arXiv 2205.048012022-05-21hep-phnucl-th

致密星中的退禁闭相变和夸克凝聚

Deconfinement phase transition and quark condensate in compact stars

Hao-Miao Jin, Cheng-Jun Xia, Ting-Ting Sun, Guang-Xiong Peng

摘要：

本文系统地研究了致密星中从核物质到夸克物质的可能的去禁闭相变。核物质的性质是通过将其结合能扩展到$ρ^3$数量级来确定的，而夸克物质的性质是通过等效粒子模型来预测的。麦克斯韦结构，然后应用于夸克-强子混合相。通过面对紧凑的恒星结构与脉冲星的观测，我们得到了几个EOS是兼容的最新观测，同时支持夸克核心内的最大质量的恒星。结果表明，对于具有$M\lesssim 2M_\odot$的致密星，夸克核相当小，不会出现。在介质夸克凝聚的恒星物质在这些恒星中，然后提取的等效粒子模型的框架内，非线性密度下降。在纯夸克物质密度较大的情况下，夸克凝聚仍然很大，并且不一定会随着密度的增加而减少，这表明在致密星覆盖的密度区域内有显着的非微扰贡献。

英文摘要：

We investigate systematically the possible deconfinement phase transition from nuclear matter to quark matter in compact stars. The properties of nuclear matter are fixed by expanding its binding energy to the order of $ρ^3$, while those of quark matter are predicted by an equivparticle model. The Maxwell construction is then applied for the quark-hadron mixed phase. By confronting compact star structures with pulsar observations, we obtain several EOSs that are compatible with the latest observations while supporting quark cores inside the most massive stars. It is found that the quark core is rather small and does not emerge for compact stars with $M\lesssim 2M_\odot$. The in-medium quark condensate of the stellar matter in those stars are then extracted within the framework of an equivparticle model, which decreases nonlinearly with density. At larger densities with pure quark matter, the quark condensate is still large and does not necessary decrease with density, indicating significant nonperturbative contributions within the density regions covered by compact stars.

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英文摘要：

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