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arXiv 2006.11263gr-qcastro-ph.HE
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极质量比吸气的两时标演化:Schwarzschild时空中准圆轨道的波形产生方案

Two-timescale evolution of extreme-mass-ratio inspirals: waveform generation scheme for quasicircular orbits in Schwarzschild spacetime

Jeremy Miller, Adam Pound

摘要:

极端质量比的螺旋,即一个恒星质量的致密物体螺旋进入星系核心的超大质量黑洞,预计是LISA的关键来源。要为LISA科学建立足够精确的模型,需要在引力自作用力理论中达到二阶(或{ \em后绝热})。在这里,我们提出了一个实用的两个时间尺度的框架,实现这一点,并产生后绝热波形。该框架包括一组频域场方程,适用于快速,轨道的时间尺度,以及一组常微分方程,确定的演变缓慢,inspiral的时间尺度。我们的分析仅限于史瓦西黑洞周围的准圆轨道的特殊情况,但它的一般结构延续到克尔时空中的一般(倾斜和偏心)轨道的现实情况。在我们的限制范围内,我们还开发了一种工具,将在所有情况下是有用的:使用双曲面切片,显着提高了边界附近的源的行为的频域场方程的配方。我们特别注意的缓慢演变的中央黑洞,研究其影响的两个时间尺度的演变和早期的自洽的演变计划。

英文摘要:

Extreme-mass-ratio inspirals, in which a stellar-mass compact object spirals into a supermassive black hole in a galactic core, are expected to be key sources for LISA. Modelling these systems with sufficient accuracy for LISA science requires going to second (or {\em post-adiabatic}) order in gravitational self-force theory. Here we present a practical two-timescale framework for achieving this and generating post-adiabatic waveforms. The framework comprises a set of frequency-domain field equations that apply on the fast, orbital timescale, together with a set of ordinary differential equations that determine the evolution on the slow, inspiral timescale. Our analysis is restricted to the special case of quasicircular orbits around a Schwarzschild black hole, but its general structure carries over to the realistic case of generic (inclined and eccentric) orbits in Kerr spacetime. In our restricted context, we also develop a tool that will be useful in all cases: a formulation of the frequency-domain field equations using hyperboloidal slicing, which significantly improves the behavior of the sources near the boundaries. We give special attention to the slow evolution of the central black hole, examining its impact on both the two-timescale evolution and the earlier self-consistent evolution scheme.

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