Axion Detection Experiments Can Probe Majoron Models

Area of Science:

• Particle physics
• Cosmology
• Astroparticle physics

Background:

• The majoron is a hypothetical light boson linked to lepton-number symmetry breaking.
• Dark matter candidates are crucial for understanding the universe's composition.

Purpose of the Study:

• To investigate the majoron as a dark matter candidate.
• To connect the majoron's mass to its symmetry breaking scale.
• To explore potential detection strategies for majoron dark matter.

Main Methods:

• Relating the spontaneous breaking scale to the majoron's soft-breaking mass.
• Introducing an electromagnetic-anomalous coupling via minimal model modification.
• Comparing the predicted parameter region with existing dark matter constraints, particularly the QCD-axion band.

Main Results:

• The majoron can be the dominant component of dark matter.
• A parameter region exists where majoron dark matter properties overlap with QCD-axion dark matter.
• Electromagnetic-anomalous couplings can be induced in the majoron model.

Conclusions:

• Majoron dark matter models are testable with current and future axion search experiments.
• The study provides a novel connection between particle physics symmetries and dark matter phenomenology.
• This work opens new avenues for exploring beyond-Standard-Model physics with cosmological observations.