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Galaxies 2014, 2(2), 275-291; doi:10.3390/galaxies2020275

Quantum Gravity and Cosmological Density Perturbations

Max Planck Institute for Gravitational Physics, Albert Einstein Institute, D-14476 Potsdam, Germany
Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575, USA
Author to whom correspondence should be addressed.
Received: 14 February 2014 / Revised: 10 May 2014 / Accepted: 27 May 2014 / Published: 11 June 2014
(This article belongs to the Special Issue Particle Physics and Quantum Gravity Implications for Cosmology)
View Full-Text   |   Download PDF [257 KB, uploaded 11 June 2014]


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
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Hamber, H.W.; Toriumi, R. Quantum Gravity and Cosmological Density Perturbations. Galaxies 2014, 2, 275-291.

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