title: Dynamics of classical wave scattering by small obstacles.
abstract: A causality problem in the time-dependent scattering of classical waves from point scatterers is pointed out and analyzed. Based on an alternative model, the leading pole approximation of the exact scattering matrix of the square-well potential, transparent expressions for the time- and position-dependent Green function in a disordered medium are derived.
authors.affiliation: Theoretical Physics Group, Department of Applied Physics and Delft Institute of Microelectronics and Submicron Technology, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
authors.forename: G E
authors.initials: GE
authors.lastname: Bauer
authors.forename: M S
authors.initials: MS
authors.lastname: Ferreira
authors.forename: C P
authors.initials: CP
authors.lastname: Wapenaar