165 research outputs found

    Supersymmetry breaking in M-theory and quantization rules

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    We analyze in detail supersymmetry breaking by compactification of the fifth dimension in M-theory in the compactification pattern 11d→5d→4d11d \to 5d \to 4d and find that a superpotential is generated for the complex fields coming from 5d5d hypermultiplets, namely the dilaton SS and the complex structure moduli. Using general arguments it is shown that these fields are always stabilized such that they don't contribute to supersymmetry breaking, which is completely saturated by the K\"ahler moduli coming from vector multiplets. It is shown that this mechanism is the strong-coupling analog of the Rohm-Witten quantization of the antisymmetric tensor field strength of string theories. The effect of a gaugino condensate on one of the boundaries is also considered.Comment: 16 pages, LaTex, no figure

    Three-form multiplet and Inflation

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    Most successful models of inflation in supergravity have a shift symmetry for the inflaton and contain a stabilizer field coupled to the inflaton in a particular way. We argue that the natural interpretation of the stabilizer, from the viewpoint of the shift symmetry, is a three-form multiplet. Its coupling to the inflaton is uniquely determined by the shift symmetry and the invariance under three-form gauge transformations and has a natural string theory interpretation.Comment: 15 pages, references adde

    General soft terms from Supergravity including D-terms

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    We derive general expressions for soft terms in supergravity where D-terms contribute significantly to the supersymmetry breaking. Such D-terms can produce large splitting between scalar and fermionic partners in the spectrum. By requiring that supersymmetry breaking sets the cosmological constant to zero, we then parameterize the soft terms when D-terms dominate over F-terms or are comparable to them. We present an application of our results to the split supersymmetry scenario and briefly address the issue of moduli stabilisation.Comment: 6 Pages, no figures. To appear in proceedings of the XXXXth Rencontres de Moriond "Electroweak Interactions and Unified Theories", La Thuile, Italy, March 5-12, 2005; V2 Typos in eq.(9) corrected and other improvement

    Low Scale Supersymmetry Breaking and its LHC Signatures

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    We study the most general extension of the MSSM Lagrangian that includes scenarios in which supersymmetry is spontaneously broken at a low scale f. The spurion that parametrizes supersymmetry breaking in the MSSM is promoted to a dynamical superfield involving the goldstino, with (and without) its scalar superpartner, the sgoldstino. The low energy effective Lagrangian is written as an expansion in terms of m_{SUSY}/sqrt{f}, where m_{SUSY} is the induced supersymmetry breaking scale, and contains, in addition to the usual MSSM Lagrangian with the soft terms, couplings involving the component fields of the goldstino superfield and the MSSM fields. This Lagrangian can provide significant corrections to the usual couplings in the Standard Model and the MSSM. We study how these new corrections affect the Higgs couplings to gauge bosons and fermions, and how LHC bounds can be used in order to constrain f. We also discuss that, from the effective field theory point of view, the couplings of the goldstino interactions are not determined by any symmetry, and their usual simple relation to the soft terms is corrected by higher-dimensional operators.Comment: 46 pages, 3 figure

    The Case for an EeV Gravitino

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    We consider the possibility that supersymmetry is broken above the inflationary mass scale and that the only "low" energy remnant of supersymmetry is the gravitino with mass of order the EeV scale. The gravitino in this class of models becomes a candidate for the dark matter of the Universe. To avoid the over-production of gravitinos from the decays of the next-to-lightest supersymmetric particle we argue that the supersymmetric spectrum must lie above the inflationary mass scale (MSUSY>10−5MP∼1013M_{\rm SUSY} > 10^{-5} M_{\rm P} \sim 10^{13} GeV). Since m3/2≃MSUSY2/MPm_{3/2} \simeq M_{\rm SUSY}^2/M_{\rm P}, we expect m3/2≳0.2m_{3/2} \gtrsim 0.2 EeV. Cosmological constraints then predict a relatively large reheating temperature between 101010^{10} and 101210^{12} GeV.Comment: 6 pages, 1 figure. Dedicated to the memory of Pierre Binetru
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