Work of D. S. A., I. Ya. A. and T. A. R., which consisted in designing the project, calculating entanglement entropy and study of infrared anomalies in the context of entanglement islands (Chapters 1–3 of this paper) is supported by the Russian Science Foundation (project 20-12-00200, Steklov Mathematical Institute). D. S. A., A. I. B. and V. V. P. are supported by the Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS” (chapters 4–5). The work was performed at
Steklov International Mathematical Center and supported (chapters 4-5) by the Ministry of Science and Higher Education of the Russian Federation (Agreement No. 075-15-2019-1614).
Received: 23.05.2023 Accepted: 19.07.2023
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