Cosmic voids as cosmological laboratories

Modern spectroscopic surveys are mapping the Universe in an unprecedented way. In view of this, cosmic voids constitute promising cosmological laboratories. There are two primary statistics in void studies: (i) the void size function, which quantifies their abundance, and (ii) the void-galaxy cross-correlation function, which characterises the density and velocity fields in their surroundings. Nevertheless, in order to design reliable cosmological tests based on these statistics, it is necessary a complete description of the effects of geometrical (Alcock-Paczynski effect) and dynamical (Kaiser effect) distortions. Observational measurements show prominent anisotropic patterns that lead to biased cosmological constraints if they are not properly modelled. I will present a theoretical framework to address this problematic based on a cosmological and dynamical analysis of the mapping of voids between real and redshift space. In addition, I will present a new fiducial-free cosmological test based on two perpendicular projections of the correlation function which allows us to effectively break degeneracies in the model parameter space and to significantly reduce the number of mock catalogues needed to estimate covariances.