D. Friedan, "A tentative theory of large distance physics", hep-th/0204131
String theory failed as a theory of physics because of the existence of a
manifold of possible background spacetimes. All potentially observable
properties of string theory depend on the geometry and topology of the
background spacetime in which the strings scatter.
The long-standing crisis of string theory is its complete failure to
explain or predict any large distance physics. String theory cannot say
anything definite about large distance physics. String theory is
incapable of determining the dimension, geometry, particle spectrum and
coupling constants of macroscopic spacetime. String theory cannot give any
definite explanations of existing knowledge of the real world and cannot
make any definite predictions. The reliability of string theory cannot be
evaluated, much less established. String theory has no credibility as a
candidate theory of physics.
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