# Cluster-Void Degeneracy Breaking: Modified Gravity in the Balance

@article{Sahlen2018ClusterVoidDB,
title={Cluster-Void Degeneracy Breaking: Modified Gravity in the Balance},
author={Martin Sahl'en and Joseph I. Silk},
journal={Physical Review D},
year={2018},
volume={97},
pages={103504}
}
• Published 20 December 2016
• Physics
• Physical Review D
Combining galaxy cluster and void abundances is a novel, powerful way to constrain deviations from General Relativity and the $\Lambda$CDM model. For a flat $w$CDM model with growth of large-scale structure parameterized by the redshift-dependent growth index $\gamma(z) = \gamma_0 + \gamma_1 z/(1+z)$ 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…

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