title: Completely positive quantum dissipation
abstract: A completely positive master equation describing quantum dissipation for a Brownian particle is derived starting from microphysical collisions, exploiting a recently introduced approach to subdynamics of a macrosystem. The obtained equation can be cast into Lindblad form with a single generator for each Cartesian direction. Temperature dependent friction and diffusion coefficients for both position and momentum are expressed in terms of the collision cross section.
authors.affiliation: Dipartimento di Fisica dell'Universita di Milano and INFN, Sezione di Milano, Via Celoria 16, I-20133 Milan, Italy and and Fachbereich Physik, Philipps-Universitat, Renthof 7, D-35032 Marburg, Germany.
authors.initials: B
authors.lastname: Vacchini