Papers › Advancing Globular Cluster Constraints on the Axion-Photon Coupling
Advancing Globular Cluster Constraints on the Axion-Photon Coupling
Matthew J. Dolan, Frederick J. Hiskens, Raymond R. Volkas
The archive published only this paper's code-link row. Authors, date and abstract are from arXiv's metadata (CC0), read from the Kaggle arXiv metadata snapshot of 2026-09-12 where its title matched the archive's; the title is the archive's.
We improve the current upper bound on the axion-photon coupling derived from stellar evolution using the R₂ parameter, the ratio of stellar populations on the Asymptotic Giant Branch to Horizontal Branch in Globular Clusters. We compare this with data from simulations using the stellar evolution code MESA which include the effects of axion production. Particular attention is given to quantifying in detail the effects of uncertainties on the R and R₂ parameters due to the modelling of convective core boundaries. Using a semiconvective mixing scheme we constrain the axion-photon coupling to be gₐᵧᵧ < 0.47 ×10⁻¹⁰ GeV⁻¹. This rules out new regions of QCD axion and axion-like particle parameter space. Complementary evidence from asteroseismology suggests that this could improve to as much as gₐᵧᵧ < 0.34 ×10⁻¹⁰ GeV⁻¹ as the uncertainties surrounding mixing across convective boundaries are better understood.
Code
Repository list and official/mentioned flags are the archive's, frozen 2025-07-28. Reachability, where shown, is from one Syntology probe window (2026-09-16 to 2026-09-18); repositories not probed show nothing. GitHub stars are not tracked.
Code Syntology ran Syntology
Not run by Syntology. Nothing on this page verifies that the listed code works.
Results from the paper archive 2025-07-28
No leaderboard rows for this paper in the archive.
Report a problem or propose a change · a person checks every report against the paper or source before anything changes; decisions are listed on /corrections