Speaker
Description
As underdense regions in the universe, cosmic voids are less affected by non-linear gravitational evolution and baryonic feedback, providing a clean environment for constraining cosmological parameters. In particular, the void density profile is sensitive to cosmology, but remains challenging to measure in observations. In this work, we investigate the method to constrain the void density profile with weak lensing effect, and assess its potential for further cosmological constraints, based on mocks from N-body simulations. As a case study, our result indicates that void lensing provides an independent constraint on neutrino mass as $M_{\nu} < 0.64\ eV$ (95% CL), under observational conditions similar to current surveys. We further study how combining void lensing with other cosmological probes can help to break parameter degeneracies and make forecasts for next-generation surveys. This method serves as an important synergy between spectroscopic and imaging surveys.
