I have a few question on the nature of the body of knowledge referred to as string theory.
Is this an actual new physical theory of reality, or a new mathematical framework for expressing possible physical theories?
If it is the former, what new behaviors of the universe, beyond those of QM and GR, are anticipated? Does string theory require QM and GR, or merely allow them?
If it is the latter, what processes can be explained more concisely using string theory rather than tensor arithmetic? What level of explanatory power would a rival split-octonion representation need to achieve to rival string theory?