Optimizing future imaging survey of galaxies to confront dark energy and modified gravity models

K. Yamamoto, D. Parkinson, T. Hamana, Bob Nichol, Y. Suto

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Abstract

We consider the extent to which future imaging surveys of galaxies can distinguish between dark energy and modified gravity models for the origin of the cosmic acceleration. Dynamical dark energy models may have similar expansion rates as models of modified gravity, yet predict different growth of structure histories. We parametrize the cosmic expansion by the two parameters, w0 and wa, and the linear growth rate of density fluctuations by Linder’s γ, independently. Dark energy models generically predict γ≈0.55, while the Dvali-Gabadadze-Porrati (DGP) model γ≈0.68. To determine if future imaging surveys can constrain γ within 20% (or Δγ
Original languageEnglish
Pages (from-to)023504
Number of pages1
JournalPhysical Review D
Volume76
Issue number2
DOIs
Publication statusPublished - 2007

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