Gauge Unification in Supersymmetric Intersecting Brane Worlds

TL;DR

This paper demonstrates that realistic supersymmetric intersecting brane models naturally predict gauge coupling unification near the GUT scale, with potential to reach the Planck scale by adding vector-like matter.

Contribution

It introduces a model-independent relation among gauge couplings in intersecting brane worlds that aligns with experimental data and predicts unification at high energy scales.

Findings

Predicts gauge coupling unification at ~2 x 10^16 GeV

Relates gauge couplings independently of specific model details

Unification scale can be extended to Planck scale with extra matter

Abstract

We show that contrary to first expectations realistic three generation supersymmetric intersecting brane world models give rise to phenomenologically interesting predictions about gauge coupling unification. Assuming the most economical way of realizing the matter content of the MSSM via intersecting branes we obtain a model independent relation among the three gauge coupling constants at the string scale. In order to correctly reproduce the experimentally known values of sin^2[theta_W(M_z)] and alpha_s(M_z) this relation leads to natural gauge coupling unification at a string scale close to the standard GUT scale 2 x 10^16 GeV. Additional vector-like matter can push the unification scale up to the Planck scale.