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Motivated by the desire to do proper model building with D7-branes andfluxes, we study the motion of D7-branes on a Calabi-Yau orientifold from theperspective of F-theory. We consider this approach promising since, by workingeffectively with an elliptically fibred M-theory compactification, the explicitpositioning of D7-branes by (M-theory) fluxes is straightforward. The locationsof D7-branes are encoded in the periods of certain M-theory cycles, whichallows for a very explicit understanding of the moduli space of D7-branemotion. The picture of moving D7-branes on a fixed underlying space relies onnegligible backreaction, which can be ensured in Sen's weak coupling limit.However, even in this limit we find certain 'physics obstructions' which reducethe freedom of the D7-brane motion as compared to the motion of holomorphicsubmanifolds in the orientifold background. These obstructions originate in theintersections of D7-branes and O7-planes, where the type IIB coupling can notremain weak. We illustrate this effect for D7-brane models on CP^1 x CP^1 (theBianchi-Sagnotti-Gimon-Polchinski model) and on CP^2. Furthermore, in thesimple example of 16 D7-branes and 4 O7-planes on CP^1 (F-theory on K3), weobtain a completely explicit parameterization of the moduli space in terms ofperiods of integral M-theory cycles. In the weak coupling limit, D7-branemotion factorizes from the geometric deformations of the base space.

D7-Brane Motion from M-Theory Cycles and Obstructions in the Weak Coupling Limit