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Advancing space-based gravitational wave astronomy: Rapid parameter estimation via normalizing flows

Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 20-33页

作者： Minghui Du Bo Liang He Wang Peng Xu ziren luo Yueliang Wu Center for Gravitational Wave Experiment National Microgravity LaboratoryInstitute of MechanicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of SciencesBeijing 100049China Taiji Laboratory for Gravitational Wave Universe(Beijing/Hangzhou) University of Chinese Academy of SciencesBeijing 100049China Lanzhou Center of Theoretical Physics Lanzhou UniversityLanzhou 730000China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China

Gravitational wave(GW) astronomy is witnessing a transformative shift from terrestrial to space-based detection, with missions like Taiji at the forefront. While the transition brings unprecedented opportunities for exploring massive black hole binaries(MBHBs), it also imposes complex challenges in data analysis, particularly in parameter estimation amidst confusion *** this gap, we utilize scalable normalizing flow models to achieve rapid and accurate inference within the Taiji environment. Innovatively, our approach simplifies the data's complexity, employs a transformation mapping to overcome the year-period time-dependent response function, and unveils additional multimodality in the arrival time parameter. Our method estimates MBHBs several orders of magnitude faster than conventional techniques, maintaining high accuracy even in complex backgrounds. These findings significantly enhance the efficiency of GW data analysis, paving the way for rapid detection and alerting systems and enriching our ability to explore the universe through space-based GW observation.

关键词： Taiji program gravitational wave detection parameter estimation machine learning

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Progress of Taiji-2 Project

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空间科学学报 2024年第4期44卷 674-676页

作者： luo ziren ZHANG Min WANG Jianyu WU Yueliang Taiji Laboratory for Gravitational Universe University of Chinese Academy of SciencesBeijing 100049 Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024 Institute of Mechanics Chinese Academy of SciencesBeijing 100190 International Center for Theoretical Physics Asia-Pacific University of Chinese Academy of SciencesBeijing 100190 Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083

Taiji-2 project is the second step of Taiji program,which is to verify the required technology for Taiji-3 *** feasibility study of Taiji-2 is successfully finished,and some of the main progress is introduced here.

关键词： Gravitational wave Taiji program Taiji-2 project

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Exploring the nature of black hole and gravity with an imminent merging binary of supermassive black holes

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Science China(Physics,Mechanics & Astronomy) 2023年第3期66卷 76-87页

作者： Xingyu Zhong Wen-Biao Han ziren luo Yueliang Wu Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Taiji Laboratory for Gravitational Wave Universe(Beijing/Hangzhou) University of Chinese Academy of SciencesBeijing 100049China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310124China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China Shanghai Frontiers Science Center for Gravitational Wave Detection Shanghai 200240China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China International Centre for Theoretical Physics Asia-Paciﬁc University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Hangzhou 310124China

A supermassive binary black-hole candidate SDSS J1430+2303 reported recently motivates us to investigate an imminent binary of supermassive black holes as potential gravitational wave source, and the radiated gravitational waves at the end of the merger are shown to be in the band of space-borne detectors. We provide a general analysis on the required detecting sensitivity needed for probing such type gravitational wave sources and make a full discussion by considering two typically designed configurations of space-borne antennas. If a source is so close, it is possible to be detected with Taiji pathfinder-plus which is proposed to be an extension for the planned Taiji pathfinder by just adding an additional satellite to the initial two satellites. The gravitational wave detection on such kind of source enables us to explore the properties of supermassive black holes and the nature of gravity.

关键词： gravitation wave SMBHBs Taiji pathfinder

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Taiji-1 Satellite Mission

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空间科学学报 2020年第5期40卷 691-692页

作者： luo ziren ZHANG Min WU Yueliang Taiji Laboratory for Gravitational Universe University of Chinese Academy of ScienceBeijing 100049 Institute of Mechanics Chinese Academy of ScienceBeijing 100190 International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of ScienceBeijing 100190

China’s first satellite to conduct experiments on key technologies related to space-based gravitational wave detection,Taiji-1,has successfully completed its in-orbit tests,making a breakthrough in the country’s gravitational wave *** the success of Taiji-1’s in-orbit tests,the first goal of Chinese Academy of Science’s three-step strategy to implement the Taiji program has been successfully achieved.

关键词： Gravitational wave Taiji program Drag-free control system

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Recent Status of Taiji Program in China

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空间科学学报 2022年第4期42卷 536-538页

作者： luo ziren ZHANG Min WU Yueliang Taiji Laboratory for Gravitational Universe University of Chinese Academy of SciencesBeijing 100049 Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024 Institute of Mechanics Chinese Academy of SciencesBeijing 100190 International Center for Theoretical Physics Asia-Pacific UCASBeijing100190

The Taiji-1 satellite is a pilot satellite mission of Taiji program,which is used to verify Taiji’s key technology and also to testify the feasibility of Taiji ***-1 was launched on 31 August 2019 and its designed mission was successfully *** in-orbit scientific achievements of Taiji-1 satellite in the first stage have been published and now it has entered the extended task ***-2 will prepare all the technology needed by Taiji-3,and remove all the technical obstacles faced by Taiji-3.

关键词： Gravitational wave Taiji program Global gravity field model

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A comprehensive simulation of weak-light phase-locking for space-borne gravitational wave antenna

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Science China(Technological Sciences) 2016年第5期59卷 730-737页

作者： DONG YuHui LIU HeShan luo ziren LI YuQiong JIN Gang National Microgravity Laboratory (NML) Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100190 China QUEST Centre of Quantum Engineering and Space-Time Research Leibniz Universitat Hannover Hannover 30167 Germany Max-Planck-Institude for Gravitational Physics (Albert Einstein Institute) Hannover 30167 Germany

A comprehensive simulation was performed to better understand the impacts and effects of the additional technical noises on weak-light phase-locking for LISA. The result showed that the phase of the slave laser tracked well with the received transmitting light under different noise level, and the locking precision was limited by the phase readout noise when the laser frequency noise and clock jitter noise were removed. This result was then confirmed by a benchtop experimental test. The required LISA noise floor was recovered from the simulation which proved the validity of the simulation program. In order to convert the noise function into real time data with random characteristics, an algorism based on Fourier transform was also invented.

关键词： weak-light phase-locking gravitational wave detection heterodyne laser interferometer

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Principle demonstration of fine pointing control system for inter-satellite laser communication

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Science China(Technological Sciences) 2015年第3期58卷 449-453页

作者： DONG YuHui LIU HeShan luo ziren LI YuQiong JIN Gang National Microgravity Laboratory (NML) Institute of Mechanics Chinese Academy of Sciences University of Chinese Academy of Sciences

Due to high data rates and reliability,inter-satellite laser communication has developed rapidly in these ***,the stability of the laser beam pointing is still a key technique which needs to be solved;otherwise,the beam pointing jitter noise would reduce the communication quality or,even worse,would make the inter-satellite laser communication *** this purpose,a bench-top of the fine beam pointing control system has been built and tested for inter-satellite laser *** pointing offset of more than 100rad is produced by the steering *** beam pointing control system turned on,the offset could be rapidly suppressed to lower than 100 nrad in less than 0.5 ***,the pointing stability can be kept at 40 nrad for yaw motion and 62 nrad for pitch motion,when the received beam jitter is set at 20rad.

关键词： laser beam pointing control inter-satellite laser communication heterodyne laser interferometer differential wave-front sensing(DWS) technique

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空间引力波探测惯性传感器及其关键技术

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中国科学：物理学、力学、天文学 2024年第7期54卷 87-104页

作者：王少鑫郭纬川赵平安王娟董鹏徐鹏罗子人齐克奇中国科学院力学研究所国家微重力实验室引力波实验中心北京100190 国科大杭州高等研究院物理与光电工程学院杭州310024 国科大杭州高等研究院基础物理与数学科学学院杭州310024

空间引力波探测任务测量频段为0.1 m Hz-1 Hz,该频段内的波源信息非常丰富.但受限于引力波微弱的信号强度,需要惯性基准——测试质量的残余加速度噪声水平低于10^(-15)m s^(-2)/Hz^(1/2).惯性传感器作为空间引力波探测核心的载荷之一,... 详细信息

空间引力波探测任务测量频段为0.1 m Hz-1 Hz,该频段内的波源信息非常丰富.但受限于引力波微弱的信号强度,需要惯性基准——测试质量的残余加速度噪声水平低于10^(-15)m s^(-2)/Hz^(1/2).惯性传感器作为空间引力波探测核心的载荷之一,一方面通过一系列的功能设置和灵巧设计来屏蔽外界杂散力对测试质量的影响,另一方面与微推进器构成无拖曳控制系统,利用电容位移传感器的高精度测量以及多自由度驱动控制来维持测试质量在空间中的高精度free-fall运动,从而为激光干涉测量提供超稳惯性基准.为了满足测试质量苛刻的加速度噪声要求惯性传感器在构建过程中,会涉及多种具有不同功能的子系统和关键技术.本文从空间引力波探测背景出发,介绍空间惯性传感器的基本工作原理和设计约束,进而对惯性传感器的相关关键技术进行探讨,并在最后对惯性传感器的应用和研究进行展望.

关键词：空间引力波探测惯性传感器电容传感和静电力驱动控制电荷管理锁紧释放

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面向空间引力波探测的激光干涉技术研究进展及展望

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中国科学：物理学、力学、天文学 2024年第7期54卷 105-123页

作者：王娟齐克奇王少鑫高瑞弘李磐杨然刘河山罗子人中国科学院力学研究所国家微重力实验室北京100190 国科大杭州高等研究院基础物理与数学科学学院杭州310024

随着地面引力波的成功探测,面向更低频段、更广目标波源、反映更多天体物理现象的空间引力波探测越来越受到各国研究团队的共同关注.为了明确探测计划现阶段的发展水平以及限制因素,为下一步干涉仪测量水平的提高做准备,本文围绕激光干... 详细信息

随着地面引力波的成功探测,面向更低频段、更广目标波源、反映更多天体物理现象的空间引力波探测越来越受到各国研究团队的共同关注.为了明确探测计划现阶段的发展水平以及限制因素,为下一步干涉仪测量水平的提高做准备,本文围绕激光干涉测量技术,一方面对空间引力波探测的原理、国内外典型探测项目的在轨探测结果进行了回顾;另一方面展示了干涉测量系统的整体布局,介绍了主要噪声源的影响机制和抑制方法.

关键词：空间引力波探测激光干涉测量技术干涉仪噪声分析

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基于MBSE的空间引力波探测系统指标管理及其探测灵敏度分析

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图学学报 2024年第2期45卷 259-267页

作者：朱伊明张玉珠陈斌彭晓东高辰刘宇唐文林强丽娥徐鹏罗子人中国科学院国家空间科学中心北京100190 中国科学院大学计算机学院北京100049 中国科学院力学研究所北京100190 国科大杭州高等研究院浙江杭州310024

为了将空间引力波探测系统论证过程中顶层指标分解与系统级性能分析过程动态关联,提供对空间科学任务全生命周期信息的管理与应用分析能力,提出了基于模型的系统工程(MBSE)的空间引力波探测系统指标管理及其探测灵敏度分析方法。通过系... 详细信息

为了将空间引力波探测系统论证过程中顶层指标分解与系统级性能分析过程动态关联,提供对空间科学任务全生命周期信息的管理与应用分析能力,提出了基于模型的系统工程(MBSE)的空间引力波探测系统指标管理及其探测灵敏度分析方法。通过系统建模语言(SysML)构建空间引力波探测系统指标参数模型,并解析模型内容,筛选和记录指标参数,最后,通过探测灵敏度这一评价空间引力波探测系统探测能力的主要标准,实现空间引力波探测系统对不同科学目标的探测性能分析。结果表明,该方法可统一管理和追溯所有指标内容,为空间引力波探测系统顶层指标论证和系统级性能评价提供了支持。

关键词： MBSE SysML 模型解析引力波探测灵敏度

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