热无碰撞吸积盘中的混合粘性和磁粘性不稳定性
Hybrid viscosity and the magnetoviscous instability in hot, collisionless accretion disks
摘要：
我们的目的是说明热质子的作用，通过“混合”的粘度，这是由于重定向的质子与静态磁场扰动相互作用的磁旋转不稳定性（MRI），并建立在这种情况下，它是唯一相关的机制。最近Balbus \cite{PBM1}和Islam & Balbus \cite{PBM11}使用流体方法表明，粘性动量输运是吸积盘中MRI在宽范围参数下发展的关键。然而，他们的结果并不适用于热，对流主导的磁盘，这是无碰撞。我们开发了一个流体图片使用混合粘度机制，适用于无碰撞限制。我们证明，从这种机制所产生的粘性效应可以显着提高MRI的增长，只要等离子体$β\gapprox 80$。我们的研究结果有利于第一次直接比较热，无碰撞磁盘的磁粘不稳定性的MHD和准动力学治疗。
英文摘要：
We aim to illustrate the role of hot protons in enhancing the magnetorotational instability (MRI) via the ``hybrid'' viscosity, which is due to the redirection of protons interacting with static magnetic field perturbations, and to establish that it is the only relevant mechanism in this situation. It has recently been shown by Balbus \cite{PBM1} and Islam & Balbus \cite{PBM11} using a fluid approach that viscous momentum transport is key to the development of the MRI in accretion disks for a wide range of parameters. However, their results do not apply in hot, advection-dominated disks, which are collisionless. We develop a fluid picture using the hybrid viscosity mechanism, that applies in the collisionless limit. We demonstrate that viscous effects arising from this mechanism can significantly enhance the growth of the MRI as long as the plasma $β\gapprox 80$. Our results facilitate for the first time a direct comparison between the MHD and quasi-kinetic treatments of the magnetoviscous instability in hot, collisionless disks.
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