Possible Candidates for SUSY SO(10) Model with an Intermediate Scale

Abstract

We study the possibility of an intermediate scale existing in supersymmetric SO(10) grand unified theories: The intermediate scale is demanded to be around 10^{12} GeV so that neutrinos can obtain masses suitable for explaining the experimental data on the deficit of solar neutrino with Mikheev-Smirnov-Wolfenstein solution and the existence of hot dark matter. We show that any Pati-Salam type intermediate symmetries are excluded by requiring reasonable conditions and only $SU(2{)}_L\times SU(2{)}_R\times SU(3{)}_C\times U(1{)}_{B-L}$ is likely to be realized as an intermediate symmetry.

Comments: LaTeX, 8 pages + 1 uuencoded eps figure (Error corrected)