破裂盘：吸积盘中的翘曲传播
Broken discs: warp propagation in accretion discs
摘要：
我们模拟了旋转黑洞周围吸积盘的粘性演化。一般来说，任何这样的盘都是未对准的，并且由于透镜-瑟林效应而翘曲。与以往的研究不同，我们使用有效的粘度约束，以符合内部流体动力学的光盘。我们发现，非线性流体的影响，这减少了有效的翘曲区域的粘度，可以促进破碎的光盘成两个不同的平面。当Shakura & Sunyaev无量纲粘度参数α <~ 0.3且盘和孔之间的初始未对准角度>~ 45度时，会发生这种情况。断裂可以是长期存在的特征，在通常的对准时间尺度上在盘中向外传播，之后盘与孔完全共同对准或反向对准。在我们知道外吸积盘相对于视线倾斜的系统中，例如某些X射线双星：内盘，以及任何喷流，可能相对于轨道平面明显不对齐。
英文摘要：
We simulate the viscous evolution of an accretion disc around a spinning black hole. In general any such disc is misaligned, and warped by the Lense-Thirring effect. Unlike previous studies we use effective viscosities constrained to be consistent with the internal fluid dynamics of the disc. We find that nonlinear fluid effects, which reduce the effective viscosities in warped regions, can promote the breaking of the disc into two distinct planes. This occurs when the Shakura & Sunyaev dimensionless viscosity parameter alpha is <~ 0.3 and the initial angle of misalignment between the disc and hole is >~ 45 degrees. The break can be a long-lived feature, propagating outwards in the disc on the usual alignment timescale, after which the disc is fully co- or counter-aligned with the hole. Such a break in the disc may be significant in systems where we know the inclination of the outer accretion disc to the line of sight, such as some X-ray binaries: the inner disc, and so any jets, may be noticeably misaligned with respect to the orbital plane.
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。
