Speaker
Description
The accelerated expansion of the Universe remains one of the central open problems in cosmology. While traditional probes such as the Cosmic Microwave Background, Type Ia Supernovae, and Baryon Acoustic Oscillations have enabled precision cosmology, persistent tensions between independent measurements highlight the need for complementary observables to validate existing results and address systematic effects.
In this work, we explore the cosmological potential of combining angular density fluctuations and angular redshift fluctuations to probe large-scale structure and cosmic dynamics. We analyze their angular power spectra over a wide range of scales and show that angular redshift fluctuations carry particularly valuable information on small scales, where they directly trace the dynamics of cosmic voids. Cosmic voids provide a promising laboratory for these studies due to their reduced sensitivity to nonlinear effects and their enhanced response to modified gravity models.