Quark star matter in heavy quark stars

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 (2.01 +/- 0.04 M-circle dot), MSP J0740+6620 (2.14 +/-(0.10)(0.09) M-circle dot of 68.3% credibility interval and 2.14 +/-(0.20)(0.18) M-circle dot of 95.4% credibility interval) and PSR J2215+5135 (2.27 +/-(0.10)(0.09) M-circle dot) 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.

Automated summary

The study suggests that a large symmetry energy of quark matter is required to describe the recently discovered heavy compact stars as QSs. Additionally, the investigation on tidal deformability Lambda(1.4) indicates its possible dependence on isospin effects and the distribution of magnetic fields inside quark stars.