Position-dependent radiative transfer as a tool for studying Anderson   localization: Delay time, time-reversal and coherent backscattering
  Previous work has established that the localized regime of wave transport in open media is characterized by a position-dependent diffusion coefficient. In this work we study how the concept of position-dependent diffusion affects the delay time, the transverse confinement, the coherent backscattering, and the time reversal of waves. Definitions of energy transport velocity of localized waves are proposed. We start with a phenomenological model of radiative transfer and then present a novel perturbational approach based on the self-consistent theory of localization. The latter allows us to obtain results relevant for realistic experiments in disordered quasi-1D wave guides and 3D slabs. 
B.A. van Tiggelen, S.E. Skipetrov and J.H. Page
cond-mat.dis-nn