SN1987A gamma-ray limits on the conversion of pseudoscalars

Pseudoscalar particles θ usually couple electromagnetically by an interaction of the form 1 4 gθF 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 γ-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 g −1 > 1 × 10 11 GeV, assuming the pseudoscalar is massless. This is an improvement over other astrophysical limits of a factor of about 2.5.

Note:

10 pages, plus 4 PostScript files (included)

astrophysics: supernova
pseudoscalar particle: production
production: pseudoscalar particle
photon: cosmic radiation
magnetic field: galaxy
photon: flux
flux: photon
numerical calculations

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