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arXiv 1503.07442nucl-thastro-ph.HEhep-ph
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用于天体物理学应用的矢量相互作用增强袋模型

Vector interaction enhanced bag model for astrophysical applications

Thomas Klahn, Tobias Fischer

摘要:

在天体物理学中夸克物质的研究中,热力学袋模型(tdBAG)得到了广泛的应用。尽管它取得了成功,但它未能解释量子色动力学(QCD)所期望的各种现象。我们建议一个简单的扩展tdBAG,以考虑动力学破缺的手征对称性和矢量相互作用的影响明确。至于tdBAG的模型模仿限制在一个唯象的方法。它是基于Nambu-Jona-Lasinio(NJL)模型在有限密度的分析。此外,我们演示了如何NJL和袋模型在这一制度遵循更普遍的和QCD为基础的框架Dyson-Schwinger(DS)方程在介质中假设一个简单的胶子接触相互作用。基于这个简单而新颖的模型,我们构造了夸克强子杂化状态方程(EoS),系统地研究了手征相变和解除禁闭相变、$s$ -夸克的出现以及矢量相互作用的作用.我们进一步研究这些方面的物质在β平衡在零温度下,特别关注当前的~2太阳质量的最大质量约束的中子星。我们的方法表明,目前唯一的理论证据为稳定的奇怪的物质的假设是一个人工制品的tdBAG和结果忽略了动力学破缺的手征对称性。

英文摘要:

For quark matter studies in astrophysics the thermodynamic bag model (tdBAG) has been widely used. Despite its success it fails to account for various phenomena expected from Quantum-Chromo-Dynamics (QCD). We suggest a straightforward extension of tdBAG in order to take the dynamical breaking of chiral symmetry and the influence of vector interactions explicitly into account. As for tdBAG the model mimics confinement in a phenomenological approach. It is based on an analysis of the Nambu--Jona-Lasinio (NJL) model at finite density. Furthermore, we demonstrate how NJL and bag models in this regime follow from the more general and QCD based framework of Dyson-Schwinger (DS) equations in medium by assuming a simple gluon contact interaction. Based on our simple and novel model, we construct quark hadron hybrid equations of state (EoS) and study systematically chiral and deconfinement phase transitions, the appearance of $s$-quarks and the role of vector interaction. We further study these aspects for matter in beta-equilibrium at zero temperature, with particular focus on the current ~2 solar masses maximum mass constraint for neutron stars. Our approach indicates that the currently only theoretical evidence for the hypothesis of stable strange matter is an artifact of tdBAG and results from neglecting the dynamical breaking of chiral symmetry.

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