Browsing by Author "Vafa, Cumrun"

Now showing items 1-14 of 14

    • 4d Spectra from BPS Quiver Dualities 

      Espahbodi, Sam (2013-09-26)
      We attack the question of BPS occupancy in a wide class of 4d N = 2 quantum field theories. We first review the Seiberg-Witten approach to finding the low energy Wilsonian effective action actions of such theories. In ...

    • Brane Constructions and BPS Spectra 

      Rastogi, Ashwin (2013-10-07)
      The object of this work is to exploit various constructions of string theory and M-theory to yield new insights into supersymmetric theories in both four and three dimensions. In 4d, we extend work on Seiberg-Witten theory ...

    • Cascading to the MSSM 

      Heckman, Jonathan; Vafa, C.; Verlinde, Herman; Wijnholt, Martijn (Springer Verlag, 2008)
      The MSSM can arise as an orientifold of a pyramid-like quiver in the context of intersecting D-branes. Here we consider quiver realizations of the MSSM which can emerge at the bottom of a duality cascade. We classify all ...

    • Extended Supersymmetric Moduli Space and a SUSY/Non-SUSY Duality 

      Aganagic, Mina; Beem, Christopher; Seo, Jihye; Vafa, C. (Elsevier BV * North-Holland, 2009)
      We study \(\mathcal{N}\)=1 supersymmetric U(N) gauge theories coupled to an adjoint chiral field with superpotential. We consider the full supersymmetric moduli space of these theories obtained by adding all allowed chiral ...

    • F-theory and Neutrinos: Kaluza-Klein Dilution of Flavor Hierarchy 

      Bouchard, Vincent; Heckman, Jonathan; Seo, Jihye; Vafa, C. (Springer Verlag, 2010)
      We study minimal implementations of Majorana and Dirac neutrino scenarios in F-theory GUT models. In both cases the mass scale of the neutrinos \(m_{\nu} \sim M_{weak}^2/\land_{UV}\) arises from integrating out Kaluza-Klein ...

    • F-theory, GUTs, and the Weak Scale 

      Heckman, Jonathan; Vafa, C. (Springer Verlag, 2009)
      In this paper we study a deformation of gauge mediated supersymmetry breaking in a class of local F-theory GUT models where the scale of supersymmetry breaking determines the value of the mu term. Geometrically correlating ...

    • Non-Perturbative Topological Strings and Conformal Blocks 

      Cheng, Miranda Chih-Ning; Dijkgraaf, Robbert; Vafa, C. (Springer Verlag, 2011)
      We give a non-perturbative completion of a class of closed topological string theories in terms of building blocks of dual open strings. In the specific case where the open string is given by a matrix model these blocks ...

    • Non-Supersymmetric Black Holes and Topological Strings 

      Saraikin, Kirill; Vafa, C. (Institute of Physics, 2008)
      We study non-supersymmetric, extremal 4 dimensional black holes which arise upon compactification of type II superstrings on Calabi-Yau threefolds. We propose a generalization of the OSV conjecture for higher derivative ...

    • Self-Dual Strings of Six-Dimensional SCFTs 

      Lockhart, Guglielmo Paul (2015-05-13)
      In this thesis we aim to characterize the self-dual strings of six-dimensional superconformal field theories (SCFTs) and develop a variety of techniques to compute their elliptic genera, which provide information about ...

    • Supersymmetric Gauge Theories, Intersecting Branes and Free Fermions 

      Dijkgraaf, Robbert; Hollands, Lotte; Sulkowski, Piotr; Vafa, C. (American Physical Society, 2008)
      We show that various holomorphic quantities in supersymmetric gauge theories can be conveniently computed by configurations of D4-branes and D6-branes. These D-branes intersect along a Riemann surface that is described by ...

    • Supersymmetric Spectroscopy 

      Cordova, Clay Alexander (2012-08-17)
      We explore supersymmetric quantum field theories in three and four dimensions via an analysis of their BPS spectrum. In four dimensions, we develop the theory of BPS quivers which provides a simple picture of BPS states ...

    • T-Branes and Monodromy 

      Cecotti, Sergio; Cordova, Clay Alexander; Heckman, Jonathan; Vafa, C. (Springer Verlag, 2011)
      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. ...

    • Towards a Worldsheet Derivation of the Maldacena Conjecture 

      Berkovits, Nathan; Vafa, C. (Springer Verlag, 2008)
      A U(2,2|4)-invariant A-model constructed from fermionic superfields has recently been proposed as a sigma model for the superstring on \(AdS_5 \times S^5\). After explaining the relation of this A-model with the pure spinor ...

    • Wall Crossing and M-theory 

      Aganagic, Mina; Ooguri, Hirosi; Vafa, C.; Yamazaki, Masahito (European Mathematical Society, 2011)
      We study BPS bound states of D0 and D2 branes on a single D6 brane wrapping a Calabi-Yau 3-fold X. When X has no compact 4-cyles, the BPS bound states are organized into a free field Fock space, whose generators correspond ...