Backreaction Effects in the Two-Dimensional Dilaton Gravity

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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16 pages,LATEX, four figures available upon request

Scientific paper

10.1103/PhysRevD.54.6226

In this work we find static black hole solutions in the context of the two-dimensional dilaton gravity, which is modified by the addition of an $R^2$ term. This term arises from the one-loop effective action of a massive scalar field in its large mass expansion. The basic feature of this term is that it does not contribute to the Hawking radiation of the classical black hole backgrounds of the model. From this point of view a class of the solutions derived are interpreted as describing backreaction effects. In particular it is argued that evolution of a black hole via non-thermal signals is possible. Nevertheless this evolution seems to be 'soft', in the sense that it does not lead to the evaporation of a black hole, leaving the Hawking radiation as the dominant mechanism for this process.

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