Xin chào! This is Minh Nguyen from MPA.
Galaxy clusters consist of hundreds to thousands of galaxies bound together by gravity. Growing from quantum fluctuations in the early universe, they encode information about the entire history of our universe. Extracting this information and inferring cosmology from galaxy redsfhit surveys, however, is a highly non-trivial task - as the physics of galaxy formation is neither linear nor local. In fact, it has been the weakest link between theory and observation... And that is where I would like to focus on.