{"title":"Influence of hyperon–hyperon interaction on the properties of neutron stars","authors":"R M Aguirre","doi":"10.1088/1361-6471/ad15e6","DOIUrl":null,"url":null,"abstract":"The properties of neutron stars are studied in a composite model of the strong interaction. In the regime of low to medium baryonic densities a covariant hadronic model is adopted which includes an exclusive channel for the hyperon–hyperon interaction mediated by hidden strangeness mesons, which in turn couple to other mesons through polynomial vertices. The new coupling constants are subject to phenomenological constraints. The presence of free quarks in the core of the star is considered by using the Nambu–Jona Lasinio model supplemented with a vector interaction. The deconfinement process is described by a continuous coexistence of phases. Several structure parameters of neutron stars, such as mass-radius relation, moment of inertia, tidal deformability, and the propagation of nonradial f and g-modes within the relativistic Cowling approximation are studied. The predictions of the model are in good agreement with recent observational data, in particular the maximum inertial mass is greater than the observational lower limit of two solar masses.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"59 1","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Physics G: Nuclear and Particle Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1088/1361-6471/ad15e6","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
The properties of neutron stars are studied in a composite model of the strong interaction. In the regime of low to medium baryonic densities a covariant hadronic model is adopted which includes an exclusive channel for the hyperon–hyperon interaction mediated by hidden strangeness mesons, which in turn couple to other mesons through polynomial vertices. The new coupling constants are subject to phenomenological constraints. The presence of free quarks in the core of the star is considered by using the Nambu–Jona Lasinio model supplemented with a vector interaction. The deconfinement process is described by a continuous coexistence of phases. Several structure parameters of neutron stars, such as mass-radius relation, moment of inertia, tidal deformability, and the propagation of nonradial f and g-modes within the relativistic Cowling approximation are studied. The predictions of the model are in good agreement with recent observational data, in particular the maximum inertial mass is greater than the observational lower limit of two solar masses.
在强相互作用的复合模型中研究了中子星的性质。在中低重子密度体系中，采用了一个协变强子模型，其中包括一个由隐藏的奇异介子介导的超子-超子相互作用的专属通道，而奇异介子又通过多项式顶点与其他介子耦合。新的耦合常数受到现象学约束。通过使用 Nambu-Jona Lasinio 模型并辅以矢量相互作用，考虑了星核中自由夸克的存在。相位的连续共存描述了去撞击过程。研究了中子星的几个结构参数，如质量-半径关系、惯性矩、潮汐变形能力，以及相对论考林近似中的非径向 f 和 g 模式的传播。该模型的预测结果与最近的观测数据十分吻合，尤其是最大惯性质量大于两个太阳质量的观测下限。
期刊介绍：
Journal of Physics G: Nuclear and Particle Physics (JPhysG) publishes articles on theoretical and experimental topics in all areas of nuclear and particle physics, including nuclear and particle astrophysics. The journal welcomes submissions from any interface area between these fields.
All aspects of fundamental nuclear physics research, including:
nuclear forces and few-body systems;
nuclear structure and nuclear reactions;
rare decays and fundamental symmetries;
hadronic physics, lattice QCD;
heavy-ion physics;
hot and dense matter, QCD phase diagram.
All aspects of elementary particle physics research, including:
high-energy particle physics;
neutrino physics;
phenomenology and theory;
beyond standard model physics;
electroweak interactions;
fundamental symmetries.
All aspects of nuclear and particle astrophysics including:
nuclear physics of stars and stellar explosions;
nucleosynthesis;
nuclear equation of state;
astrophysical neutrino physics;
cosmic rays;
dark matter.
JPhysG publishes a variety of article types for the community. As well as high-quality research papers, this includes our prestigious topical review series, focus issues, and the rapid publication of letters.
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