Probing growth of structure & star-formation history in the Universe

The acceleration of the Universe is one of the biggest puzzles in physics: is it due to a cosmological constant, dynamical dark energy, or modification of gravity?  A detailed measurement of growth of structure is required to answer this question.  In the first part, I will talk about how galaxy cluster surveys are essential for measuring growth of structure and for constraining cosmic acceleration.  I will focus on current and next-generation optical imaging surveys, as well as the synergy with X-ray, submillimeter, and spectroscopic surveys.  In the second part, I will talk about how to probe cosmic star-formation history using cosmic far-infrared background (CIB), which originates from unresolved, dusty star-forming galaxies across cosmic time.  Combining tools from intensity mapping surveys and galaxy evolution models, I interpret the CIB measurements from Planck satellite and constrain cosmic star-formation density beyond resolved UV and IR sources.  

Speaker: 
Hao-Yi Wu
The Ohio State University
Place: 
KIAA-PKU Auditorium
Host: 
Ran Wang
Time: 
Friday, January 3, 2020 - 3:00pm to 4:00pm