Neutron matter from local chiral effective field theory interactions at large cutoffs
Neutron matter is an important many-body system that provides valuable constraints for the equation of state (EOS) of neutron stars. Neutron-matter calculations employing chiral effective field theory (EFT) interactions have been extensively used for this purpose. Among the various many-body methods...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/r314-6r62 |
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| _version_ | 1850083284799717376 |
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| author | Ingo Tews Rahul Somasundaram Diego Lonardoni Hannah Göttling Rodric Seutin Joseph Carlson Stefano Gandolfi Kai Hebeler Achim Schwenk |
| author_facet | Ingo Tews Rahul Somasundaram Diego Lonardoni Hannah Göttling Rodric Seutin Joseph Carlson Stefano Gandolfi Kai Hebeler Achim Schwenk |
| author_sort | Ingo Tews |
| collection | DOAJ |
| description | Neutron matter is an important many-body system that provides valuable constraints for the equation of state (EOS) of neutron stars. Neutron-matter calculations employing chiral effective field theory (EFT) interactions have been extensively used for this purpose. Among the various many-body methods, quantum Monte Carlo (QMC) methods stand out due to their nonperturbative nature and the achievable precision. However, QMC methods require local interactions as input, which leads to the appearance of stronger regulator artifacts compared to nonlocal interactions. To circumvent this, we employ large-cutoff interactions derived within chiral EFT (400MeV≤Λ_{c}≤700MeV) for studies of pure neutron matter. These interactions have been adjusted to nucleon-nucleon scattering phase shifts, the triton binding energy, as well as the triton β-decay half-life. We find that regulator artifacts significantly decrease with increasing cutoff, leading to a significant reduction of uncertainties in the neutron-matter EOS. We discuss implications for the symmetry energy and demonstrate how our new calculations lead to a reduction in the theoretical uncertainty of predicted neutron-star radii by up to 30% for low-mass stars. |
| format | Article |
| id | doaj-art-efb08f6a33774eac845c47cffa15361a |
| institution | DOAJ |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-efb08f6a33774eac845c47cffa15361a2025-08-20T02:44:19ZengAmerican Physical SocietyPhysical Review Research2643-15642025-07-017303302410.1103/r314-6r62Neutron matter from local chiral effective field theory interactions at large cutoffsIngo TewsRahul SomasundaramDiego LonardoniHannah GöttlingRodric SeutinJoseph CarlsonStefano GandolfiKai HebelerAchim SchwenkNeutron matter is an important many-body system that provides valuable constraints for the equation of state (EOS) of neutron stars. Neutron-matter calculations employing chiral effective field theory (EFT) interactions have been extensively used for this purpose. Among the various many-body methods, quantum Monte Carlo (QMC) methods stand out due to their nonperturbative nature and the achievable precision. However, QMC methods require local interactions as input, which leads to the appearance of stronger regulator artifacts compared to nonlocal interactions. To circumvent this, we employ large-cutoff interactions derived within chiral EFT (400MeV≤Λ_{c}≤700MeV) for studies of pure neutron matter. These interactions have been adjusted to nucleon-nucleon scattering phase shifts, the triton binding energy, as well as the triton β-decay half-life. We find that regulator artifacts significantly decrease with increasing cutoff, leading to a significant reduction of uncertainties in the neutron-matter EOS. We discuss implications for the symmetry energy and demonstrate how our new calculations lead to a reduction in the theoretical uncertainty of predicted neutron-star radii by up to 30% for low-mass stars.http://doi.org/10.1103/r314-6r62 |
| spellingShingle | Ingo Tews Rahul Somasundaram Diego Lonardoni Hannah Göttling Rodric Seutin Joseph Carlson Stefano Gandolfi Kai Hebeler Achim Schwenk Neutron matter from local chiral effective field theory interactions at large cutoffs Physical Review Research |
| title | Neutron matter from local chiral effective field theory interactions at large cutoffs |
| title_full | Neutron matter from local chiral effective field theory interactions at large cutoffs |
| title_fullStr | Neutron matter from local chiral effective field theory interactions at large cutoffs |
| title_full_unstemmed | Neutron matter from local chiral effective field theory interactions at large cutoffs |
| title_short | Neutron matter from local chiral effective field theory interactions at large cutoffs |
| title_sort | neutron matter from local chiral effective field theory interactions at large cutoffs |
| url | http://doi.org/10.1103/r314-6r62 |
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