Chasing Brane Inflation in String-Theory

We investigate the possibility of embedding brane anti-brane inflation into a concrete type IIB string-theory compactification with all moduli fixed. In particular, we are considering a D3-brane, whose position represents the inflaton φ, in a warped conifold throat with a supersymmetrically embedded D7-brane and an anti D3-brane localized at the tip of the conifold cone. After presenting the moduli minimization analysis for a general embedding of the D7-brane, we concentrate on an explicit model, analyzing whether all forces acting on the D3-brane might cancel by fine-tuning, except for the Coulomb attraction of the anti D3-brane. For a large class of D7-brane embeddings we obtain a negative result: cancelations are possible only for very small intervals of φ. For the most part of its motion, the inflaton feels a steep, non slow-roll potential. We study the cosmological evolution induced by this potential. [email protected] [email protected]