We study backreaction effects in two-dimensional dilaton gravity. The backreaction comes from an $R^2$ term which is a part of the one-loop effective action arising from massive scalar field quantization in a certain approximation. The peculiarity of this term is that it does not contribute to the Hawking radiation of the classical black hole solution of the field equations. In the static case we examine the horizon and the physical singularity of the new black hole solutions. Studying the possibility of time dependence we see the generation of a new singularity. The particular solution found still has the structure of a black hole, indicating that non-thermal effects cannot lead, at least in this approximation, to black hole evaporation.
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机译：我们研究二维膨胀引力中的后反应效应。反向反应来自$ R ^ 2 $项，这是单环有效操作的一部分，该有效操作是由大规模标量场量化以某种近似值产生的。该术语的奇特之处在于它对场方程的经典黑洞解的霍金辐射没有贡献。在静态情况下，我们检查了新黑洞解决方案的视界和物理奇点。在研究时间依赖性的可能性时，我们看到了新奇点的产生。发现的特定解决方案仍然具有黑洞的结构，这表明至少在这种近似下，非热效应无法导致黑洞蒸发。
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