arXiv 2104.082902021-04hep-phastro-ph.CO

中子星中轴子暗物质转换的射电谱线性质

Radio Line Properties of Axion Dark Matter Conversion in Neutron Stars

R. A. Battye, B. Garbrecht, J. I. McDonald, S. Srinivasan

备注：: 16 pages, 10 figures plus table: updated journal version, including extra appendix
DOI：: 10.1007/JHEP09(2021)105

摘要：

轴子是暗物质的理想候选者。近年来，人们对探测中子星磁层中轴子暗物质共振转换产生的光子产生了极大的兴趣。各个小组已经开始获得无线电数据来搜索信号，然而，需要更多的工作来获得相应无线电线路的鲁棒理论预测。在这项工作中，我们推导出详细的属性的信号，同时获得线的形状和时间依赖性。主要的物理效应是来自等离子体中的折射以及来自引力，它们一起导致在脉冲周期上变化的实质性透镜效应。来自等离子体与脉冲星的共同旋转的时间依赖性使频率失真，导致多普勒展宽信号，其宽度随时间变化。对于我们的预测，我们跟踪曲线射线的视线使用完整的一套方程从哈密顿光学色散介质弯曲时空。因此，对于第一次，我们描述的线信号的详细形状以及其时间依赖性，这是更明显的早期结果相比。我们对信号特征的预测将是这种暗物质搜索的关键。

英文摘要：

Axions are well-motivated candidates for dark matter. Recently, much interest has focused on the detection of photons produced by the resonant conversion of axion dark matter in neutron star magnetospheres. Various groups have begun to obtain radio data to search for the signal, however, more work is needed to obtain a robust theory prediction for the corresponding radio lines. In this work we derive detailed properties for the signal, obtaining both the line shape and time-dependence. The principal physical effects are from refraction in the plasma as well as from gravitation which together lead to substantial lensing which varies over the pulse period. The time-dependence from the co-rotation of the plasma with the pulsar distorts the frequencies leading to a Doppler broadened signal whose width varies in time. For our predictions, we trace curvilinear rays to the line of sight using the full set of equations from Hamiltonian optics for a dispersive medium in curved spacetime. Thus, for the first time, we describe the detailed shape of the line signal as well as its time dependence, which is more pronounced compared to earlier results. Our prediction of the features of the signal will be essential for this kind of dark matter search.

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英文摘要：

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