A cosmological exclusion plot: towards model-independent constraints on modified gravity from current and future growth rate data

  title={A cosmological exclusion plot: towards model-independent constraints on modified gravity from current and future growth rate data},
  author={Laura Taddei and Luca Amendola},
  journal={Journal of Cosmology and Astroparticle Physics},
  pages={001 - 001}
Most cosmological constraints on modified gravity are obtained assuming that the cosmic evolution was standard ΛCDM in the past and that the present matter density and power spectrum normalization are the same as in a ΛCDM model. Here we examine how the constraints change when these assumptions are lifted. We focus in particular on the parameter Y (also called Geff) that quantifies the deviation from the Poisson equation. This parameter can be estimated by comparing with the model-independent… 

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