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

Quantum Gravity and Cosmological Density Perturbations

1,2,* email and 2email
Received: 14 February 2014; in revised form: 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)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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.
Keywords: quantum gravity; quantum cosmology; renormalization group; quantum infrared effects
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MDPI and ACS Style

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

AMA Style

Hamber HW, Toriumi R. Quantum Gravity and Cosmological Density Perturbations. Galaxies. 2014; 2(2):275-291.

Chicago/Turabian Style

Hamber, Herbert W.; Toriumi, Reiko. 2014. "Quantum Gravity and Cosmological Density Perturbations." Galaxies 2, no. 2: 275-291.

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