A fresh look on the limit on ultralight axion-like particles from SN1987A

TL;DR

This paper revisits constraints on ultralight axion-like particles from SN1987A by incorporating updated supernova models, modern galactic magnetic field data, and refined particle interaction calculations, resulting in an improved exclusion plot.

Contribution

It provides a new, more accurate limit on ALP-photon coupling using recent astrophysical data and advanced modeling techniques.

Findings

Updated exclusion limits for ALPs from SN1987A

Comparison with other experimental bounds

Implications for future ALP searches

Abstract

We revisit the limit on very light axion-like particles (ALPs) from the absence of gamma rays coincidental with the neutrino burst from SN1987A. We use updated supernova simulations, modern models for the magnetic field inside the Galaxy, and a Primakoff cross section which takes into account proton-degeneracy and mass-reduction effects. We finally give an updated exclusion plot for the electromagnetic coupling of sub-eV ALPs, comparing our new bound with other limits as well as with future ALP searches.