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In light of the improved sensitivities of cosmological observations, weexamine the status of quasi-degenerate neutrino mass scenarios. Within thesimplest extension of the standard cosmological model with massive neutrinos,we find that quasi-degenerate neutrinos are severely constrained by presentcosmological data and neutrino oscillation experiments. % % We find that Planck2018 observations of cosmic microwave background (CMB) anisotropies disfavourquasi-degenerate neutrino masses at $2.4$ Gaussian $\sigma$'s, while addingBaryon acoustic oscillations (BAO) data brings the rejection to 5.9$\sigma$'s.% The highest statistical significance with which one would be able to rule outquasi-degeneracy would arise if the sum of neutrino masses is $\Sigma m_\nu =60$ \meV (the minimum allowed by neutrino oscillation experiments); % indeed asensitivity of 15 meV, as expected from a combination of future cosmologicalprobes, would further improve the rejection level up to 17$\sigma$. % Wediscuss the robustness of these projections with respect to assumptions on theunderlying cosmological model, and also compare them with bounds from $\beta$decay endpoint and neutrinoless double beta decay studies.

Cornering (quasi) degenerate neutrinos with cosmology