Universal neutrino mass hierarchy and cosmological baryon number asymmetry
نویسندگان
چکیده
منابع مشابه
Universal Neutrino Mass Hierarchy and Cosmological Baryon Number Asymmetry
We conjecture that three light Majorana neutrinos and their right-handed counterparts may have a universal geometric mass hierarchy. Incorporating this phenomenological conjecture with the Fritzsch texture of lepton mass matrices in a simple seesaw mechanism, we show that it is possible to simultaneously account for current neutrino oscillation data and the cosmological baryon number asymmetry ...
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In theories where B−L is a spontaneously broken local symmetry, the cosmological baryon asymmetry can be generated by the out-of-equilibrium decay of heavy Majorana neutrinos. We study this mechanism assuming a similar pattern of mixings and masses for leptons and quarks, as suggested by SO(10) unification. This implies that B−L is broken at the unification scale ΛGUT ∼ 1016 GeV, if mνμ ∼ 3 ·10...
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Due to sphaleron processes in the high-temperature symmetric phase of the standard model the cosmological baryon asymmetry is related to neutrino properties. For hierarchical neutrino masses, with B − L broken at the unification scale ΛGUT ∼ 1016 GeV, the observed baryon asymmetry nB/s ∼ 10−10 can be naturally explained by the decay of heavy Majorana neutrinos. We illustrate this mechanism with...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2004
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.70.071302