Astrophysics Seminars

The formation and evolution of the giant planets of our Solar System presents several problems: the cores of the planets should have been driven into the Sun by Type I migration, faster than they could accrete their massive gaseous atmosphere; once...

The X-ray flux of accreting black holes occasionally shows a pair of quasi-periodic oscillations with frequencies in a 3:2 ratio having values comparable to the orbital frequency at the innermost stable circular orbit. The cause and nature of...

Note: This talk is orthogonal to the one he gave at the symposium "The Variable Universe: A Celebration of Bohdan Paczyski" held at Princeton University this September. So this new talk would be of interest even if people saw the symposium talk...

I describe three methods to quantify dark matter clustering, making full use of precision measurements of galaxy clustering and weak lensing from recent galaxy redshift surveys. First, using galaxy clustering measurements on small scales, I infer...