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      Evanescent Black Holes

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          Abstract

          A renormalizable theory of quantum gravity coupled to a dilaton and conformal matter in two space-time dimensions is analyzed. The theory is shown to be exactly solvable classically. Included among the exact classical solutions are configurations describing the formation of a black hole by collapsing matter. The problem of Hawking radiation and backreaction of the metric is analyzed to leading order in a \(1/N\) expansion, where \(N\) is the number of matter fields. The results suggest that the collapsing matter radiates away all of its energy before an event horizon has a chance to form, and black holes thereby disappear from the quantum mechanical spectrum. It is argued that the matter asymptotically approaches a zero-energy ``bound state'' which can carry global quantum numbers and that a unitary \(S\)-matrix including such states should exist.

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          String theory and black holes

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            Trace anomalies and the Hawking effect

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              expansion and renormalization in quantum gravity

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                Author and article information

                Journal
                27 November 1991
                Article
                10.1103/PhysRevD.45.R1005
                hep-th/9111056
                e678509c-219d-434e-87a6-d5d75fb9ff29
                History
                Custom metadata
                Phys.Rev.D45:1005-1009,1992
                14 pages
                hep-th

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