Possible Evidence For Axino Dark Matter In The Galactic Bulge

Dan Hooper; Lian-Tao Wang

Possible Evidence For Axino Dark Matter In The Galactic Bulge

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arxiv hep-ph/0402220 v3 pith:GXRIRUT6 submitted 2004-02-20 hep-ph astro-ph

Dan Hooper , Lian-Tao Wang This is my paper · ORCID

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Recently, the SPI spectrometer on the INTEGRAL satellite observed strong 511 keV line emission from the galactic bulge. Although the angular distribution (spherically symmetric with width of \sim 9 degree) of this emission is difficult to account for with traditional astrophysical scenarios, light dark matter particles could account for the observation. In this letter, we consider the possibility that decaying axinos in an R-parity violating model of supersymmetry may be the source of this emission. We find that \sim 1-300 MeV axinos with R-parity violating couplings can naturally produce the observed emission.

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Relaxation of Energy Constraints for Positrons Generating the Galactic Annihilation Signal
astro-ph.HE 2025-06 conditional novelty 6.0 of 10

A full forward model of INTEGRAL, COMPTEL, and EGRET data relaxes the upper limit on positron injection energy for the Galactic 511 keV signal from a few MeV to roughly 40-60 MeV.

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