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arXiv 2605.04579gr-qc
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自旋先验对广义相对论参数化检验的影响

The Impact of Spin Priors on Parameterized Tests of General Relativity

College of Physics and Electronic Information Engineering, Guilin University of Technology(桂林理工大学物理与电子信息工程学院)

Tian-Hao Wu, Shu-Jun Rong

AI总结:

该研究系统评估了自旋先验选择对广义相对论参数化检验的影响,发现偏差参数总体稳健但受特定事件影响,强调在解释偏离时应考虑先验效应。

摘要:

自旋先验在引力波参数估计中起着基础性作用,然而其对广义相对论(GR)参数化检验的影响仍未得到充分理解。我们利用真实引力波事件,系统研究了自旋先验选择如何影响1.5PN偏差参数$\delta \hat{\phi}_3$。先验诱导效应通过Jensen-Shannon散度和后验中位数偏移进行量化。我们发现$\chi_p$对自旋先验的敏感度显著高于$\chi_{\rm eff}$,而$\delta \hat{\phi}_3$总体上是稳健的,但在低信息量情况下可能表现出较大偏移。GW231123_135430显示出特别强的敏感性,但其推断性质受波形模型和事件特定系统效应的影响,因此对受该事件强烈影响的结果进行解释时应保持谨慎。当$\delta \hat{\phi}_3$被纳入参数估计模型时,$\chi_{\rm eff}$与$\delta \hat{\phi}_3$的先验敏感性之间出现强相关性,这与它们在1.5PN阶的部分简并性一致,而$\chi_p$仍保持弱相关。留一法测试表明,GW231123_135430显著影响相关性强度,但移除该事件后相关性依然存在。这些结果表明,自旋先验选择可能传播到GR参数化检验中,在解释表观偏离GR的结果时应仔细考虑这一因素。

英文摘要:

Spin priors play a fundamental role in gravitational-wave parameter estimation, yet their impact on parameterized tests of General Relativity (GR) remains insufficiently understood. We systematically investigate how spin-prior choices affect the 1.5PN deviation parameter $δ\hatϕ_3$ using real gravitational-wave events. Prior-induced effects are quantified through the Jensen--Shannon divergence and posterior median shifts. We find that $χ_p$ is significantly more sensitive to the spin prior than $χ_{\rm eff}$, while $δ\hatϕ_3$ is generally robust but can exhibit larger shifts in low-information regimes. GW231123_135430 shows particularly strong sensitivity, but its inferred properties are subject to waveform-model and event-specific systematics, warranting caution in interpreting results strongly influenced by this event. When $δ\hatϕ_3$ is included in the parameter-estimation model, a strong correlation emerges between the prior sensitivities of $χ_{\rm eff}$ and $δ\hatϕ_3$, consistent with their partial degeneracy at the 1.5PN order, whereas $χ_p$ remains weakly correlated. A leave-one-out test shows that GW231123\_135430 significantly affects the correlation strength, but the correlation persists when this event is removed. These results demonstrate that spin-prior choices can propagate into parameterized tests of GR and should be carefully accounted for when interpreting apparent deviations from GR.

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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