Time-dependent current density functional theory via time-dependent deformation functional theory: A constrained search formulation in the time domain

Details Time-dependent current density functional theory via time-dependent deformation functional theory: A constrained search formulation in the time domain Time-dependent current density functional theory via time-dependent deformation functional theory: A constrained search formulation in the time domain

2009-02-20

arxiv.org/abs/0902.3562v1

Physics

Condensed Matter

Strongly Correlated Electrons

revtex4, 24 pages

Scientific paper

The logical structure and the basic theorems of time-dependent current density functional theory (TDCDFT) are analyzed and reconsidered from the point of view of recently proposed time-dependent deformation functional theory (TDDefFT). It is shown that the formalism of TDDefFT allows to avoid a traditional external potential-to-density/current mapping. Instead the theory is formulated in a form similar to the constrained search procedure in the ground state DFT. Within this formulation of TDCDFT all basic functionals appear from the solution of a constrained universal many-body problem in a comoving reference frame, which is equivalent to finding a conditional extremum of a certain universal action functional. As a result the physical origin of the universal functionals entering the theory, as well as their proper causal structure becomes obvious. In particular, this leaves no room for any doubt concerning predictive power of the theory.

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