Physicist Max Tegmark proposed a hypothesis that asserts that all mathematical structures do exist as universes. (https://en.wikipedia.org/wiki/Mathematical_universe_hypothesis)
But this hypothesis just assumes that mathematical existence equals physical existence.
This is contrary to other theories and models which predict some kind of multiverse but are based on some framework (e.g string theory, which is based on the assumption of the existence of strings)
So, is it there any model or theory in physics (based in some framework) that is equivalent to Tegmark's hypothesis in the sense that it could predict as much universes as his Mathematical Universe Hypothesis?
Tegmark says that since all mathematical structures have some type of symmetry, these would exist as physical symmetries (https://en.wikipedia.org/wiki/Symmetry_(physics)
So, is it there any theory or model in physics that could produce all types of symmetries?