Strong CP Problem with 10^{32} Standard Model Copies

TL;DR

The paper demonstrates that a large number of Standard Model copies can simultaneously address the Hierarchy and Strong CP Problems, predicting a small but measurable neutron electric dipole moment.

Contribution

It shows that multiple Standard Model copies naturally solve both the Hierarchy and Strong CP Problems without new physics like axions.

Findings

TeV scale explained with ~10^{32} Standard Model copies

Predicts a neutron electric dipole moment of about 10^{-9}

Links black hole physics to particle species count

Abstract

We show that a recently proposed solution to the Hierarchy Problem simultaneously solves the Strong CP Problem, without requiring an axion or any further new physics. Consistency of black hole physics implies a non-trivial relation between the number of particle species and particle masses, so that with ~10^{32} copies of the standard model, the TeV scale is naturally explained. At the same time, as shown here, this setup predicts a typical expected value of the strong-CP parameter in QCD of theta ~ 10^{-9}. This strongly motivates a more sensitive measurement of the neutron electric dipole moment.