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Anomalies in Time Delays of Lensed Gravitational Waves and Dark Matter Substructures
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2018-10-31 , DOI: 10.3847/1538-4357/aae30f
Kai Liao 1 , Xuheng Ding 2 , Marek Biesiada 3, 4 , Xi-Long Fan 5 , Zong-Hong Zhu 2, 3
Affiliation  

The cold dark matter scenario of hierarchical large-scale structure formation predicts the existence of abundant subhalos around large galaxies. However, the number of observed dwarf galaxies is far from this theoretical prediction, suggesting that most of the subhalos could be dark or quite faint. Gravitational lensing is a powerful tool to probe the mass distribution directly irrespective of whether it is visible or dark. Time delay anomalies in strongly lensed quasar systems are complementary to flux ratio anomalies in probing dark matter substructure in galaxies. Here we propose that lensed gravitational waves detected by the third-generation ground detectors with quite accurate time delay measurements could be a much better tool for this study than conventional techniques. Combined with good quality images of lensed host galaxies identified by the electromagnetic counterpart measurements, lensed GW signals could make the systematic errors caused by dark matter substructures detectable at several percent levels, depending on their mass functions, internal distribution of subhalos and lensing system configuration.

中文翻译:

透镜引力波和暗物质子结构的时滞异常

分层大尺度结构形成的冷暗物质情景预测大型星系周围存在丰富的亚晕。然而,观测到的矮星系的数量与这个理论预测相去甚远,这表明大多数亚晕可能是暗的或非常微弱的。引力透镜是直接探测质量分布的强大工具,无论它是可见的还是黑暗的。强透镜类星体系统中的时间延迟异常与探测星系暗物质子结构中的通量比异常是互补的。在这里,我们建议由具有相当准确的时间延迟测量的第三代地面探测器探测到的透镜引力波可能是比传统技术更好的研究工具。
更新日期:2018-10-31
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