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Improved many-body expansions from eigenvector continuation
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DOI：10.1103/PhysRevC.101.041302.png)
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Quantum many-body theory has witnessed tremendous progress in various fields, ranging from atomic and solid-state physics to quantum chemistry and nuclear structure. Due to the inherent computational burden linked to the ab initio treatment of microscopic fermionic systems, it is desirable to obtain accurate results through low-order perturbation theory. In atomic nuclei, however, effects such as strong short-range repulsion between nucleons can spoil the convergence of the expansion and make the reliability of perturbation theory unclear. Mathematicians have devised an extensive machinery to overcome the problem of divergent expansions by making use of so-called resummation methods. In large-scale many-body applications, such schemes are often of limited use since no a priori analytical knowledge of the expansion is available. We present here eigenvector continuation as an alternative resummation tool that is both efficient and reliable because it is based on robust and simple mathematical principles.
Keyword:
PERTURBATION-THEORY
NUCLEI
期刊
IF:
3.4
论文数:
2.9W
被引数:
5.7W
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引用论文
分享收藏Ab initio excited states from the in-medium similarity renormalization group.png)
PHYSICAL REVIEW C
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PHYSICAL REVIEW CIF3.4
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