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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 noise.Addressing 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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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 roadmap.Taiji-1 was launched on 31 August 2019 and its designed mission was successfully completed.The in-orbit scientific achievements of Taiji-1 satellite in the first stage have been published and now it has entered the extended task phase.Taiji-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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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 detection.With 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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基于CiteSpace的中国“设计下乡”发展热点主题与趋势研究

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湖南包装 2024年第3期39卷 134-136,151页

作者：吴月亮谢兰俊湖南科技大学建筑与艺术设计学院湖南湘潭411201

“设计下乡”是中国乡村振兴战略中的一项重要部署,也是加强中国乡情调查、解决长期以来乡村研究薄弱、乡村规划覆盖率低等问题的重要手段之一。文章基于CNIK数据库分析了乡村振兴背景下的“设计下乡”文献数据,通过数据可视化技术(Cite... 详细信息

“设计下乡”是中国乡村振兴战略中的一项重要部署,也是加强中国乡情调查、解决长期以来乡村研究薄弱、乡村规划覆盖率低等问题的重要手段之一。文章基于CNIK数据库分析了乡村振兴背景下的“设计下乡”文献数据,通过数据可视化技术(Cite Space),将“设计下乡”的文献数据转换成图形可视化,从而为其提供一种新的观察方式方法。利用数据去充分了解“设计下乡”的研究趋势和主题,并且通过对一定的数据记录进行分析,既可以预测未来设计的作用和影响,也可以在宏观角度下分析“设计下乡”的核心价值,让设计师能快速掌握“设计下乡”的信息,从而提高“设计下乡”的针对性、精确性、效率性,为目前行业内的其他研究者们提供参考。

关键词： “设计下乡” 数据可视化乡村振兴 CNIK数据库

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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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不同光质补光对辣椒生长发育及果实品质的影响

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中国蔬菜 2024年第4期 74-84页

作者：吴月亮肖检妹崔苏菲胡博文王军伟熊程湖南农业大学园艺学院园艺作物种质创新与新品种选育教育部工程研究中心蔬菜生物学湖南省重点实验室农业农村部园艺作物(蔬菜、茶叶等)基因资源评价利用重点实验室湖南长沙410125

以樟树港辣椒为试材,采用塑料大棚栽培,研究了在夜间分段(19:00—22:00,3:00—6:00)进行不同光质〔NIR(近红外光)、R(红光)、G(绿光)、UV-A(长波紫外光)、B(蓝光)、红蓝组合光(3R2B、2R3B)、W(白光)〕顶部补光处理对辣椒生长发育及果实... 详细信息

以樟树港辣椒为试材,采用塑料大棚栽培,研究了在夜间分段(19:00—22:00,3:00—6:00)进行不同光质〔NIR(近红外光)、R(红光)、G(绿光)、UV-A(长波紫外光)、B(蓝光)、红蓝组合光(3R2B、2R3B)、W(白光)〕顶部补光处理对辣椒生长发育及果实品质的影响。结果表明:与不补光对照相比,蓝光(B)处理对果实品质提升效果最佳,果实中的辣椒素、抗坏血酸、类黄酮和类胡萝卜素含量均显著提高,分别较对照增加了12.35%、46.64%、37.52%和18.44%。同时,B处理辣椒单株产量也显著提升,较对照提高20.64%。Pearson分析显示,果实干质量是最能代表辣椒生长发育和果实品质优劣的指标。聚类分析和主成分分析显示,B和红蓝组合光(2R3B、3R2B)是调节效果优的光质;G、紫外光(10U、20U)和NIR是调节效果差的光质。采用隶属函数法进行综合评价,B处理下辣椒的平均隶属函数值最高,是设施栽培中改善辣椒生长发育及果实品质的最佳光环境调控光质。

关键词：辣椒 LED 光质补光生长品质

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Topology change and emergent scale symmetry in compact star matter via gravitational wave detection

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Science China(Physics,Mechanics & Astronomy) 2021年第5期64卷 28-33页

作者： WenCong Yang YongLiang Ma yueliang wu Center for Theoretical Physics and College of Physics Jilin University Changechun 130012China School of Fundamental Physics and Mathematical Sciences Hangzhou Instiute for Advanced StudyUniversity ofChinese Academy of SciencesHangzhou 310024China International Center for Theoretical Physics Asia Pacific(ICTP-AP)(Beiing/Hangzhou) University of Chinese Academy of SciencesBejing 100190China Institute of Theoretical Physiecs Chinese Academy of SciencesBeijing 100190China Schoo of Physical Sciences.University of Chinese Academy of Sciences Beijing 100049China

Topological structure has been extensively studied and confirmed in highly correlated condensed matter physics. We explore the gravitational waves emitted from binary neutron star mergers using the pseudoconformal model for dense nuclear matter for compact stars. This model considers the topology change and the possible emergent scale symmetry and satisfies all the constraints from astrophysics. We find that the location of the topology change affects gravitational waves dramatically owing to its effect on the equation of state. In addition, the effect of this location on the waveforms of the gravitational waves is within the ability of the on-going and up-coming facilities for detecting gravitational waves, thus suggesting a possible way to measure the topology structure in nuclear physics.

关键词： topology change emergent symmetry compact star matter gravitational wave

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Stability of proton and maximally symmetric minimal unification model for basic forces and building blocks of matter

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Science China(Physics,Mechanics & Astronomy) 2007年第3期50卷 303-310页

作者： wu yueliang Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China Institute of Theoretical Physics Chinese Academy of Sciences Beijing China

With the hypothesis that all independent degrees of freedom of basic building blocks should be treated equally on the same footing and correlated by a possible maximal symmetry, we arrive at a 4-dimensional space-time unification model. In this model the basic building blocks are Majorana fermions in the spinor repre- sentation of 14-dimensional quantum space-time with a gauge symmetry GM4D = SO(1,3)×SU(32)×U(1)A×SU(3)F. The model leads to new physics including mirror particles of the standard model. It enables us to issue some fundamental questions that include: why our living space-time is 4-dimensional, why parity is not con- served in our world, how the stability of proton is, what the origin of CP violation is and what the dark matter can be.

关键词： gauge symmetry space-time symmetries beyond standard model and unification

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Editorial

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Science China(Physics,Mechanics & Astronomy) 2018年第10期61卷 1-1页

作者： yueliang wu RongGen Cai YuFeng Zhout University of Chinese Academy of Sciences Beijing 100049 China Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

The paradigm that our universe is dominated by non-luminous matter,i.e.,dark matter,rather than ordinary baryonic matter,has been established since the 1980s.However,the nature of dark matter remains almost unknown.Many ongoing space experiments are aiming at uncovering the particle nature of dark matter via precise measurements of the flux of cosmic-ray particles,with a hope to find fingerprints that tiny annihilations or decays of dark matter may have left.Such

关键词：编辑粒子性质空间实验暗物质关键部件宇宙播放器热量计

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CP VIOLATION IN THE STANDARD MODEL WITH FOUR GENERATIONS

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Chinese Physics Letters 1987年第10期4卷 441-444页

作者：吴丹迪 CERN-Geneva 吴岳良 Institute of High Energy Physics Academia SinicaBeijing Institute of Theoretical Physics Academia SinicaBeijing

CP violation in the standard model with four generations of quarks in examined using rephasing invariants of the mixing matrix.A condition for CP invariance is presented and proved.CP violations in different sections ... 详细信息

关键词： conditions matrix invariants

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