对称能对中子星性质的影响

admin   2019-08-27 13:50:20   4708

报告题目:对称能对中子星性质的影响
报告时间:2019-09-04 15:30 (星期三)
报告地点:long8唯一官方网站新校区理学院256
报告人:胡金牛 副教授(南开大学)

报告摘要:

The radii and tidal deformabilities of neutron stars are investigated in the framework of relativistic mean-field (RMF) model with different density-dependent behaviors of symmetry energy. To study the effects of symmetry energy on the properties of neutron stars, an $\omega$ meson and $\rho$ meson coupling term is included in a very successful RMF Lagrangian, i. e. TM1 parameter set. The coupling constants relevant to the isospin meson, $\rho$, are refitted by a fixed symmetry energy at subsaturation density and its slope at saturation density, while other coupling constants remain the same as the original ones in TM1. The radius and mass of maximum neutron stars are not so sensitive to the symmetry energy in these family TM1 parameterizations. However, the radii at intermediate mass region are strongly correlated with the slope of symmetry energy. Furthermore, the dimensionless tidal deformabilities of neutron stars are also calculated within the associated Love number, which is related to the quadrupole deformation of the star in a static external tidal field and can be extracted from the observation of gravitational wave generated by binary star merger. We find that its value at $1.4 M_\odot$ has a linear correlation to the slope of symmetry energy. With the latest constraints of tidal deformabilities from GW170817 event, the slope of symmetry energy at nuclear saturation density should be smaller than $60$ MeV. 


报告人简历:

胡金牛于2011年获得日本大阪大学博士学位。先后在日本大阪大学、日本理化学研究所、北京大学、德国于利希研究中心开展博士后及访问学者研究, 2014年受聘于南开大学物理科学学院从事教学科研工作。迄今为止在Physics Letters B、Scientific Report以及Physical Review C等原子核物理国际顶级期刊发表SCI论文30余篇 。研究方向为原子核结构理论,主要包括利用真实核力从第一性原理出发研究原子核的基本性质;三体核力在原子核结构中的作用;格点QCD理论在核物理中的应用;中子星的基本性质以及奇异原子核性质。 

代表作: 

【1】S. Bao, J. Hu, Z. Zhang, H. Shen, Phys. Rev. C 90 (2014) 045802  

【2】J. Hu, A. Li, H. Toki, W. Zuo, Phys. Rev. C 89 (2014) 025802  

【3】J. Hu,  Y. Zhang, E. Epelbaum, U. Meißner, J. Meng, Phys. Rev. C 96 (2017) 034307 

【4】J. Hu, H. Toki, W. Wen, H. Shen, Phys. Lett. B 687 (2010) 271  

【5】李昂,胡金牛,鲍世绍,申虹,徐仁新,Nucl. Phys. Rev.  36 (2019)


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