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Ephemeral islands, plunging quantum extremal surfaces and BCFT channels

Timothy Hollowood Orcid Logo, Prem Kumar Orcid Logo, Andrea Legramandi, Neil Talwar

Journal of High Energy Physics, Volume: 2022, Issue: 1

Swansea University Authors: Timothy Hollowood Orcid Logo, Prem Kumar Orcid Logo, Andrea Legramandi, Neil Talwar

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DOI (Published version): 10.1007/jhep01(2022)078

Abstract

We consider entanglement entropies of finite spatial intervals in Minkowski radiation baths coupled to the eternal black hole in JT gravity, and the related problem involving free fermion BCFT in the thermofield double state. We show that the non- monotonic entropy evolution in the black hole proble...

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Published in: Journal of High Energy Physics
ISSN: 1029-8479
Published: Springer Science and Business Media LLC 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa58009
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spelling 2022-10-25T14:12:36.8986702 v2 58009 2021-09-22 Ephemeral islands, plunging quantum extremal surfaces and BCFT channels ea9ca59fc948276ff2ab547e91bdf0c2 0000-0002-3258-320X Timothy Hollowood Timothy Hollowood true false 087fd097167d724ce1b13cb285741ef5 0000-0003-0867-4213 Prem Kumar Prem Kumar true false 4cfd9e6d370d95652ab4208b6b83607e Andrea Legramandi Andrea Legramandi true false 1573a54f803531a7648ae7fb667e5a80 Neil Talwar Neil Talwar true false 2021-09-22 SPH We consider entanglement entropies of finite spatial intervals in Minkowski radiation baths coupled to the eternal black hole in JT gravity, and the related problem involving free fermion BCFT in the thermofield double state. We show that the non- monotonic entropy evolution in the black hole problem precisely matches that of the free fermion theory in a high temperature limit, and the results have the form expected for CFTs with quasiparticle description. Both exhibit rich behaviour that involves at intermediate times, an entropy saddle with an island in the former case, and in the latter a special class of disconnected OPE channels. The quantum extremal surfaces start inside the horizon, but can emerge from and plunge back inside as time evolves, accompanied by a characteristic dip in the entropy also seen in the free fermion BCFT. Finally an entropy equilibrium is reached with a no-island saddle. Journal Article Journal of High Energy Physics 2022 1 Springer Science and Business Media LLC 1029-8479 Black Holes; Conformal Field Theory; AdS-CFT Correspondence 14 1 2022 2022-01-14 10.1007/jhep01(2022)078 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University TJH, AL and SPK acknowledge support from STFC grant ST/T000813/1. NT acknowledges the support of an STFC Studentship. 2022-10-25T14:12:36.8986702 2021-09-22T15:08:00.6983220 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Timothy Hollowood 0000-0002-3258-320X 1 Prem Kumar 0000-0003-0867-4213 2 Andrea Legramandi 3 Neil Talwar 4 58009__22151__da4a2cb01c1c49959799e713347801a3.pdf cbe041f4-be22-410c-8ff1-3c3248f85006.pdf 2022-01-15T23:30:29.8939414 Output 639214 application/pdf Version of Record true Copyright: The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0) true eng http://creativecommons.org/licenses/by/4.0/
title Ephemeral islands, plunging quantum extremal surfaces and BCFT channels
spellingShingle Ephemeral islands, plunging quantum extremal surfaces and BCFT channels
Timothy Hollowood
Prem Kumar
Andrea Legramandi
Neil Talwar
title_short Ephemeral islands, plunging quantum extremal surfaces and BCFT channels
title_full Ephemeral islands, plunging quantum extremal surfaces and BCFT channels
title_fullStr Ephemeral islands, plunging quantum extremal surfaces and BCFT channels
title_full_unstemmed Ephemeral islands, plunging quantum extremal surfaces and BCFT channels
title_sort Ephemeral islands, plunging quantum extremal surfaces and BCFT channels
author_id_str_mv ea9ca59fc948276ff2ab547e91bdf0c2
087fd097167d724ce1b13cb285741ef5
4cfd9e6d370d95652ab4208b6b83607e
1573a54f803531a7648ae7fb667e5a80
author_id_fullname_str_mv ea9ca59fc948276ff2ab547e91bdf0c2_***_Timothy Hollowood
087fd097167d724ce1b13cb285741ef5_***_Prem Kumar
4cfd9e6d370d95652ab4208b6b83607e_***_Andrea Legramandi
1573a54f803531a7648ae7fb667e5a80_***_Neil Talwar
author Timothy Hollowood
Prem Kumar
Andrea Legramandi
Neil Talwar
author2 Timothy Hollowood
Prem Kumar
Andrea Legramandi
Neil Talwar
format Journal article
container_title Journal of High Energy Physics
container_volume 2022
container_issue 1
publishDate 2022
institution Swansea University
issn 1029-8479
doi_str_mv 10.1007/jhep01(2022)078
publisher Springer Science and Business Media LLC
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
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description We consider entanglement entropies of finite spatial intervals in Minkowski radiation baths coupled to the eternal black hole in JT gravity, and the related problem involving free fermion BCFT in the thermofield double state. We show that the non- monotonic entropy evolution in the black hole problem precisely matches that of the free fermion theory in a high temperature limit, and the results have the form expected for CFTs with quasiparticle description. Both exhibit rich behaviour that involves at intermediate times, an entropy saddle with an island in the former case, and in the latter a special class of disconnected OPE channels. The quantum extremal surfaces start inside the horizon, but can emerge from and plunge back inside as time evolves, accompanied by a characteristic dip in the entropy also seen in the free fermion BCFT. Finally an entropy equilibrium is reached with a no-island saddle.
published_date 2022-01-14T04:14:11Z
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