A Realistic World from Intersecting D6-Branes

TL;DR

This paper presents a realistic intersecting D6-brane model in Type IIA string theory that reproduces the Standard Model features, unifies gauge couplings, and predicts testable supersymmetric spectra and dark matter candidates.

Contribution

It constructs a three-family D6-brane model with realistic phenomenology, including gauge symmetry breaking, unification, and explanations for fermion masses and mixings.

Findings

Achieves gauge coupling unification near the string scale.

Predicts low-energy supersymmetric particle spectrum testable at LHC.

Provides a mechanism for dark matter density consistent with observations.

Abstract

We briefly describe a three-family intersecting D6-brane model in Type IIA theory on the T^6/(Z_2 x Z_2) orientifold with a realistic phenomenology. In this model, the gauge symmetry can be broken down to the Standard Model (SM) gauge symmetry close to the string scale, and the gauge coupling unification can be achieved. We calculate the supersymmetry breaking soft terms, and the corresponding low energy supersymmetric particle spectrum, which may be tested at the Large Hadron Collider (LHC). The observed dark matter density may also be generated. Finally, we can explain the SM quark masses and CKM mixings, and the tau lepton mass. The neutrino masses and mixings may be generated via the seesaw mechanism as well.