标题： 非定常圆盘和不稳定性 显示英文标题

标题： Non-Stationary Discs and Instabilities

摘要： 我们回顾了目前关于紧致天体周围吸积盘中的热不稳定性和粘性不稳定性知识。我们从基于解析粘性假设的经典盘模型开始，讨论物理上的不确定性，并探讨盘演化的时间依赖解。我们还回顾了导致爆发型矮新星和X射线双星系统的电离不稳定性，包括α模型与这些系统观测特征之间的一些详细比较。然后，我们回顾了基于磁场介导角动量传输的现代理论工作，特别是通过局部和全局的磁流体力学过程计算机模拟所获得的知识。我们讨论了磁流体力学如何可能改变我们对白矮星和X射线双星系统爆发的理解。最后，我们转向预测存在于黑洞和中子星盘内辐射压力主导区域的假定热/粘性不稳定性，这似乎与黑洞X射线双星高/软态的观测稳定性相矛盾。 显示英文摘要

摘要： We review our current knowledge of thermal and viscous instabilities in accretion discs around compact objects. We begin with classical disc models based on analytic viscosity prescriptions, discussing physical uncertainties and exploring time-dependent solutions of disc evolution. We also review the ionization instability responsible for outbursting dwarf nova and X-ray binary systems, including some detailed comparisons between alpha-based models and the observed characteristics of these systems. We then review modern theoretical work based on ideas around angular momentum transport mediated by magnetic fields, focusing in particular on knowledge gained through local and global computer simulations of MHD processes in discs. We discuss how MHD may alter our understanding of outbursts in white dwarf and X-ray binary systems. Finally, we turn to the putative thermal/viscous instabilities that were predicted to exist in the inner, radiation pressure-dominated regions of black hole and neutron star discs, in apparent contradiction to the observed stability of the high/soft state in black hole X-ray binaries.