What is dark matter? How much is there and what are its properties? How is it distributed in space?

What is the relationship between galaxies and the dark matter halos in which they live? How do galaxies and halos co-evolve, and how are they affected by their environment?

These are some of the questions that I am trying to answer. Broadly, my research is in the areas of Cosmology and Extragalactic astronomy. Particular interests are