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SUMMARY:Cosmological applications of the kSZ effect - Mat Madhavacheril\, 
 Perimeter
DTSTART:20200601T120000Z
DTEND:20200601T130000Z
UID:TALK141433@talks.cam.ac.uk
CONTACT:David Stefanyszyn
DESCRIPTION:Percent level measurements of the kSZ effect (due to bulk moti
 on of free electrons) will be possible with upcoming CMB and galaxy survey
 s\, so it is timely to ask what science can be extracted with such measure
 ments.  I will discuss how recasting kSZ tomography as a bispectrum measur
 ement allows for a unified framework under which the "galaxy optical depth
  degeneracy" problem becomes clear\;  the cosmic velocity field and an ast
 rophysical power spectrum involving the electron density appear together. 
 However\, these are degenerate only up to an overall amplitude. I discuss 
 how scale-dependent effects like those due to primordial non-Gaussianity o
 r dark energy perturbations can be constrained with kSZ (with factors of >
 2x improvement on fNL possible with future surveys). I will also discuss a
  way to break the optical depth degeneracy using the dispersion measures o
 f fast radio bursts (FRBs) allowing for strong constraints on sigma8. Fina
 lly\, I discuss calibration of baryonic feedback in weak lensing measureme
 nts using kSZ measurements of the electron density profile.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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