Axions and the RR Lyrae Period-Luminosity Relation

arXiv:2609.27159 · hep-ph, astro-ph.CO, astro-ph.GA, astro-ph.SR · Submitted 2026-09-22 · Read on arXiv

hep-ph, astro-ph.CO, astro-ph.GA, astro-ph.SR

Submitted: 2026-09-22

Updated: 2026-09-22

Terminology

• Core — 22× in this paper · explained in 2 episodes
• Calibration — 7× in this paper · explained in 7 episodes
• Standard Model — 7× in this paper
• Metallicity — 4× in this paper · explained in 3 episodes
• Abundance — 2× in this paper · explained in 1 episode
• Degeneracy — 2× in this paper · explained in 3 episodes
• Robustness — 2× in this paper · explained in 5 episodes

Sources

• Ultra-Light Pion and Baryon WIMPzilla Dark Matter
• The $\pi$-axion and $\pi$-axiverse of dark QCD
• Axions In String Theory
• String Axiverse
• New experimental approaches in the search for axion-like particles
• The landscape of QCD axion models
• Astrophysical Axion Bounds: The 2024 Edition
• Axion Astrophysics
• Neutrino and axion bounds from the globular cluster M5 (NGC 5904)
• Axion and neutrino bounds improved with new calibrations of the tip of the red-giant branch using geometric distance determinations
• The RGB tip of galactic globular clusters and the revision of the bound of the axion-electron coupling
• Impact of Simultaneous Stellar Modeling Uncertainties on the Tip of the Red Giant Branch for Axion-Election Coupling
• Stellar evolution and axion-like particles: new constraints and hints from globular clusters in the GAIA DR3 data
• Isochrone fitting of Galactic globular clusters - IX. Tip of the red-giant branch for 27 clusters and constraints on new particle physics
• Red giant bound on the axion-electron coupling reexamined
• The Helium-Core Mass at the Helium Flash in Low-Mass Red Giant Stars: Observations and Theory
• Near-infrared Census of RR Lyrae variables in the Messier 3 globular cluster and the Period--Luminosity Relations
• Missing in Action: New Physics and the Black Hole Mass Gap
• Light Axion Emission and the Formation of Merging Binary Black Holes
• Modules for Experiments in Stellar Astrophysics (MESA)

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• Axions as Dark Matter, Dark Energy, and Dark Radiation