Supergravity Solutions for Seven-branes

Nonperturbative effects on D7-branes play a key role in flux compactifications of type IIB string theory, but are usually described only in the four-dimensional effective theory, precluding ten-dimensional analysis of the corresponding vacua. I will first argue that gaugino condensation on D7-branes sources three-form flux in ten dimensions. I will then present new supersymmetric solutions of ten-dimensional supergravity that encode gaugino condensation on (p,q) seven-branes. Applications of these results to four-dimensional cosmological model-building will be discussed.