String scattering off the (2+1)-dimensional rotationg black hole
  The $SL(2, R)/Z$ WZW orbifold describes the (2+1)-dimensional black hole which approaches anti-de~Sitter space asymptotically. We study the $1 \rightarrow 1$ tachyon scattering off the rotating black hole background and calculate the Hawking temperature using the Bogoliubov transformation. 
Makoto Natsuume, Norisuke Sakai, and Masamichi Sato (Tokyo Institute   of Technology)