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

• Main Authors: Corona, Mattia Atzori, Murgia, Riccardo, Cadeddu, Matteo, Archidiacono, Maria, Gariazzo, Stefano, Giunti, Carlo, Hannestad, Steen
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: arXiv 2021
• Subjects: Cosmology and Nongalactic Astrophysics astro-ph.CO; High Energy Physics - Phenomenology hep-ph; FOS Physical sciences; South Pole; Hubble; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.2112.00037; https://arxiv.org/abs/2112.00037

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. To that end, we perform a series of extensive analyses fitting various combinations of cosmic microwave background (CMB) data fro...