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Nambu mass hierarchies in low energy string models
1994
Physics Letters B
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We show that a recent proposal by Nambu to generate a hierarchy among Yukawa couplings in the standard model may be easily implemented in superstring models. In such models, two of the main ingredients of the Nambu proposal find a natural explanation: minimising with respect to the Yukawas amounts to a minimisation with respect to the underlying moduli fields and a constraint on the Yukawas of the type of the Veltman condition may be attributed to the relaxation process to a phenomenologically viable string vacuum.
doi:10.1016/0370-2693(94)91338-2
fatcat:eowyecxysjcfjiek5zyekp7jbm