Precision cosmology with cosmic voids

Alice Pisani (1, 2)

1 CPPM - Centre de Physique des Particules de Marseille
2 IAP - Institut d'Astrophysique de Paris

Cosmic voids, the emptiest regions of the universe are a promising tool to constrain cosmological models. In this paper I introduce the use of voids for cosmology and focus on one of the main systematic effects undermining the optimal extraction of cosmological information from the under-dense regions: peculiar velocities. I present guidelines reduce the impact of peculiar velocities by performing optimal cuts on void catalogues. Additionally I discuss the considerable increase in void statistics to be expected from future surveys and present an estimate of the number of voids to be obtained from two upcoming surveys: the ESA-lead Euclid survey and the NASA-lead WFIRST mission.

Mots clés: Large scale structure

Domaines: Relativité Générale et Cosmologie Quantique [gr-qc]

Alice Pisani. Precision cosmology with cosmic voids. 14th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories, Jul 2015, Rome, Italy. pp.2317-2322, ⟨10.1142/9789813226609_0268⟩. ⟨hal-01669853⟩