Tianlai experiment

[1][2] Its aim is to develop the key techniques of intensity mapping observation for the redshifted 21cm line of neutral hydrogen, in order to probe the large-scale structure, and to detect and measure the dark energy using baryon acoustic oscillations (BAO).

In the full scale stage, the experiment is expected to measure the large scale structure, and use the BAO feature to detect the dark energy [3] The "Key Technologies of Radio Detection of Dark Energy" research is funded in 2012.

[6][7] The Tianlai arrays are located at (91°48′ E, 44°09′ N), the signal collected by these arrays are transmitted via optical fiber to the station house, which is about 6 km away in the Hongliuxia village of the Balikun County, Xinjiang, China.

[10][11] The arrays are planned to carry out HI surveys and cross correlate with optical observations.

It is a concept which was first used by the ancient Chinese philosopher Zhuang Zhou, to mean a hidden rhythm of the nature.