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ICTP-AP Summer School 2022 Draws to a Close
ICTP-AP Summer School 2022 Draws to a Close
by admin - Jul 12, 2022

The five-day long summer school jointly held by International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) and Taiji Laboratory for Gravitational Wave Universe was successfully concluded on 8th July, 2022. During the week, students from over 30 universities and science institutes gathered virtually to explore the myth of basic physics and enjoy the beauty of science, with 20 lectures centered on gravity, black hole and quanta to cosmos, gravitational wave detection and accurate measurement given by eleven experts and professors.  Group photo of the students and staffThis virtual summer school has provided an important platform for the young talents to reach the frontiers of international disciplines so as to attract more youth to devote themselves to the research field of gravitational wave detection, become a member of the Taiji Program in Space and make their own contribution to Chinese space gravitational wave detection mission in the future.

IYBSSD 2022 Officially Launched in China
IYBSSD 2022 Officially Launched in China
by admin - Jul 1, 2022

On 30 June 2022, the launching ceremony of the “Forum on Frontiers of Quanta to Cosmos Physics” was held successfully. The International Centre for Theoretical Physics Asia-Pacific (UNESCO Category 2 Centre), Institute of Theoretical Physics, CAS, and Hangzhou Institute for Advanced Study, UCAS jointly organized this forum, marking the official launch of the "2022 International Year of Basic Sciences for Sustainable Development" in China. Five online platforms broadcasted this event and attracted more than 50,000 participations.At the beginning of the forum, six leaders from the Chinese Academy of Sciences, National Natural Science Foundation of China, and research institutions actively expressed their support for IYBSSD 2022 and the “Forum on Frontiers of Quanta to Cosmos Physics". Then, six academicians delivered academic reports on the development history, current situation, and frontier prospects of theoretical physics.  As one of the IYBSSD 2022 events in China, the Forum on Frontiers of Quanta to Cosmos Physics mainly focuses on the significance of basic science to original innovation, scientific and technological development, and sustainable development. From 30 June to 31 December 2022, the forum will hold separate forums corresponding to different topics including: Particle Physics and Origin of Matter, Unified Field Theory and Origin of Universe, Dark Universe and Black Hole Physics, Nuclear and Plasma Physics, Gravitational Waves and Precision Measurement Physics, and Fundamental Physics and Quantum Century.The sub-forum will invite scientists working on the front line of scientific research to share their experiences and insights of basic sciences research, to enhance the public's understanding of basic science and stimulate young people's interest in participating in basic science research.The Forum on Frontiers of Quanta to Cosmos Physics is supported by the Chinese Academy of Sciences and National Natural Science Foundation of China.

Hyperunified Field Theory Opens Up A New Way to Reveal the Essence of Spacetime and Gravity and the Origin of Matter and Universe
Hyperunified Field Theory Opens Up A New Way to Reveal the Essence of Spacetime and Gravity and the Origin of Matter and Universe
by admin - Dec 20, 2021

At present, human beings know that there are four fundamental interactions in nature: gravitation, electromagnetism, strong and weak interactions. Gravitation is described by Einstein’s general theory of relativity, electromagnetic interactions are described by Maxwell equations, strong interactions are described by quantum chromodynamics (the binding of protons and neutrons into nuclei exhibits strong interactions), and weak interactions are described by electroweak model (some radioactive decays of unstable elements are caused by weak interactions, such as ß-decay). One of the ultimate goals of theoretical physics is to find a theoretical framework that can describe the four fundamental interactions in a unified way, i.e., the unified theory.Why should we unify different theories? In the development history of theoretical physics, unified theories describing different physical phenomena appeared more than once, and each unification made human beings have a deeper understanding of nature. For example, it is intuitively believed that electricity and magnetism are different natural phenomena, but Maxwell advanced a set of equations, which can describe electricity and magnetism in a unified way, indicating that electricity and magnetism are essentially the same, that is, electricity can generate magnetism, and magnetism can generate electricity, which laid a foundation for the development of motors, generators and radio communication. Current research in theoretical physics shows that the electroweak and strong interactions can be described by the Standard Model of particle physics, but they are still relatively independent and have not formed a unified model. In addition, gravitational interaction is essentially different from other interactions. The general theory of relativity describing gravitation is still a classical theory described by spacetime geometric dynamics, not a quantum theory. Therefore, it has always been the goal of theoretical physicists to find the quantum theory of gravitation and unify the electroweak interaction, strong interaction and gravitational interaction. In the search for a unified theory, Einstein made many attempts in the rest of his life, but failed. In recent decades, theoretical physicists put forward and developed the superstring theory, which is considered as a possible candidate for the unified theory. However, there is no final conclusion on this issue. One hundred years after Einstein put forward the Unified Field Theory, Yueliang Wu, academician of Chinese Academy of Sciences (Director of ICTP-AP, Director of Taiji Laboratory for Gravitational Wave Universe of UCAS, and Director of Academic Committee of the Institute of Theoretical Physics, CAS) has completed the systematic research work of The Foundation of the Hyperunified Field Theory. It opens up a new way to reveal the basic composition, symmetry and basic interactions of nature, the essence of spacetime and gravitation, and the origin of matter and the universe. It is a new attempt to the unified theory. The exploration and research of The Foundation of the Hyperunified Field Theory breaks the usual thinking formed since Einstein’s theory of relativity. Instead of starting directly from the existing concepts of symmetry, spacetime and its geometry, it takes the concepts of matter and motion as the basic starting point, that is, nature is composed of fundamental building blocks, which have intrinsic structures and are in motion constantly, and their motion is simple and regular. In order to realize such concepts of matter and motion reasonably and consistently in physics, The Foundation of the Hyperunified Field Theory takes the action principle of path integral formulation, which has been successfully applied to quantum field theory and classical physics, as its theoretical form system, the maximum coherence motion principle and locally entangled-qubits motion principle, together with the principle of scaling and gauge invariance are proposed and served as the foundation of hyperunified field theory. Starting from the basic matter field and motion concept and based on the existing physical phenomena and experiments, The Foundation of the Hyperunified Field Theory puts forward the basic guiding principles for establishing hyperunified field theory. Through detailed physical analysis and systematic theoretical deduction and induction, it can solve a series of long-standing basic problems in fundamental theoretical physics. For example, why are the fundamental building blocks of nature presented as spinor fields? What is the fundamental symmetry of nature and how it came into being? What is the basic attribute of spacetime and how it is embodied? How to determine the spacetime dimension of nature? Why time is different from space, and time is one-dimensional? Why there are more than one generation of leptons and quarks in nature? Why is the material world observed a four-dimensional spacetime universe? Whether the four basic interactions known in nature can be dominated by unified fundamental symmetry? What is the essence of gravitation and how it is characterized by hyperunified fundamental symmetry? What is the essence and structure of spacetime? How to understand the origin and evolution of the universe and how the early inflation of the universe occurred? What are the properties of dark matter and whether its existence implies new interactions in nature? What is the essence of dark energy and whether its presentation comes from new interactions in nature? Why today’s universe presents parity breaking and asymmetry between matter and antimatter? Whether the unified description of the fundamental laws of physics is uniquely determined by the concepts of matter and motion, and what kind of energy concepts, spacetime concepts, geometric concepts and cosmic concepts it will lead to? Academician Yueliang Wu’s related research results have been written into two articles, The foundation of the Hyperunified Field Theory I-Fundamental Building Block and Symmetry and The foundation of the Hyperunified Field Theory II-Fundamental Interaction and Evolving Universe, which were published in the International Journal of Modern Physics A (IJMPA Vol.36, No.28) with the special issue The foundation of the Hyperunified Field Theory (301 pages in total):“Special Issue on the Foundation of the Hyperunified Field Theory”  https://www.worldscientific.com/toc/ijmpa/36/28 “The Foundation of the Hyperunified Field Theory I —Fundamental   Building Block and Symmetry”( IJMPA Vol.36, No.28, 2143001 (2021); arXiv:2104.05404 )  https://www.worldscientific.com/doi/abs/10.1142/S0217751X21430016 “The Foundation of the Hyperunified Field Theory II —Fundamental Interaction and Evolving Universe” ”( IJMPA Vol.36, No.28, 2143002 (2021); arXiv:2104.05404 )    https://www.worldscientific.com/doi/abs/10.1142/S0217751X21430028 He was invited to give talks on related work at the 2020/2021 Autumn Conference of Chinese Physical Society and the 28th International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY2021):The Foundation of Hyperunified Field Theory & Opportunity of New Scientific Revolution https://www.koushare.com/video/videodetail/16871  The Foundation of Unified Theory & Space Gravitational Wave Detection https://indico.cern.ch/event/875077/contributions/4488999/ The research above is supported by national funds, including the national key research and development plan of the Ministry of Science and Technology “Gravitational Wave Detection” key project, major projects of “Research on Physical Problems Related to Gravitational Waves” of National Natural Science Foundation of China, key projects related to dark matter attributes, “Special Fund for Theoretical Physics”. “Multi-Band Gravitational Wave Universe Research-Taiji Plan Pre-Study” and “Taiji Program for Space Gravitational Wave Detection” of  Strategic Priority Research Program of CAS.

Taiji-1 Satellite Released the Scientific Achievements of the First Stage
Taiji-1 Satellite Released the Scientific Achievements of the First Stage
by admin - Jul 26, 2021

On July 20, the Chinese Academy of Sciences (CAS) held a press conference on the scientific achievements of “Strategic Priority Research Program” in Beijing. WU Yue-Liang, vice president of University of Chinese Academy of Sciences (UCAS) and chief scientist of the Taiji program, on behalf of the scientific collaboration team, released the scientific achievements of Taiji-1 satellite in the first stage.Taiji-1 satellite was officially delivered to UCAS in orbit in January 2020. The results of the first-stage in-orbit test and data analysis show that the Taiji-1 has achieved the highest precision of space laser interferometry in China. The accuracy of displacement measurement of the laser interferometer on Taiji-1 reached 100pm/Hz1/2, 25 pm/Hz1/2 in some frequency bands. The accuracy of the gravitational reference sensor on the satellite reached 10-10ms-2/Hz1/2, and the sensing accuracy and range ratio reaches the best level of 2×10-6/Hz1/2 in China. For the first time in the world, the on-orbit verification of the micro-thruster radio-frequency(RF) ion and dual-mode Hall electric propulsion technology has been realized. The micro-propulsion system achieves 0.15μN/Hz1/2 noise level, and the thrust measurement accuracy is better than 0.02μN/Hz1/2. The first on-orbit experiment of drag-free control of satellite was carried out in China, and the residual acceleration is better than 10-8ms-2/Hz1/2. The temperature control of the satellite platform reaches ± 2.6mk.The results of these in-orbit tests have been published in Communications Physics, one of the Nature-branded journals (read more). The realization of these important indicators verified the feasibility of the key technology of space gravitational wave detection, and took the first step of China's space gravitational wave detection, laying a foundation for China to make a breakthrough in the field of space gravitational wave detection.Meanwhile, International Journal of Modern Physics A of the World Scientific Press has published more detailed experimental results of Taiji-1 in the form of an album, including 26 papers, from more than 180 researchers, more than 30 cooperative units (read more). This album covers the interferometer system, gravity reference sensor, micro-thruster system, drag-free control, ultra-stable and ultra-static satellite technology, and introduces the data processing process of Taiji-1 in detail.In addition, the Taiji team has made great progress in the research of the scientific target of gravitational wave detection in space. For the first time in the world, the Taiji team proposed to use "Taiji-LISA" for networked observation, published in Nature Astronomy, which is expected to improve the accuracy of The Hubble constant to five parts per thousand (read more). The networked observations will allow faster and more accurate positioning of gravitational wave sources and are expected to improve accuracy by up to four orders of magnitude.Taiji-1 was launched from the Jiuquan Satellite Launch Center on 31 August 2019, and it was China’s first satellite to conduct in-orbit experiments on the key technologies related to space-borne Gravitational Wave (GW) detection. It’s also the first step of Taiji program, which is a Chinese space-borne GW detection mission leading by Chinese Academy of Sciences. Taiji-1 has successfully completed all the preset on-orbit experiment tasks, and will further explore the performance limit of the payload on orbit, long life, and optimization of the drag-free control strategy and other expanded experiments.UCAS is the user and scientific application undertaking unit of Taiji-1. The National Space Science Center is responsible for the overall project and the ground support system. The satellite system was developed by the Micro Satellite Innovation Institute of the CAS. The cooperative units participating in the payload development also includes, Institute of Mechanics, CAS, Changchun Institute of Optics, Fine Mechanics and Physics, CAS, Shanghai Institute of Optics and Fine Mechanics, CAS, Innovation Academy for Precision Measurement Science and Technology, CAS, Lanzhou Institute of Physics, CAST, Nanyang Technological University, Singapore etc.

ICTP-AP 2021 Gravitational Wave Summer School Held Successfully in Beijing
ICTP-AP 2021 Gravitational Wave Summer School Held Successfully in Beijing
by admin - Jul 22, 2021

The “ICTP-AP 2021 and Gravitational Wave Summer School” sponsored by ICTP-AP and Taiji Laboratory was successfully held in Beijing from July 15 to 21, 2021. Students from more than 30 universities and research institutes across China went to Beijing to participate in this activity and successfully graduated.                                    At the opening ceremony, Yong Xie, Director of International Cooperation Department of UCAS, brought the First Lesson of School to the students. He talked about the development and innovation of higher education of CAS from 1950s, and brought everyone a comprehensive understanding of UCAS, an innovative university with the integration of science and education as the school mode, postgraduate education as the principle and elite undergraduate education as the school characteristics.Professor Congfeng Qiao, Secretary General of Taiji Consortium, welcomed all the students and introduced the development of Taiji Programme for space gravitational wave detection. He said that it was a long and arduous undertaking to explore the scientific frontier related to gravitational wave, and all students present might be the mainstay of gravitational wave detection in the future, so students need to constantly strengthen their fundamental scientific knowledge and learn about the scientific frontier subjects to lay a solid foundation for future research.In the following week,17 experts and teachers were invited to give more than 20 lectures on gravitation, black holes and quantum universe, gravitational wave detection and precision measurement technology, and discussed about the frontier of theoretical physics science with the students.Students were discussing questions with teachers after classesAt the closing ceremony on the July 21, Academician Yueliang Wu, director of ICTP-AP, gave a lecture on the frontier of gravitational universe and the essence of time and space. He introduced the latest scientific research achievements of “Taiji-1”, the first satellite of Taiji Programme: “Taiji-1” team had put forward the proposal of using “Taiji-LISA” for networking observation for the first time in the world, which was expected to improve the accuracy of Hubble constant to 0.5%, to locate the position of gravitational wave source faster and more accurately, and improve the accuracy by four orders of magnitude. Taiji-1 has completed all preset experimental tasks and achieved the highest precision space laser interferometry in China. It has completed all the performance verification of micro-newton radio frequency ion propulsion and hall-effect micro thruster technology for the first time in the world. It has taken the lead in realizing the breakthrough of two kinds of drag-free control technologies in China, and the sensing accuracy and range of gravitational reference sensor reached the best compared with others in the same level in China, meeting the needs of Taiji-2 and approaching the needs of Taiji-3 in the future. In the ever-changing era, we hope all the students will have great ambitions, be courageous and strive for the development of foundamental sciences.

World Quantum Day on April 14th-China’s Plan Officially Launched
World Quantum Day on April 14th-China’s Plan Officially Launched
by admin - Apr 14, 2021

On April 14, 2021, Quantum Century (2025) China Plan and the first series of lectures on quantum science and technology were successfully held in Beijing. The event was jointly organized by ICTP-AP, the Institute of Theoretical Physics (ITP), the Institute for the History of Natural Sciences (IHNS) and Youth Innovation Promotion Association of CAS. As the kick-off conferenceof “Quantum Century (2025)” in China, this event was broadcast live by KouShare Academic Platform online and offline, attracting more than 2,700 active participants. Academician Yueliang Wu , Vice President of University of Chinese Academy of Sciences (UCAS) and Director of ICTP-AP gave a themed lecture of “Meeting the New Quantum Century and Igniting the New Scientific Revolution”. Wu Yueliang first reviewed the centennial history of quantum theory, then introduced the scientific and technological progress brought by the development of quantum theory, and looked forward to the scientific and technological revolution of quantum in the new century. Finally, he briefly introduced his recent work on “The basics of hyperunified field theory”.Shenghua Hu , deputy editor-in-chief of Science Press and Director of publishing centre,Baichun Zhang , researcher at IHNS and academician of the International Academy of the History of Science jointly gave a themed lecture on “Wang Shoujing and Early Quantum Mechanics Research”, which mainly introduced the contributions made by Wang Shoujing and his research to the development of quantum mechanics. They also briefly summarized the theoretical physics situation in the United States before and after the birth of quantum mechanics and the observation on China’s early development of physics.(left to right:Yueliang Wu,Shenghua Hu,Baichun Zhang)Shangui Zhou , deputy director of ITP, and Xiaowu Guan , deputy director of IHNS attended the kick-off conferenceand delivered speeches. Jinyan Liu, associate researcher at IHNS introduced the origin of “Quantum Century 2025” and proposed more experts and scholars to participate together.(left to right :Shangui Zhou,Xiaowu Guan,Jinyan Liu)In the 20th century, people knew about the micro-world based on quantum mechanics and developed a series of important scientific and technological achievements. The new century of quantum is coming, and there are still many unknowns about quantum. We expect more young scholars to join in relevant research, driving a new round of scientific and technological revolution and industrial transformation, and promote major scientific and technological innovation. Background Introduction of Quantum Century 2025 At the end of the 19th century, physicists gradually realized that classical physics could not explain all the phenomena in the microscopic world reasonably, and began to explore new theories. In 1900, Max Planck first put forward the concept of “quantum”. By the mid-1920s, physicists gradually constructed the core theory of quantum mechanics. In 1925, Heisenberg, Born and Jordan cooperated to develop the matrix mechanics form of quantum mechanics. In 1926, Schrodinger developed the wave mechanics form of quantum mechanics and proved its equivalence with matrix mechanics. The establishment of quantum mechanics has broken the barriers of classical physics, reshaped people's cognition of science and the world, and stimulated a series of major changes in science and technology.“Quantum Century (2025)” was initiated by American Physical Society in 2020. It aims to review the interaction among theory, experiment, technology and culture in the development of quantum mechanics in the past centuryLooking forward to the development of quantum materials, quantum computing and other technologies in the next century, so as to deepen the public's understanding of quantum mechanics. Similar to the International Year of Physics in 2005 and the International Year of Light and Light-based Technologies  in 2015, UNESCO is planning to designate 2025 as the International Quantum Year. At present, research institutions and universities from many countries and regions, such as European Physical Society, European Organization for Nuclear Research, Max Planck Society of Germany, International Centre for Theoretical Physics of Italy, Bohr Archives of Denmark, Joint Institute of Nuclear Research of Russia, Physical Societies of Korea and India have participated in this activity.According to the reduced Planck constant h=4. 13566 × 10 (-15) eV∙s, international physicists suggest that April 14th be designated as the celebration day from 2021. By launching quantum themed activities all over the world, we can review the centennial history of quantum science and look forward to its development in the next century, so as to deepen the public's understanding of quantum science.【相关报道】科学网:http://news.sciencenet.cn/htmlnews/2021/4/456016.shtm

[Summary]Taiji programme appeared at the China's Space Conference
[Summary]Taiji programme appeared at the China's Space Conference
by admin - Sep 20, 2020

太极计划亮相中国航天大会 相关报道抢先看    中科院自2008年开始论证我国空间引力波探测的可行性,提出了我国空间引力波探测“太极计划”,确定“单星、双星、三星”的“三步走”发展战略和路线图。2019年8月,我国首颗空间引力波探测技术实验卫星“太极一号”成功发射,标志着太极计划“三步走”第一步任务目标已成功实现。    在2020年9月18日召开的中国航天大会主论坛上,中国科学院院士、空间引力波探测“太极计划”首席科学家吴岳良发布了“太极二号”双星计划提前迎来的消息。目前,“太极一号”转入拓展实验阶段,“太极二号”双星计划启动后,也正在按照原定计划稳步向前推进。“太极二号”双星计划在整个“太极计划”中具有承上启下的重要意义,以此为契机,“太极计划”计划将于2023年后发射“太极二号”卫星,2033年左右发射“太极三号”卫星,从而完成太空卫星编队的部署。届时,三颗卫星将在绕日轨道上组成一个边长300万公里等边三角形卫星编队,帮助人类更好地探索和认识恒星、星系和黑洞的并和与演化。    吴岳良院士的报告引起了社会的热烈反响,新华社、央视网、中国新闻网、每经网、朝闻天下、光明网等媒体相继报导了这一重大进展。【新闻链接】    新华社:中科院启动“太极二号”双星计划探测空间引力波  http://www.xinhuanet.com/2020-09/19/c_1126515081.htm    央视网:http://news.cctv.com/2020/09/20/ARTIbuuOb3VIeWn6uJgNvEqz200920.shtml    中国新闻网:中科院正按规划路线图启动空间引力波探测计划第二步“太极二号”双星计划http://www.chinanews.com/gn/2020/09-18/9294267.shtml    每经网:http://www.nbd.com.cn/articles/2020-09-20/1508849.html      朝闻天下:http://www.cas.ac.cn/spx/202009/t20200921_4760540.shtml    光明网:https://www.sohu.com/a/419509040_162758    环球科学网:https://finance.sina.com.cn/tech/2020-09-21/doc-iivhvpwy8046170.shtml

2020 UCAS Gravitational Wave Summer School Held Successfully Online
2020 UCAS Gravitational Wave Summer School Held Successfully Online
by ICTP-AP - Jul 17, 2020

From July 13-16, 2020, the 2020 UCAS Gravitational Wave Summer School held successfully. UNESCO International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) and Consortium of Gravitational Wave Detection Taiji Program in Space jointly sponsored this summer school.Due to the corona virus pandemic, the summer school was carried out on "cloud". All the teachers and students shared their opinions and research results through internet. Academician Yueliang Wu, (vice-president of the University of Chinese Academy of Sciences, director of ICTP-AP) academician Wenrui Hu (Institute of mechanics, CAS), and other 14 well-known experts from the ‘Taiji Consortium‘ conducted 16 wonderful lectures on the related research area of gravitational waves detection. Nearly 900 participants gathered online to explore the mysteries of gravitational waves and enjoy the charm of science.2020国科大优秀大学生引力波暑期学校成功举办由联合国教科文组织国际理论物理中心-亚太地区(ICTP-AP)和引力波探测太极联盟联合主办的2020中国科学院大学优秀大学生引力波暑期学校于2020年7月13-16日成功举办。中国科学院大学副校长、国际理论物理中心-亚太地区主任吴岳良院士,中科院力学所胡文瑞院士等14位来自‘太极联盟’的知名专家,围绕着引力波探测相关研究进行了16场精彩的系列讲座。四天时间里,有近九百人相聚“云端”,共话引力波的奥秘,体悟科学的乐趣。 暑期学校部分师生“云合影”受疫情影响,本次引力波暑期学校全程在“云端”进行,教师和学员均通过互联网进行线上互动。同时,充分利用互联网授课模式的优势,对外开放了暑期学校所有讲座,让更多人有机会接触到引力波探测领域的前沿知识。中国科学院院士、‘太极计划’总顾问胡文瑞先生为学员们带来了第一课:空间引力波探索。他为学员们生动的讲述了空间引力波探测发展的来龙去脉。国际理论物理中心-亚太地区主任、‘太极计划’首席科学家吴岳良院士为学员们讲述了‘太极计划’的发展历程,科学目标及技术路线。从放眼未来回归到引力波探测的历史长河,早在100年前,爱因斯坦就预言了引力波的存在,中科院理论物理研究所张元仲研究员详细讲述了相对论与引力波以及引力波的探测史。现在,我们也将成为这见证历史的一员。2015年,美国地面激光干涉引力波天文台(LIGO)首次在人类历史上直接探测到引力波的存在。王运永教授曾在在美国加州理工学院LIGO实验室从事引力波探测工作多年,对引力波探测有丰富的经验和先进的理念。此次暑期学校,他同罗子人研究员、刘河山研究员为学员们带来了空间引力波探测及其中的激光干涉相关知识。惯性传感器不仅在超高精度探测中应用,同时也在相对论基础科学、重力测量等领域都有广泛的应用。徐鹏教授向学员们介绍了它的工作原理和引力波探测器惯性基准,以及空间引力波探测中时间延迟干涉测量的相关知识。电推进和无拖曳控制技术在航天器轨道控制和姿态控制,确保卫星处于“超稳超静”状态中起到了至关重要的作用。贺建武研究员和章楚研究员就相关技术的工作原理和研究现状进行了讲解。在空间中组成卫星编队探测引力波对测量精度要求空前、各环节耦合性强、技术挑战极大。为确保卫星在太空中能够适应太空环境,顺利完成它的“使命”,全链路仿真是唯一能够快速发现任务潜在问题和风险,辅助研发和验证关键技术的有效方法。马晓珊研究员和强丽娥研究员针对空间引力波探测系统仿真技术为学员们带来了相关报告。LIGO自探测到引力波的存在以来,多次获得了黑洞合并的观测数据,韩文标研究员介绍了双黑洞并合引力波的基本原理和性质,曹周键研究员和金洪波研究员为同学们讲授了引力波数据处理与分析的相关知识。7月16日,暑期学校举行了闭幕仪式,邀请了技物所亓洪兴研究员和理论所优秀博士生刘畅作为导师和学生代表分享了自己的科研经历和心得体会。本次引力波暑期学校共有五位学员经专家考核脱颖而出,授予“2020国科大优秀大学生引力波暑期学校-优秀学员”称号,名单公布如下(按姓氏排序):引力波暑期学校为年轻学子提供了一个接触国际学科前沿的平台,将吸引更多的有志青年投身到引力波探测相关研究中。期待他们未来能够成为“太极计划“”的一员,为中国空间引力波探测做出卓越贡献。

Science Never Sleeps, ICTP’s Partner Institutes and Research During Covid-19
Science Never Sleeps, ICTP’s Partner Institutes and Research During Covid-19
by Marina Menga | ICTP - May 21, 2020

In the face of enormous challenges with the Covid-19 pandemic, research institutes around the world are finding ways to overcome the difficulties imposed by lockdown and social distancing.ICTP is meeting the challenge by increasing its offering of virtual seminars and colloquia and providing open source research and training resources. These services have been particularly appreciated by ICTP's partner institutes, regional centres of excellence in physics and mathematics located in Brazil, China, Mexico and Rwanda.Like ICTP, the partner institutes are closed, and all outreach activities such as seminars and workshops have been postponed indefinitely or cancelled. However, their willingness to carry on with research and supply quality learning opportunities is as strong as ever. In a series of recent interviews with ICTP, the heads of the partner institutes shared the strategies they are taking to keep their scientists connected. Technology plays a key role: partner institutes are organizing virtual lectures and are in the process of implementing remote research and distance learning courses. Some admit, though, that the local technology infrastructures are adding to the challenge of staying connected to the rest of the world.Nathan Berkovits, director of the ICTP-South American Institute for Fundamental Research (ICTP-SAIFR) in São Paulo, Brazil, says that many of their courses for graduate students are being held online and that most of the researchers meet regularly with other scientists or with students online through videoconference. Of the many activities that were usually taking place in the institute in São Paulo, several are now taking place online. For example, their weekly journal clubs in the four fields of string theory, particle physics, cosmology and complex systems, are now all happening through online meetings. “We also have an outreach program involving classes for high school students which are being taught online,” said Berkovits, adding, “One advantage is that we are attracting students from all over Brazil, and also from Portugal. So, we are hoping that our online activities will allow us to reach a larger audience than would be possible with activities that require physical presence.”Moreover, in June, two major events will happen online: a one-week workshop on string field theory and a two-week school on particle physics, organized jointly with ICTP.Zhang Min, coordinator of the ICTP-Asia Pacific (ICTP-AP) in Beijing, says that all of the institute’s activities have been cancelled or postponed until the emergency will start to subside, but that at the moment nothing is certain. Recently, China started to see a gradual reopening of activities and most scientists could go back to their offices or laboratories, but the academic courses are still conducted online. However, many concerns for the future of the institute’s research remain. “The COVID-19 pandemic is a global public health emergency,” says Zhang. “COVID-19 is not just altering everyday life; it’s also upending normal research. As universities and institutes across the country go virtual, researchers are scrambling to protect their funding and their careers. Although theoretical research is practically less affected, international cooperation and face-to-face exchanges would be interrupted for a long time.”ICTP’s partner institute in Mexico, the Mesoamerican Center for Theoretical Physics (MCTP), will start a programme of online conferences in the near future. “Nowadays, a lot can be made from home,” says MCTP Director Luis Felipe Rodríguez Jorge, “but there is no substitute to personal interaction. We are starting to realize that this situation may last many months and it will significantly affect interaction with colleagues and research networks.”In Rwanda, the ICTP-East African Institute of Fundamental Research (EAIFR) has cancelled all planned meetings, workshops and conferences, as well as all the travels to or from other research centres. “Students have been directed to online instruction materials for different courses and we have lecturers following them in their progress,” says Director Omololu Akin-Ojo, “but some of them do not have good internet at home, and research has been hampered for them. Our main concern now is to try to facilitate these students to have an improved internet connection wherever they are, so that they can resume their work properly.”ICTP's new virtual seminars initiative has been warmly welcomed by all scientists in its partner institutes, as they see it as a wonderful opportunity to learn and follow up on science while far away and even in isolation, provided that technological limits are not too difficult to overcome. “ICTP has helped us by opening up their seminars to us over the Internet. We are grateful for this,” says Akin-Ojo.The institutes’ directors agree that while in lockdown at home, most people have more time for personal research and they are taking advantage of the possibility to access more publications, books or audio-visual materials from ICTP’s archives.“As one of the most successful international organizations, ICTP is doing very well in cultural transmission, management and activities,” says Zhang. “ICTP-AP would like to follow the ripe experience from ICTP to grow fast.”Berkovits is also turning to ICTP to cope with the current situation. “It would be great to learn from the experiences of ICTP Trieste,” says Berkovits. “Director Atish Dabholkar and other ICTP-Trieste faculty invited our faculty to a videoconference meeting a few weeks ago where we discussed possible joint online activities, some of which are already taking place.”Apart from the possibility to take part in online seminars and conferences, the availability of scientific papers is fundamental to keep track of research around the world, and therefore the theme of open access is an important consideration for all of the directors. “I was really impressed by the action taken by several journals to give open access to their material,” says Director Rodriguez Jorge. And his view is shared by ICTP-AP Director Zhang: “The present pandemic makes us further recognize the importance for promoting widespread awareness and boundary-breaking ideas. ICTP-AP would promote open access data and collaborative analysis for global scientists in right time.”Many other opportunities can arise from adversity, especially if research is involved. At SAIFR, a research group is actively working on mathematical models for epidemics. The group had organized a workshop at the beginning of March on Modelling of Infectious Diseases Dynamics. The organizer of this workshop, Roberto Kraenkel, is now the leader of a team which monitors the disease in São Paulo. At EAIFR, they are considering to undertake research on the photo-degradation of parts of the covid-19 (SARS-CoV-2) virus. “There is some indication that sunlight stops the functioning of the virus,” says Akin-Ojo, “and it would be interesting to know more.”It is clear that in times of crises, science builds communities and keeps people together. “The aspect of physics that has most impressed me is the willingness of researchers to sacrifice their time to give online lectures,” says Berkovits. “There is no monetary compensation, they do not get to travel to new places, and they do not even hear applause at the end of their presentation, which is much more difficult to prepare than an ordinary lecture. Nevertheless, the overwhelming majority of physicists accept invitations to give online lectures.”

Space Gravitational Wave Detection Taiji Consortium 2019 Annual Meeting Held Successfully
Space Gravitational Wave Detection Taiji Consortium 2019 Annual Meeting Held Successfully
by admin - Nov 26, 2019

On November 24, space gravitational wave detection Taiji consortium 2019 annual meeting held successfully at University of Chinese Academy of Sciences (UCAS). The UNESCO International Centre for Theoretical Physics Asia-Pacific (ICTP-AP), and Taiji consortium jointly sponsored this meeting. The conference focused on the research of gravitational wave physics and the detection technology. It has attracted active participation of more than 160 experts and scholars from 36 institutions to discuss the latest scientific results and future development of gravitational wave detection.Yanfen Wang (vice-president of UCAS), Wenrui Hu (chief scientific adviser of Taiji Programme, Institute of Mechanics CAS), Min Huang (deputy commissioner of Bureau of Frontier Science and Education CAS), Xiaolong Dong (deputy director of National Space Science Center CAS) and Zijie Li (deputy chief of Photoelectric and Universe Section of Bureau of Major R&D Programs CAS) on behalf of Yingjie-Yu commissioner attended the meeting and delivered speeches.Yanfen Wang, on behalf of UCAS, extended a sincere welcome to all the representatives and congratulated the convening of the 2019 Taiji consortium meeting. In her speech, she stressed that Taiji consortium is not only an important platform for all-round and multi-disciplinary scientific cooperation among academic institutions but also important support for the cultivation of innovative talents in related fields.In May 2017, Taiji working group initiated and founded the ‘Taiji Consortium’ on the International Symposium on Space Gravitational Wave Detection. As an academic consortium, it brought experts in related fields together to carry out the research of gravitational wave space exploration.Taiji-01, the first satellite of Taiji programme, successfully launched into orbit on 31 August 2019. This means that the first step of the ‘three-step development’ strategy of ‘Taiji Program’ was initiated. The on-orbit test and data analysis results of Taiji-01 shows that:The first-stage in-orbit test showed that the accuracy of displacement measurement of the laser interferometer on Taiji-01 could reach a 100-picometer order of magnitude, equivalent to the size of an atom.The accuracy of the gravitational reference sensor on the satellite reached ten billionths of the magnitude of the earth's gravitational acceleration, equivalent to the acceleration produced by an ant pushing the Taiji-01 satellite.The thrust resolution of the micro-thruster on the satellite reached a scale equivalent to one-ten thousandth of the weight of a sesame grain.Taiji-01 Achieved:    China’s highest accuracy of spatial laser interferometry.    China’s first on-orbit drag free control technology test.     Firstly and internationally on-orbit verification of micro-newton level radio frequency ion propulsion technology and dual mode hall-effect micro thruster technology.As the chief scientist of Taiji programme, professor Yueliang Wu, vice-president of UCAS, director of ICTP-AP, made a scientific interpretation of gravitational wave detection, and reported the progress of the orbit test of Taiji-01.Professor Jianyu Wang, president of Shanghai Branch of CAS and chief engineer of Taiji-01 project, reported and summarized the Taiji-01 satellite project.Professor Ronggen Cai, deputy director of the Institute of Theoretical Physics CAS introduced the relevant knowledge of gravitational waves and the significance of exploring gravitational waves from the perspective of fundamental physics research.Professor Weidou Ni from the National Astronomical Observatories CAS introduced his views on the future planning of the world's gravitational wave exploration and the discussion of the Taiji space gravitational wave detection mission.32 experts and scholars from 21 scientific institutions made academic reports on the relevant research of Taiji programme. This annual meeting provides a platform for cooperation and communication among members of Taiji consortium. It promotes in-depth exploration of scientific connotation and improves the influence of Taiji plan. Moreover, it also promotes interdisciplinary integration and the achievement of China's goal of space gravitational wave detection.