Browsing Faculty of Natural Sciences by Subject "Modified gravity"

Now showing items 1-5 of 5

    • Constraining the growth rate by combining multiple future surveys 

      Viljoen, Jan-Albert; Fonseca, Jos´e; Maartens, Roy (IOP Publishing, 2020)
      The growth rate of large-scale structure provides a powerful consistency test of the standard cosmological model and a probe of possible deviations from general relativity. We use a Fisher analysis to forecast constraints ...

    • Hybrid P` (k): General, unified, non-linear matter power spectrum in redshift space 

      Pourtsidou, Alkistis; Bose, Benjamin; Winther, Hans A. (IOP Publishing Ltd, 2020)
      Constraints on gravity and cosmology will greatly benefit from performing joint clustering and weak lensing analyses on large-scale structure data sets. Utilising non-linear information coming from small physical scales ...

    • Model-independent constraints on dark energy and modified gravity with the SKA 

      Zhao, Gong-Bo; Bacon, David; Maartens, Roy; Santos, Mario G.; Raccanelli, Alvise (Proceedings of Science, 2014)
      Employing a nonparametric approach of the principal component analysis (PCA), we forecast the future constraint on the equation of state w(z) of dark energy, and on the effective Newton constant m(k; z), which parameterise ...

    • Probing beyond-Horndeski gravity on ultra-large scales 

      Duniya, Didam G.A.; Moloi, Teboho; Clarkson, Chris (IOP Publishing Ltd, 2020)
      The beyond-Horndeski gravity has recently been reformulated in the dark energy paradigm — which has been dubbed, Unified Dark Energy (UDE). The evolution equations for the given UDE appear to correspond to a non-conservative ...

    • Scalar-tensor theories of gravity, neutrino physics, and the H0 tension 

      Ballardini, Mario; Braglia, Matteo; Finelli, Fabio (IOP Publishing, 2020)
      We use Planck 2018 data to constrain the simplest models of scalar-tensor theories characterized by a coupling to the Ricci scalar of the type F(σ)R with F(σ) = N2 pl + ξσ2 . We update our results with previous Planck ...