Cosmic Structure SIG Seminar

Prospects for Solving Baryonic Feedback in Weak Lensing using FRBs

Speaker

Calvin Leung (Berkeley)

Abstract

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 give an introduction to FRBs and CHIME/FRB Outriggers - a newly-completed radio telescope which boasts the highest FRB detection rate and 50 milli-arcsecond 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 like the kSZ effect and cosmic shear. In addition, I will outline a novel technique for “nulling” the impact of baryonic feedback on the matter spectrum by combining the next generation of FRBs and cosmic shear measurements.

Meeting Connection

CoS SIG | Meeting-Join | Microsoft Teams

News Straight to Your Inbox

Subscribe to your community email news list

We will never share your email address.

Privacy Policy

Sign Up