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- 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)

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 factorizing in the RR channel various one-loop amplitues. In particular, we find that Op-planes present gravitational anomalous couplings involving the Hirzebruch polynomial L̂, similarly to the roof genus Â encoding… (More)

We derive the general form of the anomaly for chiral spinors and self-dual antisymmetric tensors living on D-brane and O-plane intersections, using both path-integral and index theorem methods. We then show that the anomalous couplings to RR forms of D-branes and O-planes in a general background are precisely those required to cancel these anomalies through… (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)

- Marta Gómez–Reino, Claudio A. Scrucca
- 2008

We study the conditions under which a generic supergravity model involving chiral and vector multiplets can admit viable metastable vacua with spontaneously broken supersymmetry and realistic cosmological constant. To do so, we impose that on the vacuum the scalar potential and all its first derivatives vanish, and derive a necessary condition for the… (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)

- Laura Covi, Marta Gomez-Reino, Christian Gross, Jan Louis, Gonzalo A. Palma, Claudio A. Scrucca
- 2008

Theory Group, Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany Institute of Theoretical Physics, Warsaw University, ul. Hoza 69, 00-681 Warsaw, Poland Theory Division, Physics Department, CERN, CH-1211 Geneva 23, Switzerland II. Institut für Theoretische Physik, Universität Hamburg, D-22761 Hamburg, Germany Zentrum für Mathematische Physik,… (More)

- Laura Covi, Marta Gomez-Reino, Christian Gross, Jan Louis, Gonzalo A. Palma, Claudio A. Scrucca
- 2008

Theory Group, Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg, Germany Theory Division, Physics Department, CERN, CH-1211 Geneva 23, Switzerland II. Institut für Theoretische Physik, Universität Hamburg, D-22761 Hamburg, Germany Zentrum für Mathematische Physik, Universität Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany Inst. de Th. des Phén.… (More)

- Riccardo Rattazzi, Claudio A. Scrucca, Alessandro Strumia
- 2003

We extend the results of Mirabelli and Peskin to supergravity. We study the compactification on S/Z2 of Zucker’s off-shell formulation of 5D supergravity and its coupling to matter at the fixed points. We clarify some issues related to the off-shell description of supersymmetry breaking à la Scherk–Schwarz (here employed only as a technical tool) discussing… (More)

- T. Grégoire, R. Rattazzi, C. A. Scrucca
- 2005

We revisit the issue of gravitational contributions to soft masses in fivedimensional sequestered models. We point out that, unlike for the case of F -type supersymmetry breaking, for D-type breaking these effects generically give positive soft masses squared for the sfermions. This drastically improves model building. We discuss the phenomenological… (More)