标题： 追逐轨道，而非时间：一种用于长期偏心引力波代理模型的可扩展范式 显示英文标题

标题： Chase Orbits, not Time: A Scalable Paradigm for Long-Duration Eccentric Gravitational-Wave Surrogates

摘要： 非圆形双黑洞波形的代理建模仍然具有挑战性。 由于轨道偏心率时间尺度变化导致这些波形的形态复杂，使得构建准确且高效的代理模型变得困难，尤其是对于足够长的波形，以覆盖当前地面引力波探测器的敏感频段。 我们提出了一种新颖且可扩展的代理构建技术，使长期持续的非圆形双黑洞波形的代理建模既可行又高效。 该技术旨在通过将中间偏心代理数据片段建模为一个称为平均近点角的角轨道元素，而不是时间，从而简化其谐波内容。 我们表明，这种新参数化方法相比使用时间的当代参数化方法，能减少一个数量级的代理基函数。 我们表明，当用瞬时波形偏心率和平均近点角表示时，代理数据片段在参数空间中的变化变得更加规律，大大简化了它们的参数空间拟合。 本文提出的这些方法使得为当前以及未来第三代引力波探测器构建长期持续的偏心代理模型成为可能。 显示英文摘要

摘要： Surrogate modeling of eccentric binary black hole waveforms has remained challenging. The complicated morphology of these waveforms due to the eccentric orbital timescale variations makes it difficult to construct accurate and efficient surrogate models, especially for waveforms long enough to cover the sensitivity band of the current ground-based gravitational wave detectors. We present a novel and scalable surrogate building technique which makes surrogate modeling of long-duration eccentric binary black hole waveforms both feasible and highly efficient. The technique aims to simplify the harmonic content of the intermediate eccentric surrogate data pieces by modeling them in terms of an angular orbital element called the mean anomaly, instead of time. We show that this novel parameterization yields an order of magnitude fewer surrogate basis functions than using the contemporary parameterization in terms of time. We show that variations in surrogate data-pieces across parameter space become much more regular when expressed in terms of the instantaneous waveform eccentricity and mean anomaly, greatly easing their parameter-space fitting. The methods presented in this work make it feasible to build long-duration eccentric surrogates for the current as well as future third-generation gravitational wave detectors.