Abstract
The electron density n(r,t), which is the central tool of time-dependent density functional theory, is presently considered to be derivable from a one-body time-dependent potential V(r,t), via one-electron wave functions satisfying a time-dependent Schrödinger equation. This is here related via a generalized equation of motion to a Dirac density matrix now involving t. Linear response theory is then surveyed, with a special emphasis on the question of causality with respect to the density dependence of the potential. Extraction of V(r,t) for solvable models is also proposed.
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Acknowledgments
We wish to acknowledge that the present article was brought to fruition during a visit of both authors to the Division of Molecular Biophysics at the German Cancer Research Center (DKFZ). It is a pleasure to thank Professor S. Suhai for generous hospitality and for arranging a Scholarship to support the visit. Finally NHM thanks Prof. A. Rubio for valuable discussions pertaining to charge-transfer excitations.
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Dedicated to Professor Sandor Suhai on the occasion of his 65th birthday and published as part of the Suhai Festschrift Issue.
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Niehaus, T.A., March, N.H. Brief review related to the foundations of time-dependent density functional theory. Theor Chem Acc 125, 427–432 (2010). https://doi.org/10.1007/s00214-009-0578-0
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DOI: https://doi.org/10.1007/s00214-009-0578-0