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1

Max Planck Institute for Gravitational Physics, Albert Einstein Institute, D-14476 Potsdam, Germany

2

Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575, USA





*

Author to whom correspondence should be addressed.



Abstract We explore the possible cosmological consequences of a running Newton’s constant, G⎕, as suggested by the non-trivial ultraviolet fixed point scenario for Einstein gravity with a cosmological constant term. Here, we examine what possible effects a scale-dependent coupling might have on large-scale cosmological density perturbations. Starting from a set of manifestly covariant effective field equations, we develop the linear theory of density perturbations for a non-relativistic perfect fluid. The result is a modified equation for the matter density contrast, which can be solved and thus provides an estimate for the corrections to the growth index parameter, ɤ. View Full-Text

Keywords: quantum gravity; quantum cosmology; renormalization group; quantum infrared effects quantum gravity; quantum cosmology; renormalization group; quantum infrared effects





Author: Herbert W. Hamber 1,2,* and Reiko Toriumi 2

Source: http://mdpi.com/



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