Tidal deformability of strange stars and the GW170817 event
Tidal deformability of strange stars and the GW170817 event
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DOI：
10.1103/physrevd.103.103010
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
O. Lourenço;C. H. Lenzi;M. Dutra;E. J. Ferrer;V. de la Incera;L. Paulucci;J. Horvath
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文献类型：
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作者：
O. Lourenço;C. H. Lenzi;M. Dutra;E. J. Ferrer;V. de la Incera;L. Paulucci;J. Horvath
在这项工作中，我们考虑了色超导的色味锁定(CFL)相中夸克物质形成的奇异星。CFL相用Nambu-Jona-Lasinio模型描述，该模型具有四个费米子矢量和双夸克相互作用通道。通过在热力学势能中考虑胶子自能，考虑了色超导介质对胶子的影响。我们通过改变矢量耦合GV，并将结果与GW170817事件的潮汐变形性数据、MSP J0740+6620等大质量脉冲星的最大质量观测数据以及PSR J003+0451的更好的质量/半径数据进行比较，构建了模型的参数化。我们的结果指出了考虑胶子效应和不考虑胶子效应的模型的GV参数空间的窗口，它们分别与所有这些天体物理约束，即分别为0.21<；Gv/gs<；0.4和0.02<；Gv/gs<；0.1兼容。我们还观察到GW170817事件的潮汐变形性与GV之间有很强的相关性。我们的结果表明，从结构的角度来看，不能排除致密双星碰撞中存在奇异恒星的可能性。
In this work we consider strange stars formed by quark matter in the color-flavor-locked (CFL) phase of color superconductivity. The CFL phase is described by a Nambu-Jona-Lasinio model with four-fermion vector and diquark interaction channels. The effect of the color superconducting medium on the gluons are incorporated into the model by including the gluon self-energy in the thermodynamic potential. We construct parametrizations of the model by varying the vector coupling GV and comparing the results to the data on tidal deformability from the GW170817 event, the observational data on maximum masses from massive pulsars such as the MSP J0740+6620, and the mass/radius fits to NICER data for PSR J003+0451. Our results points out to windows for the GV parameter space of the model, with and without gluon effects included, that are compatible with all these astrophysical constraints, namely, 0.21 < GV /GS < 0.4, and 0.02 < GV /GS < 0.1, respectively. We also observe a strong correlation between the tidal deformabilites of the GW170817 event and GV . Our results indicate that strange stars cannot be ruled out in collisions of compact binaries from the structural point of view.