区分双黑洞旋进波形中的透镜调制与进动调制
Distinguishing lensing and precessional modulation in binary black-hole inspiral waveforms
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中文总结 AI 辅助
本文研究单个L形引力波探测器区分双黑洞旋进波形中透镜调制与进动调制的能力，发现短时间延迟下进动可模拟透镜效应，排除进动对识别真正透镜系统至关重要。
中文摘要 AI 辅助
双黑洞（BBHs）在旋进并合过程中发射引力波（GWs）。这些引力波可能被视线方向上的大尺度结构引力透镜化，从而可能产生同一源的多个像，这些像之间具有由透镜几何决定的固定时间延迟。随着双黑洞旋进，引力波频率增加，导致多个像之间发生连续的相长和相消干涉。双黑洞还具有自旋 $\mathbf{S}_i$，这些自旋可能与其轨道角动量 $\mathbf{L}$ 不对齐。随着双黑洞旋进，这些不对齐的自旋导致 $\mathbf{L}$ 绕总角动量 $\mathbf{J}$ 进动，从而调制引力波发射，类似于由不对齐喷流旋转进出视线方向所产生的脉冲星发射。我们研究了单个L形引力波探测器区分这两种调制来源的能力。我们发现，当两个像之间的时间延迟足够短，以至于在引力波信号处于探测器灵敏度频带期间产生的干涉条纹少于三条时，进动调制可以模拟具有可比放大率的两个像之间的透镜调制。由于在中等红移处强透镜对于引力波源是罕见的，而在某些形成通道中产生的双黑洞中不对齐自旋是常见的，因此排除进动调制对于识别真正的透镜系统至关重要。
英文摘要
Binary black holes (BBHs) emit gravitational waves (GWs) as they inspiral towards merger. These GWs can be gravitationally lensed by large-scale structure along the line of sight, potentially creating multiple images of the same source with fixed time delays determined by the lensing geometry. As the BBHs inspiral, the GW frequency increases, leading to successive constructive and destructive interference between the multiple images. BBHs also have spins $\mathbf{S}_i$ that may be misaligned with their orbital angular momentum $\mathbf{L}$. As the BBHs inspiral, these misaligned spins cause $\mathbf{L}$ to precess about the total angular momentum $\mathbf{J}$, modulating the GW emission similar to pulsar emission resulting from a misaligned jet rotating in and out of the line of sight. We investigate the ability of a single L-shaped GW detector to distinguish between these two sources of modulation. We find that precessional modulation can mimic the lensing modulation between two images with comparable magnifications when the time delay between the images is short enough that fewer than three interference fringes occur during the time the GW signal spends in the sensitivity band of the detector. As strong lensing is rare for GW sources at moderate redshift while misaligned spins are common for BBHs produced in certain formation channels, ruling out precessional modulation is essential to identifying genuinely lensed systems.
发表机构
- The University of Texas at Dallas（德克萨斯大学达拉斯分校）
- Cornell University（康奈尔大学）
- Johns Hopkins University（约翰斯·霍普金斯大学）
- Southwestern University（西南大学）
机构由 AI 辅助整理，请以论文原文为准。
