Abstract
We revisit the limit on very light axion-like particles (ALPs) from the absence of gammarays coincidental with the neutrino burst from SN1987A. We use updated supernova sim-ulations, modern models for the magnetic field inside the Galaxy, and a Primakoff crosssection 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.
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