Semi-realistic Heterotic Z2 X Z2 Orbifold Models

Details Semi-realistic Heterotic Z2 X Z2 Orbifold Models Semi-realistic Heterotic Z2 X Z2 Orbifold Models

2009-08-21

arxiv.org/abs/0908.3164v1

Physics

High Energy Physics

High Energy Physics - Theory

141 pages, 7 figures, PhD Thesis (Supervisor Prof. A.E.Faraggi)

Scientific paper

We consider the heterotic E8 X E8 string theory, which gives rise to four-dimensional Standard-like Models and allows for their SO(10) embedding. We investigate two different schemes of compactification: the free fermionic formulation and the orbifold construction. In the examples presented in the free fermionic formulation we explore the removal of the extra Higgs representations by using the free fermion boundary conditions directly at the string level, rather than in the effective low energy field theory. Moreover, by employing the standard analysis of flat directions we present a quasi-realistic three generation string model in which stringent F- and D- flat solutions do not appear to exist to all orders in the superpotential. We show that, by choosing a non-factorisable compactification lattice, defined by skewing its standard simple roots, we decrease the total number of generations. Finally, the construction of modular invariant partition functions for E8 X E8 orbifold compactifications is presented.

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