A K-theory Anomaly Free Supersymmetric Flipped SU(5) Model from Intersecting Branes

TL;DR

This paper constructs a supersymmetric flipped SU(5) model from intersecting D-branes in type IIA string theory, ensuring anomaly cancellation and realistic particle content, advancing string phenomenology.

Contribution

It presents a novel intersecting brane model with anomaly-free, supersymmetric flipped SU(5) gauge symmetry and a realistic matter spectrum including Higgs sectors.

Findings

Complete GUT and electroweak Higgs sectors included

Model satisfies tadpole, supersymmetry, and K-theory constraints

Contains extra matter in bi-fundamental, vector-like, and symmetric representations

Abstract

We construct an N=1 supersymmetric three-family flipped SU(5) model from type IIA orientifolds on $T^6/(\Z_2\times \Z_2)$ with D6-branes intersecting at general angles. The model is constrained by the requirement that Ramond-Ramond tadpoles cancel, the supersymmetry conditions, and that the gauge boson coupled to the $U(1)_X$ factor does not get a string-scale mass via a generalised Green-Schwarz mechanism. The model is further constrained by requiring cancellation of K-theory charges. The spectrum contains a complete grand unified and electroweak Higgs sector, however the latter in a non-minimal number of copies. In addition, it contains extra matter both in bi-fundamental and vector-like representations as well as two copies of matter in the symmetric representation of SU(5).