Singlets in Supersymmetry
S. A. Abel
Abstract
It is argued that singlet extensions of the MSSM at the weak scale are indicative of either gauged-R symmetry or target space duality in a string effective action at the Planck scale. The criteria used are satisfactory primordial nucleosynthesis, absence of fine-tuning, and absence of cosmological problems such as domain walls. Models which have a global discrete symmetry such as the NMSSM may only be accommodated within rather complicated cosmological scenarios which are also discussed.
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