CMB at small scales: Cosmology from tSZ power spectrum

Understand

Small scale CMB angular power spectrum contains not only primordial CMB information but also many contaminants coming from secondary anisotropies.

• Most of the latter depend on the cosmological model but are often marginalised over.
• We propose a new analysis of the SPT data focusing on the cosmological contribution of the thermal Sunyaev Zel'dovich (tSZ) effect.
• We model the tSZ angular spectrum with the halo model and train a random forest algorithm to speed up its computation.