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arXiv 2305.18528gr-qc
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具有保证精确覆盖率的神经后验估计:GW150914 的铃振

Neural Posterior Estimation with guaranteed exact coverage: the ringdown of GW150914

Marco Crisostomi, Kallol Dey, Enrico Barausse, Roberto Trotta

AI总结:

本文利用基于掩码自回归流的模拟推断流程分析 GW150914 铃振,并通过注入模拟校准后验以实现精确频率派覆盖,结果显示第一泛音存在的证据仅约 2σ。

摘要:

我们使用基于掩码自回归流的基于模拟的推断流程,分析了首个被探测到的黑洞并合事件 GW150914 的铃振阶段。我们获得了铃振参数的近似边缘后验分布,即质量、自旋,以及主导模式及其第一泛音的振幅和相位。由于我们的方法具有局部摊销的性质,我们能够通过注入模拟来校准后验,从而产生对真实值具有保证(即精确)频率派覆盖率的后验区域。对于 GW150914,即使假设铃振从振幅峰值处开始,我们校准后的后验也仅为泛音的存在提供了微弱证据(约 2σ)。

英文摘要:

We analyze the ringdown phase of the first detected black-hole merger, GW150914, using a simulation-based inference pipeline based on masked autoregressive flows. We obtain approximate marginal posterior distributions for the ringdown parameters, namely the mass, spin, and the amplitude and phases of the dominant mode and its first overtone. Thanks to the locally amortized nature of our method, we are able to calibrate our posteriors with injected simulations, producing posterior regions with guaranteed (i.e. exact) frequentist coverage of the true values. For GW150914, our calibrated posteriors provide only mild evidence (~ 2 sigma) for the presence of an overtone, even if the ringdown is assumed to start at the peak of the amplitude.

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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