Black Holes in the 3D Higher Spin Theory and Their Quasi Normal Modes
  We present a class of 3D Black Holes based on flat connections which are polynomials in the BTZ $hs(\lambda) \times hs(\lambda)$-valued connection. We solve analytically the fluctuation equations of matter in their background and find the spectrum of their Quasi Normal Modes. We analyze the bulk to boundary two-point functions. We also relate our results and those arising in other backgrounds discussed recently in the literature on the subject. 
Alejandro Cabo-Bizet, Edi Gava, V. I. Giraldo-Rivera, K.S. Narain
hep-th