arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2009.08467gr-qcastro-ph.HE
收藏

从双星中子星信号引力波推断潮汐参数和状态方程的波形系统学

Waveform systematics in the gravitational-wave inference of tidal parameters and equation of state from binary neutron star signals

Rossella Gamba, Matteo Breschi, Sebastiano Bernuzzi, Michalis Agathos, Alessandro Nagar

摘要:

来自双中子星凝聚体的引力波信号在其潮汐特征中携带着恒星状态方程的信息。潮汐参数(或直接状态方程)的推断中的一个主要问题是由波形近似引入的系统误差。我们使用自下而上的方法,规范不变的相位分析和Fisher信息矩阵的基础上,研究波形系统学,并帮助识别参数估计的偏差。15个不同的二进制模拟分析表明,在当前的波形模型的系统性占主导地位的信噪比(SNR)${\gtrsim} 80$的统计误差。这意味着推断简化潮汐参数的偏差大于统计$90\%$可分辨间隔。例如,中子星半径可以在信噪比为80时限制在${\sim} 5\%$水平,而系统学可以在${\sim} 10\%$水平。我们将我们的方法应用于GW 170817(SNR ${\sim}30$),并确认不存在显著的系统效应。使用最佳的频率范围的分析,我们估计的中子星半径为$12.5^{+1.1}_{-1.8}\,$公里。后者是一致的电磁通知之前和最近的NICER测量。探索SNR ${\gtrsim}100$鉴于第三代检测器,我们发现,所有目前的波形模型导致至少1-西格玛的差异,在减少潮汐参数的推断(对于后者的任何值)。我们的结论是,目前的波形模型,包括那些从数值相对论,是不足以推断状态方程的最响亮的(和潜在的最翔实的)事件,将观察到先进的和第三代探测器。

英文摘要:

Gravitational-wave signals from binary neutron star coalescences carry information about the star's equation of state in their tidal signatures. A major issue in the inference of the tidal parameters (or directly of the equation of state) is the systematic error introduced by the waveform approximants. We use a bottom-up approach based on gauge-invariant phase analysis and the Fisher information matrix to investigate waveform systematics and help identifying biases in parameter estimation. A mock analysis of 15 different binaries indicates that systematics in current waveform models dominate over statistical errors at signal-to-noise ratio (SNR) ${\gtrsim} 80$. This implies biases in the inference of the reduced tidal parameter that are are larger than the statistical $90\%$ credible-intervals. For example, while the neutron-star radius could be constrained at ${\sim} 5\%$ level at SNR 80, systematics can be at the ${\sim} 10\%$ level. We apply our approach to GW170817 (SNR ${\sim}30$) and confirm that no significant systematic effects are present. Using an optimal frequency range for the analysis, we estimate a neutron-star radius of $12.5^{+1.1}_{-1.8}\,$km. The latter is consistent with an electromagnetic-informed prior and the recent NICER measurement. Exploring SNR ${\gtrsim}100$ in view of third-generation detectors, we find that all the current waveform models lead to differences of at least 1-sigma in the inference of the reduced tidal parameter (for any value of the latter). We conclude that current waveform models, including those from numerical relativity, are insufficient to infer the equation of state in the loudest (and potentially most informative) events that will be observed by advanced and third generation detectors.

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。

↑