标题： 暗物质混合中子星双星的数值模拟 显示英文标题

标题： Numerical Simulations of Dark Matter Admixed Neutron Star Binaries

摘要： 多信使观测紧凑双星合并为限制可能积聚在中子星内部和周围的暗物质本质提供了新方法。 在本文中，我们扩展了数值相对论代码BAM的基础结构，以实现包含额外镜像暗物质成分的中子星模拟。 我们进行了单星测试以验证我们的代码以及此类首次双中子星模拟。 我们发现暗物质的存在会减少合并残余物的寿命，并有利于迅速坍缩成黑洞。 此外，我们发现对于总质量和质量比相同但暗物质含量不同的系统，合并时间存在差异。 最后，我们发现混合暗物质的双中子星合并产生的电磁信号极不可能像没有暗物质的对应情况那样明亮。 鉴于多信使设施的灵敏度不断提高，我们的分析为探测暗物质的存在提供了新的视角。 显示英文摘要

摘要： Multi-messenger observations of compact binary mergers provide a new way to constrain the nature of dark matter that may accumulate in and around neutron stars. In this article, we extend the infrastructure of our numerical-relativity code BAM to enable the simulation of neutron stars that contain an additional mirror dark matter component. We perform single star tests to verify our code and the first binary neutron star simulations of this kind. We find that the presence of dark matter reduces the lifetime of the merger remnant and favors a prompt collapse to a black hole. Furthermore, we find differences in the merger time for systems with the same total mass and mass ratio, but different amounts of dark matter. Finally, we find that electromagnetic signals produced by the merger of binary neutron stars admixed with dark matter are very unlikely to be as bright as their dark matter free counterparts. Given the increasing sensitivity of multi-messenger facilities, our analysis gives a new perspective on how to probe the presence of dark matter.