Theoretical Physicists - What Do You Do?

I call myself more a theoretical physicist because I like to work on a broad range of topics, some of which will be directly related to cosmology. But basically I do quantum, I'm doing quantum field theory and some theoretical physicists really, I apply it to gravity. Without going into the details of this physics that I couldn't possibly understand, I can never quite understand how your job works from the research. It is hard to test us something. A theory that is actually, is it very high energy scales and we can't reach those energy scales. So what can you do? And so one approach I've taken is, say with dark energy, which has been a big part of my