arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.09140hep-phastro-ph.HEastro-ph.SRhep-ex
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用GeV暗物质加热中子星

Heating neutron stars with GeV dark matter

Wai-Yee Keung, Danny Marfatia, Po-Yan Tseng

摘要:

老中子星(NS)可能捕获晕暗物质(DM),并被沉积的动能加热,因此表现得像一个热DM探测器,对广泛的DM质量和各种DM-夸克相互作用敏感。不久的将来,红外望远镜将测量NS温度下降到几千开尔文和探测NS加热DM捕获。我们专注于GeV质量狄拉克费米子DM(这是超出了目前DM直接检测实验)的情况下,DM捕获率可以饱和的几何限制。具体而言,我们研究了(1)一个模型,调用暗衰变的中子来解释中子寿命异常,(2)DM的框架耦合到夸克通过矢量流门户。在中子暗衰变模型中,NS可以具有大量的DM布居,使得即使DM-中子散射截面很小,DM俘获率也可以通过DM自相互作用达到几何极限。我们发现NS加热有更大的灵敏度比多π介子签名在大型地下探测器的中子暗衰变模型,和子GeV的伽马射线签名的夸克矢量门户模型。

英文摘要:

An old neutron star (NS) may capture halo dark matter (DM) and get heated up by the deposited kinetic energy, thus behaving like a thermal DM detector with sensitivity to a wide range of DM masses and a variety of DM-quark interactions. Near future infrared telescopes will measure NS temperatures down to a few thousand Kelvin and probe NS heating by DM capture. We focus on GeV-mass Dirac fermion DM (which is beyond the reach of current DM direct detection experiments) in scenarios in which the DM capture rate can saturate the geometric limit. For concreteness, we study (1) a model that invokes dark decays of the neutron to explain the neutron lifetime anomaly, and (2) a framework of DM coupled to quarks through a vector current portal. In the neutron dark decay model a NS can have a substantial DM population, so that the DM capture rate can reach the geometric limit through DM self-interactions even if the DM-neutron scattering cross section is tiny. We find NS heating to have greater sensitivity than multi-pion signatures in large underground detectors for the neutron dark decay model, and sub-GeV gamma-ray signatures for the quark vector portal model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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