吸积盘中心黑洞的熵变与 B-Z 过程

分别在薄盘和厚盘两种情况下，详细讨论了纯吸积过程和Ｂ－Ｚ过程中吸积盘中心黑洞的熵变．结果表明，中心黑洞各参量在Ｂ－Ｚ过程中的变化率与在纯吸积过程中的变化率之差与盘结构无关，而且与Ｂ－Ｚ过程的辐射功率成正比．在Ｂ－Ｚ过程中黑洞熵的变化率总是大于纯吸积过程中黑洞熵的变化率，二者之差来自中心黑洞延伸视界上的耗散功率．此外，还讨论了黑洞热力学定律在上述盘吸积过程中的有效性．

Entropy Change of Central Black Holes of Accretion Disks and B Z Process

Entropy change of central black holes of accretion disks is investigated in detail in two cases: thin disks and thick disks. It is shown that the difference between the rate of change of parameters of the central black hole in the B Z process and that in a pure accretion process is independent of disk structure, and the difference is proportional to the radiation power of the B Z process. The rate of change of black hole entropy in the B Z process is always greater than that in a pure accretion process, and the difference of the two rates arises from the power dissipated in the stretched horizon of the central black hole. In addition, the validity of black hole thermodynamics in above disk accretion processes is discussed in the paper.