20 papers
Open string topological amplitudes and gaugino masses
I. Antoniadis, K. S. Narain, T. R. Taylor
We discuss the moduli-dependent couplings of the higher derivative F-terms $(\Tr W^2)^{h-1}$, where is the gauge N=1 chiral superfield. They are determined by the genus zero to…
Non-Abelian Born-Infeld Action and Type I - Heterotic Duality (I): Heterotic F^6 Terms at Two Loops
S. Stieberger, T. R. Taylor
We study the two-loop F^6 interactions in SO(32) heterotic superstring theory in D=10. By using the generalized Riemann identity we are able to determine the single-trace part of t…
Renormalization of Boundary Fermions and World-Volume Potentials on D-branes
P. Khorsand, T. R. Taylor
We consider a sigma model formulation of open string theory with boundary fermions carrying Chan-Paton charges at the string ends. This formalism is particularly suitable for study…
Branes and Fluxes in D=5 Calabi-Yau Compactifications of M-Theory
M. Spalinski, T. R. Taylor
We discuss Poincare three-brane solutions in D=5 M-Theory compactifications on Calabi-Yau (CY) threefolds with G-fluxes. We show that the vector moduli freeze at an attractor point…
Duality in Superstring Compactifications with Magnetic Field Backgrounds
I. Antoniadis, E. Gava, K. S. Narain +1
Motivated by the work of Polchinski and Strominger on type IIA theory, where the effect of non-trivial field strengths for p-form potentials on a Calabi-Yau space was discussed, we…
Calculable e^{-1/λ} Effects
I. Antoniadis, B. Pioline, T. R. Taylor
We identify and evaluate a class of physical amplitudes in four-dimensional N=4 superstring theory, which receive, in the weak coupling limit, contributions of order e^{-1/λ}, wher…