Speaker
Yan-Chuan Cai
(University of Edinburgh)
Description
On large scales, peculiar velocities encode a wealth of cosmological information. While line-of-sight components are routinely probed through redshift-space distortions and the kinetic Sunyaev–Zel’dovich effect, measuring transverse velocities has remained challenging. I will present a detection of dipolar patterns on angular scales of tens of degrees imprinted on the Cosmic Microwave Background through the integrated Sachs–Wolfe effect and gravitational lensing. These dipoles are aligned with large-scale transverse velocities and therefore provide a handle to extract cosmological information from them. I will discuss how such measurements can be used to constrain cosmological parameters and test general relativity.
Author
Yan-Chuan Cai
(University of Edinburgh)