论文标题
与脉冲星时相关性的暗物质子结构的可观察性
Observability of Dark Matter Substructure with Pulsar Timing Correlations
论文作者
论文摘要
小规模上的暗物质子结构目前受到薄弱的约束，其研究可能会阐明暗物质的性质。在这项工作中，我们研究了暗物质亚结构对脉冲星定时阵列（PTA）中测得的脉冲星相的重力作用。由于观察到数年的脉冲相的稳定性，地球脉冲系统周围的暗物质子结构可以在重力多普勒和夏皮罗延迟中识别可识别的特征。我们计算由一般暗物质子结构引起的PULSAR相相关性，以及一些模型（例如单色原始黑洞（PBH））和冷暗物质（CDM）类似NFW Subhalos的项目约束。这项工作扩展了我们先前的分析，该分析的重点是静态或单个过渡事件，以对多个过境事件进行随机分析。我们发现，与平方公里阵列（SKA）相似的PTA中的随机相关性具有唯一强大的功能，可以限制Subhalos的光线，如$ \ sim 10^{ - 13} 〜M_ \ odot $，其浓度低于标准CDM预测的浓度。
Dark matter substructure on small scales is currently weakly constrained, and its study may shed light on the nature of the dark matter. In this work we study the gravitational effects of dark matter substructure on measured pulsar phases in pulsar timing arrays (PTAs). Due to the stability of pulse phases observed over several years, dark matter substructure around the Earth-pulsar system can imprint discernible signatures in gravitational Doppler and Shapiro delays. We compute pulsar phase correlations induced by general dark matter substructure, and project constraints for a few models such as monochromatic primordial black holes (PBHs), and Cold Dark Matter (CDM)-like NFW subhalos. This work extends our previous analysis, which focused on static or single transiting events, to a stochastic analysis of multiple transiting events. We find that stochastic correlations, in a PTA similar to the Square Kilometer Array (SKA), are uniquely powerful to constrain subhalos as light as $\sim 10^{-13}~M_\odot$, with concentrations as low as that predicted by standard CDM.
