Cosmological Perturbations in Renormalization Group Derived Cosmologies

Details Cosmological Perturbations in Renormalization Group Derived Cosmologies Cosmological Perturbations in Renormalization Group Derived Cosmologies

2002-10-21

arxiv.org/abs/astro-ph/0210472v2

Int.J.Mod.Phys. D13 (2004) 107-122

Astronomy and Astrophysics

Astrophysics

22 pages, revtex, subeqn.sty, to appear on IJMPD

Scientific paper

10.1142/S0218271804003809

A linear cosmological perturbation theory of an almost homogeneous and isotropic perfect fluid Universe with dynamically evolving Newton constant $G$ and cosmological constant $\Lambda$ is presented. A gauge-invariant formalism is developed by means of the covariant approach, and the acoustic propagation equations governing the evolution of the comoving fractional spatial gradients of the matter density, $G$, and $\Lambda$ are thus obtained. Explicit solutions are discussed in cosmologies where both $G$ and $\Lambda$ vary according to renormalization group equations in the vicinity of a fixed point.

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