Functional integrals for the Anderson lattice

The infinite U limit of the Anderson lattice model can be formulated as a n on-Hermitean Hamiltonian, where the usual hybridization is contained in the unperturbed part. The grand partition function is written as a functional integral, from which one obtains a perturbation expansion which automatical ly contains a linked diagram expansion. Further typical approximations to t he functional integral are discussed. (C) 1999 Elsevier Science B.V. All ri ghts reserved.