Addendum to Reconciling Grand Unification with Strings by Anisotropic Compactifications

TL;DR

This paper extends previous work on string-based grand unification models by demonstrating that a specific solution remains consistent when considering D=0 conditions, reinforcing its viability within orbifold GUT frameworks.

Contribution

It provides an additional consistency check for a grand unification solution in heterotic string models, specifically addressing D=0 conditions in orbifold GUT limits.

Findings

Solution remains consistent with D=0 conditions

Supports viability of gauge coupling unification in mini-landscape models

Confirms decoupling of exotics with F=0 is compatible with D=0

Abstract

In a recent paper, by working in the orbifold GUT limit of the Heterotic string, we showed how one could accommodate gauge coupling unification in the "mini-landscape" models of Lebedev et al. Furthermore, it was shown how one of the solutions was consistent with the decoupling of other exotics with F=0. In this short addendum, we show that this solution is also consistent with D=0.