Séminaire Univers /
Seminar Universe

On large scales, peculiar velocities encode rich cosmological information. While the line-of-sight components are routinely analysed through redshift-space distortions and the kinetic Sunyaev-Zel’dovich effect, measurement of transverse velocities has remained challenging. I will present a detection of gravitational dipoles aligned with transverse velocities on scales of tens of degrees on the sky, traced through their imprints on the Cosmic Microwave Background via the effects of integrated Sachs-Wolfe and CMB lensing. I will show how this can be used to study cosmology and test general relativity.

 

Related work: https://arxiv.org/pdf/2504.02525