We give a comprehensive review of recent developments on using the pure spinor
formalism to compute massless superstring scattering amplitudes at tree level. The main …

In 1938, Stueckelberg introduced a scalar field which makes an Abelian gauge theory
massive but preserves gauge invariance. The Stueckelberg mechanism is the introduction of …

Twenty-five years ago, Michael Green, John Schwarz, and Edward Witten wrote two
volumes on string theory. Published during a period of rapid progress in this subject, these …

We provide an overview of the string landscape and the Swampland program. Our review of
the string landscape covers the worldsheet and spacetime perspectives, including vacua …

String theory is one of the most exciting and challenging areas of modern theoretical
physics. This book guides the reader from the basics of string theory to recent developments …

A matrix model which has the manifest ten-dimensional N= 2 super Poincaré invariance is
proposed. Interactions between BPS-saturated states are analyzed to show that the …

We study the quantum-mechanical properties of a supermembrane and examine the nature
of its ground state. A supersymmetric gauge theory of area-preserving transformations …

We construct the covariant κ-symmetric superstring action for a type IIB superstring on
AdS5⊕ S5 background. The action is defined as a 2d σ-model on the coset superspace SU …

We present a covariant background field method for quantum string dynamics. It is based on
the effective action Γ for fields corresponding to different string modes. A formalism is …

Non-perturbative instanton corrections to the moduli space geometry of type IIA string theory
compactified on a Calabi-Yau space are derived and found to contain order e− 1/gs …