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arXiv 2005.13696astro-ph.HE
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中子星合并后残余物的不稳定性

Instabilities in neutron-star postmerger remnants

Xiaoyi Xie, Ian Hawke, Andrea Passamonti, Nils Andersson

摘要:

利用非线性、完全相对论性的模拟,我们研究了与中子星合并后残余物不稳定性相关的动力学和引力波特征。对于简化模型的残留物,我们建立了存在的不稳定性与中等$T/|W|$,动力和引力势能之间的比率的恒星。密度振荡模式的详细分析揭示了一个\emph{local}不稳定性的内部区域的更现实的差异旋转配置文件。我们应用瑞利的拐点定理和Fjørtoft的定理来分析的稳定性标准的结论是,这种\emph{inner local}不稳定性源于剪切不稳定性接近的峰值的角速度配置文件,它后来演变成一个快速旋转的m = 2振荡模式。我们讨论的重要性,在流体中的共转点的存在下,其连接的剪切不稳定性,并比较Rossby波和Papaloizou普林格尔不稳定性考虑在更广泛的文献。

英文摘要:

Using nonlinear, fully relativistic, simulations we investigate the dynamics and gravitational-wave signature associated with instabilities in neutron star postmerger remnants. For simplified models of the remnant we establish the presence of an instability in stars with moderate $T/|W|$, the ratio between the kinetic and the gravitational potential energies. Detailed analysis of the density oscillation pattern reveals a \emph{local} instability in the inner region of the more realistic differential rotation profile. We apply Rayleigh's inflection theorem and Fjørtoft's theorem to analyze the stability criteria concluding that this \emph{inner local} instability originates from a shear instability close to the peak of the angular velocity profile, and that it later evolves into a fast-rotating m=2 oscillation pattern. We discuss the importance of the presence of a corotation point in the fluid, its connection with the shear instability, and comparisons to the Rossby wave and Papaloizou Pringle instabilities considered in the wider literature.

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