11 research outputs found
Anarchy and Leptogenesis
We study if leptogenesis works successfully together with the neutrino mass
anarchy hypothesis. We find that the predicted neutrino mass spectrum is
sensitive to the reheating temperature or the inflaton mass, while the
distributions of the neutrino mixing angles and CP violation phases remain
intact as determined by the invariant Haar measure of U(3). In the case of
thermal leptogenesis, the light neutrino mass distribution agrees well with the
observations if the reheating temperature is O(10^{9-11}) GeV. The mass
spectrum of the right-handed neutrinos and the neutrino Yukawa matrix exhibit a
certain pattern, as a result of the competition between random matrices with
elements of order unity and the wash-out effect. Non-thermal leptogenesis is
consistent with observation only if the inflaton mass is larger than or
comparable to the typical right-handed neutrino mass scale. Cosmological
implications are discussed in connection with the 125GeV Higgs boson mass.Comment: 29 pages, 6 figures. v2: figures and references added. v3: published
in JHE