Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-07-07
Nucl.Phys. B479 (1996) 260-284
Physics
High Energy Physics
High Energy Physics - Theory
Harvmac, 30 pages (big). Additional argument relating orientifolding ambiguity to discrete torsion inserted near the end of Se
Scientific paper
10.1016/0550-3213(96)00460-9
We study orbifold compactifications of F-theory which lead to $N=1$ supersymmetry in 6 and 4 spacetime dimensions. These are dual to specific orientifolds of M-theory, and in many cases to orientifolds of type IIB string theory. The equivalences are demonstrated by mapping the orbifolding transformations in the F, M and string theories to each other using dualities. We observe that M and F-theory appear to possess a property similar to discrete torsion in string theory. This is related to an ambiguity recently noted by Polchinski in the orientifold projection for 6-dimensional models. The 4-dimensional compactifications exhibit similar features, from which we predict the existence of certain new orientifolds of type IIB. Some orbifolds with higher supersymmetry are also examined.
Gopakumar Rajesh
Mukhi Sunil
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