4 papers
Fractional branes on ALE orbifolds
M. Billo', L. Gallot, A. Liccardo
We derive the classical type IIB supergravity solution describing fractional D3-branes transverse to a C^2/Gamma orbifold singularity, for Gamma any Kleinian ADE subgroup. This sol…
Anomalous couplings of type 0 D-branes
Marco Billo', Ben Craps, Frederik Roose
Closed type 0 string theories and their D-branes are introduced. The full Wess-Zumino action of these D-branes is derived. The analogy with type II is emphasized throughout the arg…
Anomalous couplings of non-BPS D-branes
Marco Billo', Ben Craps, Frederik Roose
Non-BPS type II D-branes couple to R-R potentials via an action that, upon tachyon condensation, gives rise to the Wess-Zumino action of BPS D-branes.
R-symmetry of heterotic N=2 supergravities
M. Billo'
The topological twist of N=2, D=4 matter-coupled supergravities requires a suitable R-symmetry. This symmetry is realised in the effective supergravities arising at tree level from…