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
Full text not available from this repository.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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