Hello, I'm an undergrad in my third year with a major in mathematics and physics. Needless to say, since I'm in my third year, I'm looking into going into graduate school and at graduate programs. But I have a large problem: I really like the fact that I'm doing both math and physics. I really do not wish to pick between the two (I couldn't when I started my undergrad, and now that I'm going to be heading into graduate school, I still don't wish to choose between the two). My own personal goal is, after PhD and post-doc, to join a university where I can become a professor in both physics and mathematics, where I could teach both mathematics and physics courses as well as do mathematics (in the area of geometry) and theoretical physics (cosmology, particularly in gravity) research. Are there any schools which offer graduate programs to get both physics and mathematics PhDs?