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 $\Lambda$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 for ($w,{\gamma }_0,{\gamma }_1$) 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.

9 pages, 3 figures, 4 tables. Matches published version. Added redshift-dependent growth index, significantly extended discussion on void sensitivity to cosmological parameters. Basic conclusions unchanged

References in corpus (5)

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• Dark matter voids in the SDSS galaxy survey
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Cited by in corpus (15)

• Cosmic voids in modified gravity models with massive neutrinos
• The GIGANTES dataset: precision cosmology from voids in the machine learning era
• Euclid: Forecasts from redshift-space distortions and the Alcock-Paczynski test with cosmic voids
• Cosmological exploitation of the size function of cosmic voids identified in the distribution of biased tracers
• Euclid: Cosmological forecasts from the void size function
• Cosmological constraints from the BOSS DR12 void size function
• Cosmic voids: a novel probe to shed light on our Universe
• Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function
• Cluster-void degeneracy breaking: Neutrino properties and dark energy
• DEMNUni: disentangling dark energy from massive neutrinos with the void size function
• The halo bias inside cosmic voids
• A study on Cubic Galileon Gravity Using N-body Simulations
• Non-comoving baryons and cold dark matter in cosmic voids
• Unveiling the Universe with Emerging Cosmological Probes
• Cosmology with Cosmic Voids