19
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Spacetime Instanton Corrections in 4D String Vacua - The Seesaw Mechanism for D-Brane Models

      Preprint
      , ,

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          We systematically investigate instanton corrections from wrapped Euclidean D-branes to the matter field superpotential of various classes of N=1 supersymmetric D-brane models in four dimensions. Both gauge invariance and the counting of fermionic zero modes provide strong constraints on the allowed non-perturbative superpotential couplings. We outline how the complete instanton computation boils down to the computation of open string disc diagrams for boundary changing operators multiplied by a one-loop vacuum diagram. For concreteness we focus on E2-instanton effects in Type IIA vacua with intersecting D6-branes, however the same structure emerges for Type IIB and heterotic vacua. The instantons wrapping rigid cycles can potentially destabilise the vacuum or generate perturbatively absent matter couplings such as proton decay operators, mu-parameter or right-handed neutrino Majorana mass terms. The latter allow the realization of the seesaw mechanism for MSSM-like intersecting D-brane models.

          Related collections

          Author and article information

          Journal
          27 September 2006
          2007-03-06
          Article
          10.1016/j.nuclphysb.2007.02.016
          hep-th/0609191
          d4fcf658-4c3d-4d15-91f7-04328651a8bc
          History
          Custom metadata
          Nucl.Phys.B771:113-142,2007
          40 pages, 3 tables, 7 figures; v2: typos corrected, references added; v3: minor sign adjustments, some comments added; v4: published version
          hep-th hep-ph

          Comments

          Comment on this article