The WiggleZ Dark Energy Survey: Constraining the evolution of Newton's constant using the growth rate of structure

Nesseris, Savvas, Blake, Chris, Davis, Tamara and Parkinson, David (2011) The WiggleZ Dark Energy Survey: Constraining the evolution of Newton's constant using the growth rate of structure. Journal of Cosmology and Astroparticle Physics, 2011 7: 1-22. doi:10.1088/1475-7516/2011/07/037


Author Nesseris, Savvas
Blake, Chris
Davis, Tamara
Parkinson, David
Title The WiggleZ Dark Energy Survey: Constraining the evolution of Newton's constant using the growth rate of structure
Journal name Journal of Cosmology and Astroparticle Physics   Check publisher's open access policy
ISSN 1475-7516
Publication date 2011-07
Sub-type Article (original research)
DOI 10.1088/1475-7516/2011/07/037
Volume 2011
Issue 7
Start page 1
End page 22
Total pages 22
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Collection year 2012
Language eng
Formatted abstract
We constrain the evolution of Newton’s constant using the growth rate of largescale structure measured by the WiggleZ Dark Energy Survey in the redshift range 0.1 < z < 0.9. We use this data in two ways. Firstly we constrain the matter density of the Universe, Ωm (assuming General Relativity), and use this to construct a diagnostic to detect the presence of an evolving Newton’s constant. Secondly we directly measure the evolution of Newton’s constant, Geff, that appears in Modified Gravity theories, without assuming General Relativity to be true. The novelty of these approaches are that, contrary to other methods, they do not require knowledge of the expansion history of the Universe, H(z), making them model independent tests. Our constraints for the second derivative of Newton’s constant at the present day, assuming it is slowly evolving as suggested by Big Bang Nucleosynthesis constraints, using the WiggleZ data is G¨eff(t0) = −1.19 ± 0.95 • 10−20 h2 yr−2, where h is defined via H0 = 100 h km s−1 Mpc−1, while using both the WiggleZ and the Sloan Digital Sky Survey Luminous Red Galaxy (SDSS LRG) data is G¨eff(t0) = −3.6 ± 6.8 • 10−21 h2 yr−2, both being consistent with General Relativity. Finally, our constraint for the rms mass fluctuation σ8 using the WiggleZ data is σ8 = 0.75 ± 0.08, while using both the WiggleZ and the SDSS LRG data σ8 = 0.77 ± 0.07, both in good agreement with the latest measurements from the Cosmic Microwave Background radiation. 
Keyword Modified gravity
Dark energy experiments
Dark energy theory
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2012 Collection
 
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