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Semi-flatland
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DOI：10.1088/1126-6708/2008/10/068.png)
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Abstract
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We study perturbative compactifications of Type II string theory that rely on a fibration structure of the extra dimensions a la SYZ. Non-geometric spaces are obtained by using T-dualities as monodromies. These vacua generically preserve N = 1 supersymmetry in four dimensions, and are U-dual to M-theory on G(2) manifolds. Several examples are discussed, some of which admit an asymmetric orbifold description. The massless spectrum is matched to that of the dual M-theory compactification on a Joyce manifold when a comparison is possible. We explore the possibility of twisted reductions where left-moving spacetime fermion number Wilson lines are turned on in the fiber. We also give an explanation from this semiflat viewpoint for the Hanany-Witten brane-creation effect and for the equivalence of the Type IIA orientifold on T-5/Z(2) and Type IIB on S-1 x K3.
Keywords:
Superstring Vacua
F-Theory
M-Theory
D-branes
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5.5
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