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

Le résumé fourni par la source

Abstract Chiral effective theory has become a powerful tool for studying the low-energy properties of QCD. In this study, we apply an extended chiral effective theory—chiral-scale effective theory—including a dilatonic scalar meson to study nuclear matter. It is found that the properties around saturation density can be well reproduced. Compared to Walecka-type models in nuclear matter studies, our approach improves the behavior of symmetry energy in describing empirical data without introducing an additional isovector scalar meson δ to make it soft at intermediate densities. Moreover, the predicted neutron star mass-radius relations fall within the constraints of GW170817, PSR J0740+6620, and PSR J0030+0451, while the maximum neutron star mass can reach with a pure hadronic phase. Additionally, we find that symmetry patterns of the effective theory significantly impact neutron star structures. We believe that introducing this type of theory into nuclear matter studies can contribute to a more comprehensive understanding of QCD, nuclear matter, and compact astrophysical objects.

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