Hartree energy covariant

Eh is the covariant form of the Hartree energy, which can be split into the Coulomb contribution e j and a transverse part Ej,... 

The second correction is a modification of the interaction energies. On the level of relativistic density functional theory for Coulomb systems this means, for instance, the replacement of the standard Hartree energy by its covariant form involving electron four-currents, j and the photon propagator,... 

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