XIIIth School of Cosmology
November 12 - 18, 2017IESC, Cargèse
The CMB from A to Z
promises and challenges of the CMB as a cosmological probe

CMB Angular Power Spectra and their Likelihoods:  in Theory and  in Practice

Institut d’Astrophysique de Paris


  1. Power spectra and Likelihood
    1. motivation: a path to cosmology
    2. ideal and actual calculations
  2. Application to real life data
    1. short cuts and approximations
    2. foregrounds, noises and systematic effects
    3. data splits and consistency tests


I will review the motivation behind the calculation of the CMB angular power spectra, how it should be done, and how it is actually feasible. Using the Planck experience I will then show some of the problems affecting  the high signal to noise regime expected in future experiments, such as the residual noises and foregrounds, the instrument and analysis related systematics effects, and the required consistency tests.


  • Articles
    • Efstathiou 2004 2004MNRAS.349..603E
    • Planck 2015-XI, 2016 2016A&A…594A..11P