Some Advantages of SUSY SU(4) x SU(2)L x SU(2)R Model in String Derived SO(10) GUTs
Abstract
A D-parity violated SUSY SU(4) x SU(2) L x SU(2)R gauge model with the Higgs sector 2(4,1,2)+(4-bar,1, 2)+(1,2,2)+some(1,1,1)'s is shown to have the following advantages: (i) It is the simplest and almost unique solution that satisfies MX = Mstring ~0.6 x 1018 GeV and MINT ~ 5 x1011 GeV in superstring derived SUSY SO(10) GUTs. (ii) The proton is stable enough by the automatic "doublet-triplet splitting" closely connected with the D-parity violation. (iii) The minimization of SUSY one-loop effective potential in a toy model suggests that the SO(10) gauge theory tends to break dynamically down to the SU(4) x SU(2) L x SU(2)R model.
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