i was always under the impression that they didnt work together, and that this was one of the big mysteries that all physicists were working on, a grand unified theory of everything. perhaps one reason they don't work together is that relativity treats time as a thing, and not as a concept, which it is. 'time' doesnt exist, it is a measure of change, nothing more. to reify it, as in space-time, clearly creates many theoretical problems.