Formation of Selfbound States in a One-Dimensional Nuclear Model -- A Renormalization Group based Density Functional Study

Formation of Selfbound States in a One-Dimensional Nuclear Model -- A Renormalization Group based Density Functional Study
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一维核模型中自束缚态的形成——基于重正化群的密度泛函研究

DOI:
10.1088/0954-3899/44/1/015101
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发表时间:
2017
期刊:
arXiv: Nuclear Theory
影响因子:
--
通讯作者:
J. Brau
J. Brau
中科院分区:
--
文献类型:
--
作者:
S. Kemler;M. Pospiech;J. Brau

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在核物理学中,密度泛函理论 (DFT) 为重核基态特性的最新研究提供了基础。然而,这些计算背后的密度泛函与微观核力的直接关系尚未完全了解。我们提出了 DFT 和重整化群 (RG) 技术的组合,该技术允许从微观相互作用研究自束缚多体系统。我们借助相同费米子系统通过一维长程吸引和短程排斥二体力相互作用来讨论其应用。我们计算这些系统的基态能量、本征密度和密度相关函数,并将我们的结果与其他方法获得的结果进行比较。特别是,我们展示了如何从我们的方法中的相关函数中提取激发态的能量以及基态波函数的绝对平方。借助对通过一般双体相互作用的 N 个相同费米子系统进行二阶能量校正计算,讨论并说明了多体摄动理论与我们的 DFT-RG 方法之间的关系。此外,我们在我们的框架内讨论了 DFT 研究中虚假出现的费米子自相互作用的控制。总的来说,我们的方法可能有助于指导未来从微观相互作用对重核进行定量 DFT 研究的能量泛函的发展。
In nuclear physics, density functional theory (DFT) provides the basis for state-of-the art studies of ground-state properties of heavy nuclei. However, the direct relation of the density functional underlying these calculations and the microscopic nuclear forces is not yet fully understood. We present a combination of DFT and renormalization group (RG) techniques which allows to study selfbound many-body systems from microscopic interactions. We discuss its application with the aid of systems of identical fermions interacting via a long-range attractive and short-range repulsive two-body force in one dimension. We compute ground-state energies, intrinsic densities, and density correlation functions of these systems and compare our results to those obtained from other methods. In particular, we show how energies of excited states as well as the absolute square of the ground-state wave function can be extracted from the correlation functions within our approach. The relation between many-body perturbation theory and our DFT-RG approach is discussed and illustrated with the aid of the calculation of the second-order energy correction for a system of N identical fermions interacting via a general two-body interaction. Moreover, we discuss the control of spuriously emerging fermion self-interactions in DFT studies within our framework. In general, our approach may help to guide the development of energy functionals for future quantitative DFT studies of heavy nuclei from microscopic interactions.
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