The perspective of voids on rising cosmology tensions
Sofia Contarini (MPE-Garching)
Tuesday 21/11/2023 @ 14:00, Sala Antonio Sollima (IV piano Battiferro)
Observing the Universe at large scales, a considerable fraction of its volume is dominated by almost empty space. Alongside the luminous filamentary structures of the Universe, there are vast underdense zones commonly known as cosmic voids. Although essentially devoid of matter, voids enclose fundamental information about the cosmological framework. In this talk I will present the first cosmological constraints derived from the analysis of the void size function, i.e. the number of cosmic voids as a function of their radius. These results are obtained from the modelling of voids identified in the final BOSS DR12 data set, adopting a state-of-the-art methodology to take into account a number of observational effects. I will showcase the constraining power achieved on the main parameters of the LambdaCDM and the wCDM models. This includes the first estimate of the parameters H_0 and S_8 derived from cosmic voids, providing new insights on the rising tensions in Cosmology.