Open Descendants of NAHE-based free fermionic and Type I Z2^n models

TL;DR

This paper explores new type I string models based on NAHE-derived manifolds, introducing freely acting Z2 shifts that simplify spectra and enhance chiral matter, expanding the landscape of consistent string vacua.

Contribution

It constructs novel type I models with Z2^n modulations, analyzing their spectra and brane configurations, and discusses effects of discrete torsion on these models.

Findings

Simpler spectra with chiral matter in Z2^n models

Enhanced closed and open sectors with additional projections

Altered brane stacks compared to original orbifold models

Abstract

The NAHE-set, that underlies the realistic free fermionic models, corresponds to Z2XZ2 orbifold at an enhanced symmetry point, with (h_{11},h_{21})=(27,3). Alternatively, a manifold with the same data is obtained by starting with a Z2XZ2 orbifold at a generic point on the lattice and adding a freely acting Z2 involution. In this paper we study type I orientifolds on the manifolds that underly the NAHE-based models by incorporating such freely acting shifts. We present new models in the Type I vacuum which are modulated by Z2^n for n=2,3. In the case of n=2, the Z2XZ2 structure is a composite orbifold Kaluza-Klein shift arrangement. The partition function provides a simpler spectrum with chiral matter. For n=3, the case discussed is a Z2 modulation of the T6/(Z2 X Z2) spectrum. The additional projection shows an enhanced closed and open sector with chiral matter. The brane stacks are correspondingly altered from those which are present in the Z2 X Z2 orbifold. In addition, we discuss the models arising from the open sector with and without discrete torsion.