标题： 从普遍协变性出发的防火墙 显示英文标题

标题： Firewalls From General Covariance

摘要： 我将“视界正常性”定义为半经典引力和有效场论（SGEFT）对于接近或穿越黑洞视界的观察者的描述的近似有效性。 如果黑洞会返回信息，那么在某些全局状态下，视界正常性必须显著失败。 诸如ER=EPR和非等距映射的提议认为，只要霍金辐射保持在计算上简单的状态，视界正常性就会持续。 在这里，我认为状态依赖的视界正常性——无论底层机制如何，也无论被断言为保证正常性的辐射态类别如何——都需要在远离黑洞的地方出现广义协变性的崩溃，否则视界正常性将取决于外部的无限未来。 这是因为辐射可以在不同事件中处于不同状态，这些事件都与涉及正常性的视界穿越事件类空。 我讨论了AdS/CFT中的一个相关效应，并认为通过时间折叠来解决它在此处没有帮助。 显示英文摘要

摘要： I define "horizon normalcy" as the approximate validity of Semiclassical Gravity and Effective Field Theory (SGEFT), for the description of observers that approach or cross a black hole horizon. If black holes return information, then horizon normalcy must fail substantially, at least in some global states. Proposals such as ER=EPR and nonisometric maps assert that horizon normalcy persists, so long as the Hawking radiation remains in a computationally simple state. Here I argue that state-dependent horizon normalcy - independently of the underlying mechanism, and independently of the class of radiation states asserted to guarantee normalcy - requires a breakdown of general covariance far from the black hole, or else horizon normalcy will depend on the infinite future of the exterior. This is because the radiation can be in different states at different events, all spacelike to the horizon crossing event whose normalcy is at stake. I discuss a related effect in AdS/CFT, and I argue that its resolution by timefolds is of no help here.