title: Truncated phase-space approach to polaron response.
abstract: A method is presented to obtain the linear response coefficients of a system coupled to a bath. The method is based on a systematic truncation of the Liouville equation for the reduced distribution function. The first-order truncation results are expected to be accurate in the low-temperature and weak-coupling regime. Explicit expressions for the conductivity of the Fröhlich polaron are obtained, and the discrepancy between the Kadanoff and the Feynman-Hellwarth-Iddings-Platzman mobility is elucidated.
authors.affiliation: Physics Department, University of Antwerp, Universiteitsplein 1, 2060 Antwerpen, Belgium.
authors.forename: Dries
authors.initials: D
authors.lastname: Sels
authors.affiliation: Physics Department, University of Antwerp, Universiteitsplein 1, 2060 Antwerpen, Belgium.
authors.forename: Fons
authors.initials: F
authors.lastname: Brosens