Proposal: Theoretical Physics
Theoretical Physics is at 96% commitment now! That means that launch is probably imminent.
You need a URL sub-domain though. And, well, you can't take
physics.stackexchange because that belongs to the existing physics.stackexchange.com.
Theoretical Computer Science, which is in ways parallel to Computer Science what this is to Physics, they have the subdomain
cstheory.stackexchange. We could try something similar (phystheory? phytheory? pheory?).
Or if you have any other ideas, those could work as well! What do you think would make a good sub-domain?
Please post one suggestion per answer. If you have a second (or revised) suggestion, please post it as a separate answer for voting.