Our group was one of the first to show that active black holes are likely to play a key role in the history of galaxy formation. Now we are measuring that heating by comparing precision microwave background measurements with large cosmological simulations.
Unlike turbulence on the Earth, cosmic turbulence is often supersonic. Our group was the first to study mixing in supersonic turbulence, and we are now studying its connection to early star formation, the evolution of galaxies and galaxy clusters, and the growth of magnetic fields.
Our group was the first to show that the first generation of stars formed a large range of redshifts. Recently we have developed subgrid models of turbulent mixing that are allowing us track the evolution of their formation in unprecedented detail.