具有有限ISCO应力的相对论薄圆盘的演化：II。晚期行为
Evolution of relativistic thin discs with a finite ISCO stress: II. Late time behaviour
摘要：
我们提出了解决方案的相对论薄光盘演化方程使用修改后的描述的平均流体流动的光盘。该模型考虑到在最里面的光盘区域的亚圆速度的影响，并解决了其他不可持续的行为，在简单的有限ISCO应力光盘模型。我们表明，一个相对论薄盘的行为与有限的ISCO应力演变是由三个不同的阶段，加入通常不同的有限和消失的ISCO应力的解决方案到一个完全连续的模型参数化。我们的模型最重要的预测是存在一个中间阶段的“停滞吸积”，由一个单一的无量纲参数控制。这个演化阶段的标志似乎已经在GRMHD模拟以及潮汐破裂事件的后期X射线观测中看到，但需要专门的模拟和扩展观测才能更深入地了解。
英文摘要：
We present solutions to the relativistic thin disc evolutionary equation using a modified description of the mean fluid flow within the disc. The model takes into account the effects of sub-circular velocities in the innermost disc regions, and resolves otherwise unsustainable behaviour present in simple finite ISCO stress disc models. We show that the behaviour of a relativistic thin disc evolving with a finite ISCO stress is comprised of three distinct stages which join the ordinarily distinct finite and vanishing ISCO stress solutions into a fully continuous model parameterisation. The most important prediction of our model is the existence of an intermediate stage of "stalled accretion", controlled by a single dimensionless parameter. The hallmarks of this evolutionary phase appear to have been seen in GRMHD simulations as well as in the late time X-ray observations of tidal disruption events, but dedicated simulations and extended observations are needed for a deeper understanding.
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