Obstructions and lines of marginal stability from the world-sheet

Ilka Brunner, Matthias R. Gaberdiel, Stefan Hohenegger, Christoph A. Keller

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The behaviour of supersymmetric D-branes under deformations of the closed string background is studied using world-sheet methods. We explain how lines of marginal stability and obstructions arise from this point of view. We also show why = 2 B-type branes may be obstructed against (cc) perturbations, but why such obstructions do not occur for = 4 superconformal branes at c = 6, i.e. for half-supersymmetric D-branes on K3. Our analysis is based on a field theory approach in superspace, as well as on techniques from perturbed conformal field theory.

Original languageEnglish (US)
Article number007
JournalJournal of High Energy Physics
Issue number5
StatePublished - 2009


  • Conformal and W symmetry
  • D-branes
  • Extended supersymmetry
  • Field theories in lower dimensions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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