title: Superadiabatic forces in Brownian many-body dynamics.
abstract: Theoretical approaches to nonequilibrium many-body dynamics generally rest upon an adiabatic assumption, whereby the true dynamics is represented as a sequence of equilibrium states. Going beyond this simple approximation is a notoriously difficult problem. For the case of classical Brownian many-body dynamics, we present a simulation method that allows us to isolate and precisely evaluate superadiabatic correlations and the resulting forces. Application of the method to a system of one-dimensional hard particles reveals the importance for the dynamics, as well as the complexity, of these nontrivial out-of-equilibrium contributions. Our findings help clarify the status of dynamical density functional theory and provide a rational basis for the development of improved theories.
authors.affiliation: Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany.
authors.forename: Andrea
authors.initials: A
authors.lastname: Fortini
authors.affiliation: Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: de Las Heras
authors.affiliation: Soft Matter Theory, University of Fribourg, CH-1700 Fribourg, Switzerland.
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Brader
authors.affiliation: Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Schmidt