New Orientifold Weak Coupling Limits in F-theory

Details New Orientifold Weak Coupling Limits in F-theory New Orientifold Weak Coupling Limits in F-theory

2009-08-11

arxiv.org/abs/0908.1572v3

JHEP 1002:020,2010

Physics

High Energy Physics

High Energy Physics - Theory

45 pages, typos corrected

Scientific paper

10.1007/JHEP02(2010)020

We present new explicit constructions of weak coupling limits of F-theory generalizing Sen's construction to elliptic fibrations which are not necessary given in a Weierstrass form. These new constructions allow for an elegant derivation of several brane configurations that do not occur within the original framework of Sen's limit, or which would require complicated geometric tuning or break supersymmetry. Our approach is streamlined by first deriving a simple geometric interpretation of Sen's weak coupling limit. This leads to a natural way of organizing all such limits in terms of transitions from semistable to unstable singular fibers. These constructions provide a new playground for model builders as they enlarge the number of supersymmetric configurations that can be constructed in F-theory. We present several explicit examples for E8, E7 and E6 elliptic fibrations.

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