Constraining nuclear matter parameters with GW170817
Constraining nuclear matter parameters with GW170817
复制标题
DOI：
10.1103/physrevd.99.043010
复制
发表时间：
2018-12
影响因子：
5
通讯作者：
Zack Carson;A. Steiner;Kent Yagi
中科院分区：
文献类型：
--
作者：
Zack Carson;A. Steiner;Kent Yagi
双中子星合并事件GW170817引力波的潮汐测量使我们能够探索受到天体物理系统学影响较小的核物理，而不是通过电磁波观测测量中子星半径。最近的一项工作发现，中子星的潮汐变形率和与状态方程相关的某些核参数组合之间存在很强的相关性。然后利用这些关系从GW170817导出了这些参数的界限，假设这些关系和中子星质量是完全已知的。在这里，我们通过考虑几个新的因素来扩展这项重要的工作：(1)更广泛的一类状态方程；(2)与GW170817直接测量的质量加权潮汐变形性的关联；(3)这些关系如何依赖于二元质量比；(4)关联关系中状态方程变化的不确定性；(5)采用GW170817更新的潮汐变形性测量。基于这些新的考虑，我们发现GW170817核参数(核饱和密度下的不可压缩系数$K_0，其斜率$M_0和对称能曲率$K_{mathm{sym}，0}$)的界限是81 MeV$\leq K_0\leq$362 MeV，1556 MeV$\leq M_0\leq$4971 MeV和-254 MeV$\leq K_\mathm{sym，0}\leq$27 MeV。
The tidal measurement of gravitational waves from the binary neutron star merger event GW170817 allows us to probe nuclear physics that suffers less from astrophysical systematics compared to neutron star radius measurements with electromagnetic wave observations. A recent work found strong correlation among neutron-star tidal deformabilities and certain combinations of nuclear parameters associated with the equation of state. These relations were then used to derive bounds on such parameters from GW170817 assuming that the relations and neutron star masses are known exactly. Here, we expand on this important work by taking into account a few new considerations: (1) a broader class of equations of state; (2) correlations with the mass-weighted tidal deformability that was directly measured with GW170817; (3) how the relations depend on the binary mass ratio; (4) the uncertainty from equation of state variation in the correlation relations; (5) adopting the updated tidal deformability measurement from GW170817. Upon these new considerations, we find GW170817 bounds on nuclear parameters (the incompressibility $K_0$, its slope $M_0$ and the curvature of symmetry energy $K_{\mathrm{sym},0}$ at nuclear saturation density) to be 81 MeV $\leq K_0 \leq$ 362 MeV, 1556 MeV $\leq M_0 \leq$ 4971 MeV, and -254 MeV $\leq K_\mathrm{sym,0} \leq$ 27 MeV, which are more conservative than previously found with systematic errors more properly taken into account.