I've read in a magazine (Scientific American, November 2005, pages 32-39) that such a negative curvature spacetime as the anti- de Sitter one is a key link to the holographic universe theory. They say the H.U.T. was useful in analyzing the results of a high-energy experiment.
I just wonder, if it helped them draw correct conclusions wouldn't that mean the theory must be correct, therefore we're living in a negative curvature universe. This means there will be no Big Crunch. However they say that's not for sure. Then how do they know the theory (and the conclusions related to that experiment) is correct?