论文标题
在星系簇中观察到的过多的小型重力镜头
An excess of small-scale gravitational lenses observed in galaxy clusters
论文作者
论文摘要
冷暗物质（CDM）构成了宇宙中的大部分物质。理论上，使用宇宙学模拟研究了理论上研究了密集的宇宙环境中的黑暗和发光物质之间的相互作用。观察到的引力透镜用于测试和表征簇中的子结构的特性 - 暗物质的小尺度分布。设计并计算出11个星系簇的APT度量，即暗物质亚结构产生的强镜头事件的概率。我们报告说，观察到的簇子结构比CDM模拟所预测的更有效的镜头，而不是一个数量级。我们建议迄今未诊断出具有模拟的系统问题或对暗物质特性的错误假设可以解释我们的结果。
Cold dark matter (CDM) constitutes most of the matter in the Universe. The interplay between dark and luminous matter in dense cosmic environments like galaxy clusters is studied theoretically using cosmological simulations. Observed gravitational lensing is used to test and characterize the properties of substructures - the small-scale distribution of dark matter - in clusters. An apt metric, the probability of strong lensing events produced by dark matter substructure, is devised and computed for 11 galaxy clusters. We report that observed cluster substructures are more efficient lenses than predicted by CDM simulations, by more than an order of magnitude. We suggest that hitherto undiagnosed systematic issues with simulations or incorrect assumptions about the properties of dark matter could explain our results.
