Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-05-22
Nucl.Phys.B475:562-578,1996
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX file, 21 pages, references added
Scientific paper
10.1016/0550-3213(96)00347-1
By analyzing $F$-theory on $K3$ near the orbifold limit of $K3$ we establish the equivalence between $F$-theory on $K3$ and an orientifold of type IIB on $T^2$, which in turn, is related by a T-duality transformation to type I theory on $T^2$. By analyzing the $F$-theory background away from the orbifold limit, we show that non-perturbative effects in the orientifold theory splits an orientifold plane into two planes, with non-trivial SL(2,Z) monodromy around each of them. The mathematical description of this phenomenon is identical to the Seiberg-Witten result for N=2 supersymmetric $SU(2)$ gauge theory with four quark flavors. Points of enhanced gauge symmetry in the orientifold / $F$-theory are in one to one correspondence with the points of enhanced global symmetry in the Seiberg-Witten theory.
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