Sesh tells us how the void-galaxy cross correlation provides information about cosmology via redshift space distortions and (importantly) the Alcock Paczynski effect. The information is independent of Baryon Acoustic Oscillations (BAO) and improves error bars by up to a factor of four. The combination of voids and BAO have very interesting insights into the Hubble discrepancy and the late-time acceleration of the Universe.

Speaker: Seshadri Nadathur

(the most relevant) Papers: https://arxiv.org/abs/2001.11044​ and https://arxiv.org/abs/1904.01030