Unification and the Hierarchy from AdS5

TL;DR

This paper explores gauge coupling unification in AdS5 models, showing that couplings run logarithmically and can unify at high scales, with a regularization scheme inspired by holography and conditions for near-perfect unification.

Contribution

It introduces a holography-motivated regularization scheme and demonstrates that gauge couplings in AdS5 can nearly unify, similar to the Standard Model, depending on cutoff and scalar content.

Findings

Couplings run logarithmically in AdS5, enabling perturbative unification.

Unification can occur at high scales depending on cutoff and scalar multiplets.

Good agreement with measured couplings under specific model parameters.

Abstract

In AdS5, the coupling for bulk gauge bosons runs logarithmically, not as a power law. For this reason, one can preserve perturbative unification of couplings. Depending on the cutoff, this can occur at a high scale. We discuss subtleties in the calculation and present a regularization scheme motivated by the holographic correspondence. We find that generically, as in the standard model, the couplings almost unify. For specific choices of the cutoff and number of scalar multiplets, there is good agreement between the measured couplings and the assumption of high scale unification.