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A unified view on linear response of interacting systems utilizingmulticongurational time-dependent Hartree methods is presented. The cases ofone-particle and two-particle response operators for identical particles and upto all-system response operators for distinguishable degrees-of-freedom areconsidered. The working equations for systems of identical bosons (LR-MCTDHB)and identical fermions (LR-MCTDHF), as well for systems of distinguishableparticles (LR-MCTDH) are explicitly derived. These linear-response theoriesprovide numerically-exact excitation energies and system's properties, whennumerical convergence is achieved in the calculations.

Unified view on linear response of interacting identical and distinguishable particles from multiconfigurational time-dependent Hartree methods