Cosmology is the study of the history of our universe on the largest scales that exist. On scales between individual galaxies and galaxy clusters, the universe evolves primarily due to the distribution of dark matter, and on even larger scales, the universe is driven by dark energy. Observational cosmology is conducted in a variety of ways, including observing many type-IA supernovae (standard candles), fluctuations in the density of visible matter over large scales (baryon acoustic oscillations), and the remnant radio light from the very early Universe (cosmic microwave background). More recently, by combining gravitational-wave and electromagnetic signals from a single source (standard sirens), we can construct yet another way to measure the Universe. We can also observe the hydrogen gas between galaxies and its distribution throughout the Universe (21-cm cosmology).
Researchers in this area include:
Sean McWilliams (standard sirens)
Kevin Bandura (21-cm cosmology)