Excited states from eigenvector continuation: The anharmonic oscillator

Excited states from eigenvector continuation: The anharmonic oscillator
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特征向量延拓的激发态:非简谐振子

DOI:
10.1016/j.physletb.2022.137101
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发表时间:
2021
期刊:
影响因子:
4.4
通讯作者:
A. Schwenk
A. Schwenk
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Margarida Companys Franzke;A. Tichai;K. Hebeler;A. Schwenk

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特征向量延拓作为一种多体展开的变分恢复工具,近年来在核结构和核反应中引起了广泛的关注。虽然以前的应用主要集中在基态能量上,但激发态也可以在同等的基础上获得。本工作致力于从特征向量延拓方法中详细理解激发态的出现。对于数值应用,研究了一维四次非谐振子,它代表了一个强非微扰量子系统,在这个系统中,使用标准微扰技术是行不通的。我们讨论了EC流形结构的不同选择如何影响EC恢复的质量,并详细研究了激发态EC的结果与完全对角化的结果作为基空间大小的函数。
Eigenvector continuation (EC) has recently attracted a lot attention in nuclear structure and reactions as a variational resummation tool for many-body expansions. While previous applications focused on ground-state energies, excited states can be accessed on equal footing. This work is dedicated to a detailed understanding of the emergence of excited states from the eigenvector continuation approach. For numerical applications the one-dimensional quartic anharmonic oscillator is investigated, which represents a strongly non-perturbative quantum system where the use of standard perturbation techniques break down. We discuss how different choices for the construction of the EC manifold affect the quality of the EC resummation and investigate in detail the results from EC for excited states compared to results from a full diagonalization as a function of the basis-space size.
使用特征向量连续进行散射的高效模拟器
DOI: 10.1016/j.physletb.2020.135719
发表时间: 2020
期刊: Physics Letters B
影响因子: 4.4
作者:
Furnstahl, R.J.;Garcia, A.J.;Millican, P.J.;Zhang, Xilin
通讯作者: Zhang, Xilin
DOI: 10.1016/j.physletb.2021.136608
发表时间: 2021
期刊: Physics Letters B
影响因子: 4.4
作者:
Melendez, J.A.;Drischler, C.;Garcia, A.J.;Furnstahl, R.J.;Zhang, Xilin
通讯作者: Zhang, Xilin