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Several independent observations of the galactic core suggest hithertounexplained sources of energy. The most well known case is the 511 keV linewhich has proven very difficult to explain with conventional astrophysicalpositron sources. A similar, but less well known mystery is the excess ofgamma-ray photons detected by COMPTEL across a broad energy range 1-20 MeV.Such photons are found to be very difficult to produce via known astrophysicalsources. We show in this work that dark matter in the form of dense antimatterdroplets provides a natural explanations for the observed flux of gamma-rays inthe 1-20 MeV range. We argue thatsuch photons must always accompany the 511 keVline as they produced by the same mechanism within our framework. We calculatethe spectrum and intensity of the 1-20 MeV gamma-rays, and find it to beconsistent with the COMPTEL data.

Diffuse cosmic gamma-rays at 1-20 MeV: A trace of the dark matter?