Self-gravitating disks around rapidly spinning, tilted black holes: General-relativistic simulations
Self-gravitating disks around rapidly spinning, tilted black holes: General-relativistic simulations
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DOI：
10.1103/physrevd.106.104010
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发表时间：
2022-09
影响因子：
5
通讯作者：
A. Tsokaros;M. Ruiz;S. Shapiro;V. Paschalidis
中科院分区：
文献类型：
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作者：
A. Tsokaros;M. Ruiz;S. Shapiro;V. Paschalidis
我们对自重黑洞圆盘进行了广义相对论模拟，其中黑洞的自转相对于圆盘的角动量明显倾斜(分别为45和90)，圆盘与黑洞的质量比为16-28美元。黑洞正在以高达0.97美元的无量纲自转快速旋转。这是第一次对这类系统进行自洽的流体动力学模拟，这可能是多传送器天文学的主要来源。特别是，倾斜的黑洞-盘系统导致：i)黑洞进动；ii)盘进动和围绕黑洞的翘曲；iii)与对准/对准系统相比，Papaloizou-Pringle不稳定性更早饱和，尽管具有更短的模式增长时间刻度；iv)获得小的黑洞启动速度；v)通过典型的$(2，2)$模以外的各种模式显著地发射引力波；以及vi)盘的角动量与黑洞自转的广泛对准的可能性。这种排列与Bardeen-Petterson效应无关，类似于固体旋转。我们的模拟表明，我们的模型中的任何电磁光度都可能为相对论喷流提供动力，例如那些表征短伽马射线爆发的喷流。根据黑洞-盘系统的尺度，引力波可能会被LIGO/Virgo、LISA和/或其他激光干涉仪探测到。
We perform general relativistic simulations of self-gravitating black hole-disks in which the spin of the black hole is significantly tilted ($45^\circ$ and $90^\circ$) with respect to the angular momentum of the disk and the disk-to-black hole mass ratio is $16\%-28\%$. The black holes are rapidly spinning with dimensionless spins up to $\sim 0.97$. These are the first self-consistent hydrodynamic simulations of such systems, which can be prime sources for multimessenger astronomy. In particular tilted black hole-disk systems lead to: i) black hole precession; ii) disk precession and warping around the black hole; iii) earlier saturation of the Papaloizou-Pringle instability compared to aligned/antialigned systems, although with a shorter mode growth timescale; iv) acquisition of a small black-hole kick velocity; v) significant gravitational wave emission via various modes beyond, but as strong as, the typical $(2,2)$ mode; and vi) the possibility of a broad alignment of the angular momentum of the disk with the black hole spin. This alignment is not related to the Bardeen-Petterson effect and resembles a solid body rotation. Our simulations suggest that any electromagnetic luminosity from our models may power relativistic jets, such as those characterizing short gamma-ray bursts. Depending on the black hole-disk system scale the gravitational waves may be detected by LIGO/Virgo, LISA and/or other laser interferometers.