Study of nonstrange quark stars within a modified NJL model

被引:8
作者
Li, Cheng-Ming [1 ]
Zuo, Shu-Yu [2 ]
Zhao, Ya-Peng [3 ]
Mu, Hui-Jun [1 ]
Huang, Yong-Feng [4 ]
机构
[1] Zhengzhou Univ, Sch Phys & Microelect, Zhengzhou 450001, Peoples R China
[2] Henan Univ Technol, Coll Sci, Zhengzhou 450000, Peoples R China
[3] Henan Univ Urban Construct, Sch Math & Phys, Pingdingshan 467036, Peoples R China
[4] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金; 国家重点研发计划;
关键词
EQUATION-OF-STATE; BAG CONSTANT; DEPENDENCE; QCD;
D O I
10.1103/PhysRevD.106.116009
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
this work, a modified Nambu-Jona-Lasinio (NJL) model with proper-time regularization is employed to study the properties of hypothetical nonstrange quark stars. The coupling constant of the four-fermion interaction in the conventional NJL model is modified as G = G(1) + G(2)h <(psi) over bar psi > to highlight the feedback of the quark propagator to the gluon propagator. To study the dependence of the equation of state (EOS) on this modification as well as the vacuum pressure, we choose nine representative EOSs for comparison. It is found that a smaller G 1 leads to a stiffer EOS, and a higher vacuum pressure (i.e., a smaller bag constant) yields a softer EOS at low energy density. It is further shown that the heaviest quark star under this modified NJL model satisfies not only the recent mass measurement of PSR J0740 + 6620, but also the radius constraints from x-ray timing observations. The corresponding tidal deformability is also in agreement with the observations of GW170817.
引用
收藏
页数:9
相关论文
共 50 条
[41]   A realistic model for charged strange quark stars [J].
Thirukkanesh, S. ;
Ragel, F. C. .
CHINESE PHYSICS C, 2017, 41 (01)
[42]   RELATIVISTIC HARMONIC OSCILLATOR MODEL FOR QUARK STARS [J].
Bannur, Vishnu M. .
MODERN PHYSICS LETTERS A, 2009, 24 (39) :3183-3191
[43]   Fierz-complete NJL model study. III. Emergence from quark-gluon dynamics [J].
Braun, Jens ;
Leonhardt, Marc ;
Pospiech, Martin .
PHYSICAL REVIEW D, 2020, 101 (03)
[44]   Thermal effects on the baryon-quark phase transition in hot hybrid neutron stars: a statistical mean-field baryonic model with the standard NJL model for deconfined quarks [J].
Ghaemmaghami, S. A. ;
Mojarrad, M. Ghazanfari .
EUROPEAN PHYSICAL JOURNAL PLUS, 2023, 138 (11)
[45]   Chiral density waves in the NJL2 model with quark number and isospin chemical potentials [J].
Ebert, D. ;
Gubina, N. V. ;
Klimenko, K. G. ;
Kurbanov, S. G. ;
Zhukovsky, V. Ch. .
PHYSICAL REVIEW D, 2011, 84 (02)
[46]   Isgur-Wise function within a modified heavy-light chiral quark model [J].
Eeg, Jan O. ;
Kumericki, Kresimir .
PHYSICAL REVIEW D, 2010, 81 (07)
[47]   Asymptotically conformal color-flavor-locked quark matter within a nonlocal chiral quark model [J].
Ivanytskyi, Oleksii .
PHYSICAL REVIEW D, 2025, 111 (03)
[48]   Isovector properties of quark matter and quark stars in an isospin-dependent confining model [J].
Chu, Peng-Cheng ;
Chen, Lie-Wen .
PHYSICAL REVIEW D, 2017, 96 (08)
[49]   New algorithm to study the pseudo-Wigner solution of the quark gap equation in the framework of the (2+1)-flavor NJL model [J].
Li, Cheng-Ming ;
Yin, Pei-Lin ;
Zong, Hong-Shi .
PHYSICAL REVIEW D, 2019, 99 (07)
[50]   Rotating hybrid stars with the Dyson-Schwinger quark model [J].
Wei, J. -B. ;
Chen, H. ;
Burgio, G. F. ;
Schulze, H. -J. .
PHYSICAL REVIEW D, 2017, 96 (04)