Angular power spectra for 3x2pt cosmology

10 Jun 2025
Seminars and colloquia
Time
Venue
Beecroft Seminar Room
Denys Wilkinson Building, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH
Speaker(s)

Nicolas Tessore, UCL

Seminar series
Cosmology

Abstract

In new cosmological galaxy surveys like Euclid and LSST, the workhorse probe of dark energy are the “3x2pt” statistics of galaxy clustering, cosmic shear, and their cross-combination. I present recent work on adapting angular power spectra to the challenges of 3x2pt measurements under the stringent statistical requirements of these surveys. This includes new methods for measuring spectra from discrete observations, the treatment of shot noise, covariance estimation, and the estimation of full-sky spectra from partial-sky observations.