Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 13, Issue 1, Pages 107-121Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271804003809
Keywords
cosmology; renormalization group theory; large scale structure in the Universe
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A linear cosmological perturbation theory of an almost homogeneous and isotropic perfect fluid Universe with dynamically evolving Newton constant G and cosmological constant A 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 A are thus obtained. Explicit solutions are discussed in cosmologies where both G and A vary according to renormalization group equations in the vicinity of a fixed point.
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