Constraints on the dark matter annihilations by neutrinos with substructure effects included
- Institute of Theoretical Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
- Center for High Energy Physics, Peking University, Beijing 100871 (China)
Dark matter (DM) annihilations in the Galaxy may produce high-energy neutrinos, which can be detected by the neutrino telescopes, for example, IceCube, ANTARES, and Super-Kamiokande. The neutrinos can also arise from hadronic interaction between cosmic rays and the atmosphere around the Earth, known as atmospheric neutrino. Current measurements on neutrino flux are consistent with theoretical prediction of atmospheric neutrino within the uncertainties. In this paper, by requiring that the DM annihilation neutrino flux is less than the current measurements, we obtain an upper bound on the cross section of dark matter annihilation <{sigma}v>. Compared with previous investigations, we improve the bound by including DM substructure contributions. In our paper, two kinds of substructure effects are scrutinized. One is the substructure average contribution over all directions. The other is the point source effect by a single massive subhalo. We found that the former can improve the bound by several times, while the latter can improve the bound by 10{sup 1}{approx}10{sup 4} utilizing the excellent angular resolution of the neutrino telescope IceCube. The exact improvement depends on the DM profile and the subhalo concentration model. In some models, IceCube can achieve the sensitivity of <{sigma}v>{approx}10{sup -26} cm{sup 3} s{sup -1}.
- OSTI ID:
- 21254181
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 6; Other Information: DOI: 10.1103/PhysRevD.78.065027; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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