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Cosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter

The observed anomalous excess of high-energy cosmic ray (CR) positrons is widely discussed as possible indirect evidence for dark matter (DM). However, any source of cosmic positrons is inevitably the source of gamma radiation. The least model dependent test of CR anomalies interpretation via DM particles decays (or annihilation) is connected with gamma-ray background due to gamma overproduction in such processes. In this work, we impose an observational constraint on gamma ray production from DM. Then, we study the possible suppression of gamma yield in the DM decays into identical final fermions. Such DM particles arise in the multi-component dark atom model. The influence of the interaction vertices on the gamma suppression was also considered. No essential gamma suppression effects are found. However, some minor ones are revealed.

preprint2020arXivOpen access
Konstantin M. BelotskyAirat Kh. KamaletdinovEkaterina S. ShlepkinaMaxim L. Solovyov
hep-phastro-ph.HE
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Konstantin M. BelotskyAirat Kh. KamaletdinovEkaterina S. ShlepkinaMaxim L. Solovyov

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