Exploring the cosmological synergy between galaxy cluster and cosmic void number counts

Abstract

Galaxy clusters and cosmic voids, the most extreme objects of our Universe in terms of mass and size, trace two opposite sides of the large-scale matter density field. By studying their abundance as a function of their mass and radius, respectively, i.e. the halo mass function (HMF) and void size function (VSF), it is possible to achieve fundamental constraints on the cosmological model. While the HMF has already been extensively exploited providing robust constraints on the main cosmological model parameters (e.g. ${\Omega }_{\mathrm{m}}$, ${\sigma }_8$ and $S_8$), the VSF is still emerging as a viable and effective cosmological probe. Given the expected complementarity of these statistics, in this work we aim at estimating the costraining power deriving from their combination. To this end, we exploit realistic mock samples of galaxy clusters and voids extracted from state-of-the-art large hydrodynamical simulations, in the redshift range $0.2\le z\le 1$. We perform an accurate calibration of the free parameters of the HMF and VSF models, needed to take into account the differences between the types of mass tracers used in this work and those considered in previous literature analyses. Then, we obtain constraints on ${\Omega }_{\mathrm{m}}$ and ${\sigma }_8$ by performing a Bayesian analysis. We find that cluster and void counts represent powerful independent and complementary probes to test the cosmological framework. In particular, the constraining power of the HMF on ${\Omega }_{\mathrm{m}}$ and ${\sigma }_8$ improves drastically with the VSF contribution, increasing the $S_8$ constraint precision by a factor of about 60%.

14 pages, 8 figures - published in MNRAS

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• The perspective of voids on rising cosmology tensions
• DEMNUni: disentangling dark energy from massive neutrinos with the void size function
• Guess the cheese flavour by the size of its holes: A cosmological test using the abundance of Popcorn voids
• Future Cosmology: New Physics and Opportunity from the China Space Station Telescope (CSST)
• Machine-learning cosmology from void properties
• Cosmology from one galaxy in a void?
• Weak-lensing tunnel voids in simulated light cones: A new pipeline to investigate modified gravity and massive neutrinos signatures
• Cosmological Inference with Cosmic Voids and Neural Network Emulators
• Cosmology with voids from the Nancy Grace Roman Space Telescope
• Cosmology with Cosmic Voids
• A revisited Correction to the Halo Mass Function for local-type Primordial non-Gaussianity