arXiv 1705.044192017-05hep-phastro-ph.COastro-ph.HE

多体衰变暗物质中的高能中微子

High-energy Neutrinos from Multi-body Decaying Dark Matter

Nagisa Hiroshima, Ryuichiro Kitano, Kazunori Kohri, Kohta Murase

备注：: 19 pages, 6 figures, to appear in PRD
发表信息：: Phys. Rev. D 97, 023006 (2018)
DOI：: 10.1103/PhysRevD.97.023006

摘要：

自从IceCube合作组织报道PeV-TeV中微子以来，人们提出了各种粒子物理模型来解释中微子谱，即暗物质粒子衰变为中微子和其他标准模型粒子，在这种情况下，通常会同时发射$γ$射线。因此，多信使的联系对于间接寻找暗物质通常是重要的。$γ$射线天文学的最新发展对暗物质的性质提出了严格的限制，特别是最近几年费米$γ$射线卫星的观测。由于缺少$γ$射线以及IceCube观测到的中微子谱的形状，我们讨论了DM是PeV尺度粒子的情况，该粒子与其他不可见粒子强烈耦合，并且其衰变产物不包含带电粒子。作为实现这种可能性的一个例子，我们考虑一个费米暗物质模型，它衰变为一个中微子和许多不可见的费米子。暗物质衰变是隐蔽的，因为发射的产物主要是中微子和暗费米子。这个模型的一个显著特征是在暗物质的能量尺度附近产生的宽带中微子光谱。我们将此模型应用于多PeV的暗物质，并讨论可能的观测结果，根据冰立方数据。特别是，这个模型可以解释在$\sim10-100$ TeV的中等能量下的大通量，以及在PeV的第二个峰值，而不违反严格的$γ$ -费米和空气淋浴实验，如CASA-MIA的射线约束。

英文摘要：

Since the report of the PeV-TeV neutrinos by the IceCube Collaboration, various particle physics models have been proposed to explain the neutrino spectrum by dark matter particles decaying into neutrinos and other Standard Model particles.In such scenarios, simultaneous $γ$-ray emission is commonly expected. Therefore, multi-messenger connections are generally important for the indirect searches of dark matters. The recent development of $γ$-ray astronomy puts stringent constraints on the properties of dark matter, especially by observations with the Fermi $γ$-ray satellite in the last several years. Motivated by the lack of $γ$-ray as well as the shape of the neutrino spectrum observed by IceCube, we discuss a scenario in which the DM is a PeV scale particle which couples strongly to other invisible particles and its decay products do not contain a charged particle. As an example to realize such possibilities, we consider a model of fermionic dark matter that decays into a neutrino and many invisible fermions. The dark matter decay is secluded in the sense that the emitted products are mostly neutrinos and dark fermions. One remarkable feature of this model is the resulting broadband neutrino spectra around the energy scale of the dark matter. We apply this model to multi-PeV dark matter, and discuss possible observable consequences in light of the IceCube data. In particular, this model could account for the large flux at medium energies of $\sim10-100$ TeV, possibly as well as the second peak at PeV, without violating the stringent $γ$-ray constraints from Fermi and air-shower experiments such as CASA-MIA.

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