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arXiv 2006.09401hep-thgr-qchep-ph
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全息QCD模型中的Phase diagram和致密星

Phase diagram and compact stars in a holographic QCD model

Luis A. H. Mamani, Cesar V. Flores, Vilson T. Zanchin

摘要:

利用全息模型研究了重夸克系统的热力学和相图。从这样的模型,我们得到一个状态方程,并探讨其适用于天体物理条件。为此,我们在量子色动力学(QCD)的Einstein-Maxwell-Dilaton(EMD)全息模型的背景下工作。首先,我们证明了一级跃迁线终止处的临界点的存在,然后,我们计算了状态方程的解析表达式。此外,为了研究致密星的整体性质,如总引力质量和半径,利用状态方程求解了TOV方程。数值结果表明,我们的状态方程能够再现混合星的预期行为。我们的主要结论是,通过使用一个状态方程出现在QCD的EMD全息模型的框架,它是可能的,以获得夸克物质的性质,它也是可能的程序扩展到天体物理的应用。

英文摘要:

A holographic model is used to investigate the thermodynamics and the phase diagram of a heavy quarks system. From such a model we obtain an equation of state and explore its applicability in astrophysical conditions. For this objective, we work in the context of the Einstein-Maxwell-Dilaton (EMD) holographic model for quantum chromodynamics (QCD). At first, we show the existence of a critical point where the first-order transitions line ends, later on, we calculated an analytic expression for the equation of state. Additionally, with the aim of investigating the global properties of compact stars, such as the total gravitational mass and radius, the equation of state is used to solve the Tolman-Oppenheimer-Volkov (TOV) equations for stellar structure. The numerical results show that our equation of state is able to reproduce the expected behavior of hybrid stars. Our main conclusion is that, by using an equation of state emerging in the framework of the EMD holographic model for QCD, it is possible to obtain quark matter properties and that it is also possible to extend the procedure to astrophysical applications.

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