LONG-RANGE INTENSITY CORRELATIONS IN A DISORDERED MEDIUM

We present rigorous calculations for the long-range intensity correlat ions in multiple wave scattering from a disordered medium. General rel ations are derived beyond the Born approximation for both the scatteri ng amplitude and the Hikami vertex. The correlations between reflectio n and transmission coefficients are analyzed for a thick slab within t he framework of the diffusion approximation. Besides the coherent cont ribution to the correlation function, the incoherent one is considered in detail. Conditions are discussed under which the incoherent contri bution becomes particularly prominent.