303 | AMA | February 2025

8647.443 - 8668.26 Sean Carroll

That's why string theory is so popular because you think that you really are looking for a theory that is complete. Indeed, the phrase that is used is an ultraviolet complete theory, a theory that works up to arbitrarily high energy scales. And I'm even underselling the problem with gravity because it's not just that gravity itself is non-renormalizable and gives you infinities at high energies.