Islands and mixed states in closed universes
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Publication:1981429
DOI10.1007/JHEP07(2021)022zbMATH Open1468.83068arXiv2103.14364WikidataQ125127358 ScholiaQ125127358MaRDI QIDQ1981429
Author name not available (Why is that?)
Publication date: 3 September 2021
Published in: (Search for Journal in Brave)
Abstract: We investigate the appearance of islands when a closed universe with gravity is entangled with a non-gravitating quantum system. We use braneworlds in three-dimensional multiboundary wormhole geometries as a model to explore what happens when the non-gravitating system has several components. The braneworld can be either completely contained in the entanglement wedge of one of the non-gravitating systems or split between them. In the former case, entanglement with the other system leads to a mixed state in the closed universe, unlike in simpler setups with a single quantum system, where the closed universe was necessarily in a pure state. We show that the entropy of this mixed state is bounded by half of the coarse-grained entropy of the effective theory on the braneworld.
Full work available at URL: https://arxiv.org/abs/2103.14364
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