Information is Not Lost in the Evaporation of 2-dimensional Black Holes

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Ashtekar, Abhay
Taveras, Victor
Varadarajan, Madhavan
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Abstract
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We analyze Hawking evaporation of the Callen-Giddings-Harvey-Strominger (CGHS) black holes from a quantum geometry perspective and show that information is not lost, primarily because the quantum space-time is sufficiently larger than the classical. Using suitable approximations to extract physics from quantum space-times we establish that: i)future null infinity of the quantum space-time is sufficiently long for the the past vacuum to evolve to a pure state in the future; ii) this state has a finite norm in the future Fock space; and iii) all the information comes out at future infinity; there are no remnants.
Comment: 4 pages, 2 figures
Keywords
General Relativity and Quantum Cosmology, High Energy Physics - Theory
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