On the compatibility of causality and symmetry (Comments on "Analysis of causality in time-dependent density functional theory")
M. Ya. Amusia, V. R. Shaginyan
Abstract
It is argued that there exists the only one inverse of the linear response function χ, i.e. χ-1, which depends symmetrically of its spatial-times variables, see M.K. Harbola, and A. Banerjee, Phys. Rev. A 60, 5101 (1999). Some brief comments on this consideration are presented. We show instead, that it is possible to construct the causal inverse also. At the same time we confirm the main statement of M.K. Harbola and A. Banerjee that in fact there is no contradiction between the symmetry and causality.
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