| 511 keV Gamma Ray from Moduli Decay in the Galactic Bulge (2005) | |||||||||
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.. Comment: 6 pages, no figure, we have added an appendix to describe the dilution of the moduli by the thermal inflation and some minor corrections | |||||||||
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