Abstract
A supersymmetric SU(2) L × SU(2) R × U(1) B− L gauge theory coupled to N = 1 supergravity is investigated. The scale of left-right gauge symmetry breaking is determined as M R ∼ M P e −1/ α by radiative corrections through the logarithmic evolution of soft supersymmetry breakings. SU(2) L × SU(2) R × U(1) B− L may be embedded in SO(10) grand unification. Cosmological implications intrinsic to the present model are also discussed, which may give a constraint M R ∼ 10 9−12 GeV.
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