Low intermediate scales for leptogenesis in supersymmetric SO(10) grand unified theories

@article{Majee2007LowIS,
  title={Low intermediate scales for leptogenesis in supersymmetric SO(10) grand unified theories},
  author={Swarup Kumar Majee and Mina Ketan Parida and Amitava Raychaudhuri and Utpal Sarkar},
  journal={Physical Review D},
  year={2007},
  volume={75},
  pages={075003}
}
A low intermediate scale within minimal supersymmetric SO(10) GUTs is a desirable feature to accommodate leptogenesis. We explore this possibility in models where the intermediate gauge symmetry breaks spontaneously by (a) doublet Higgs scalars and also (b) by triplets. In both scenarios, gauge coupling unification requires the scale of left-right symmetry breaking (M{sub R}) to be close to the unification scale. This will entail unnaturally small neutrino Yukawa couplings to avoid the… 
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