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arXiv 1902.04616gr-qc
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地壳状态方程对GW170817分析的影响

The impact of the crust equation of state on the analysis of GW170817

Rossella Gamba, Jocelyn S. Read, Leslie E. Wade

摘要:

GW 170817是Advanced LIGO和Virgo观测到的第一颗中子星-中子星合并,它的探测和随后的分析代表了引力波(GW)数据对理解致密物质的首次贡献。通过光谱分解对两颗中子星的状态方程(EOS)的高密度部分进行参数化,并对最大质量值施加下限,导致对恒星半径的估计为$R_1 = 11.9_{- 1.4}^{+ 1.4}$ km和$R_2 = 11.9_{- 1.4}^{+ 1.4}$ km。然而,这些数值没有考虑到由于选择地壳低密度地球观测系统而产生的任何不确定性,该系统是固定的,以重现SLy地球观测系统模型。我们在这里重新分析GW 170817数据,并建立不同的地壳模型不会强烈影响质量或潮汐变形的中子星:这是不可能区分低密度模型与GW分析。然而,地壳确实对推断的半径有影响。我们预测的系统误差,由于这种影响,使用中子星结构方程,并比较预测的结果,从完整的参数估计运行。对于GW 170817,这个系统误差影响半径估计值0.3 km,大约是NS半径的$3\%$。

英文摘要:

The detection of GW170817, the first neutron star-neutron star merger observed by Advanced LIGO and Virgo, and its following analyses represent the first contributions of gravitational wave (GW) data to understanding dense matter. Parameterizing the high density section of the equation of state (EOS) of both neutron stars through spectral decomposition, and imposing a lower limit on the maximum mass value, led to an estimate of the stars' radii of $R_1 = 11.9_{- 1.4}^{+ 1.4}$ km and $R_2 = 11.9_{- 1.4}^{+ 1.4}$ km. These values do not, however, take into account any uncertainty owed to the choice of the crust low-density EOS, which was fixed to reproduce the SLy EOS model. We here re-analyze GW170817 data and establish that different crust models do not strongly impact the mass or tidal deformability of a neutron star: it is impossible to distinguish between low-density models with GW analysis. However, the crust does have an effect on the inferred radius. We predict the systematic error due to this effect using neutron star structure equations, and compare the prediction to results from full parameter estimation runs. For GW170817, this systematic error affects the radius estimate by 0.3 km, approximately $3\%$ of the NS radii.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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