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arXiv 2102.02713gr-qcastro-ph.HE
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通过时间和频率上的多声部分解计算极端质量比旋近的绝热波形

Adiabatic waveforms for extreme mass-ratio inspirals via multivoice decomposition in time and frequency

Scott A. Hughes, Niels Warburton, Gaurav Khanna, Alvin J. K. Chua, Michael L. Katz

AI总结:

本文提出将极端质量比旋近总波形分解为多个简单演化的声部,通过拼接测地轨道快照高效构建绝热波形,并首次在强场辐射反作用下计算一般轨道EMRI波形,同时给出时频域分析与高阶稳相近似处理方法。

摘要:

我们通过将一系列波形快照“拼接”在一起,计算极端质量比旋近(EMRIs)的绝热波形,其中每个快照对应于一条特定的测地轨道。我们证明,复杂的总波形可以视为多个“声部”之和。每个声部在长时间尺度上以简单的方式演化,这一特性可被利用来高效地生成能够忠实编码EMRI系统性质的波形模型。我们考察了不同轨道几何形状的示例:球面轨道、赤道偏心轨道,以及一个一般(倾斜且偏心)轨道的示例。据我们所知,这是首次使用强场辐射反作用计算一般EMRI波形。我们在时域和频域中检验了波形。尽管EMRIs演化足够缓慢,使得对傅里叶变换的稳相近似(SPA)有效,但对于某些声部,SPA计算必须进行到更高阶,因为它们的瞬时频率可能从向前啁啾($\dot f > 0$)变为向后啁啾($\dot f < 0$)。我们发展的方法最终可以扩展到更完整的EMRI波形模型,例如纳入绝热近似所忽略的效应,如保守自力和自旋-曲率耦合。

英文摘要:

We compute adiabatic waveforms for extreme mass-ratio inspirals (EMRIs) by "stitching" together a long inspiral waveform from a sequence of waveform snapshots, each of which corresponds to a particular geodesic orbit. We show that the complicated total waveform can be regarded as a sum of "voices." Each voice evolves in a simple way on long timescales, a property which can be exploited to efficiently produce waveform models that faithfully encode the properties of EMRI systems. We look at examples for a range of different orbital geometries: spherical orbits, equatorial eccentric orbits, and one example of generic (inclined and eccentric) orbits. To our knowledge, this is the first calculation of a generic EMRI waveform that uses strong-field radiation reaction. We examine waveforms in both the time and frequency domains. Although EMRIs evolve slowly enough that the stationary phase approximation (SPA) to the Fourier transform is valid, the SPA calculation must be done to higher order for some voices, since their instantaneous frequency can change from chirping forward ($\dot f > 0$) to chirping backward ($\dot f < 0$). The approach we develop can eventually be extended to more complete EMRI waveform models, for example to include effects neglected by the adiabatic approximation such as the conservative self force and spin-curvature coupling.

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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