paper

SN 1987A Gamma-Ray Limits on the Conversion of Pseudoscalars

arXiv:astro-ph/9605197 · doi:10.1016/0370-2693(96)00778-2

Abstract

Pseudoscalar particles usually couple electromagnetically by an interaction of the form $\frc14 g ϕF {\widetilde F}$, allowing them to convert to photons in the presence of magnetic fields. Notably, new low-mass pseudoscalars emitted from supernova (SN) 1987A would have been converted to -rays in the intervening magnetic field of the galaxy. Therefore, measurements by the Solar Maximum Mission (SMM) Gamma-Ray Spectrometer (GRS) can limit the inverse coupling constant to , assuming the pseudoscalar is massless. This is an improvement over other astrophysical limits of a factor of about 2.5.

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