Gamma Rays from SN1987A due to Pseudoscalar Conversion
Abstract
A light pseudoscalar coupled to two photons would be copiously emitted by the core of a supernova. Part of this flux would be converted to γ-rays by the galactic magnetic field. Measurements on the SN1987A γ-ray flux by the Gamma-Ray Spectrometer on the Solar Maximum Mission satellite already imply a bound on the coupling g < 3 × 10-12 GeV-1. The improved generation of satellite-borne detectors, like EGRET or the project GLAST, could be able to detect a pseudoscalar-to-photon signal from a nearby supernova, for allowed values of g.
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