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

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

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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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激光干涉引力波空间阵列核心问题的综合讨论

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科学通报 2019年第24期64卷 2468-2474页

作者：罗子人张敏靳刚中国科学院力学研究所北京100190 中国科学院大学工程科学学院北京100049

空间激光干涉引力波探测计划,例如欧洲航天局主导和美国参加的LISA(Laser Interferometer Space Antenna)计划[1]、中国的“太极”计划[2]和“天琴”计划[3]等,瞄准中低频段(0.1mHz^lHz)的引力波波源.这个频段的引力波事件被认为具有更... 详细信息

空间激光干涉引力波探测计划,例如欧洲航天局主导和美国参加的LISA(Laser Interferometer Space Antenna)计划[1]、中国的“太极”计划[2]和“天琴”计划[3]等,瞄准中低频段(0.1mHz^lHz)的引力波波源.这个频段的引力波事件被认为具有更重要的天文学、宇宙学以及物理学意义[4-6],其典型的波源包括超大(和中等)质量黑洞双星的并合、极端(和中等)质量比黑洞双星的绕转、银河系内数以百万计的致密双星系统以及随机引力波背景等.

关键词：激光干涉引力波空间双星系统欧洲航天局探测计划低频段质量比

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Research on Telescope TTL Coupling Noise in Intersatellite Laser Interferometry

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Photonic Sensors 2020年第3期10卷 265-274页

作者： Zhi WANG Tao YU Ya ZHAO ziren luo Wei SHA Chao FANG Yukun WANG Shaoxin WANG Keqi QI Yongxian WANG Xuanwen XU Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences Beijing 100049China Institute of Mechanics Chinese Academy of SciencesBeijing 100190China Jilin University Changchun 130022China

The detection mission of gravitational waves in space is that the accuracy of the long-baseline intersatellite laser interferometry on the million-kilometer order needs to reach the order of 8 pm/*** all noise sources that affect the interferometry accuracy,tilt-to-length(TTL)coupling noise is the second largest source of noise after shot *** paper focuses on studying the contribution of TTL coupling noise of the telescope system in the intersatellite scientific *** referring to the laser interferometer space antenna(LISA)’s noise budget,TTL coupling noise is required to be within±25μm/rad(±300μrad).Therefore,this paper focuses on studying both the mechanism of TTL coupling noise due to the noise sources of the telescope and the method of suppressing the TTL noise,which can lay a foundation for noise distribution and the development of engineering prototypes in subsequent tasks.

关键词： Intersatellite laser interferometry telescope TTL coupling noise

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A preliminary study of level 1A data processing of a low-low satellite to satellite tracking mission

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Geodesy and Geodynamics 2015年第5期6卷 333-343页

作者： Xu Peng Qiang Li'e Bian Xing Dong Peng Ju Peng Gao Wei Gong Xuefei luo ziren Shao Mingxue Tang Werilin Wan Xiaoyun Lau Yun-Kau Institute of Applied Mathematics Academy of Mathematics and Systems ScienceChinese Academy of Sciences Morningside Center of Mathematics Chinese Academy of Sciences State Key Laboratory of Geodesy and Earth's Dynamics Institute of Geodesy and Geo-physicsChinese Academy of Sciences Department of Geophysics College o/the Geology Engineering and GeomaticsChang 'an University University of Chinese Academy of Sciences Max-Planck-Institute for Grauitational Physics(Albert Einstein Institute) Aerospace Flight Dynamics Laboratory Beijing Aerospace Control Center Qian Xuesen Laboratory of Launch Vehicle Technology State Key Laboratory of Scientific and Engineering Computing Academy of Mathematics and Systems ScienceChinese Academy of Sciences

With the Gravity Recovery and Climate Experiment {GRACE） mission as the prime example, an overview is given on the management and processing of Level IA data of a low-low satellite to satellite tracking mission. To illustrate the underlying principle and algorithm, a detailed study is made on the K-band ranging （KBR） assembly, which includes the measurement principles, modeling of noises, the generation of Level 1A data from that of Level 0 as well as Level IA to Level IB data processing.

关键词： Data processingDual-one-way ranging (DOWR)Gravity recovery and climateexperiment (GRACE)K-band ranging (KBR)Satellite to satellite tracking (SST)Noise analysisSatellite gravityUltra stable oscillator (USO)

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