511 keV line and diffuse gamma rays from moduli

Details 511 keV line and diffuse gamma rays from moduli 511 keV line and diffuse gamma rays from moduli

2006-02-14

arxiv.org/abs/astro-ph/0602296v2

Phys.Rev. D73 (2006) 063007

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, published version

Scientific paper

10.1103/PhysRevD.73.063007

We obtain the spectrum of gamma ray emissions from the moduli whose decay into $e^+ e^-$ accounts for the 511 keV line observed by SPI/INTERGRAL. The moduli emit gamma rays through internal bremsstrahlung, and also decay directly into two gammas via tree and/or one-loop diagrams. We show that the internal bremsstahlung constrains the mass of the moduli below $\sim 40$ MeV model-independently. On the other hand, the flux of two gammas directly decayed from the moduli through one loop diagrams will exceed the observed galactic diffuse gamma-ray background if the moduli mass exceeds $\sim 20$ MeV in the typical situation. Moreover, forthcoming analysis of SPI data in the range of 1-8 MeV may detect the line emisson with the energy half the moduli mass in the near future, which confirms the decaying moduli scenario.

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