COSMOLOGICAL PERTURBATIONS IN RENORMALIZATION GROUP DERIVED COSMOLOGIES
A. BONANNOINAF — Osservatorio Astrofisico di Catania, Via S.Sofia 78, I-95123 Catania, ItalyM. REUTERInstitut für Physik, Universität Mainz, Staudingerweg 7, D-55099 Mainz, Germany
2004en
ABI
Abstract
A linear cosmological perturbation theory of an almost homogeneous and isotropic perfect fluid Universe with dynamically evolving Newton constant G and cosmological constant Λ 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 Λ are thus obtained. Explicit solutions are discussed in cosmologies where both G and Λ vary according to renormalization group equations in the vicinity of a fixed point.
Identifiers
Citations and references
Cited by 20 references