This review article provides a pedagogical introduction into various classes of chiral string
compactifications to four dimensions with D-branes and fluxes. The main concern is to …

This review is devoted to open strings, and in particular to the often surprising features of
their spectra. It follows and summarizes developments that took place mainly at the …

We investigate the correspondence between existence/stability of BPS states in type-II string
theory compactified on a Calabi-Yau manifold and BPS solutions of four-dimensional N= 2 …

We study (2, 2) supersymmetric field theories on two-dimensional worldsheet with
boundaries. We determine D-branes (boundary conditions and boundary interactions) that …

We review recent developments (up to January 2004) of the Liouville field theory and its
matrix model dual. This review consists of two parts. In part I, we review the bosonic Liouville …

A bstract We construct examples of non-invertible global symmetries in two-dimensional
superconformal field theories described by sigma models into Calabi-Yau target spaces. Our …

We review the recent developments in our understanding of non-BPS states and branes in
string theory. The topics include 1) construction of unstable non-BPS D-branes in type IIA …

A bstract We use string field theory to fix the normalization of the D-instanton corrections to
the superpotential involving the moduli fields of type II string theory compactified on an …

We show that boundary conditions in topological open string theory on Calabi–Yau CY
manifolds are objects in the derived category of coherent sheaves, as foreseen in the …

S-duality symmetry of type IIB string theory predicts the existence of a stable non-BPS state
on an orbifold five plane of the type IIB theory if the orbifold group is generated by the …