Probing the Equation of State of Nuclear Matter via Neutron Star Asteroseismology
Probing the Equation of State of Nuclear Matter via Neutron Star Asteroseismology
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DOI：
10.1103/physrevlett.108.201101
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发表时间：
2012-05-18
影响因子：
8.6
通讯作者：
Oyamatsu, Kazuhiro
中科院分区：
文献类型：
--
作者：
Sotani, Hajime;Nakazato, Ken'ichiro;Oyamatsu, Kazuhiro
我们通过广义相对论计算中子星地壳基本扭转振荡的频率，其中我们重点关注从宏观核模型获得的晶体特性，其方式取决于核物质的状态方程。我们发现计算的频率对对称能量的密度依赖性敏感，但几乎与对称核物质的不可压缩性无关。通过将软伽马射线中继器观测到的巨型耀斑中的最低频率准周期振荡确定为基本扭转模式，并考虑到计算频率对恒星模型的依赖性，我们提供了对称能密度导数的下限，L 类似于或等于 50 MeV。
We general-relativistically calculate the frequency of fundamental torsional oscillations of neutron star crusts, where we focus on the crystalline properties obtained from macroscopic nuclear models in a way that is dependent on the equation of state of nuclear matter. We find that the calculated frequency is sensitive to the density dependence of the symmetry energy, but almost independent of the incompressibility of symmetric nuclear matter. By identifying the lowest-frequency quasiperiodic oscillation in giant flares observed from soft gamma-ray repeaters as the fundamental torsional mode and allowing for the dependence of the calculated frequency on stellar models, we provide a lower limit of the density derivative of the symmetry energy as L similar or equal to 50 MeV.