Abstract
I suggest the possibility of a new string in ten dimensions. Evidence for this string is presented both from orientifold physics and from K-theory, along with a mystery concerning the M-theory description. Motivated by this possibility, 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. These decoupled theories provide the matrix model definitions of the heterotic/type I strings.
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ArXiv ePrint: 1304.1551
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Sethi, S. A new string in ten dimensions?. J. High Energ. Phys. 2013, 149 (2013). https://doi.org/10.1007/JHEP09(2013)149
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DOI: https://doi.org/10.1007/JHEP09(2013)149