Gamma-ray triangles: A possible signature of asymmetric dark matter in indirect searches
Number of Authors: 4
2016 (English)In: Physical Review D, ISSN 2470-0010, Vol. 94, no 10, 103003Article in journal (Refereed) Published
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
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-136744DOI: 10.1103/PhysRevD.94.103003ISI: 000387393200001OAI: oai:DiVA.org:su-136744DiVA: diva2:1056875