Building a realistic neutron star from holography
Building a realistic neutron star from holography
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DOI：
10.1103/physrevd.105.034022
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发表时间：
2021-11
影响因子：
5
通讯作者：
Nicolas Kovensky;Aaron R. Poole;A. Schmitt
中科院分区：
文献类型：
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作者：
Nicolas Kovensky;Aaron R. Poole;A. Schmitt
我们采用最近改进的描述致密重子物质的Witten-SakaiSugimoto模型来构建中子星。与以前的全息方法相比，同位旋不对称的存在使我们能够实现β平衡和电荷中性。因此，我们能够模拟地壳的星星内相同的形式主义和计算的位置的地壳核心过渡动态。在表明重子的简单点状近似不能满足天体物理约束后，我们证明了我们改进的描述确实可以解释中子星满足当前的质量，半径和潮汐变形性的实验约束。然而，我们也指出了参数拟合和大Nc工件中的紧张局势，并讨论了未来如何解决这些问题。
We employ the recently improved description of dense baryonic matter within the Witten-SakaiSugimoto model to construct neutron stars. In contrast to previous holographic approaches, the presence of an isospin asymmetry allows us to implement beta equilibrium and electric charge neutrality. As a consequence, we are able to model the crust of the star within the same formalism and compute the location of the crust-core transition dynamically. After showing that a simple pointlike approximation for the baryons fails to satisfy astrophysical constraints, we demonstrate that our improved description does account for neutron stars that meet the current experimental constraints for mass, radius, and tidal deformability. However, we also point out tensions in the parameter fit and large-Nc artifacts and discuss how to potentially resolve them in the future.