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- W3084421845 abstract "The nuclear many-body problem for medium-mass systems is commonly addressed using wave-function expansion methods that build upon a second-quantized representation of many-body operators with respect to a chosen computational basis. While various options for the computational basis are available, perturbatively constructed natural orbitals recently have been shown to lead to significant improvement in many-body applications yielding faster model-space convergence and lower sensitivity to basis set parameters in large-scale no-core shell model diagonalizations. This work provides a detailed comparison of single-particle basis sets and a systematic benchmark of natural orbitals in nonperturbative many-body calculations using the in-medium similarity renormalization group approach. As a key outcome we find that the construction of natural orbitals in a large single-particle basis enables for performing the many-body calculation in a reduced space of much lower dimension, thus offering significant computational savings in practice that help extend the reach of ab initio methods towards heavier masses and higher accuracy." @default.
- W3084421845 created "2020-09-14" @default.
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- W3084421845 date "2021-01-28" @default.
- W3084421845 modified "2023-10-16" @default.
- W3084421845 title "Natural orbitals for many-body expansion methods" @default.
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- W3084421845 doi "https://doi.org/10.1103/physrevc.103.014321" @default.
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