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由球对称引力坍缩所形成的黑洞是一种最简单的黑洞,它的解可用黑洞的质量M这一个参量来描述,这种黑洞叫史瓦西黑洞;由施转物体引力坍缩所形成的黑洞可以用质量M和角动量J来描述,这种黑洞叫克尔黑洞;由质量M、电荷Q和角动量J来描述的黑洞叫克尔——纽曼黑洞。对于一个旋转的黑洞(克尔黑洞),可以想办法将其很大一部分质量转换为能量,最后把这部分能量从黑洞中提取出来,这就是从黑洞提取能量的问题。
The black hole formed by the spherical symmetric gravity collapse is the simplest black hole whose solution can be described by a parameter of the mass of the black hole called Schwarzschild Black Hole. The black hole formed by the gravitational collapse of the rotating object It can be described by mass M and angular momentum J, which is called Kerr black hole. The black hole described by mass M, charge Q and angular momentum J is called Kerr-Newman black hole. For a rotating black hole (Kerr black hole), you can find a way to convert a large part of its mass into energy, and finally extract this part of the energy from the black hole. This is the problem of extracting energy from a black hole.