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Title: Constraining models of f(R) gravity with Planck and WiggleZ power spectrum data

In order to explain cosmic acceleration without invoking ''dark'' physics, we consider f(R) modified gravity models, which replace the standard Einstein-Hilbert action in General Relativity with a higher derivative theory. We use data from the WiggleZ Dark Energy survey to probe the formation of structure on large scales which can place tight constraints on these models. We combine the large-scale structure data with measurements of the cosmic microwave background from the Planck surveyor. After parameterizing the modification of the action using the Compton wavelength parameter B{sub 0}, we constrain this parameter using ISiTGR, assuming an initial non-informative log prior probability distribution of this cross-over scale. We find that the addition of the WiggleZ power spectrum provides the tightest constraints to date on B{sub 0} by an order of magnitude, giving log{sub 10}(B{sub 0}) < −4.07 at 95% confidence limit. Finally, we test whether the effect of adding the lensing amplitude A{sub Lens} and the sum of the neutrino mass ∑m{sub ν} is able to reconcile current tensions present in these parameters, but find f(R) gravity an inadequate explanation.
Authors:
;  [1] ;  [2]
  1. School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072 (Australia)
  2. Institute Lorentz, Leiden University, PO Box 9506, Leiden 2300 RA (Netherlands)
Publication Date:
OSTI Identifier:
22370609
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; AMPLITUDES; COMPTON WAVELENGTH; GENERAL RELATIVITY THEORY; GRAVITATION; LIMITING VALUES; MARINE SURVEYS; MASS; MODIFICATIONS; NEUTRINOS; NONLUMINOUS MATTER; PROBABILITY; PUBLIC OPINION; RELICT RADIATION; SPECTRA