旋转黑洞周围的迷你圆盘
Mini-discs around spinning black holes
摘要：
在风馈双星和双星中，吸积到黑洞上形成了具有特殊性质的小旋转盘。这种"微型圆盘“在自由下落时不借助粘性而吸积，但仍然具有高辐射效率。无粘迷你盘模型以前是为非旋转黑洞构建的。我们将该模型推广到自旋黑洞的情况，计算了圆盘的结构和辐射效率，并发现它们对黑洞自旋的依赖性。如果圆盘的角动量和黑洞的角动量是反对齐的，则发生类似彭罗斯过程的流体动力学过程。
英文摘要：
Accretion onto black holes in wind-fed binaries and in collapsars forms small rotating discs with peculiar properties. Such ``mini-discs'' accrete on the free-fall time without help of viscosity and nevertheless can have a high radiative efficiency. The inviscid mini-disc model was previously constructed for a non-rotating black hole. We extend the model to the case of a spinning black hole, calculate the structure and radiative efficiency of the disc and find their dependence on the black hole spin. If the angular momenta of the disc and the black hole are anti-aligned, a hydrodynamic analog of Penrose process takes place.
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