Axion Detection Experiments Meet the Majoron

TL;DR

This paper explores the potential overlap between majoron dark matter models and axion search experiments, suggesting that current axion detection methods could also detect majorons due to their similar properties.

Contribution

It establishes a connection between majoron dark matter models and axion experiments, proposing that modifications to the majoron model predict detectable signals in existing axion search parameter space.

Findings

Majoron can be the main component of dark matter with a specific symmetry-breaking scale.

Electromagnetic-anomalous coupling in the majoron model overlaps with the QCD-axion dark matter band.

Axion search experiments are potentially capable of detecting majorons.

Abstract

The majoron is a well-motivated light (pseudo-Nambu-Goldstone) boson associated with the spontaneous breaking of a global lepton-number symmetry. In this {\it letter}, we relate the spontaneous breaking scale and its soft-breaking mass by requiring that the majoron is the main component of the dark matter. An electromagnetic-anomalous coupling can be induced by minimally modifying the original majoron model, surprisingly, predicting a parameter region that largely overlaps with the QCD-axion dark matter band. Thus, we expect that axion search experiments meet the majoron.