Compact stars in a SU(3) Quark-Meson Model
Compact stars in a SU(3) Quark-Meson Model
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DOI：
10.1103/physrevd.92.045022
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发表时间：
2015-06
影响因子：
5
通讯作者：
Andreas Zacchi;Rainer Stiele;J. Schaffner-Bielich
中科院分区：
文献类型：
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作者：
Andreas Zacchi;Rainer Stiele;J. Schaffner-Bielich
最近观测到的大质量恒星PSR J1614-2230和PSR J 0348 +0432的质量约为两个太阳质量，这意味着致密恒星核心致密物质的性质受到很强的约束。有效的QCD模型旨在描述中子星星物质，从而可以大大限制。在此背景下，本文讨论了一个基于SU（3）线性$\sigma$-模型的手征夸克介子模型，该模型具有真空压力和矢量介子交换.它的各种条款和参数的状态方程和紧凑型恒星的最大质量的影响划定检查是否纯夸克星与两个太阳质量的方法是可行的。大的矢量介子耦合常数和小的真空压力允许两个或更多太阳质量的最大质量。然而，由绝对稳定的奇异夸克物质构成的纯夸克星，即所谓的奇异星，其参数范围很小。
The recent observations of the massive pulsars PSR J1614-2230 and of PSR J0348+0432 with about two solar masses implies strong constraints on the properties of dense matter in the core of compact stars. Effective models of QCD aiming to describe neutron star matter can thereby be considerably constrained. In this context, a chiral quark-meson model based on a SU(3) linear $\sigma$-model with a vacuum pressure and vector meson exchange is discussed in this work. The impact of its various terms and parameters on the equation of state and the maximum mass of compact stars are delineated to check whether pure quark stars with two solar masses are feasible within this approach. Large vector meson coupling constant and a small vacuum pressure allow for maximum masses of two or more solar masses. However, pure quark stars made of absolutely stable strange quark matter, so called strange stars, turn out to be restricted to a quite small parameter range.