Hi, I'm entering my senior year as an undergraduate and will soon be applying to grad school. I go to a small university that has an excellent undergraduate research policy which has allowed me to have experienced working in experimental and theoretical(computational) physics. I know one of the biggest choice besides chooses a sub-field is to decide whether to be an experimentalist or a theorist. I really hated working in the lab and was just didn't enjoy the entire process of experimentalism. On the other hand I've been working with a computational physicist and have really enjoyed the work and the way that things work on that side. I enjoy the theory and always thought as I was going I wanted to do both, experimentalism and theory. Computational physics has that going for it. It's theoretical but you kinda do numerical experiments of which I liked the idea.(computers are much more reliable than lab equipment =(. ) So basically I've decided I want to be a theorist, but I understand there are sub-fields within the discipline and was curious what those options are and what each type do. The only one I am familiar with is computational or I'd list of some other examples. To paraphrase all of that, I like theory and have worked in computational physics and am curious what other types of theoretical physics there are and maybe a brief description of what each type do and maybe the fields of phyiscs they work in. (I am mostly interested in condensed matter and high energy/particle physics. I have experience with condensed matter but not with particle.) Thanks in advance.