We review various aspects of de Sitter spacetime in string theory: its status as an Effective
Field Theory spacetime solution, its relation to the vacuum energy problem in string theory …

Abstract Foreword; Preface; Notation; 10. Type I and type II superstrings; 11. The heterotic
string; 12. Superstring interactions; 13. D-branes; 14. Strings at strong coupling; 15 …

We compute the prepotentials and the geometry of the moduli spaces for a Calabi-Yau
manifold and its mirror. In this way we obtain all the sigma model corrections to the Yukawa …

Just as parallel threebranes on a smooth manifold are related to string theory on AdS 5× S 5,
parallel threebranes near a conical singularity are related to string theory on AdS5× X5, for a …

Recently it has been shown that there are paths on the moduli space between two Calabi-
Yau manifolds with different topology that have finite length. A priori, there exists the …

We present an accessible account of the local geometry of the parameter space of Calabi-
Yau manifolds. It is shown that the parameter space decomposes, at least locally, into a …

We describe a duality in the moduli space of string vacua which pairs topologically distinct
Calabi-Yau manifolds and shows that the yield isomorphic conformal theories. At the level of …

A special manifold is an allowed target manifold for the vector multiplets of D= 4, N= 2
supergravity. These manifolds are of interest for string theory because the moduli spaces of …

Low-energy effective field theories arising from Calabi-Yau string compactifications are
generically inconsistent or ill-defined at the classical level because of conifold singularities …

We describe string vacuum configurations for which the radii (moduli) of the internal compact
space vary in four-dimensional space-time, focusing on configurations which have the …