Truncated Heat Kernel and One-Loop Determinants for the BTZ Geometry
  There is a special relation between the spectrum and the {\it truncated} heat kernel of the Euclidean BTZ black hole with the Patterson-Selberg zeta function. Using an orbifold description of this relation we calculate the on-shell corrections of the gravitational quantum fluctuations. 
A. A. Bytsenko (DF/Uel) and M. E. X. Guimaraes (IF/Uff)