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arXiv 1711.04014physics.chem-ph
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无轨道动能密度泛函的简单约束

Trivial Constraints on Orbital-free Kinetic Energy Density Functionals

Kai Luo, S. B. Trickey

摘要:

动能密度泛函(KEDF)是无轨道密度泛函理论的核心。KEDFs的空间导数依赖性的限制已经从微分维里定理中得到了证明。我们指出一个中心的论点的缺陷:关系是不正确的任意密度,但只适用于最小化的密度和相应的化学势。因此,与权利要求相反,关系不是约束,并且不提供关于近似KEDF的空间导数依赖性的独立信息。一个简单的论点也表明,有效性的任意$v$ -可表示的密度是不能恢复呼吁的密度势双射。

英文摘要:

Kinetic energy density functionals (KEDFs) are central to orbital-free density functional theory. Limitations on the spatial derivative dependencies of KEDFs have been claimed from differential virial theorems. We point out a central defect in the argument: the relationships are not true for an arbitrary density but hold only for the minimizing density and corresponding chemical potential. Contrary to the claims therefore, the relationships are not constraints and provide no independent information about the spatial derivative dependencies of approximate KEDFs. A simple argument also shows that validity for arbitrary $v$-representable densities is not restored by appeal to the density-potential bijection.

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