Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
Volume 15, Issue 14, Pages 1969-2023Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S021797920100499X
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We give an overview of the underlying concepts of time-dependent density-functional theory. The basic relations between densities, potentials and initial states, for time-dependent many-body systems are discussed. We obtain some new results concerning the invertability of response functions. Some fundamental difficulties associated with the time-dependent action principle are discussed and we show how these difficulties can be resolved by means of the Keldysh formalism.
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