QUARK MATTER SYMMETRY ENERGY AND QUARK STARS
QUARK MATTER SYMMETRY ENERGY AND QUARK STARS
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DOI：
10.1088/0004-637x/780/2/135
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
P. Chu;Lie-Wen Chen
中科院分区：
文献类型：
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作者：
P. Chu;Lie-Wen Chen
我们扩展了约束密度依赖质量（CDDM）模型，包括等效夸克质量的同位旋依赖。在有限同位旋密度依赖质量（CIDDM）模型下，我们研究了夸克物质的对称能、奇异夸克物质的稳定性和夸克星的性质。我们发现，包括等效夸克质量的同位旋依赖性可以显着影响夸克物质的对称性能量以及奇异夸克物质和夸克星的性质。虽然最近发现的大质量双星PSR J1614−2230和PSR J 0348 +0432的质量约为2 M，但在CDDM模型中，它们不可能是夸克星，但在CIDDM模型中，它们可以用夸克星来描述。特别是，我们的结果表明，在传统的Nambu-Jona-Lasinio模型中，为了将PSR J1614−2230和PSR J 0348 +0432描述为夸克星，双味u-d夸克物质的对称能至少应该是自由夸克气体或正常夸克物质的两倍。
We extend the confined-density-dependent-mass (CDDM) model to include isospin dependence of the equivalent quark mass. Within the confined-isospin-density-dependent-mass (CIDDM) 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 influence the quark matter symmetry energy as well as the properties of strange quark matter and quark stars. While the recently discovered large mass pulsars PSR J1614−2230 and PSR J0348+0432 with masses around 2 M☉ cannot be quark stars within the CDDM model, they can be well described by quark stars in the CIDDM model. In particular, our results indicate that the two-flavor u–d quark matter symmetry energy should be at least about twice that of a free quark gas or normal quark matter within the conventional Nambu–Jona-Lasinio model in order to describe PSR J1614−2230 and PSR J0348+0432 as quark stars.