Neutron matter from local chiral effective field theory interactions at large cutoffs

被引：0

作者：

Tews, Ingo ^{[1
]}

Somasundaram, Rahul ^{[1
,2
]}

Lonardoni, Diego ^{[1
,6
]}

Goettling, Hannah ^{[3
,4
]}

Seutin, Rodric ^{[3
,4
,5
]}

Carlson, Joseph ^{[1
]}

Gandolfi, Stefano ^{[1
]}

Hebeler, Kai ^{[3
,4
,5
]}

Schwenk, Achim ^{[3
,4
,5
]}

机构：

[1] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA

[2] Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA

[3] Tech Univ Darmstadt, Dept Phys, D-64289 Darmstadt, Germany

[4] GSI Helmholtzzentrum Schwerionenforsch GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[5] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[6] Los Alamos Natl Lab, Eulerian Codes Grp, XCP 2, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW RESEARCH | 2025年 / 7卷 / 03期

基金：

欧洲研究理事会; 美国国家科学基金会;

关键词：

MONTE-CARLO METHODS; NUCLEAR-PHYSICS; EQUATION; STATE;

D O I：

10.1103/r314-6r62

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 (400 MeV Ac 700 MeV) 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 /3-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.

引用

页数：7

共 61 条

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