We show that the e++e− decay of a light scalar boson of mass 1–10 MeV may account for the fluxes of 511 keV gamma ray observed by SPI/INTEGRAL. We argue that candidates of such a light scalar boson is one of the string moduli or a scalar partner of the axion in a supersymmetric theory.
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Kawasaki et al. (2005) studied this question.
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