CMB anisotropies from patchy reionisation and diffuse Sunyaev-Zel'dovich effects

Understand

Anisotropies in the Cosmic Microwave Background (CMB) can be induced during the later stages of cosmic evolution, and in particular during and after the Epoch of Reionisation.

• Inhomogeneities in the ionised fraction, but also in the baryon density, in the velocity fields and in the gravitational potentials are expected to generate correlated CMB perturbations.
• We present a complete relativistic treatment of all these effects, up to second order in perturbation theory, that we solve using the numerical Boltzmann code SONG.
• The physical origin and relevance of all second order terms are carefully discussed.