Prospects for Solving Baryonic Feedback in Weak Lensing using FRBs

Speaker: Calvin Leung (UC Berkeley) In Person and zoom

Zoom info: https://stanford.zoom.us/my/sihanyuan?pwd=QnpsUHZWWGJ2ekVYWmZVL3BmM0gzZ…

The nascent generation of cosmological surveys like LSST and Euclid will be limited by our understanding of galaxy formation, AGN feedback, and their coupling to the diffuse, baryonic universe and weak lensing measurements. Meanwhile, fast radio bursts (FRBs) are millisecond duration radio transients which, despite their mysterious origin, are sensitive probes of the diffuse, ionized gas in and around galaxies. I will discuss early observational progress in FRB science using CHIME Outriggers - a newly completed VLBI array which boasts the highest FRB detection rate and ~0.1” localization accuracy. I will then demonstrate how FRBs from CHIME can constrain the degree of suppression of the matter power spectrum due to baryonic feedback in the local universe, making them complementary to other probes of diffuse gas. In addition, I will outline a novel technique for “nulling” the impact of baryons on large scale structure which can be applied to data from the next generation of FRB surveys such as CHORD and the DSA-2000.