I agree with Tegmark's MUH, and have written a paper defining a class of mathematical structure, and a particular mathematical set, which seems to have emergent properties matching our Universe.
The set has quantised space and time which are themselves emergent, and emergent phenomena such as spacetime warping consistent with gravity and dark energy. It has early behaviour similar to inflation. It dynamically creates universes with three space dimensions and dark matter. The dark matter feature constitutes a fifth level in Tegmark's Level IV Multiverse, which makes this mathematical set more likely to be the one we are in.
I submitted it to Foundations of Physics citing Tegmark's paper, and received a strange response: "The author of this manuscript fails to make clear how his/her work relates to current discussions in the foundations of physics. This is not a judgement about the quality of the contents of the submission, but, regrettably, does place the submission outside the scope of Foundations of Physics. Perhaps a theoretical physics journal would be more suitable?"
I would appreciate some feedback, and have included the paper as an attachment.
Yours sincerely,
Ben Edmundson