缪子、π介子与被困中微子对中子星并合的影响
The Influence of Muons, Pions, and Trapped Neutrinos on Neutron Star Mergers
AI总结：
本研究通过广义相对论流体动力学模拟，系统评估了缪子、π介子及被困中微子对中子星并合的影响，发现其导致并合后引力波频率偏移100-200赫兹。
摘要：
两颗中子星的并合在高温、中微子被困的极端状态下探测致密物质的性质。在本工作中，我们研究了在被困状态下完全考虑π介子、缪子以及缪子型中微子如何影响并合的结果。通过采用系统性地添加这些不同粒子种类的物态方程，对并合中子星进行完全广义相对论流体动力学模拟，我们旨在详细评估缪子和π介子对并合及并合后阶段的影响。我们特别研究了并合热力学、质量抛射以及引力波辐射。我们的发现与先前的预期一致，即相对于一个基准的冷核子物态方程模型，包含这些微观自由度以及有限温度修正会导致并合后引力波信号出现约100-200赫兹的频率偏移。
英文摘要：
The merger of two neutron stars probes dense matter in a hot, neutrino-trapped regime. In this work, we investigate how fully accounting for pions, muons, and muon-type neutrinos in the trapped regime may affect the outcome of the merger. By performing fully general-relativistic hydrodynamics simulations of merging neutron stars with equations of state to which we systematically add those different particle species, we aim to provide a detailed assessment of the impact of muons and pions on the merger and post-merger phase. In particular, we investigate the merger thermodynamics, mass ejection and gravitational wave emission. Our findings are consistent with previous expectations, that the inclusion of such microphysical degrees of freedom and finite temperature corrections leads to frequency shifts on the order of 100-200 Hz in the post-merger gravitational wave signal, relative to a fiducial cold nucleonic equation of state model.
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