.D67:063516,2003

Astronomy and Astrophysics

Astrophysics

14 pages, latex with revtex, 5 figures; v2 typos corrected; v3 typos corrected, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.063516

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.

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