511 keV Gamma Ray from Moduli Decay in the Galactic Bulge
Abstract
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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