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We study anomalous Wess-Zumino couplings of D-branes and O-planes in a general background and derive them from a direct string computation by fac-torizing in the RR channel various one-loop amplitues. In particular, we find that Op-planes present gravitational anomalous couplings involving the Hirze-bruch polynomiaî L, similarly to the roof genusˆA encoding… (More)

- M. Gómez–Reino, C. A. Scrucca
- 2008

We perform a general study about the existence of non-supersymmetric minima with vanishing cosmological constant in supergravity models involving only chiral superfields. We study the conditions under which the matrix of second derivatives of the scalar potential is positive definite, and show that there exist very simple and strong necessary conditions for… (More)

- M. Gómez–Reino, C. A. Scrucca
- 2006

We further develop on the study of the conditions for the existence of locally stable non-supersymmetric vacua with vanishing cosmological constant in supergravity models involving only chiral superfields. Starting from the two necessary conditions for flatness and stability derived in a previous paper (which involve the Kähler metric and its Riemann tensor… (More)

- Faheem Hussain, Roberto Iengo, Carmen Núñez, Claudio A. Scrucca
- 1997

We use the boundary state formalism to study the interaction of two moving identical D-branes in the Type II superstring theory compactified on orb-ifolds. By computing the velocity dependence of the amplitude in the limit of large separation we can identify the nature of the different forces between the branes. In particular, in the Z 3 orbifold case we… (More)

We study higher-dimensional non-supersymmetric orbifold models where the Higgs field is identified with some internal component of a gauge field. We address two important and related issues that constitute severe obstacles towards model building within this type of constructions: the possibilities of achieving satisfactory Yukawa couplings and Higgs… (More)

We give an overview of the issue of anomalies in field theories with extra dimensions. We start by reviewing in a pedagogical way the computation of the standard perturbative gauge and gravitational anomalies on non-compact spaces, using Fujikawa's approach and functional integral methods, and discuss the available mechanisms for their cancellation. We then… (More)

- Matteo Bertolini, Pietro Frè, Roberto Iengo, Claudio A. Scrucca
- 1998

We show how an extremal Reissner–Nordström black hole can be obtained by wrapping a dyonic D3–brane on a Calabi–Yau manifold. In the orbifold limit T 6 /Z Z 3 , we explicitly show the correspondence between the solution of the supergravity equations of motion and the D–brane boundary state description of such a black hole.

- C. A. Scrucca, M. Serone, L. Silvestrini, A. Wulzer
- 2003

Six-dimensional orbifold models where the Higgs field is identified with some internal component of a gauge field are considered. We classify all possible T 2 /Z N orbifold constructions based on a SU (3) electroweak gauge symmetry. Depending on the orbifold twist, models with two, one or zero Higgs doublets can be obtained. Models with one Higgs doublet… (More)

We study spin interactions between two moving D-branes using the Green-Schwarz formalism of boundary states. We focus our attention on the leading terms for small velocities v, of the form v 4−n /r 7−p+n (v 2−n /r 3−p+n) for p-p (p-p+4) systems, with 16 (8) supercharges. In analogy with the standard G-S computation of massless four-point one-loop amplitudes… (More)

- Faheem Hussain, Roberto Iengo, Carmen Núñez, Claudio A. Scrucca
- 1997

We discuss various D-brane configurations in 4-dimensional orbifold compactifications of type II superstring theory which are point-like 0-branes from the 4-dimensional space-time point of view. We analyze their interactions and compute the amplitude for the emission of a massless NSNS boson from them, in the case where the branes have a non vanishing… (More)