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- Paolo Di Vecchia, Marialuisa Frau, A. Lerda, Raffaele Marotta, Igor Pesando
- 2000

We study the classical geometry associated to fractional D3-branes of type IIB string theory on IR/Z2 which provide the gravitational dual for N = 2 super Yang-Mills theory in four dimensions. As one… (More)

- Marco Billó, Paolo Di Vecchia, +4 authors Stefano Sciuto
- 1998

Using the boundary state formalism, we perform a microscopic string analysis of the interaction between two D-branes and provide a local interpretation for the R-R force in the D0-D8 brane system. To… (More)

We study the D3/D(−1) brane system and show how to compute instanton corrections to correlation functions of gauge theories in four dimensions using open string techniques. In particular we show that… (More)

- Marco Billó, Igor Pesando
- 2002

We construct the boundary states preserving half the global supersymmetries in string theory propagating on a Hpp background. e-mail:billo@to.infn.it e-mail:ipesando@to.infn.it

- Marco Billó, Frederik Denef, +4 authors Daniela Zanon
- 1998

The limiting procedure of special Kähler manifolds to their rigid limit is studied for moduli spaces of Calabi-Yau manifolds in the neighbourhood of certain singularities. In two examples we consider… (More)

- Paolo Di Vecchiay, Marialuisa Frau, Igor Pesando, Rodolfo Veneziano Russo
- 2007

We show that the boundary state description of a Dp-brane is strictly related to the corresponding classical solution of the low-energy string eeective action. By projecting the boundary state on the… (More)

- Pietro Fré, Luciano Girardello, Igor Pesando, Mario Trigiante
- 1996

Generic partial supersymmetry breaking of N = 2 supergravity with zero vacuum energy and with surviving unbroken arbitrary gauge groups is exhibited. Specific examples are given. ∗ Supported in part… (More)

We develop an operator formalism to compute scattering amplitudes of arbitrary bosonic string states in the background of many D-branes. Specifically, we construct a suitable boundary state which we… (More)

- Marco Billó, Marialuisa Frau, Igor Pesando, Alberto Lerda
- 2004

We derive the four dimensional N = 1/2 super Yang-Mills theory from tree-level computations in RNS open string theory with insertions of closed string Ramond-Ramond vertices. We also study instanton… (More)

- Marco Billó, Marialuisa Frau, Laurent Gallot, Alberto Lerda, Igor Pesando
- 2008

We consider the D7/D(–1) system in Type I as a prototypical “exotic” brane instanton. With respect to systems such as the D3/D(–1) ones, which correspond to gauge instantons in four dimensions,… (More)