Quark star matter in heavy quark stars
Peng-Cheng Chu (The Research Center for Theoretical Physics, Science School, Qingdao University of Technology, Qingdao, 266033, China, The Research Center of Theoretical Physics, Qingdao University of Technology, Qingdao, 266033, China); Yi Zhou (School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao, 266033, China); Yao-Yao Jiang (Qingdao University of Technology, Qingdao, 266033, China, Quantum physics laboratory, Qingdao University of Technology, Qingdao, 266033, China); Hong-Yang Ma (Qingdao University of Technology, Qingdao, 266033, China, Quantum physics laboratory, Qingdao University of Technology, Qingdao, 266033, China); He Liu (The Research Center for Theoretical Physics, Science School, Qingdao University of Technology, Qingdao, 266033, China, The Research Center of Theoretical Physics, Qingdao University of Technology, Qingdao, 266033, China); et al - Show all 7 authors
We study the thermodynamic properties of asymmetric quark matter and large mass quark stars within the confined-isospin-density-dependent-quark-mass model. We find that the quark matter symmetry energy should be very large in order to describe the recent discovered heavy compact stars PSR J0348+0432 ( $$\text {2.01}\pm \text {0.04}M_{\odot }$$ ), MSP J0740+6620 ( $$\text {2.14}\pm ^\text {0.10}_\text {0.09}M_{\odot }$$ of 68.3 $$\%$$ credibility interval and $$\text {2.14}\pm ^\text {0.20}_\text {0.18}M_{\odot }$$ of 95.4 $$\%$$ credibility interval) and PSR J2215+5135 (2.27 $$\pm ^\text {0.10}_\text {0.09}M_{\odot }$$ ) as QSs. The tidal deformability $$\Lambda _{1.4}$$ of the QSs is also investigated in this work, and the result indicates that $$\Lambda _{1.4}$$ may depend on the isospin effects and the strength / orientation distribution of the magnetic fields inside the quark stars.
