Enabling kSZ cosmology using Fast Radio Bursts

27 mai 2021, 17:30
40m

Orateur

Prof. Mathew Madhavacheril (Perimeter Institute for Theoretical Physics)

Description

Sub-percent precision measurements of the kSZ effect -- small-scale anisotropies in the CMB due to scattering off clouds of moving ionized gas -- will be possible with upcoming CMB and galaxy surveys, so it is timely to ask what science can be extracted with such measurements. I will discuss how recasting kSZ tomography as a bispectrum measurement allows for a unified framework under which the "galaxy optical depth degeneracy" problem becomes clear; the cosmic velocity field and an astrophysical power spectrum involving the electron density appear together. However, these are degenerate only up to an overall amplitude. I will also discuss a way to break the optical depth degeneracy using the dispersion measures of fast radio bursts (FRBs) allowing for strong constraints on the growth of cosmic structure.

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