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arXiv 2006.16183astro-ph.HEhep-ph
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夸克解除禁闭对中子星合并和混合星合并的影响

Impact of quark deconfinement in neutron star mergers and hybrid star mergers

Andreas Bauswein, Sebastian Blacker

摘要:

我们描述了一个明确的引力波签名,以确定发生强相变从强子物质到解除夸克物质的中子星合并。这样的相变导致状态方程的强烈软化,因此与纯强子模型相比,合并残余物更紧凑。如果在合并过程中发生相变,这将导致合并后的主要引力波频率相对于潮汐变形特性的inspiral阶段的特征增加。通过比较不同的纯强子和混合模型的结果,我们表明,一个强大的相变可以确定从一个单一的,同时测量前和合并后的引力波。此外,我们提出了新的结果混合星合并,其中包含夸克物质已经在螺旋阶段。此外,对于这些系统,我们发现,合并后的GW频率增加相比,纯粹的强子模型。因此,我们的结论是,也混合星合并的强子-夸克相变在相对较低的密度开始可能会导致非常相同的特征签名的夸克解除禁闭在合并后的GW信号的系统在合并过程中经历的相变。

英文摘要:

We describe an unambiguous gravitational-wave signature to identify the occurrence of a strong phase transition from hadronic matter to deconfined quark matter in neutron star mergers. Such a phase transition leads to a strong softening of the equation of state and hence to more compact merger remnants compared to purely hadronic models. If a phase transition takes place during merging, this results in a characteristic increase of the dominant postmerger gravitational-wave frequency relative to the tidal deformability characterizing the inspiral phase. By comparing results from different purely hadronic and hybrid models we show that a strong phase transition can be identified from a single, simultaneous measurement of pre- and postmerger gravitational waves. Furthermore, we present new results for hybrid star mergers, which contain quark matter already during the inspiral stage. Also for these systems we find that the postmerger GW frequency is increased compared to purely hadronic models. We thus conclude that also hybrid star mergers with an onset of the hadron-quark phase transition at relatively low densities may lead to the very same characteristic signature of quark deconfinement in the postmerger GW signal as systems undergoing the phase transition during merging.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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