Boosted self-interacting dark matter in a multi-component dark matter model
Boosted self-interacting dark matter in a multi-component dark matter model
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DOI：
10.1088/1475-7516/2018/10/020
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发表时间：
2018-06
影响因子：
6.4
通讯作者：
M. Aoki;Takashi Toma
中科院分区：
文献类型：
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作者：
M. Aoki;Takashi Toma
在多组分暗物质模型中，如果质量分裂足够大，暗物质中较轻的组分可以通过较重态的湮灭而得到增强。这种相对论性暗物质可以通过大型中微子探测器如超级神冈和冰立方探测到。此外，如果该过程是非弹性散射并且所产生的粒子的衰变长度足够短，则来自衰变的另一个签名也可以被检测到。在本文中，我们构建了一个简单的两个组件的暗物质模型与一个隐藏的U（1）D规范对称性，其中暗物质的轻组件有可能改善所谓的小尺度结构问题与大的自相互作用截面。我们估计的多切伦科夫环事件的数量，由于这两个提升的暗物质和随后的衰变的粒子产生的非弹性散射在超神冈未来的实验。一些相关的限制，如暗物质的直接探测和宇宙学观测，也被考虑在内。数值分析表明，在一定的参数空间中，只要能产生较大的自相互作用截面，就能在每年的超神冈台产生少量的多切伦科夫环事件。
In models of multi-component dark matter, the lighter component of dark matter can be boosted by annihilations of the heavier state if mass splitting is large enough. Such relativistic dark matter can be detectable via large neutrino detectors such as Super-Kamiokande and IceCube. Moreover, if the process is inelastic scattering and decay length of the produced particle is short enough, another signature coming from the decay can also be detectable. In this paper, we construct a simple two-component dark matter model with a hidden U(1)D gauge symmetry where the lighter component of dark matter has a potential to improve the so-called small scale structure problems with large self-interacting cross section. We estimate number of multi-Cherenkov ring events due to both of the boosted dark matter and subsequent decay of the particle produced by inelastic scattering at Hyper-Kamiokande future experiment. Some relevant constraints, such as dark matter direct detection and cosmological observations, are also taken into account. The numerical analysis shows that some parameter space which can induce large self-interacting cross section can give a few multi-Cherenkov ring events per year at Hyper-Kamiokande.