A Vacuum Accumulation Solution to the Strong CP Problem

TL;DR

This paper proposes a novel solution to the strong CP problem by dynamically lifting the heta-vacua superselection rule, predicting light membranes coupled to gauge fields that could be experimentally detectable.

Contribution

It introduces a vacuum accumulation mechanism that avoids axions and predicts observable membrane-like resonances in particle accelerators.

Findings

Infinite vacua accumulated within heta < 10^{-9}

Prediction of light membranes coupled to gauge fields

Potential experimental signatures at particle accelerators

Abstract

We suggest a solution to the strong CP problem in which there are no axions involved. The superselection rule of the \theta-vacua is dynamically lifted in such a way that an infinite number of vacua are accumulated within the phenomenologically acceptable range of \theta < 10^{-9}, whereas only a measure-zero set of vacua remains outside of this interval. The general prediction is the existence of membranes to which the standard model gauge fields are coupled. These branes may be light enough for being produced at the particle accelerators in form of the resonances with a characteristic membrane spectrum.