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" ... If you've ever heard the word "compactification" used in the context of string theory, this is what it means: a hand-waving suggestion that somehow, these extra dimensions and that additional parameter (ω) become unimportant. String theory, on its own, doesn't offer a compelling way to get rid of these extra dimensions or to make the Brans-Dicke parameter unimportant. And it must be unimportant; the original work that Brans and Dicke put forth suggested that a ω of around 5 might be interesting; modern tests of relativity have shown it must be greater than ~10,000 or so. ... "