New Type IIB Vacua and their F-Theory Interpretation
Abstract
We discuss a D3-D7 system in type IIB string theory. The near-horizon geometry is described by AdS5 x X5 where X5 is a U(1) bundle over a Kahler-Einstein complex surface S with positive first Chern class c1>0. The surface S can either be P1 x P1, P2 or Pn1,...,nk, a blow up of P2 at k points with 3≤ k≤ 8. The P2 corresponds to the maximally supersymmetric AdS5 x S5 vacuum while the other cases lead to vacua with less supersymmetries. In the F-theory context they can be viewed as compactifications on elliptically fibered almost Fano 3-folds.
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