Modern surveys allow us to access to high quality measurements on large areas in the sky and at high redshift - thus sampling the galaxy distribution in detail also in the emptier regions, voids. Void cosmology is hence becoming an increasingly active sector of galaxy clustering analysis: by measuring void properties, such as the abundance or the density profiles, it is possible to constrain cosmological parameters. The void perspective is particularly promising to better understand dark energy: voids being by definition devoid of matter, their dominant component is dark energy and the effects of this component are expected to be more evident on voids. However another possibility to justify current observations is to consider a modification of the laws of General Relativity. Cosmic voids constitute a sweet spot where the effects of modifications of General Relativity would be more prominent.In this talk I briefly illustrate the use of cosmic voids as a tool for cosmology, I present recent developments on the field and discuss on the constraining power of voids that will be observed by upcoming surveys such as the NASA's Wide Field Infrared Survey Telescope (WFIRST) and the ESA's Euclid space mission.
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018