黑洞吸积盘内边缘半径的演化与Blandford-Znajek过程

Evolution of the Inner Radius of Black-Hole Accretion Disk and the Blandford-Znajek Process

分别在薄盘和厚盘两种情况下，详细讨论了Ｂｌａｎｄｆｏｒｄ－Ｚｎａｊｅｋ过程对黑洞吸积盘内边缘半径演化的影响．结果表明，中心黑洞的无量纲角动量演化到某一临界值时；黑洞吸积盘的内边缘半径的变化率将由负交正．尽管盘的内边缘半径的极小值出现在Ｋｅｒｒ黑洞的能层的外边界上，但内边缘半径仍不可避免地会演化到Ｋｅｒｒ黑洞的能层中去．

he effect of the Blandford-Znajek process on the evolution of the inner radius ofblack-hole accretion disk is investigated in detail separately for thin and thick disks. It isshown that the rate of change of the inner radius of will change from negative values intopositive values when the dimensionless angular momentum of the central black hole evolvespast a critical value. Although the minimum value of the inner radius appears at the outerboundary of the ergosphere of the Kerr black hole, the inner radius will inevitably evolveinto the ergosphere.