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arXiv 2109.02728gr-qc
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快速推断引力波参数的外差近似法

Heterodyned Likelihood for Rapid Gravitational Wave Parameter Inference

Neil J. Cornish

摘要:

传统上,推断引力波信号的源特性是非常计算密集和耗时的。近年来,已经开发了几种技术,可以显着降低计算成本,同时提供快速和准确的参数推断。这些技术中最强大的一种是外差似然,它使用参考波形来基带似然计算。这里提出了一种有效的外差似然实现方法,可用于各种信号类型以及地基和天基干涉仪。相对于直接计算的可能性的计算节省取决于系统在两个和四个数量级之间变化。对于低质量的系统,如中子星双星,这种节省是最大的。外差过程可以结合校准不确定性和噪声功率谱的边缘化。

英文摘要:

Inferring the source properties of a gravitational wave signal has traditionally been very computationally intensive and time consuming. In recent years, several techniques have been developed that can significantly reduce the computational cost while delivering rapid and accurate parameter inference. One of the most powerful of these techniques is the heterodyned likelihood, which uses a reference waveform to base-band the likelihood calculation. Here an efficient implementation of the heterodyned likelihood is presented that can be used for a wide range of signal types and for both ground based and space based interferometers. The computational savings relative to direct calculation of the likelihood vary between two and four orders of magnitude depending on the system. The savings are greatest for low mass systems such as neutron star binaries. The heterodyning procedure can incorporate marginalization over calibration uncertainties and the noise power spectrum.

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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