This is, I guess, my foray into the bloggy string wars (or the stringy blog wars?). But not really. I just want to give you some of my brief perspectives on why string theory is kind of a big deal. This will possibly precipitate screaming and gnashing of teeth in the comments section, but whatever. It is not my intention to get into some sort of flamewar (or whatever the kids are calling it nowadays) so I probably won’t respond to any comments.
A short list of what you might think string theory is good for.
1. Nothing–unlike a lot of my colleagues, I think this is a perfectly reasonable perspective. In fact, if you had this perspective about all of particle physics, I think it also would be perfectly reasonable. In short, what we do benefits absolutely nobody. We should all probably be using our brains to search for a cancer cure.
However, I find to stomach arguments that other completely useless things–like calculating the QCD beta function to n loops, or calculating the homotopy groups of spheres is somehow more worthy. Usefulness is not why most people engage in many areas of math and physics.