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arXiv 2408.02671gr-qc
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由于进动双黑洞铃振建模不当导致的系统性偏差

Systematic bias due to mismodelling precessing binary black hole ringdown

Cheng Foo, Eleanor Hamilton

AI总结:

本文揭示共进动参考系中铃振频率建模不当会造成参数估计与IMR一致性检验的系统性偏差,并用IMRPhenomXPHM结合Fisher分析和注入研究界定其影响。

摘要:

精确的波形建模对引力波天文学中的参数估计至关重要,影响我们对源属性的理解以及对广义相对论的检验。在自旋未对齐的双黑洞(BBH)系统中,轨道角动量与自旋角动量的进动给引力波波形建模带来了复杂挑战。当前的进动双黑洞波形模型采用随双星共同进动的共进动参考系。本文研究了源于共进动参考系中铃振频率建模不当的一种偏差来源。我们发现,这种共进动参考系铃振频率的建模不当会在参数估计中引入系统性偏差,尤其对高质量系统以及广义相对论的旋近—并合—铃振(IMR)一致性检验影响明显。我们利用波形模型 IMRPhenomXPHM,在整个参数空间中通过 Fisher 矩阵分析开展 IMR 一致性检验,并进行完整的注入信号参数估计研究。结果表明,该建模不当对具有高质量比、高自旋大小和高倾斜自旋的双黑洞系统影响尤为突出。这些发现意味着,所有未解决该问题的波形模型都会存在不一致性。

英文摘要:

Accurate waveform modelling is crucial for parameter estimation in gravitational wave astronomy, impacting our understanding of source properties and the testing of general relativity. The precession of orbital and spin angular momenta in binary black hole (BBH) systems with misaligned spins presents a complex challenge for gravitational waveform modelling. Current precessing BBH waveform models employ a co-precessing frame, which precesses along with the binary. In this paper, we investigate a source of bias stemming from the mismodelling of ringdown frequency in the co-precessing frame. We find that this mismodelling of the co-precessing frame ringdown frequency introduces systematic biases in parameter estimation, for high mass systems in particular, and in the Inspiral-Merger-Ringdown (IMR)-consistency test of general relativity. Employing the waveform model IMRPhenomXPHM, we conduct an IMR-consistency test using a Fisher matrix analysis across parameter space, as well as full injected signal parameter estimation studies. Our results show that this mismodelling particularly affects BBH systems with high mass ratios, high spin magnitudes, and highly inclined spins. These findings suggest inconsistencies for all waveform models which do not address this issue.

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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