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Worldsheet approaches to D-branes on supersymmetric cycles

- S. Govindarajan, T. Jayaraman, Tapobrata Sarkar
- Physics
- 15 July 1999

We consider D-branes wrapped around supersymmetric cycles of Calabi–Yau manifolds from the viewpoint of N=2 Landau–Ginzburg models with boundary as well as by consideration of boundary states in the… Expand

On the Landau-Ginzburg description of boundary CFTs and special Lagrangian submanifolds

- S. Govindarajan, T. Jayaraman
- Physics, Mathematics
- 27 March 2000

We consider Landau-Ginzburg (LG) models with boundary conditions pre- serving A-type N = 2 supersymmetry. We show the equivalence of a linear class of boundary conditions in the LG model to a… Expand

D-branes on Calabi–Yau Manifolds and Superpotentials

- M. Douglas, S. Govindarajan, T. Jayaraman, A. Tomasiello
- Physics, Mathematics
- 19 March 2002

We show how to compute terms in an expansion of the world-volume superpotential for fairly general D-branes on the quintic Calabi-Yau using linear sigma model techniques, and show in examples that… Expand

Correlation functions for minimal models on the torus

- T. Jayaraman, K. Narain
- Physics
- 19 February 1990

A Coulomb gas approach to the construction of correlation functions for minimal models on the torus is presented. In particular the conformal blocks for the two-point function (φ12φ12) are discussed… Expand

Chiral Rings and Physical States in c < 1 String Theory

- S. Govindarajan, T. Jayaraman, V. John
- Physics
- 30 July 1992

Abstract We show how the double cohomology of the string and Felder BRST charges naturally leads to the ring structure of c x p ⋍ y p+1 for the (p + 1, p) model. We also study the states… Expand

Boundary Fermions, Coherent Sheaves and D-branes on Calabi-Yau manifolds

- S. Govindarajan, T. Jayaraman
- Physics
- 14 April 2001

Abstract We construct boundary conditions in the gauged linear sigma model for B-type D-branes on Calabi–Yau manifolds that correspond to coherent sheaves given by the cohomology of a monad. This… Expand

SU(2)-k {WZW} and $Z^-$k Parafermion Models on the Torus

- T. Jayaraman, K. Narain, M. H. Sarmadi
- Physics
- 22 October 1990

Abstract We study SU(2) k WZW and Z k parafermion models using a Coulomb-gas formulation related to that of Wakimoto and Zamolodchikov. We discuss the truncation of the Fock modules of the free… Expand

On D-branes from gauged linear sigma models

- S. Govindarajan, T. Jayaraman, Tapobrata Sarkar
- Physics
- 10 July 2000

Abstract We study both A-type and B-type D-branes in the gauged linear sigma model by considering worldsheets with boundary. The boundary conditions on the matter and vector multiplet fields are… Expand

Disc instantons in linear sigma models

- S. Govindarajan, T. Jayaraman, Tapobrata Sarkar
- Physics
- 31 August 2001

Abstract We construct a linear sigma model for open-strings ending on special Lagrangian cycles of a Calabi–Yau manifold. We illustrate the construction for the cases considered by Aganagic and Vafa… Expand

D-branes, exceptional sheaves and quivers on Calabi-Yau manifolds: From Mukai to McKay

- S. Govindarajan, T. Jayaraman
- Physics, Mathematics
- 23 October 2000

Abstract We present a method based on mutations of helices which leads to the construction (in the large-volume limit) of exceptional coherent sheaves associated with the (∑ala=0) orbits in Gepner… Expand

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