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SUMMARY:Efficient Method for Galaxy Analysis - Hayden Lee\, Harvard
DTSTART:20201130T130000Z
DTEND:20201130T140000Z
UID:TALK153106@talks.cam.ac.uk
CONTACT:David Stefanyszyn
DESCRIPTION:Cosmological observables such as galaxy statistics are mapped 
 in terms of angular positions on the sky and redshifts. While the traditio
 nal Fourier analysis has been widely used for small survey volumes\, near-
 future galaxy surveys will map galaxies at wider angles and deeper in reds
 hift\, necessitating a full-sky formalism for analyzing angular correlatio
 ns of galaxies. However\, data analysis in angular space has so far proved
  challenging due to the numerical difficulty of evaluating 2D projection i
 ntegrals. In this talk\, I will describe a new efficient method for comput
 ing cosmological angular correlations that bypasses this difficulty. This 
 approach does not only accelerate the computation of galaxy angular power 
 spectra\, but also that of bispectra and trispectra relevant for constrain
 ing primordial non-Gaussianity. A particularly interesting application is 
 to study the cross-correlations between galaxies and the CMB lensing—I w
 ill present forecasted constraints on cosmological parameters based on the
  new technique.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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