Highly Damped Quasinormal Modes and the Small Scale Structure of Quantum   Corrected Black Hole Exteriors
  Quasinormal modes provide valuable information about the structure of spacetime outside a black hole. There is also a conjectured relationship between the highly damped quasinormal modes and the semi-classical spectrum of the horizon area/entropy. In this paper, we show that for spacetimes characterized by more than one scale, the "infinitely damped" modes in principle probe the structure of spacetime outside the horizon at the shortest length scales. We demonstrate this with the calculation of the highly damped quasinormal modes of the non-singular, single horizon, quantum corrected black hole derived in [14]. 
James Babb, Ramin G. Daghigh and Gabor Kunstatter
gr-qc