Classification of Heterotic Pati-Salam Models

Understand

We extend the classification of free fermionic heterotic-string models to vacua in which the SO(10) GUT symmetry is broken at the string level to the Pati-Salam subgroup.

• Using our classification method we recently presented the first example of a quasi--realistic heterotic-string vacuum that is free of massless exotic states.
• Within this method we are able to derive algebraic expressions for the generalised GSO projections for all sectors that appear in the models.
• This facilitates the programming of the entire spectrum analysis in a computer code.