Constraining models for keV sterile neutrinos by quasi-degenerate active neutrinos

Abstract

We present a No-Go theorem for keV sterile neutrino Dark Matter: if sterile neutrinos at the keV scale play the role of Dark Matter, they are typically unstable and their decay produces an astrophysical monoenergetic X-ray line. It turns out that the observational bound on this line is so strong that it contradicts the existence of a quasi-degenerate spectrum of active neutrinos in a seesaw type I framework where the Casas-Ibarra matrix R is real. This is the case in particular for models without CP violation. We give a general proof of this theorem. While the theorem (like every No-Go theorem) relies on certain assumptions, the situation under which it applies is still sufficiently general to lead to interesting consequences for keV neutrino model building. In fact, depending on the outcome of the next generation experiments, one might be able to rule out whole classes of models for keV sterile neutrinos.

arXiv comment14 pages, 1 figure; v.3: error in the compilation of the file corrected (some references did not show properly); Special thanks to D. Boedecker for pointing out that issue to me!

References in corpus (66)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Sterile Neutrinos as Dark Matter
• Oscillating neutrinos and mu --> e, gamma
• Halo Formation in Warm Dark Matter Models
• The $\nu$MSM, Dark Matter and Neutrino Masses
• A New Dark Matter Candidate: Non-thermal Sterile Neutrinos
• Final Results from phase II of the Mainz Neutrino Mass Search in Tritium $\beta$ Decay
• The role of sterile neutrinos in cosmology and astrophysics
• Global analysis of neutrino masses, mixings and phases: entering the era of leptonic CP violation searches
• Latest Results from the Heidelberg-Moscow Double Beta Decay Experiment
• Global status of neutrino oscillation parameters after Neutrino-2012
• The haloes of bright satellite galaxies in a warm dark matter universe
• Massive sterile neutrinos as warm Dark Matter
• Lyman-alpha constraints on warm and on warm-plus-cold dark matter models
• The $\nu$MSM, Inflation, and Dark Matter
• Unitarity of the Leptonic Mixing Matrix
• Direct Detection of Warm Dark Matter in the X-ray
• A possible symmetry of the $\nu$MSM
• Lightest sterile neutrino abundance within the nuMSM
• A lower bound on the mass of Dark Matter particles
• 130Te Neutrinoless Double-Beta Decay with CUORICINO
• Opening a new window for warm dark matter
• keV sterile neutrino dark matter in gauge extensions of the standard model
• Sterile neutrino dark matter as a consequence of nuMSM-induced lepton asymmetry
• Constraints on sterile neutrino as a dark matter candidate from the diffuse X-ray background
• Light Sterile Neutrinos: Models and Phenomenology
• Where to find a dark matter sterile neutrino?
• Warm Dark Matter in Low Scale Left-Right Theory
• The velocity width function of galaxies from the 40% ALFALFA survey: shedding light on the cold dark matter overabundance problem
• Dark Matter from Split Seesaw
• Direct X-ray Constraints on Sterile Neutrino Warm Dark Matter
• Constraining the window on sterile neutrinos as warm dark matter
• Constraints on Sterile Neutrino Dark Matter
• Constraining DM properties with SPI
• Constraints on the parameters of radiatively decaying dark matter from the dark matter halo of the Milky Way and Ursa Minor
• Constraints on decaying Dark Matter from XMM-Newton observations of M31
• On the hadronic contribution to sterile neutrino production
• Radiative seesaw: Warm dark matter, collider and lepton flavour violating signals
• Limits on the Radiative Decay of Sterile Neutrino Dark Matter from the Unresolved Cosmic and Soft X-ray Backgrounds
• New Limits on Sterile Neutrinos from Suzaku Observations of the Ursa Minor Dwarf Spheroidal Galaxy
• Sterile neutrinos in the Milky Way: Observational constraints
• Constraining sterile neutrino dark matter by phase-space density observations
• Light Sterile Neutrino in the Minimal Extended Seesaw
• Mixing of Active and Sterile Neutrinos
• The masses of active neutrinos in the nuMSM from X-ray astronomy
• Soft L_e-L_mu-L_tau flavour symmetry breaking and sterile neutrino keV Dark Matter
• Model independent analysis of dark matter points to a particle mass at the keV scale
• Sterile neutrino dark matter in $B-L$ extension of the standard model and galactic 511 keV line
• The mass of the dark matter particle from theory and observations
• Cores and Cusps in Warm Dark Matter Halos
• Q_6 flavor symmetry model for the extension of the minimal standard model by three right-handed sterile neutrinos
• Deriving Models for keV sterile Neutrino Dark Matter with the Froggatt-Nielsen mechanism
• The Nonlinear Cosmological Matter Power Spectrum with Massive Neutrinos I: The Halo Model
• Searching for dark matter sterile neutrino in laboratory
• Small scale aspects of warm dark matter : power spectra and acoustic oscillations
• Sterile Neutrinos for Warm Dark Matter and the Reactor Anomaly in Flavor Symmetry Models
• Inert-Sterile Neutrino: Cold or Warm Dark Matter Candidate
• A4 Flavor Models in Split Seesaw Mechanism
• Warm Dark Matter from keVins
• Composite Dirac Neutrinos
• keV scale ${\nu }_R$ dark matter and its detection in $\beta$ decay experiment
• Sterile neutrinos produced near the EW scale I: mixing angles, MSW resonances and production rates
• Statistical Analysis of future Neutrino Mass Experiments including Neutrino-less Double Beta Decay
• Warm dark matter at small scales: peculiar velocities and phase space density
• KeV Warm Dark Matter and Composite Neutrinos
• Symmetry, dark matter and LHC phenomenology of the minimal $\nu$SM

Cited by in corpus (9)

• A White Paper on keV Sterile Neutrino Dark Matter
• The Phenomenology of Right Handed Neutrinos
• Dark Matter, Baryogenesis and Neutrino Oscillations from Right Handed Neutrinos
• Sterile Neutrinos as the Origin of Dark and Baryonic Matter
• New Production Mechanism for keV Sterile Neutrino Dark Matter by Decays of Frozen-In Scalars
• Dodelson-Widrow Production of Sterile Neutrino Dark Matter with Non-Trivial Initial Abundance
• Influence of a keV sterile neutrino on neutrino-less double beta decay -- how things changed in the recent years
• Separate seesaw and its applications to dark matter and baryogenesis
• keV Sterile Neutrino Dark Matter and Low Scale Leptogenesis