Cosmological constraints on the neutrino mass including systematic uncertainties

Understand

When combining cosmological and oscillations results to constrain the neutrino sector, the question of the propagation of systematic uncertainties is often raised.

• We address this issue in the context of the derivation of an upper bound on the sum of the neutrino masses ($\Sigma m_\nu$) with recent cosmological data.
• This work is performed within the ${{\mathrm{\Lambda{CDM}}}}$ model extended to $\Sigma m_\nu$, for which we advocate the use of three mass-degenerate neutrinos.
• We focus on the study of systematic uncertainties linked to the foregrounds modelling in CMB data analysis, and on the impact of the present knowledge of the reionisation optical depth.