Journal of High Energy Physics

, 2014:71 | Cite as

Sequestered de Sitter string scenarios: soft-terms

  • Luis Aparicio
  • Michele Cicoli
  • Sven Krippendorf
  • Anshuman Maharana
  • Francesco Muia
  • Fernando Quevedo
Open Access
Regular Article - Theoretical Physics

Abstract

We analyse soft supersymmetry breaking in type IIB de Sitter string vacua after moduli stabilisation, focussing on models in which the Standard Model is sequestered from the supersymmetry breaking sources and the spectrum of soft-terms is hierarchically smaller than the gravitino mass m3/2. Due to this feature, these models are compatible with gauge coupling unification and TeV scale supersymmetry with no cosmological moduli problem. We determine the influence on soft-terms of concrete realisations of de Sitter vacua constructed from supersymmetric effective actions. One of these scenarios provides the first study of soft-terms for consistent string models embedded in a compact Calabi-Yau manifold with all moduli stabilised. Depending on the moduli dependence of the Kähler metric for matter fields and on the mechanism responsible to obtain a de Sitter vacuum, we find two scenarios for phenomenology: (i) a split-supersymmetry scenario where gaugino masses are suppressed with respect to scalar masses: M1/2m3/2ϵm0m3/2\( \sqrt{\epsilon } \)m3/2 for ϵm3/2/MP ≪ 1; (ii) a typical MSSM scenario where all soft-terms are of the same order: M1/2m0m3/2ϵm3/2. Background fluxes determine the numerical coefficients of the soft-terms allowing for small variations of parameters as is necessary to confront data and to interpolate between different scenarios. We comment on different stringy origins of the μ-term and potential sources of desequestering.

Keywords

Strings and branes phenomenology 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2014

Authors and Affiliations

  • Luis Aparicio
    • 1
  • Michele Cicoli
    • 1
    • 2
    • 3
  • Sven Krippendorf
    • 4
  • Anshuman Maharana
    • 5
  • Francesco Muia
    • 2
    • 3
  • Fernando Quevedo
    • 1
    • 6
  1. 1.ICTPTriesteItaly
  2. 2.Dipartimento di Fisica e AstronomiaUniversità di BolognaBolognaItaly
  3. 3.INFN, Sezione di BolognaBolognaItaly
  4. 4.Bethe Center for Theoretical Physics and Physikalisches Institut der Universität BonnBonnGermany
  5. 5.Harish Chandra Research InstituteAllahabadIndia
  6. 6.DAMTP, Centre for Mathematical SciencesCambridgeU.K.

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