To specify the Universe, you only have to specify enough information to pick it out from the landscape of all possible Universes
Of course not. You have to specify the landscape itself, otherwise it’s like saying “page 273 of [unspecified book]” .
According to string theory (which is a Universal theory in the sense that it is Turing-complete)
As far as I can see, that is only true in that ST allows Turing machines to exist physically. That’s not the kind s of Turing completeness you want. You want to know that String Theory is itself Turing computable, not requiring hypercomputation. Or whatever is actually the ultimate physical theory. Because K complexity doesn’t work other wise. And the computability of physics is far from a given:-
Note that the fact that a theory might consist of a small number differential equations is quite irrelevant, because any one equation could be uncomputable.
Of course not. You have to specify the landscape itself, otherwise it’s like saying “page 273 of [unspecified book]” .
As far as I can see, that is only true in that ST allows Turing machines to exist physically. That’s not the kind s of Turing completeness you want. You want to know that String Theory is itself Turing computable, not requiring hypercomputation. Or whatever is actually the ultimate physical theory. Because K complexity doesn’t work other wise. And the computability of physics is far from a given:-
https://en.m.wikipedia.org/wiki/Computability_in_Analysis_and_Physics
Note that the fact that a theory might consist of a small number differential equations is quite irrelevant, because any one equation could be uncomputable.