论文标题
差异旋转恒星的平衡序列具有合并后的旋转轮廓
Equilibrium sequences of differentially rotating stars with post-merger-like rotational profiles
论文作者
论文摘要
我们提出了旋转相对论恒星的平衡序列，该序列是由Uryu等人提出的新旋转定律构建的。 （2017）。我们选择由二进制中子星级合并残余的模拟动机的旋转参数，但否则采用了冷的，相对论的n = 1多环境EOS，以便与使用Komatsu，Eriguchi和Hachisu（1989）旋转法的已发表的平衡序列进行详细比较。我们发现，选择旋转定律对平衡模型质量的影响很小，并且对它们的半径影响更大。新旋转定律的多功能性使我们能够构建与合并残余物观察到的相似旋转曲线和轴比的模型，同时又是准球形的。更具体地说，我们以不同程度的差异旋转构建平衡序列变化，并识别A型和C型溶液，类似于Ansorg，Gondek-Rosinska和Villain（2009）的分类中的相应类型。尽管我们的模型是完全一般相对论结构方程的高度准确的解决方案，但我们证明，对于与合并残留相关的模型，IWM-CFC近似仍然可接受准确性。
We present equilibrium sequences of rotating relativistic stars, constructed with a new rotation law that was proposed by Uryu et al. (2017). We choose rotational parameters motivated by simulations of binary neutron star merger remnants, but otherwise adopt a cold, relativistic N=1 polytropic EOS, in order to perform a detailed comparison to published equilibrium sequences that used the Komatsu, Eriguchi and Hachisu (1989) rotation law. We find a small influence of the choice of rotation law on the mass of the equilibrium models and a somewhat larger influence on their radius. The versatility of the new rotation law allows us to construct models that have a similar rotational profile and axis ratio as observed for merger remnants, while at the same time being quasi-spherical. More specifically, we construct equilibrium sequence variations with different degrees of differential rotation and identify type A and type C solutions, similar to the corresponding types in the classification of Ansorg, Gondek-Rosinska and Villain (2009). While our models are highly accurate solutions of the fully general relativistic structure equations, we demonstrate that for models relevant to merger remnants the IWM-CFC approximation still maintains an acceptable accuracy.
