Neutron Star Equation of State with Nucleon Short-Range Correlations: A Concise Review and Open Issues
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| Format: | Preprint |
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2025
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| _version_ | 1866908737405452288 |
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| author | Cai, Bao-Jun Li, Bao-An Ma, Yu-Gang |
| author_facet | Cai, Bao-Jun Li, Bao-An Ma, Yu-Gang |
| contents | Nucleon short-range correlations (SRCs) and the associated high-momentum tail (HMT) in its momentum distribution $n(k)$ represent a universal feature of strongly interacting Fermi systems. In nuclear matter, SRCs arise primarily from the spin-isospin dependence of the tensor and short-range components of the nucleon-nucleon interaction, leading to a substantial depletion of its Fermi sea and a characteristic $k^{-4}$ tail populated predominantly by isosinglet neutron-proton pairs. These microscopic structures modify both the kinetic and interaction contributions to the Equation of State (EOS) of dense matter and thereby influence a broad range of neutron-star (NS) properties. This short review provides a streamlined overview of how SRC-induced changes in $n(k)$ reshape the kinetic EOS, including its symmetry energy part and how these effects propagate into macroscopic NS observables, including mass-radius relations, tidal deformabilities, direct Urca thresholds and core-crust transition. We summarize key existing results, highlight current observational constraints relevant for testing SRC-HMT effects, and outline open questions for future theoretical, experimental, and multimessenger studies of dense nucleonic matter. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_23455 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Neutron Star Equation of State with Nucleon Short-Range Correlations: A Concise Review and Open Issues Cai, Bao-Jun Li, Bao-An Ma, Yu-Gang Nuclear Theory High Energy Astrophysical Phenomena High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Experiment Nucleon short-range correlations (SRCs) and the associated high-momentum tail (HMT) in its momentum distribution $n(k)$ represent a universal feature of strongly interacting Fermi systems. In nuclear matter, SRCs arise primarily from the spin-isospin dependence of the tensor and short-range components of the nucleon-nucleon interaction, leading to a substantial depletion of its Fermi sea and a characteristic $k^{-4}$ tail populated predominantly by isosinglet neutron-proton pairs. These microscopic structures modify both the kinetic and interaction contributions to the Equation of State (EOS) of dense matter and thereby influence a broad range of neutron-star (NS) properties. This short review provides a streamlined overview of how SRC-induced changes in $n(k)$ reshape the kinetic EOS, including its symmetry energy part and how these effects propagate into macroscopic NS observables, including mass-radius relations, tidal deformabilities, direct Urca thresholds and core-crust transition. We summarize key existing results, highlight current observational constraints relevant for testing SRC-HMT effects, and outline open questions for future theoretical, experimental, and multimessenger studies of dense nucleonic matter. |
| title | Neutron Star Equation of State with Nucleon Short-Range Correlations: A Concise Review and Open Issues |
| topic | Nuclear Theory High Energy Astrophysical Phenomena High Energy Physics - Phenomenology High Energy Physics - Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2512.23455 |