期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2019/05/051
关键词
dark matter theory; ultra high energy photons and neutrinos
资金
- Fonds de la Recherche Scientifique-FNRS, Belgium [4.4503.19]
- Fonds de la Recherche Scientifique de Belgique (F.R.S.-FNRS) [2.5020.11]
- FAPESP Multi-user Project [09/54213-0]
- CNPq [310052/2016-5]
- Ramon y Cajal contract
- Spanish MINECO [FPA2017-84543-P, SEV-2014-0398]
- European Union [690575, 674896]
- Portuguese FCT through the CFTP-FCT Unit 777 [UID/FIS/00777/2019]
- Department of Energy [DE-FG02-13ER41976 (DE-SC0009913)]
In view of the IceCube's 6-year high-energy starting events (HESE) sample, we revisit the possibility that the updated data may be better explained by a combination of neutrino fluxes from dark matter decay and an isotropic astrophysical power-law than purely by the latter. We find that the combined two-component flux qualitatively improves the fit to the observed data over a purely astrophysical one, and discuss how these updated fits compare against a similar analysis done with the 4-year HESE data. We also update fits involving dark matter decay via multiple channels, without any contribution from the astrophysical flux. We find that a DM-only explanation is not excluded by neutrino data alone. Finally, we also consider the possibility of a signal from dark matter annihilations and perform analogous analyses to the case of decays, commenting on its implications.
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