Today Jason Cao (NYU) defended his PhD on the galaxy–halo connection in cosmology. He has built a stochastic version of subhalo abundance matching that has a stochastic component, so he can tune the information content in the galaxies about their host halos. This freedom in the halo occupation permits the model to match more observations, and it is sensible. He also explored a bit the properties of the dark-matter halos that might control halo occupation, but he did so observationally, using satellite occupation as a tracer of halo properties. These questions are all still open, but he did a lot of good work towards improving the connection between the dark sector and the observed galaxy populations. Congratulations, Dr Cao; welcome to the community of scholars!
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