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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2507.03825 |
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| _version_ | 1866915712005570560 |
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| author | Krotscheck, Eckhard Wang, Jiawei |
| author_facet | Krotscheck, Eckhard Wang, Jiawei |
| contents | To deal with the problem of realistic nuclear interactions we have combined techniques of the Jastrow-Feenberg variational method and the local parquet-diagram theory. In the language of diagrammatic perturbation theory, ``commutator diagrams'' can be identified with non-parquet diagrams. We examine the physical processes described by these terms and include the relevant diagrams in a way that is suggested by the Jastrow-Feenberg approach. We show that the corrections from non-parquet contributions are, at short distances, larger than all other many-body effects.
We examine here neutron matter as a prototype of systems with state-dependent interactions. Calculations are carried out for neutrons interacting via the so-called $v_8$ version of four popular interactions. We determine the structure and effective interactions and apply the method to the calculation of the energetics, structure and dynamic properties such as the single-particle self-energy and the dynamic response functions as well as BCS pairing in both singlet and triplet states. We find that many-body correlations lead to a strong reduction of the spin-orbit interaction, and, therefore, to a suppression of the $^3P_2$ and $^3P_2$-$^3F_2$ gaps. We also find pairing in $^3P_0$ states; the strength of the pairing gap depends sensitively on the potential model employed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_03825 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Variational Theory and Parquet Diagrams for Nuclear Systems: A Comprehensive Study of Neutron Matter Krotscheck, Eckhard Wang, Jiawei Nuclear Theory To deal with the problem of realistic nuclear interactions we have combined techniques of the Jastrow-Feenberg variational method and the local parquet-diagram theory. In the language of diagrammatic perturbation theory, ``commutator diagrams'' can be identified with non-parquet diagrams. We examine the physical processes described by these terms and include the relevant diagrams in a way that is suggested by the Jastrow-Feenberg approach. We show that the corrections from non-parquet contributions are, at short distances, larger than all other many-body effects. We examine here neutron matter as a prototype of systems with state-dependent interactions. Calculations are carried out for neutrons interacting via the so-called $v_8$ version of four popular interactions. We determine the structure and effective interactions and apply the method to the calculation of the energetics, structure and dynamic properties such as the single-particle self-energy and the dynamic response functions as well as BCS pairing in both singlet and triplet states. We find that many-body correlations lead to a strong reduction of the spin-orbit interaction, and, therefore, to a suppression of the $^3P_2$ and $^3P_2$-$^3F_2$ gaps. We also find pairing in $^3P_0$ states; the strength of the pairing gap depends sensitively on the potential model employed. |
| title | Variational Theory and Parquet Diagrams for Nuclear Systems: A Comprehensive Study of Neutron Matter |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2507.03825 |