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MANY-BODY SIMILARITY TRANSFORMATIONS GENERATED BY NORMAL ORDERED EXPONENTIAL EXCITATION OPERATORS

机译:正常有序指数激励算子生成的多体相似变换

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Normal ordered exponential operators have been used extensively in open-shell formulations of coupled cluster theory. The inverse of such an operator is known to exist, but a closed form explicit expression for the inverse is not available. We will address the evaluation of many-body similarity transformations generated by normal ordered exponential transformation operators without explicit use of the inverse. The similarity transform can be obtained as the solution of a linear system of equations that can be solved trivially using backward substitution. In addition a closed form diagrammatic expression for the similarity transformed operator is presented. Using the many-body similarity transformation strategy a simple and more general formulation of Fock space coupled cluster theory is presented which is akin in spirit to the formulation by Stolarczyk and Monkhorst [Phys. Rev. A 32, 725, 743 (1985); 37, 1908, 1926 (1988)], but which on the other hand is completely equivalent to the conventional wave operator formulation of Fock space coupled cluster theory (under suitable conditions). Other possible applications of the many-body similarity transformation will be briefly discussed. (C) 1996 American Institute of Physics. [References: 44]
机译:正规有序指数算子已广泛用于耦合聚类理论的开壳公式中。已知存在这种运算符的逆函数,但是该逆函数的闭式显式表达式不可用。我们将解决在不显式使用逆函数的情况下,对由正常有序指数变换算符生成的多体相似变换进行评估的问题。作为线性方程组的解,可以获得相似变换,可以使用向后替换来简单地求解。另外,给出了相似变换算子的闭式图解表达式。使用多体相似性变换策略,提出了一种Fock空间耦合聚类理论的简单且更通用的表述,其实质与Stolarczyk和Monkhorst的表述类似。 Rev A 32,725,743(1985); 37,1908,1926(1988)],但另一方面,它完全等同于Fock空间耦合聚类理论的常规波动算子公式(在适当条件下)。将简要讨论多体相似性转换的其他可能应用。 (C)1996年美国物理研究所。 [参考:44]

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