Fallows, Seamus and Ross, Simon F. (2021) 'Islands and mixed states in closed universes.', Journal of high energy physics., 2021 (7). 022.
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.
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|Publisher Web site:||https://doi.org/10.1007/JHEP07(2021)022|
|Publisher statement:||Open Access . This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.|
|Date accepted:||17 June 2021|
|Date deposited:||21 October 2021|
|Date of first online publication:||06 July 2021|
|Date first made open access:||21 October 2021|
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