Head-on collision与黑洞的并合熵--对霍金不等式的再认识
Head-on collision and merging entropy of black holes: reconsideration of Hawking's inequality
摘要：
我们计算了在黑洞的正面碰撞中有多少能量可以转化为引力辐射。从黑洞热力学的观点出发，结合碰撞黑洞的合并熵，用黑洞视界面积定理估计了它。然后我们得到了引力辐射能量比的一个上界，这个上界比Hawking最初导出的上界要小。这一估计与低能和高能迎头碰撞的数值研究结果并不矛盾，这一事实意味着合并黑洞的热力学需要合并熵的贡献。
英文摘要：
We evaluate how much energy can be converted into gravitational radiation in head-on collision of black holes. We estimate it by the area theorem of black hole horizon incorporating merging entropy of colliding black holes from a viewpoint of black hole thermodynamics. Then we obtain an upper bound of energy ratio of the gravitational radiation which is smaller than the upper bound originally derived by Hawking. The fact that this estimation is not inconsistent with the results of both numerical investigations in low- and high-energy head-on collision implies that thermodynamics of coalescing black holes requires the contribution of the merging entropy.
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