1304.1551 (Savdeep Sethi)
Savdeep Sethi
I propose the existence of a new superstring theory in ten dimensions. At the perturbative level, the theory is identical to type I string theory. Non-perturbatively, the spectrum is quite different. The strong coupling limit is not described by a known string theory. Evidence for this string is presented both from orientifold physics and from matrix theory. Some novel aspects of decoupling limits in heterotic/type I theories are described; specifically, the decoupled theory on type I $D$-strings is argued to be three-dimensional rather than two-dimensional.
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http://arxiv.org/abs/1304.1551
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