Strange Stars in the Vector Interaction Enhanced Bag Model
Strange Stars in the Vector Interaction Enhanced Bag Model
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DOI：
10.3390/particles2040027
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发表时间：
2019-10
期刊：
影响因子：
1.4
通讯作者：
M. Salinas;T. Klähn;P. Jaikumar
中科院分区：
文献类型：
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作者：
M. Salinas;T. Klähn;P. Jaikumar
稠密夸克物质的矢量相互作用增强 Bag 模型 (vBag) 通过结合动态手性对称破缺 (D χ SB) 和矢量排斥的效应，扩展了常用的热力学 Bag 模型 (tdBag)。受奇怪物质的稳定性与手性对称性破缺 (D χ SB) 的张力的启发，我们在这项工作中检查了 vBag 模型中参数空间的稳定性。假设手性转变发生在足够低的密度下，我们将奇异物质的稳定区域确定为有效 Bag 常数和矢量耦合的函数。作为天体物理学应用，我们在参数空间的该区域中构造最大质量 M max 和最大质量 R max 处的半径的轮廓。我们还通过计算径向振荡谱来研究vBag模型中最大质量在2M ⊙范围内的奇异恒星的稳定性，并与tdBag模型的结果进行比较，发现一些显着差异。
The vector interaction enhanced Bag model (vBag) for dense quark matter extends the commonly used thermodynamic Bag model (tdBag) by incorporating effects of dynamical chiral symmetry breaking (D χ SB) and vector repulsion. Motivated by the suggestion that the stability of strange matter is in tension with chiral symmetry breaking (D χ SB) we examine the parameter space for its stability in the vBag model in this work. Assuming the chiral transition occurs at sufficiently low density, we determine the stability region of strange matter as a function of the effective Bag constant and the vector coupling. As an astrophysical application, we construct contours of maximum mass M max and radius at maximum mass R max in this region of parameter space. We also study the stability of strange stars in the vBag model with maximum mass in the 2 M ⊙ range by computing the spectrum of radial oscillations, and comparing to results from the tdBag model, find some notable differences.