Peng-Cheng Chu, Lie-Wen Chen
We extend the confined-density-dependent-mass model to include isospin dependence of the equivalent quark mass. Within the confined-isospin-density-dependent-mass model, we study the quark matter symmetry energy, the stability of strange quark matter, and the properties of quark stars. We find that including isospin dependence of the equivalent quark mass can significantly enhance the quark matter symmetry energy and stiffen strange quark matter. The recently discovered large mass pulsar PSR J1614-2230 with a mass of $1.97\pm0.04M_{\odot}$ can be well described by a quark star if the equivalent quark mass is strongly isospin dependent, indicating that the quark matter symmetry energy might be much stronger than the nuclear matter symmetry energy.
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http://arxiv.org/abs/1212.1388
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