title: Response function including collisions for an interacting fermion gas.
abstract: The response function of an interacting fermion gas is considered in the entire (k-->,omega) space. Applying a generalized linear response theory, it is expressed in terms of determinants of equilibrium correlation functions, which allow for a systematic perturbative treatment. The relation to dynamical local-field factors is given. As a special case, the dielectric function is evaluated for two-component (hydrogen) plasmas at arbitrary degeneracies. Collisions are treated in Born approximation leading to a (k-->,omega)-dependent collision integral. The link to the dynamical conductivity is given in the long-wavelength limit. Sum rules are discussed.
authors.affiliation: Fachbereich Physik, University of Rostock, Universitätsplatz 3, D-18051 Rostock, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Röpke
authors.forename: R
authors.initials: R
authors.lastname: Redmer
authors.forename: A
authors.initials: A
authors.lastname: Wierling
authors.forename: H
authors.initials: H
authors.lastname: Reinholz