Lombardo, Fernando C.Mazzitelli, Francisco D.Russo, J. G. (Jorge Guillermo)2010-05-062010-05-0619990556-2821https://hdl.handle.net/2445/12471We clarify some issues related to the evaluation of the mean value of the energy-momentum tensor for quantum scalar fields coupled to the dilaton field in two-dimensional gravity. Because of this coupling, the energy-momentum tensor for matter is not conserved and therefore it is not determined by the trace anomaly. We discuss different approximations for the calculation of the energy-momentum tensor and show how to obtain the correct amount of Hawking radiation. We also compute cosmological particle creation and quantum corrections to the Newtonian potential.8 p.application/pdfeng(c) The American Physical Society, 1999Relativitat general (Física)GravitacióGeneral relativity (Physics)Gravitationinfo:eu-repo/semantics/article512100info:eu-repo/semantics/openAccess