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Browsing by Author "Vafa, Cumrun"

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Browsing by Author "Vafa, Cumrun"

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  • Classification of complete N=2 supersymmetric theories in 4 dimensions
    Cecotti, Sergio; Vafa, Cumrun (SISSA, 2011-03-30)
    We define the notion of a complete N=2 supersymmetric theory in 4 dimensions as a UV complete theory for which all the BPS central charges can be arbitrarily varied as we vary its Coulomb branch parameters, masses, ...
  • Kodaira-Spencer Theory of Gravity and Exact Results for Quantum String Amplitudes
    Bershadsky, M.; Cecotti, Sergio; Ooguri, H.; Vafa, Cumrun (Springer, 1994-10)
    We develop techniques to compute higher loop string amplitudes for twisted $N=2$ theories with $\hat c=3$ (i.e. the critical case). An important ingredient is the discovery of an anomaly at every genus in decoupling of ...
  • T-branes and monodromy
    Cecotti, Sergio; Cordova, Clay; Heckman, Johnatan J.; Vafa, Cumrun (Springer, 2011-07)
    We introduce T-branes, or "triangular branes," which are novel non-abelian bound states of branes characterized by the condition that on some loci, their matrix of normal deformations, or Higgs field, is upper triangular. ...