Diffusion of polymer chains in disordered media

The diffusion of a polymer chain in a random environment is studied by means of the RG method. Below the critical dimension of the disorder considered ($d_{\rm c}=2$) the anomalous diffusion takes place and the results for polymer chain follows from that of the Brownian particle by an appropriate rescaling of the strength of the disorder and the bare diffusion coefficient. The results of the RG study of the anomalous diffusion below the critical dimension are used to compute the renormalized diffusion coefficient above the critical dimension