Adiabatic and entropy perturbations with interacting fluids and fields
Abstract
We develop a gauge-invariant formalism for the study of density perturbations in a Friedmann-Robertson-Walker universe with multiple interacting fluids and/or scalar fields. We show how N scalar fields may be described by N kinetic fluids (with maximally stiff equation of state) interacting with a non-dynamical potential (with vacuum equation of state). We split generic perturbations into adiabatic and entropic parts, and give the coupled first-order evolution equations on all scales, including energy and momentum exchange. We identify the non-adiabatic effects on large scales, and define adiabatic initial conditions in the presence of multiple fluids and fields.
Cite
@article{arxiv.astro-ph/0411703,
title = {Adiabatic and entropy perturbations with interacting fluids and fields},
author = {Karim A. Malik and David Wands},
journal= {arXiv preprint arXiv:astro-ph/0411703},
year = {2009}
}
Comments
20 pages, no figures, revtex4; v2: minor changes, typos corrected, references added