标题： 从包含膨胀标量介子的手征尺度有效理论中获得的核物质性质 显示英文标题

标题： Nuclear matter properties from chiral-scale effective theory including a dilatonic scalar meson

摘要： 手征有效理论已成为研究QCD低能性质的强大工具。 在这项工作中，我们应用了一种扩展的手征有效理论——手征尺度有效理论，并包含一个标量膨胀子，以研究核物质，发现其在饱和密度附近的性质可以很好地重现。 与核物质研究中常用的Walecka型模型相比，我们的方法在描述经验数据时改进了对称能和压缩系数的行为，而无需引入额外的自由度。 此外，预测的中子星结构符合GW170817、PSR J0740+6620和PSR J0030+0451的约束，同时最大中子星质量可达约$~3M_{\odot}$，且处于纯强子相。 另外，我们发现有效理论的对称模式显著影响中子星结构。 %在手征尺度有效理论中，有效算符按手征尺度阶数和由QCD对称模式引起的自由度良好组织。 我们认为将此类理论引入核物质研究，有助于更深入地理解QCD、核物质以及致密天体物理对象。 显示英文摘要

摘要： Chiral effective theory has become a powerful tool for studying the low-energy properties of QCD. In this work, we apply an extended chiral effective theory -- chiral-scale effective theory -- including a dilatonic scalar meson to study nuclear matter and find that the properties around saturation density can be well reproduced. Compared to the traditionally used Walecka-type models in nuclear matter studies, our approach improves the behavior of symmetry energy and the incompressibility coefficient in describing empirical data without introducing additional freedoms. Moreover, the predicted neutron star structures fall within the constraints of GW170817, PSR J0740+6620, and PSR J0030+0451, while the maximum neutron star mass can reach about $~3M_{\odot}$ with a pure hadronic phase. Additionally, we find that symmetry patterns of the effective theory significantly impact neutron star structures. %In chiral-scale effective theory, effective operators are well organized by chiral-scale orders and freedoms induced by QCD symmetry patterns. We believe that introducing this type of theory into nuclear matter studies can lead to a deeper understanding of QCD, nuclear matter, and compact astrophysical objects.