Ensembles of unified crust and core equations of state in a nuclear-multimessenger astrophysics environment

Ensembles of unified crust and core equations of state in a nuclear-multimessenger astrophysics environment
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核多信使天体物理环境中统一地壳和核心状态方程系综

DOI:
10.1140/epja/s10050-022-00710-0
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发表时间:
2022
期刊:
The European Physical Journal A
影响因子:
--
通讯作者:
Sanford, J.
Sanford, J.
中科院分区:
--
文献类型:
--
作者:
Newton, W. G.;Balliet, L.;Budimir, S.;Crocombe, G.;Douglas, B.;Head, T.;Langford, Z.;Rivera, L.;Sanford, J.

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我们提出了一个统一的中子星星地壳和核心的状态方程,构造使用扩展的Skyrme能量密度泛函通过地壳和外核,并附加两个分段多面体在较高的密度。状态方程的参数由对称能J、Land、1.338 M星的转动惯量和最大中子星星质量的密度展开式中的前三个系数确定。我们构建了一个合奏与统一的先验所有五个参数,然后应用数据过滤器的合奏,探索从PREX与天体物理测量的半径和潮汐变形从NICER和LIGO/VIRGO中子皮肤数据相结合的效果。直接使用EDF计算中子皮。我们表明,核数据和天体物理数据发挥的作用,在约束地壳性质,如质量,厚度和惯性矩的地壳和核面食层在其中,和天体物理数据更好地constrainsthan PREX数据。
We present an ensemble of unified neutron star crust and core equations of state, constructed using an extended Skyrme energy density functional through the crust and outer core, and appended by two piecewise polytropes at higher densities. The equations of state are parameterized by the first three coefficients in the density expansion of the symmetry energyJ,Land, the moment of inertia of a 1.338 Mstarand the maximum neutron star mass. We construct an ensemble with uniform priors on all five parameters, and then apply data filters to the ensemble to explore the effect of combining neutron skin data from PREX with astrophysical measurements of radii and tidal deformabilities from NICER and LIGO/VIRGO. Neutron skins are calculated directly using the EDFs. We demonstrate that both the nuclear data and astrophysical data play a role in constraining crust properties such as the mass, thickness and moment of inertia of the crust and the nuclear pasta layers therein, and that astrophysical data better constrainsthan PREX data.
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