Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-07-18
Phys.Lett. B387 (1996) 51-56
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX, psfig.sty. 10 pages. 3 figures (included as PS files)
Scientific paper
10.1016/0370-2693(96)01004-0
We study the evaporation process of 2D black holes in thermal equilibrium when the incoming radiation is turned off. Our analysis is based on two different classes of 2D dilaton gravity models which are exactly solvable in the semiclassical aproximation including back-reaction. We consider a one parameter family of models interpolating between the Russo-Susskind-Thorlacius and Bose-Parker-Peleg models. We find that the end-state geometry is the same as the one coming from an evaporating black hole formed by gravitational collapse. We also study the quantum evolution of black holes arising in a model with classical action $S = {1\over2\pi} \int d^2x \sqrt{-g} (R\phi + 4\lambda^2e^{\beta\phi})$. The black hole temperature is proportional to the mass and the exact semiclassical solution indicates that these black holes never disappear completely.
Cruz Jesus
Navarro-Salas Jose
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