Observations of Hawking radiation: the Page curve and baby universes
Observations of Hawking radiation: the Page curve and baby universes
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DOI：
10.1007/jhep04(2021)272
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发表时间：
2020-10
影响因子：
5.4
通讯作者：
D. Marolf;Henry Maxfield
中科院分区：
文献类型：
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作者：
D. Marolf;Henry Maxfield
我们以一种强调熵、洛伦兹签名描述和渐近平坦时空的操作定义概念的方式重新阐述了最近对黑洞信息的见解。在复制虫洞的帮助下，我们发现渐近观察者的实验与黑洞作为幺正量子系统是一致的，状态密度由贝肯斯坦-霍金公式给出。然而，这是以与婴儿宇宙状态相关的超选择部门为代价的。Polchinski和Strominger在1994年研究的时空提供了相关概念和技术的简单说明，我们认为它们是复制虫洞的自然后期外推。这项工作的目的是自给自足，特别是，读者谁还没有掌握上述思想的早期公式访问。
We reformulate recent insights into black hole information in a manner emphasizing operationally-defined notions of entropy, Lorentz-signature descriptions, and asymptotically flat spacetimes. With the help of replica wormholes, we find that experiments of asymptotic observers are consistent with black holes as unitary quantum systems, with density of states given by the Bekenstein-Hawking formula. However, this comes at the cost of superselection sectors associated with the state of baby universes. Spacetimes studied by Polchinski and Strominger in 1994 provide a simple illustration of the associated concepts and techniques, and we argue them to be a natural late-time extrapolation of replica wormholes. The work aims to be self-contained and, in particular, to be accessible to readers who have not yet mastered earlier formulations of the ideas above.