The conical singularity method and the energy-momentum tensor near the black hole horizon using the Kruskal coordinates

摘要

We apply the conical singularity method to the two dimensional version of theSchwarzschild metric to obtain the Kruskal coordinates of the black hole in avery simple and direct way. Then we make use of this metric in an approximatedversion and calculate the expected value of energy-momentum tensor of amassless quantum field near the horizon, resulting in regular expressions forits components.