Bounds on Light Sterile Neutrinos from Cosmology and Laboratory

Abstract: I will present new constraints on sterile neutrino properties obtained from both cosmological and direct measurements. For the first time, we model the sterile in a full 3+1 framework coupled via oscillations to all other neutrino flavours and consistently calculate the abundance and cosmological perturbations. CMB data dominates the resulting limits on mass splitting and the mixing matrix elements. In addition, we translate the cosmological bounds to the mass parameters directly probed by laboratory searches and obtain the strongest currently available limits. I will also show that various hints of eV-scale sterile neutrinos from short-baseline oscillation experiments are in severe tension with our cosmological constraints.

Video of Talk: https://www.youtube.com/watch?v=EDaNnS_QpvY

Paper: [2003.02289] Bounds on light sterile neutrino mass and mixing from cosmology and laboratory searches, by Steffen Hagstotz, Pablo F. de Salas, Stefano Gariazzo, Martina Gerbino, Massimiliano Lattanzi, Sunny Vagnozzi, Katherine Freese, Sergio Pastor

cosmology and nongalactic astrophysicsgeneral relativity and quantum cosmology

Audience: advanced learners

( paper | slides | video )

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CosmoConβ - Cosmology from Home

Series comments: Cosmology from Home is an online cosmology conference. One of its features are pre-recorded talks, publicly available at its YouTube channel.

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