title: Space-adiabatic perturbation theory in quantum dynamics.
abstract: A systematic perturbation scheme is developed for approximate solutions to the time-dependent Schrödinger equation with a space-adiabatic Hamiltonian. For a particular isolated energy band, the basic approach is to separate kinematics from dynamics. The kinematics is defined through a subspace of the full Hilbert space for which transitions to other band subspaces are suppressed to all orders, and the dynamics operates in that subspace in terms of an effective intraband Hamiltonian. As novel applications, we discuss the Born-Oppenheimer theory to second order and derive for the first time the nonperturbative definition of the g factor of the electron within nonrelativistic quantum electrodynamics.
authors.affiliation: Zentrum Mathematik and Physik Department, TU München, D-80290 München, Germany. panati@sissa.it
authors.forename: Gianluca
authors.initials: G
authors.lastname: Panati
authors.forename: Herbert
authors.initials: H
authors.lastname: Spohn
authors.forename: Stefan
authors.initials: S
authors.lastname: Teufel