Secondary accretion of dark matter in intermediate mass-ratio inspirals: Dark-matter dynamics and gravitational-wave phase
Secondary accretion of dark matter in intermediate mass-ratio inspirals: Dark-matter dynamics and gravitational-wave phase
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DOI：
10.1103/physrevd.108.124062
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发表时间：
2023-09
影响因子：
5
通讯作者：
David A. Nichols;Benjamin A. Wade;Alexander M. Grant
中科院分区：
文献类型：
--
作者：
David A. Nichols;Benjamin A. Wade;Alexander M. Grant
当粒子暗物质在足够高的密度下被引力束缚在一个大质量黑洞周围时，暗物质将影响与大质量黑洞形成双星的次要致密天体的吸引率。在这篇文章中，我们回顾了以前对黑洞次级暗物质吸积对发出的引力波的影响的估计。我们确定了双星参数空间中对吸积量的估计过大的区域(具体地说，因为假定暗物质分布在整个过程中不变，并且次级黑洞在暗物质中吸积的质量比次级黑洞轨道内的暗物质质量多)。为了在这些场景中恢复一致性，我们提出并实现了一种方法，当暗物质粒子被次级粒子吸积时，从分布函数中移除它们。然后，这种新的反馈过程满足质量守恒，当用物理上合理的初始数据进化时，第二颗行星所增加的质量不再超过其轨道半径内的质量。比较有吸积反馈的模拟和没有这种反馈的模拟，包括反馈的模拟导致了较小的引力波从双星中消相，其中只对动力摩擦的影响进行了模拟。然而，退相可以是数百到近千个引力波周期，这个数量应该可以从这些系统的引力波测量中推断出吸积的影响。
When particle dark matter is bound gravitationally around a massive black hole in sufficiently high densities, the dark matter will affect the rate of inspiral of a secondary compact object that forms a binary with the massive black hole. In this paper, we revisit previous estimates of the impact of dark-matter accretion by black-hole secondaries on the emitted gravitational waves. We identify a region of parameter space of binaries for which estimates of the accretion were too large (specifically, because the dark-matter distribution was assumed to be unchanging throughout the process, and the secondary black hole accreted more mass in dark matter than that enclosed within the orbit of the secondary). To restore consistency in these scenarios, we propose and implement a method to remove dark-matter particles from the distribution function when they are accreted by the secondary. This new feedback procedure then satisfies mass conservation, and when evolved with physically reasonable initial data, the mass accreted by the secondary no longer exceeds the mass enclosed within its orbital radius. Comparing the simulations with accretion feedback to those without this feedback, including feedback leads to a smaller gravitational-wave dephasing from binaries in which only the effects of dynamical friction are being modeled. Nevertheless, the dephasing can be hundreds to almost a thousand gravitational-wave cycles, an amount that should allow the effects of accretion to be inferred from gravitational-wave measurements of these systems.