Intermediate Scale Accidental Axion and ALPs

TL;DR

This paper explores models with axions and axion-like particles at intermediate energy scales, generated as accidental pseudo Nambu-Goldstone bosons within theories possessing exact discrete symmetries, motivated by astrophysical data.

Contribution

It introduces new models where axions and ALPs naturally emerge as accidental pseudo Nambu-Goldstone bosons from exact discrete symmetries, expanding the theoretical framework.

Findings

Models with decay constants from 10^9 to 10^13 GeV are constructed.

Axions and ALPs arise as accidental pseudo Nambu-Goldstone bosons.

The models are motivated by astrophysical observations.

Abstract

We discuss the problem of constructing models containing an axion and axion-like particles, motivated by astrophysical observations, with decay constants at the intermediate scale ranging from $10^9$GeV to $10^{13}$GeV. We present examples in which the axion and axion-like particles arise accidentally as pseudo Nambu-Goldstone bosons of automatic global chiral symmetries, in models having exact discrete symmetries.