I have a strong computer science background, and I'm contemplating applying to graduate school in physics in the coming year or two. However, other than a general love of the subject, I don't really feel that I currently have the focus that I would need to have my application taken seriously. ("Physics is cool" really doesn't cut it as a statement of purpose.) I certainly don't expect to pre-select a thesis topic, but I would like to get some idea on how I could possibly take advantage of my computer science background to both gain admission and be successful in graduate school. What sort of specialities should I be looking into? Thanks for any advice and recommendations.