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Gamma-ray triangles: A possible signature of asymmetric dark matter in indirect searches
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 4
2016 (English)In: Physical Review D, ISSN 2470-0010, Vol. 94, no 10, 103003Article in journal (Refereed) Published
Abstract [en]

We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such a spectral feature and, therefore, set strong upper bounds on the corresponding annihilation cross section. A concrete realization of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches.

Place, publisher, year, edition, pages
2016. Vol. 94, no 10, 103003
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-136744DOI: 10.1103/PhysRevD.94.103003ISI: 000387393200001OAI: oai:DiVA.org:su-136744DiVA: diva2:1056875
Available from: 2016-12-15 Created: 2016-12-14 Last updated: 2017-01-11Bibliographically approved

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