From Finite Nuclei to Neutron Stars: The Essential Role of High-Order Density Dependence in Effective Forces  

作　　者：Chong-Ji Jiang Yu Qiang Da-Wei Guan Qing-Zhen Chai Chun-Yuan Qiao Jun-Chen Pei 蒋崇基;强雨;管大为;柴清祯;乔春源;裴俊琛(State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China

出　　处：《Chinese Physics Letters》2021年第5期11-15,共5页中国物理快报（英文版）

基　　金：Supported by the National Key R&D Program of China (Grant No.2018YFA0404403);the National Natural Science Foundation of China (Grant Nos.11975032,11835001,11790325,and 11961141003)。

摘　　要：A unified description of finite nuclei and equation of state of neutron stars presents both a major challenge and also opportunities for understanding nuclear interactions.Inspired by the Lee-Huang-Yang formula of hardsphere gases,we develop effective nuclear interactions with an additional high-order density dependent term.While the original Skyrme force SLy4 is widely used in studies of neutron stars,there are not satisfactory global descriptions of finite nuclei.The refitted SLy4' force can improve descriptions of finite nuclei but slightly reduces the radius of neutron star of 1.4 M_☉ with M_☉ being the solar mass.We find that the extended SLy4 force with a higher-order density dependence can properly describe properties of both finite nuclei and GW170817 binary neutron stars,including the mass-radius relation and the tidal deformability.This demonstrates the essential role of high-order density dependence at ultrahigh densities.Our work provides a unified and predictive model for neutron stars,as well as new insights for the future development of effective interactions.

关 键 词：EOS The Essential Role of High-Order Density Dependence in Effective Forces From Finite Nuclei to Neutron Stars NEUTRON 

分 类 号：P145.6[天文地球—天体物理]