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Adiabatic and entropy perturbations with interacting fluids and fields

Malik, Karim A. and Wands, David (2005) Adiabatic and entropy perturbations with interacting fluids and fields. Journal of Cosmology and Astroparticle Physics, 0502. 007. ISSN 1475-7516

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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.

Item Type: Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords: cosmological perturbation theory ; physics of the early universe
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 9660
Deposited By: Ms Margaret Calder
Deposited On: 18 Jun 2008 14:06
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:40
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9660

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