Next Article in Journal
The Inner Regions of Disk Galaxies: A Constant Baryonic Fraction?
Previous Article in Journal
Satellite Galaxy Velocity Dispersions in the SDSS and Modified Gravity Models
Previous Article in Special Issue
String Phenomenology: Past, Present and Future Perspectives
Galaxies 2014, 2(2), 275-291; doi:10.3390/galaxies2020275
Article

Quantum Gravity and Cosmological Density Perturbations

1,2,*  and 2
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.
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]

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 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).
SciFeed

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote |
RIS
MDPI and ACS Style

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

View more citation formats

Related Articles

Article Metrics

Comments

[Return to top]
Galaxies EISSN 2075-4434 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert