标题： 黑洞、空腔和闪烁岛屿 显示英文标题

标题： Black Holes, Cavities and Blinking Islands

摘要： 在腔体内放置一个黑洞被认为是研究引力不同尺度的自然方法，涉及热力学不稳定性以及引力有效理论的问题。 在本文中，我们考虑在腔体内史瓦茨希尔德黑洞的双侧推广中纠缠熵和纠缠岛屿的演化。 在永恒黑洞外部引入反射边界来调节霍金辐射的红外模式，并发现纠缠熵会达到某个常数值。 这个值可能低于黑洞热力学熵，因此不会导致页面信息悖论的形成。 关于纠缠岛屿，我们发现由边界存在引起的普遍效应，我们称之为“闪烁岛屿”——在一段时间内，纠缠岛屿不可避免地消失，从而导致短时间的信息悖论。 显示英文摘要

摘要： Placing a black hole in a cavity is known to be a natural way to study different scales in gravity, issues related to the thermodynamic instability and gravity effective theories. In this paper, we consider the evolution of the entanglement entropy and entanglement islands in the two-sided generalization of the Schwarzschild black hole in a cavity. Introducing a reflecting boundary in the eternal black exteriors we regulate infrared modes of Hawking radiation and find that entanglement entropy saturates at some constant value. This value could be lower than black hole thermodynamic entropy, thus not leading to Page formulation of information paradox. Concerning the entanglement islands, we find a universal effect induced by the boundary presence, which we call ``blinking island" -- for some time the entanglement island inevitably disappears, thus leading to a short-time information paradox.