China's space gravitational wave detection | 'Tianqin Plan' | Key technologies have made significant progress

On September 27th, the S45 academic seminar of the Xiangshan Science Conference held in Guangzhou, Guangdong Province, received the latest news about the 'Tianqin Project'. The current 'Tianqin Program' has made significant progress in several key technologies, including Inertial sensing, laser interferometry, no-drag control, satellite platforms and many other major technologies, these technologies will continue to enter the in-orbit verification phase.

At present, there are four main methods for gravitational wave detection, namely ground detection, space detection, pulsar timing array and cosmic microwave background radiation observation. Among them, space gravitational wave detection is to study the dense double star revolving in the Milky Way, medium scale on the cosmic scale. Combines with massive black holes, an irreplaceable means of extreme mass than the system.

Since the 1970s, China has begun research on gravitational wave detection. After decades of efforts, China has accumulated a good foundation in the core technology of space gravitational wave detection. In March 2014, the team of Chinese scientists officially An autonomous space gravitational wave detection plan was proposed and named 'Tianqin Plan', and in December 2014, at the first International Symposium on Space Science Tasks in Tianqin, the '0123' of the 'Tianqin Plan' was proposed. Step by step implementation road map.

The 'Tianqin Plan' plans to launch three satellites in low Earth orbit to form an equilateral triangle satellite formation, through inertia. sensor , laser interferometry and other core technologies, 'perceive' gravitational wave signals from the universe, explore the secrets of the universe. Three stars, shaped like a harp in space, can listen to the 'sound' of gravitational waves in the depths of the universe This is the space gravitational wave detection 'Tianqin Plan' proposed by Chinese scientists.

The 'Tianqin Plan' and the European LISA Plan are currently a few space gravitational wave detection programs based on mature designs and solutions in the world. Both plans are moving forward in a race against time. The main difference between the two plans is that their design tracks are around the earth. One around the sun, and the detection band is slightly different.

The smooth implementation of the Tianqin program is inseparable from the international cooperation. It is necessary to bring together scientists from all over the world to carry out innovative research on the core key technologies of all aspects of space gravitational wave detection, and break through the bottleneck of ultra-high precision measurement technology. Courier research, multi-band detection, multi-method fusion, multi-field cooperation, multi-disciplinary crossover, to achieve high-precision detection of space gravitational waves, while Tianqin can also extend the research scope to geophysical, solar physics and other disciplines.

It is understood that since the launch of the 'Tianqin Plan', universities or research institutions in Russia, Italy, Britain, Germany, the United States, Australia, France and other countries have expressed clear intentions to participate, and some have carried out corresponding cooperation.

'Tianqin Plan' is an original space gravitational wave detection program independently proposed by China, which contributes to China's wisdom and China program for solving major scientific problems in the field of space gravitational wave detection. It reflects China's promotion of world science and technology innovation and development. The global scientific and technological resources layout, the responsibility of building the community of human destiny, has important scientific value and significance.