The Dark Age and Cosmic Dawn

Recently, the EDGES experiment announced their detection of a strong absorption feature at 78 MHz, which may be the sign of cosmic dawn. In this talk, I review the observation feature of the dark age and cosmic dawn, the physics involved, and the observation techniques. I then discuss various models proposed to explain this feature. Finally, I will describe an ongoing research program for launching an array of microsatellites in lunar orbit in order to probe the dark age and the cosmic dawn.

Speaker: 
Xuelei Chen
NAOC
Speaker Introduction: 

 Xuelei Chen is a professor of the National Astronomical Observatories, Chinese Academy of Sciences (NAOC). His reseach interest includes test of cosmological models, reionization, and 21cm observations. He is the PI of the cosmic dark matter and dark energy group in NAOC, the leader of the Tianlai (heavenly sound) 21cm intensity mapping project,and PI of the lunar orbit long wave interferometer array project. He received his Ph.D. from Columbia University in 1999, and has more than a hundred publications. 

Place: 
KIAA-PKU Auditorium
Host: 
Peng Yingjie
Time: 
Thursday, April 26, 2018 - 4:00pm to 5:00pm