Dirk Schuricht, RWTH Aachen
In the first part we provide evidence that the relaxation dynamics of one-dimensional, metallic Fermi systems resulting out of an abrupt amplitude change of the two-particle interaction has aspects which are universal in the Luttinger liquid sense: The leading long-time behavior of certain observables is described by universal functions of the equilibrium Luttinger liquid parameter and the renormalized velocity. In the second part we study the relaxation dynamics in the Ising field theory after a quench in the fermion mass, which corresponds to a quench in the transverse field of the quantum Ising chain. The long-time behavior is obtained analytically by a resummation of the leading divergent terms in a form-factor expansion. We discuss the generalization of our results to the sine-Gordon model describing interference experiments on Bose condensates.