Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1991-11-28
Phys.Rev.D45:1005-1009,1992
Physics
High Energy Physics
High Energy Physics - Theory
14 pages
Scientific paper
10.1103/PhysRevD.45.R1005
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.
Callan Curtin
Giddings Steve
Harvey Jack
Strominger Andrew
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