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Journal Articles Physical Review D Year : 2015

Cosmological tests of modified gravity: constraints on $F(R)$ theories from the galaxy clustering ratio

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Julien Bel
  • Function : Author
  • PersonId : 752966
  • IdHAL : julien-bel
Philippe Brax
  • Function : Author
  • PersonId : 830764
Patrick Valageas
  • Function : Author
  • PersonId : 834493

Abstract

The clustering ratio $\eta$, a large-scale structure observable originally devised to constrain the shape of the power spectrum of matter density fluctuations, is shown to provide a sensitive and model independent probe of the nature of gravity in the cosmological regime. We apply this analysis to $F(R)$ theories of gravity using the luminous red galaxy sample extracted from the Sloan Digital Sky Survey. We find that the absolute amplitude of deviations from GR, $f_{R_0 }$, is constrained to be smaller than $3 \times 10^{-6}$ at the 1$\sigma$ confidence level. This bound, improving by an order of magnitude on current constraints, makes cosmological probes of gravity competitive with Solar system tests.

Dates and versions

cea-01068693 , version 1 (26-09-2014)

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Julien Bel, Philippe Brax, Christian Marinoni, Patrick Valageas. Cosmological tests of modified gravity: constraints on $F(R)$ theories from the galaxy clustering ratio. Physical Review D, 2015, 91 (10), pp.103503. ⟨10.1103/PhysRevD.91.103503⟩. ⟨cea-01068693⟩
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