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.
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"source": "Springer",
"value": "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 ( $$\\text {2.01}\\pm \\text {0.04}M_{\\odot }$$ <math> <mrow> <mtext>2.01</mtext> <mo>\u00b1</mo> <mtext>0.04</mtext> <msub> <mi>M</mi> <mo>\u2299</mo> </msub> </mrow> </math> ), MSP J0740+6620 ( $$\\text {2.14}\\pm ^\\text {0.10}_\\text {0.09}M_{\\odot }$$ <math> <mrow> <mtext>2.14</mtext> <msubsup> <mo>\u00b1</mo> <mtext>0.09</mtext> <mtext>0.10</mtext> </msubsup> <msub> <mi>M</mi> <mo>\u2299</mo> </msub> </mrow> </math> of 68.3 $$\\%$$ <math> <mo>%</mo> </math> credibility interval and $$\\text {2.14}\\pm ^\\text {0.20}_\\text {0.18}M_{\\odot }$$ <math> <mrow> <mtext>2.14</mtext> <msubsup> <mo>\u00b1</mo> <mtext>0.18</mtext> <mtext>0.20</mtext> </msubsup> <msub> <mi>M</mi> <mo>\u2299</mo> </msub> </mrow> </math> of 95.4 $$\\%$$ <math> <mo>%</mo> </math> credibility interval) and PSR J2215+5135 (2.27 $$\\pm ^\\text {0.10}_\\text {0.09}M_{\\odot }$$ <math> <mrow> <msubsup> <mo>\u00b1</mo> <mtext>0.09</mtext> <mtext>0.10</mtext> </msubsup> <msub> <mi>M</mi> <mo>\u2299</mo> </msub> </mrow> </math> ) as QSs. The tidal deformability $$\\Lambda _{1.4}$$ <math> <msub> <mi>\u039b</mi> <mrow> <mn>1.4</mn> </mrow> </msub> </math> of the QSs is also investigated in this work, and the result indicates that $$\\Lambda _{1.4}$$ <math> <msub> <mi>\u039b</mi> <mrow> <mn>1.4</mn> </mrow> </msub> </math> may depend on the isospin effects and the strength / orientation distribution of the magnetic fields inside the quark stars."
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