论文标题
在参数空间中定位对象模型
Locating ergostar models in parameter space
论文作者
论文摘要
最近，我们已经表明，具有可压缩和因果状态的状态方程动态稳定的牙齿溶液（含有内核的平衡中子星）[A. Tsokaros，M。Ruiz，L。Sun，S。L. Shapiro和K.Uryū，物理。莱特牧师。 123，231103（2019）]。这些恒星是超大的，差异旋转的，高度紧凑。在这项工作中，我们对平衡模型进行了系统的研究，以定位在参数空间中的主角位置。我们采用四个状态方程，这些状态在最大刚性核心的匹配密度上有所不同。通过构建具有不同程度的均匀旋转和差分旋转的大量模型，我们确定了对王者出现的参数。我们发现，动态稳定的对决的出现最有利的条件是靠近恒星表面（即类似于自结界夸克恒星）的有限密度，并且较小的差异旋转。
Recently, we have shown that dynamically stable ergostar solutions (equilibrium neutron stars that contain an ergoregion) with a compressible and causal equation of state exist [A. Tsokaros, M. Ruiz, L. Sun, S. L. Shapiro, and K. Uryū, Phys. Rev. Lett. 123, 231103 (2019)]. These stars are hypermassive, differentially rotating, and highly compact. In this work, we make a systematic study of equilibrium models in order to locate the position of ergostars in parameter space. We adopt four equations of state that differ in the matching density of a maximally stiff core. By constructing a large number of models both with uniform and differential rotation of different degrees, we identify the parameters for which ergostars appear. We find that the most favorable conditions for the appearance of dynamically stable ergostars are a significant finite density close to the surface of the star (i.e., similar to self-bound quark stars) and a small degree of differential rotation.
