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arXiv 2011.12593nucl-th
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具有矢量相互作用的SU(3)局域Nambu-Jona-Lasinio(NJL)模型中的强子-夸克相变

Hadron-quark phase transition in the SU(3) local Nambu-Jona-Lasinio (NJL) model with vector interaction

Grigor Alaverdyan

摘要:

研究了致密星物质的强子-夸克混合状态方程。夸克物质相采用Nambu-Jona-Lasinio(NJL)局域SU(3)模型,夸克物质相采用矢量型相互作用;强子物质相采用相对论平均场(RMF)理论,夸克物质相采用标量-等矢量$δ$ -介子有效场。结果表明,矢量耦合常数越大,奇异夸克出现的阈值密度越低。对于一个足够小的矢量耦合常数的值,函数的质量依赖于重子化学势的区域的模糊性,导致相变在非奇异夸克物质的重子数密度的突变。结果表明,在NJL模型的框架内,奇异夸克物质的绝对稳定性假设是不成立的。为了描述从强子物质到夸克物质的相变,我们采用了麦克斯韦结构。结果表明,矢量耦合越大,夸克物质状态方程的刚度越大,相变压力也越大。我们的结果表明,夸克相的无穷小核心,形成在中子星的中心,是稳定的。

英文摘要:

We study the hadron-quark hybrid equation of state (EOS) of compact-star matter. The Nambu-Jona-Lasinio (NJL) local SU(3) model with vector-type interaction is used to describe the quark matter phase, while the relativistic mean field (RMF) theory with scalar-isovector $δ$-meson effective field adopted to describe the hadronic matter phase. It is shown that the larger the vector coupling constant , the lower the threshold density for the appearance of strange quarks. For a sufficiently small value of the vector coupling constant, the functions of the mass dependence on the baryonic chemical potential have regions of ambiguity which leads to a phase transition in non-strange quark matter with an abrupt change in the baryon number density. We show that within the framework of the NJL model, the hypothesis on the absolute stability of strange quark matter is not realized. In order to describe the phase transition from hadronic matter to quark matter, the Maxwell's construction is applied. It is shown that the greater the vector coupling, the greater the stiffness of the EOS for quark matter and the phase transition pressure. Our results indicate that the infinitesimal core of the quark phase, formed in the center of the neutron star, is stable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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