Cosmological Perturbations with Multiple Fluids and Fields

Details Cosmological Perturbations with Multiple Fluids and Fields Cosmological Perturbations with Multiple Fluids and Fields

2001-03-15

arxiv.org/abs/astro-ph/0103244v3

Class.Quant.Grav.19:527-550,2002

Astronomy and Astrophysics

Astrophysics

19 pages, 6 figures, revised thoroughly; published version in Class. Quant. Grav

Scientific paper

10.1088/0264-9381/19/3/308

We consider the evolution of perturbed cosmological spacetime with multiple fluids and fields in Einstein gravity. Equations are presented in gauge-ready forms, and are presented in various forms using the curvature (\Phi or \phi_\chi) and isocurvature (S_{(ij)} or \delta \phi_{(ij)}) perturbation variables in the general background with K and \Lambda. We clarify the conditions for conserved curvature and isocurvature perturbations in the large-scale limit. Evolutions of curvature perturbations in many different gauge conditions are analysed extensively. In the multi-field system we present a general solution to the linear order in slow-roll parameters.

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