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 $\gamma -$rays by the galactic magnetic field. Measurements on the SN1987A $\gamma -$ray flux by the Gamma-Ray Spectrometer on the Solar Maximum Mission satellite already imply a bound on the coupling $g<3\times 10^{-12}$ 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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• Almost-Goldstone Bosons from Extra-Dimensional Gauge Theories

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