In-medium similarity renormalization group for a pairing-plus-particle-hole model
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866918122864246784 |
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| author | Chen, L. H. Yao, Y. G. He, B. C. |
| author_facet | Chen, L. H. Yao, Y. G. He, B. C. |
| contents | We benchmark two implementations of the in-medium similarity renormalization group (IMSRG) method, IMSRG(2) and IMSRG(2*), for the low-lying states of a pairing-plus-particle-hole model with varying numbers of fermions. In IMSRG(2), all operators are truncated up to the normal-ordered two-body terms, whereas IMSRG(2*) includes an additional term to partially account for higher-body contributions. The results are compared against exact solutions. We find that IMSRG(2*) consistently outperforms IMSRG(2) for both ground and excited states, although achieving convergence for excited states remains more challenging in strongly correlated systems than for the ground state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_08595 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | In-medium similarity renormalization group for a pairing-plus-particle-hole model Chen, L. H. Yao, Y. G. He, B. C. Nuclear Theory We benchmark two implementations of the in-medium similarity renormalization group (IMSRG) method, IMSRG(2) and IMSRG(2*), for the low-lying states of a pairing-plus-particle-hole model with varying numbers of fermions. In IMSRG(2), all operators are truncated up to the normal-ordered two-body terms, whereas IMSRG(2*) includes an additional term to partially account for higher-body contributions. The results are compared against exact solutions. We find that IMSRG(2*) consistently outperforms IMSRG(2) for both ground and excited states, although achieving convergence for excited states remains more challenging in strongly correlated systems than for the ground state. |
| title | In-medium similarity renormalization group for a pairing-plus-particle-hole model |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2508.08595 |