Cosmological Perturbations with Multiple Fluids and Fields

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