511 keV $γ$-ray emission from the galactic bulge by MeV millicharged dark matter

Details 511 keV $γ$-ray emission from the galactic bulge by MeV millicharged dark matter 511 keV $γ$-ray emission from the galactic bulge by MeV millicharged dark matter

2008-09-11

arxiv.org/abs/0809.1953v1

AIP Conf.Proc.1078:554-556,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 1 figure, A talk given by J.C.Park at the 16th International Conference on Supersymmetry and the Unification of Funda

Scientific paper

10.1063/1.3052025

We propose a possible explanation for the recently observed anomalous 511 keV line with a new "millicharged" fermion. This new fermion is light [${\cal O}({\rm MeV})$]. Nevertheless, it has never been observed by any collider experiments by virtue of its tiny electromagnetic charge $\epsilon e$. In particular, we constrain parameters of this millicharged particle if the 511 keV cosmic $\gamma$-ray emission from the galactic bulge is due to positron production from this new particle.

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