Claudio A. Scrucca

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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 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)
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)
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)
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)
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)
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)