Cluster-Void Degeneracy Breaking: Modified Gravity in the Balance
Abstract
Combining galaxy cluster and void abundances is a novel, powerful way to constrain deviations from General Relativity and the model. For a flat wCDM model with growth of large-scale structure parameterized by the redshift-dependent growth index γ(z) = γ0 + γ1 z/(1+z) of linear matter perturbations, combining void and cluster abundances in future surveys with Euclid and the 4-metre Multi-Object Spectroscopic Telescope (4MOST) could improve the Figure of Merit for (w, γ0, γ1) by a factor of 20 compared to individual abundances. In an ideal case, improvement on current cosmological data is a Figure of Merit factor 600 or more.
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