Exploring the SO(32) Heterotic String
Hans Peter Nilles, Saul Ramos-Sanchez, Patrick K.S. Vaudrevange, Akin, Wingerter

TL;DR
This paper classifies Z_N orbifold compactifications of the heterotic SO(32) string, analyzing spinor representations and highlighting its potential for realistic models and dualities within string theory.
Contribution
It provides a complete classification of orbifold compactifications of the heterotic SO(32) string and examines the role of spinor representations for model building.
Findings
Complete classification of Z_N orbifold compactifications
Analysis of spinor representations in detail
Heterotic SO(32) string as a significant part of the string landscape
Abstract
We give a complete classification of Z_N orbifold compactification of the heterotic SO(32) string theory and show its potential for realistic model building. The appearance of spinor representations of SO(2n) groups is analyzed in detail. We conclude that the heterotic SO(32) string constitutes an interesting part of the string landscape both in view of model constructions and the question of heterotic-type I duality.
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