Don N. Page: Information in Black Hole Radiation. In: Physical Review Letters. 71. Jahrgang, Nr.23, 6. Dezember 1993, S.3743–3746, doi:10.1103/PhysRevLett.71.3743, arxiv:hep-th/9306083 (englisch).
Ahmed Almheiri, Thomas Hartman, Juan Maldacena, Edgar Shaghoulian, Amirhossein Tajdini: The entropy of Hawking radiation. In: Reviews of Modern Physics. 93. Jahrgang, Nr.3, 21. Juli 2021, S.035002, doi:10.1103/RevModPhys.93.035002, arxiv:2006.06872 (englisch): “Glossary. Page curve: Consider a spacetime with a black hole formed by the collapse of a pure state. Surround the black hole by an imaginary sphere whose radius is a few Schwarzschild radii. The Page curve is a plot of the fine-grained entropy outside of this imaginary sphere, where we subtract the contribution of the vacuum. Since the black hole Hawking radiates and the Hawking quanta enter this faraway region, this computes the fine-grained entropy of Hawking radiation as a function of time. Notice that the regions inside and outside the imaginary sphere are open systems. The curve begins at zero when no Hawking quanta have entered the exterior region, and ends at zero when the black hole has completely evaporated and all of the Hawking quanta are in the exterior region. The “Page time” corresponds to the turnover point of the curve.”
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Don N. Page: Information in Black Hole Radiation. In: Physical Review Letters. 71. Jahrgang, Nr.23, 6. Dezember 1993, S.3743–3746, doi:10.1103/PhysRevLett.71.3743, arxiv:hep-th/9306083 (englisch).
Ahmed Almheiri, Thomas Hartman, Juan Maldacena, Edgar Shaghoulian, Amirhossein Tajdini: The entropy of Hawking radiation. In: Reviews of Modern Physics. 93. Jahrgang, Nr.3, 21. Juli 2021, S.035002, doi:10.1103/RevModPhys.93.035002, arxiv:2006.06872 (englisch): “Glossary. Page curve: Consider a spacetime with a black hole formed by the collapse of a pure state. Surround the black hole by an imaginary sphere whose radius is a few Schwarzschild radii. The Page curve is a plot of the fine-grained entropy outside of this imaginary sphere, where we subtract the contribution of the vacuum. Since the black hole Hawking radiates and the Hawking quanta enter this faraway region, this computes the fine-grained entropy of Hawking radiation as a function of time. Notice that the regions inside and outside the imaginary sphere are open systems. The curve begins at zero when no Hawking quanta have entered the exterior region, and ends at zero when the black hole has completely evaporated and all of the Hawking quanta are in the exterior region. The “Page time” corresponds to the turnover point of the curve.”
