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 1475-7516Full text not available from this repository.
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.
|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|
|Deposited By:||Ms Margaret Calder|
|Deposited On:||18 Jun 2008 14:06|
|Last Modified:||24 Jan 2017 01:56|
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