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Just because the D1-string has the right dimensionality to couple to a 2-form RR potential doesn't mean that it must. The same line of reasoning could be applied to the more familiar case of electromagnetism; you could easily imagine a world with 2 different U(1) gauge fields. There could be particles that are charged under gauge field #1, particles charged ...


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There is a confusion and misunderstanding about what "perturbative" means and its relation with the power series expansion around certain small parameter. If you state that QED/QCD is non-perturbative, because amplitudes are defined exactly, and not as a power expansion, then the same applies to string theory. Amplitudes, in any QFT, is defined a sum over ...



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