Towards classification of SO(10) heterotic string vacua

Abstract

We report some recent progress towards classification of phenomenologically appealing heterotic string models in the Free Fermionic Formulation. We focus on a class of Z2xZ2 models with SO(10) space-time gauge symmetry and study their main phenomenological aspects. We further consider reducing the gauge symmetry to the Pati-Salam gauge group SU(4)XSU(2)_LxSU(2)_R and impose a series of phenomenological constraints including the existence of gauge symmetry breaking Higgs particles and the elimination of exotic fractionally charged states.

Comments: 4 pages, 2 figures, To appear in the proceedings of 10th Hellenic School and Workshops on Elementary Particle Physics and Gravity (CORFU2010), Corfu, Greece, 29 Aug - 19 Sep 2010