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arXiv 2107.03031hep-th
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荷电Dilaton黑洞中的Page曲线和岛

Page Curves and Islands in Charged Dilaton Black Holes

Ming-Hui Yu, Xian-Hui Ge

摘要:

利用“量子极值曲面”方法研究了黑洞上四维渐近平坦永恒Garfinkle-Horowitz-Strominger系统中的Page曲线.结果表明,在没有岛的情况下,霍金辐射的纠缠熵与时间成正比,并且在后期发散。当考虑岛的出现时,霍金辐射的纠缠熵停止增长并最终达到饱和值,该值是Bekenstein-Hawking熵的两倍,这与永恒黑洞的冯诺伊曼熵的有限性相一致.此外,我们还讨论了参数$n$和电荷$Q$对寻呼时间的影响。当电荷$Q$与黑洞质量$M$之比足够小时,$n$对Page时间的影响可以忽略不计,但电荷$Q$对Page时间有显著影响.重要的是,在极端情况下,佩奇时间变得发散或消失,其中半经典理论需要进一步研究。

英文摘要:

We study the Page curve in the four dimensional asymptotically flat eternal Garfinkle-Horowitz-Strominger dilaton black holes by applying the "quantum extremal surface" prescription. The results demonstrate that without island, the entanglement entropy of Hawking radiation is proportional to time and divergent at late times. While taking account of the emergence of the island extending slightly outside the event horizon, the entanglement entropy of Hawking radiation stops growing and eventually reaches a saturation value, which is twice of the Bekenstein-Hawking entropy and consistent with the finiteness of the von Neumann entropy of eternal black holes. Moreover, we discuss the impact of the parameter $n$ and charge $Q$ on the Page time. The influence of $n$ on it can neglected when the ratio of the charge $Q$ to the black hole mass $M$ is sufficiently small, but the charge $Q$ has a significant impact on Page time. Importantly, at the extremal case, the Page time becomes divergent or vanishing, in which the semiclassical theory needs further investigation.

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