Center for Particle and Gravitational Astrophysics; Department of Physics; Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Institute for Advanced Study, Princeton, New Jersey 08540, USA.
Phys Rev Lett. 2015 Aug 14;115(7):071301. doi: 10.1103/PhysRevLett.115.071301. Epub 2015 Aug 11.
Late time decay of very heavy dark matter is considered as one of the possible explanations for diffuse PeV neutrinos observed in IceCube. We consider implications of multimessenger constraints, and show that proposed models are marginally consistent with the diffuse γ-ray background data. Critical tests are possible by a detailed analysis and identification of the sub-TeV isotropic diffuse γ-ray data observed by Fermi and future observations of sub-PeV γ rays by observatories like HAWC or Tibet AS+MD. In addition, with several-year observations by next-generation telescopes such as IceCube-Gen2, muon neutrino searches for nearby dark matter halos such as the Virgo cluster should allow us to rule out or support the dark matter models, independently of γ-ray and anisotropy tests.
重暗物质的晚期时间衰减被认为是解释在冰立方中观测到的弥散 PeV 中微子的一种可能机制。我们考虑了多信使限制的影响，并表明所提出的模型与弥散γ射线背景数据勉强一致。通过对费米望远镜观测到的亚太赫兹各向同性弥散γ射线数据以及哈勃望远镜或西藏 AS+MD 等未来观测设备对亚 PeV γ射线的详细分析和识别，这些模型可以得到关键性的检验。此外，利用下一代望远镜（如冰立方第二代）进行数年观测，μ子中微子对附近暗物质晕，如处女座星系团的搜索，应该使我们能够独立于γ射线和各向异性测试来排除或支持暗物质模型。
