It's important to remember that we know very well that we don't live in an AdS space. It's actually not all that likely that many of these theories apply to a d

It's important to remember that we know very well that we don't live in an AdS space. It's actually not all that likely that many of these theories apply to a de Sitter space-time like our universe, though it remains to be seen. That is, even if the AdS/CFT correspondence is true, it may still turn out that the dS/CFT correspondence is not, and so the results are not applicable to the physical universe.