Soft L{sub e}−L{sub μ}−L{sub τ} flavour symmetry breaking and sterile neutrino keV Dark Matter

We discuss how a L{sub e}−L{sub μ}−L{sub τ} flavour symmetry that is softly broken leads to keV sterile neutrinos, which are a prime candidate for Warm Dark Matter. This is to our knowledge the first model where flavour symmetries are applied simultaneously to active and sterile neutrinos explaining...

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Bibliographic Details
Published inJournal of cosmology and astroparticle physics Vol. 2011; no. 1
Main Authors Lindner, Manfred, Merle, Alexander, Niro, Viviana
Format Journal Article
LanguageEnglish
Published United States 01.01.2011
Subjects
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPARATIVE EVALUATIONS
COSMOLOGY
FLAVOR MODEL
KEV RANGE
MASS SPECTRA
NEUTRINOS
NONLUMINOUS MATTER
REST MASS
SYMMETRY BREAKING
VISIBLE RADIATION
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Summary:We discuss how a L{sub e}−L{sub μ}−L{sub τ} flavour symmetry that is softly broken leads to keV sterile neutrinos, which are a prime candidate for Warm Dark Matter. This is to our knowledge the first model where flavour symmetries are applied simultaneously to active and sterile neutrinos explaining at the same time active neutrino properties and this peculiar Dark Matter scenario. The essential point is that different scales of the symmetry breaking and the symmetry preserving entries in the mass matrix lead to one right-handed neutrino which is nearly massless compared to the other two. Furthermore, we naturally predict vanishing θ{sub 13} and maximal θ{sub 23}, while the correct value of θ{sub 12} must come from the mixing of the charged leptons. We can furthermore predict an exact mass spectrum for the light neutrinos, which will be testable in the very near future.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2011/01/034