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arXiv 0712.2380cond-mat.str-el
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量子多体系统的变分Jastrow耦合集团理论

A variational Jastrow coupled-cluster theory of quantum many-body systems

Y. Xian

摘要:

本文在最近提出的变分耦合集团方法中加入一个新的Jastrow函数,研究了玻色子或费米子的一般量子系统的基态中的多体关联。我们的方法结合了耦合簇理论中的状态相关性和Jastrow函数的强短程相关性的优点。我们适用于广义的连锁集群扩展的Jastrow波函数和提供详细的分析,实际评估的哈密尔顿期望值作为能量泛函的Jastrow函数和裸密度分布函数,并在我们以前的出版物中计算;一个简单的,一阶能量泛函推导出和高阶贡献的详细公式提供。我们的能量泛函不遭受分歧,在大多数耦合集群计算时,适用于哈密尔顿与硬核潜力。讨论了我们的能量泛函与其他理论的能量泛函之间的关系。

英文摘要:

We study many-body correlations in the ground states of a general quantum system of bosons or fermions by including an additional Jastrow function in our ecently proposed variational coupled-cluster method. Our approach combines the dvantages of state-dependent correlations in the coupled-cluster theory and of strong, short-ranged correlations of the Jastrow function. We apply a generalized linked-cluster expansion for the Jastrow wavefunction and provide detailed analysis for practical evaluation of Hamiltonian expectation value as an energy functional of the Jastrow function and the bare density-distribution functions introduced and calculated in our earlier publications; a simple, first-order energy functional is derived and detailed formulas for higher-order contributions are provided. Our energy functional does not suffer the divergence as in most coupled-cluster calculations when applying to Hamiltonians with hardcore potentials. We also discuss relations between our energy functional and the energy functionals from other theories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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