论文标题
加热中子星带有GEV暗物质
Heating neutron stars with GeV dark matter
论文作者
论文摘要
旧的中子恒星（NS）可以捕获光环暗物质（DM）并被沉积的动能加热，因此表现得像热DM检测器，对广泛的DM质量和各种DM Quark相互作用具有敏感性。未来的红外望远镜将测量NS温度降低至几千kelvin，并通过DM捕获来探测NS供暖。在DM捕获速率可以饱和几何极限的情况下，我们关注GEV-MAS DIRAC FERMION DM（超出当前DM直接检测实验的范围）。为了具体，我们研究了（1）一种引用中子黑暗衰变以解释中子寿命异常的模型，以及（2）通过向量电流门户网站与夸克耦合的DM框架。在中子黑暗衰变模型中，NS可以具有大量的DM群体，因此即使DM-Neutron散射横截面很小，DM捕获率也可以通过DM自相互作用达到几何极限。我们发现NS加热比中子暗衰减模型的大地下检测器中的多杆子特征具有更高的灵敏度，以及Quark Vector Portal模型的Sub-GEV伽马射线签名。
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.
