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Pseudoscalar sterile neutrino self-interactions in light of Planck, SPT and ACT data

Gariazzo, Stefano; Archidiacono, Maria; Hannestad, Steen +4 more

We reassess the viability of a cosmological model including a fourth additional sterile neutrino species that self-interacts through a new pseudoscalar degree of freedom. We perform a series of extensive analyses fitting various combinations of cosmic microwave background (CMB) data from Planck, the Atacama Cosmology Telescope (ACT) and the South …