Proton Decay Constraints on Low Scale AdS/CFT Unification

Dark matter candidates and proton decay in a class of models based on the AdS/CFT correspondence are discussed. We show that the present bound on the proton decay lifetime is inconsistent with ${\cal N} = 1$ SUSY, and strongly constrains ${\cal N} = 0$ non-SUSY, low scale trinification type unification of orbifolded AdS$\otimes S^5$ models.