Marginal and relevant deformations of N=4 field theories and non-commutative moduli spaces of vacua

David Berenstein, Vishnu Jejjala, Robert G. Leigh

Research output: Contribution to journalArticlepeer-review


We study marginal and relevant supersymmetric deformations of the N=4 super Yang-Mills theory in four dimensions. Our primary innovation is the interpretation of the moduli spaces of vacua of these theories as non-commutative spaces. The construction of these spaces relies on the representation theory of the related quantum algebras, which are obtained from F-term constraints. These field theories are dual to superstring theories propagating on deformations of the AdS5×S5 geometry. We study D-branes propagating in these vacua and introduce the appropriate notion of algebraic geometry for non-commutative spaces. The resulting moduli spaces of D-branes have several novel features. In particular, they may be interpreted as symmetric products of non-commutative spaces. We show how mirror symmetry between these deformed geometries and orbifold theories follows from T-duality. Many features of the dual closed string theory may be identified within the non-commutative algebra. In particular, we make progress towards understanding the K-theory necessary for backgrounds where the Neveu-Schwarz antisymmetric tensor of the string is turned on, and we shed light on some aspects of discrete anomalies based on the non-commutative geometry.

Original languageEnglish (US)
Pages (from-to)196-248
Number of pages53
JournalNuclear Physics B
Issue number1-2
StatePublished - Nov 20 2000


  • AdS/CFT
  • D-branes
  • K-theory
  • Non-commutative geometry

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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