Sterile neutrinos

Abstract

Neutrino masses are usually described by adding to the Standard Model some SU(2)-singlet fermions that have the Yukawa couplings, as well as some Majorana mass terms. The number of such fields and the scales of their Majorana masses are not known. Several independent observations point to the possibility that some of these singlets may have masses well below the electroweak scale. A sterile neutrino with mass of a few keV can account for cosmological dark matter. The same particle would be emitted anisotropically from a cooling neutron star born in a supernova explosion. This anisotropy can be large enough to explain the observed velocities of pulsars. A lighter sterile neutrino, with mass of the order of eV, is implied by the LSND results; it can have profound implications for cosmology. We review the physics of sterile neutrinos and the roles they may play in astrophysics and cosmology.

11 pages, 1 figure; invited talk at the "12th Mexican School on particles and fields" and the "6th Latin American Symposium on high energy physics" (VI-Silafae/XII-MSPF)

Cited by in corpus (30)

• First results from DAMA/LIBRA and the combined results with DAMA/NaI
• The Search for Heavy Majorana Neutrinos
• A facility to Search for Hidden Particles at the CERN SPS: the SHiP physics case
• The DAMA/LIBRA apparatus
• Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos
• A lower bound on the mass of Dark Matter particles
• New Production Mechanism for keV Sterile Neutrino Dark Matter by Decays of Frozen-In Scalars
• Constraints on dark matter particles from theory, galaxy observations and N-body simulations
• Experimental bounds on sterile neutrino mixing angles
• Clustering properties of a sterile neutrino dark matter candidate
• Small scale aspects of warm dark matter : power spectra and acoustic oscillations
• Dodelson-Widrow Production of Sterile Neutrino Dark Matter with Non-Trivial Initial Abundance
• Signatures of heavy sterile neutrinos at long baseline experiments
• The dark matter transfer function: free streaming, particle statistics and memory of gravitational clustering
• Free streaming in mixed dark matter
• Polynomial Inflation and Dark Matter
• Searching for sterile neutrinos from $\pi$ and $K$ decays
• Non-minimally Coupled Vector Boson Dark Matter
• Two radiative inverse seesaw models, dark matter, and baryogenesis
• Production of a sterile species via active-sterile mixing: an exactly solvable model
• Consequences of a Pati-Salam unification of the electroweak-scale active ${\nu }_R$ model
• Effects of an Intermediate Mass Sterile Neutrino Population on the Early Universe
• Dark Matter abundance via thermal decays and leptoquark mediators
• Scalar induced resonant sterile neutrino production in the early Universe
• Unsterile-Active Neutrino Mixing: Consequences on Radiative Decay and Bounds from the X-ray Background
• Neutrinos in Astrophysics and Cosmology: Theoretical Advanced Study Institute (TASI) 2020 Lectures
• Mass Varying Neutrinos in Supernovae
• Low Scale Leptogenesis from Non-Leptonic CP-Phases
• Cosmological constraints on sterile neutrino Dark Matter production mechanisms
• Production of a sterile species: quantum kinetics