We discuss massive scalar perturbations of a two-dimensional dilaton black hole. We employ a Pauli-Villars reqularization scheme to calculate the effect of the scalar perturbation on the Bekenstein-Hawking entropy. By concentrating on the dynamics of the scalar field near the horizon, we argue that quantum effects alter the effective potential. We calculate the two-point function explicitly and show that it exhibits Poincare recurrences.
@article{arxiv.hep-th/0601186,
title = {Unitary evolution of perturbations of a two-dimensional black hole},
author = {George Siopsis},
journal= {arXiv preprint arXiv:hep-th/0601186},
year = {2008}
}