STUDY OF ELECTRONS IN CONTACT WITH NON-MARKOVIAN BATHS

We discuss the extension of the augmented space formalism to study sys tems of fermions in contact with a heat bath to incorporate non-Markov ian evolution of the bath variables. The formalism uses the ideas of t he memory function approach. We give a simple example to show how the non-Markovian nature of the bath effects the spectral response of the electron system.