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考虑Schwarzschild和Kerr-Newman黑洞的度规场和电磁场张量,研究了落入黑洞的物理粒子.得出结论:任何物理粒子落入Schwarzschild或Kerr-Newman黑洞的演化过程要满足δA≥0和δκ≤0两个条件,得出了不能通过有限次操作使Kerr-Newman黑洞的温度降低到绝对零度,从而变成极端Kerr-Newman黑洞,刚好与第三定律相符.还讨论了Kerr-Newman黑洞趋于极端情况时,其面积的变化趋势,提出了黑洞负热容的影响以及熵的重整化问题.A falling-in physical particle in metric and electromagnetic tensor field of Schwarzschild and Kerr-Newman black hole is studied.It is concluded that the physical particle will not make the outer horizon smaller.This is coincident with the area theorem.It is well known that δA≥0 andδκ≤0 are the necessary condition for changing from nonextremal to extremal Kerr-Newman black hole.We demonstrate that the surface gravity (temperature) of a Kerr-Newman black hole cannot be reduced to zero in a finite sequence of physical interactions.This is coincident with the third law of black hole thermodynamics.We also consider the trend of area change in the evolution of near-extremal black hole.The effect of negative heat capacity and the entropy renormalization are discussed.
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