Entanglement entropy of asymptotically flat non-extremal and extremal black holes with an island
| Autor: | Won-Tae Kim, Mungon Nam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
High Energy Physics - Theory
Physics Physics and Astronomy (miscellaneous) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Boundary (topology) General Relativity and Quantum Cosmology (gr-qc) Quantum entanglement QC770-798 Curvature Astrophysics General Relativity and Quantum Cosmology Black hole QB460-466 Entropy (classical thermodynamics) Singularity High Energy Physics - Theory (hep-th) Nuclear and particle physics. Atomic energy. Radioactivity Extremal black hole Engineering (miscellaneous) Schwarzschild radius Mathematical physics |
| Zdroj: | European Physical Journal C: Particles and Fields, Vol 81, Iss 10, Pp 1-10 (2021) European Physical Journal |
| ISSN: | 1434-6052 1434-6044 |
| Popis: | The island rule for the entanglement entropy is applied to an eternal Reissner-Nordstr\"om black hole. The key ingredient is that the black hole is assumed to be in thermal equilibrium with a heat bath of an arbitrary temperature and so the generalized entropy is treated as being off-shell. Taking the on-shell condition to the off-shell generalized entropy, we find the generalized entropy and then obtain the entanglement entropy following the island rule. For the non-extremal black hole, the entanglement entropy grows linearly in time and can be saturated after the Page time as expected. The entanglement entropy also has a well-defined Schwarzschild limit. In the extremal black hole, the island prescription provides a logarithmically growing entanglement entropy in time and a constant entanglement entropy after the Page time. In the extremal black hole, the boundary of the island hits the curvature singularity where the semi-classical approximations appear invalid. To avoid encountering the curvature singularity, we apply this procedure to the Hayward black hole regular at the origin. Consequently, the presence of the island in extremal black holes can provide a finite entanglement entropy, which might imply non-trivial vacuum configurations of extremal black holes. Comment: 20 pages, 4 figures, references and comments added |
| Databáze: | OpenAIRE |
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