Scalar Perturbation of Black Holes in (2+1)-Dimensional Dilaton Gravity
  Scalar perturbation represented by the Klein-Gordon field equation of the system of black holes in 2+1 dimensional Static charged dilaton gravity proposed by Chan and Mann is investigated analytically. The radial equation is analyzed near horizon and at the asymptotic region to show the absence of superradiance instability. 
Biplab Raychaudhuri and Kshounish Guha
gr-qc