Standard-like models from intersecting D4-branes

TL;DR

This paper constructs intersecting D4-brane models that replicate the Standard Model with additional matter, achieving anomaly cancellation and realistic fermion masses, and predicts a low string scale compatible with current gauge coupling observations.

Contribution

It introduces a new class of non-supersymmetric intersecting D4-brane models with realistic features and a low string scale, expanding string phenomenology models.

Findings

Achieves anomaly-free models with Standard Model-like spectrum

Predicts a string scale between 1-10 TeV

Obtains a Higgs mass near current experimental bounds

Abstract

We construct a one-parameter set of intersecting D4-brane models, with six stacks, that yield the (non-supersymmetric) standard model plus extra vector-like matter. Twisted tadpoles and gauge anomalies are cancelled, and the model contains all of the Yukawa couplings to the tachyonic Higgs doublets that are needed to generate mass terms for the fermions. A string scale in the range 1-10 TeV and a Higgs mass not much greater than the current bound is obtained for certain values of the parameters, consistently with the observed values of the gauge coupling constants.