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The Short BaseLine (SBL) neutrino oscillations anomalies hint at the presenceof a sterile neutrino with a mass of around 1 eV. However, such neutrino ishighly incompatible with the cosmological data, in particular from the CosmicMicrowave Background (CMB), if no new physics is assumed. An interestingpossibility for reconciling the 1 eV sterile neutrino presence in cosmology isrelated to the existence of a new pseudoscalar interaction. If the sterileneutrinos experience such a pseudoscalar interaction, the cosmological analysesof the full CMB data prefer a sterile neutrino mass that is fully compatiblewith the SBL determinations. The additional interaction allows to obtain alsoan improved compatibility of the cosmological predictions with the localmeasurements of the Hubble parameter.

Light sterile neutrinos and pseudoscalar interactions in cosmology