SO(10) unified models and soft leptogenesis

Abstract

Motivated by the fact that, in some realistic models combining SO(10) GUTs and flavour symmetries, it is not possible to achieve the required baryon asymmetry through the CP asymmetry generated in the decay of right-handed neutrinos, we take a fresh look on how deep this connection is in SO(10). The common characteristics of these models are that they use the see-saw with right-handed neutrinos, predict a normal hierarchy of masses for the neutrinos observed in oscillating experiments and in the basis where the right-handed Majorana mass is diagonal, the charged lepton mixings are tiny. In addition these models link the up-quark Yukawa matrix to the neutrino Yukawa matrix Y^νwith the special feature of Y^ν_{11}-> 0 Using this condition, we find that the required baryon asymmetry of the Universe can be explained by the soft leptogenesis using the soft B parameter of the second lightest right-handed neutrino whose mass turns out to be around 10^8 GeV. It is pointed out that a natural way to do so is to use no-scale supergravity where the value of B ~1 GeV is set through gauge-loop corrections.

26 pages, 2 figures. Added references, new appendix of a relevant fit and improved comments

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Cited by in corpus (8)

• Leptogenesis
• Leptogenesis in the Exceptional Supersymmetric Standard Model: flavour dependent lepton asymmetries
• Early Universe effective theories: The Soft Leptogenesis and R-Genesis Cases
• On Quantum Effects in Soft Leptogenesis
• On Gaugino Contributions to Soft Leptogenesis
• Leptogenesis in $E_6\times U(1{)}_A$ SUSY GUT model
• Flavoured soft leptogenesis and natural values of the B term
• Bridging flavour violation and leptogenesis in SU(3) family models