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Something from nothing: Cosmic voids as CMB lenses

Speaker

Pauline Vielzeuf
CPPM, Marseille (Marseille, France)

Abstract

In the era of large scale galaxy observation campaigns, cosmic voids, defined as the large underdense regions of the cosmic web surrounded by galaxies, galaxy clusters and filaments, are becoming an attractive alternative tracer to probe cosmological models. Indeed, due to their low dense environment, cosmic voids have shown to be particularly sensitive to gravity modifications which make them special objects to probe deviation from the standard cosmological model. Moreover, correlations between the observed Cosmic Microwave Background (CMB) radiation and large scale structure of our universe is probing the growth of structures in the low-redshift cosmic web and have recently been added as a new tool in our cosmological inference. The CMB correlation signal with cosmic voids as been already observed using data from different galaxy surveys and with different CMB observables. After introducing cosmic voids and they current general use in cosmological analysis, I will present the methodology and recent results that have lead to the higher detection to date of cosmic voids imprints in CMB maps as well as a parallel analysis aiming to predict the effect of massive neutrinos in such signal.

Date and Time

November 23 2023
4pm KST (= 7am UTC)

Zoom link (active once the seminar starts)

Recording

Link to the recording on YouTube