`Classification of the Flipped SU(5) Heterotic-String Vacua'

Abstract:
We extend the classification of the free fermionic heterotic-string models to
vacua in which the SO(10) GUT symmetry is broken at the string scale to the
flipped SU(5) subgroup. Using the classification methods recently adopted, 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 program. The total number of vacua
in the class of models to be classified is 2^{44} (approximately 10^{13}). We
perform a statistical sampling in this space of models and extract 10^{13}
distinct configurations with the flipped SU(5) gauge Group.