title: Unified view on linear response of interacting identical and distinguishable particles from multiconfigurational time-dependent Hartree methods.
abstract: A unified view on linear response of interacting systems utilizing multiconfigurational time-dependent Hartree methods is presented. The cases of one-particle and two-particle response operators for identical particles and up to all-system response operators for distinguishable degrees-of-freedom are considered. The working equations for systems of identical bosons and identical fermions, as well for systems of distinguishable particles are explicitly derived. These linear-response theories - applicable for discrete excitation spectra - provide numerically exact excitation energies and system's properties, when numerical convergence is achieved in the calculations.
authors: Department of Physics, University of Haifa at Oranim, Tivon 36006, Israel.
authors: Ofir E
authors: OE
authors: Alon
authors: Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
authors: Alexej I
authors: AI
authors: Streltsov
authors: Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
authors: Lorenz S
authors: LS
authors: Cederbaum