论文标题
中子星邮政残留物中的不稳定性
Instabilities in neutron-star postmerger remnants
论文作者
论文摘要
使用非线性，完全相对论的模拟，我们研究了与中子星后遗物中的不稳定性相关的动力学和重力波签名。对于残余的简化模型，我们在具有中等$ t/| w | $的恒星中建立了不稳定性，动力学和引力势能之间的比率。对密度振荡模式的详细分析揭示了更逼真的差异旋转曲线的内部区域中的\ emph {local}的不稳定性。我们应用Rayleigh的拐点定理和Fjørtoft定理来分析稳定性标准，得出结论，该\ emph {Inner local}不稳定性源自接近角速速度峰值的剪切不稳定性，后来它将演变为快速旋转M = 2振荡模式。我们讨论了流体中存在旋律点的重要性，它与剪切不稳定性的联系以及与更广泛文献中考虑的Rossby Wave和Papaloizou Pringle的不稳定性的比较。
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.
