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- Robert G Leigh, Matthew J Strassler
- 1995

We show that manifolds of fixed points, which are generated by exactly marginal operators, are common in N=1 supersymmetric gauge theory. We present a unified and simple prescription for identifying these operators, using tools similar to those employed in two-dimensional N=2 supersymmetry. In particular we rely on the work of Shifman and Vainshtein… (More)

- Micha Berkooz, Michael R Douglas, Robert G Leigh
- 1996

We show that configurations of multiple D-branes related by SU (N) rotations will preserve unbroken supersymmetry. This includes cases in which two D-branes are related by a rotation of arbitrarily small angle, and we discuss some of the physics of this. In particular, we discuss a way of obtaining 4D chiral fermions on the intersection of D-branes. We also… (More)

- David Berenstein, Vishnu Jejjala, Robert G Leigh
- 2000

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… (More)

- David Berenstein, Robert G Leigh
- 2000

We analyse D-branes on orbifolds with discrete torsion, extending earlier results. We analyze certain Abelian orbifolds of the type C 3 /Γ, where Γ is given by Z m × Z n , for the most general choice of discrete torsion parameter. By comparing with the AdS/CFT correspondence, we can consider different geometries which give rise to the same physics. This… (More)

- David Kutasov, Finn Larsen, Robert G Leigh
- 1998

We discuss string propagation in the near-horizon geometry generated by Neveu-Schwarz fivebranes, Kaluza-Klein monopoles and fundamental strings. When the fivebranes and KK monopoles are wrapped around a compact four-manifold M, the geometry is AdS 3 × S 3 /Z Z N × M and the spacetime dynamics is expected to correspond to a local two dimensional conformal… (More)

- Micha Berkooz, Robert G Leigh
- 1996

We consider the propagation of Type I open superstrings on orb-ifolds with four non-compact dimensions and N = 1 supersymmetry. In this paper, we concentrate on a non-trivial Z Z 2 × Z Z 2 example. We show that consistency conditions, arising from tadpole cancellation and algebraic sources, require the existence of three sets of Dirichlet 5-branes. We… (More)

- Vijay Balasubramanian, Finn Larsen, David Rittenhouse Laboratories, Robert G Leigh
- 1998

We construct the most general supersymmetric configuration of D2-branes and D6-branes on a 6-torus. It contains arbitrary numbers of branes at relative U (3) angles. The corresponding supergravity solutions are constructed and expressed in a remarkably simple form, using the complex geometry of the compact space. The spacetime supersymmetry of the… (More)

- Robert G Leigh, Anastasios C Petkou
- 2003

We show that there is a natural action of SL(2, Z) on the two-point functions of the energy momentum tensor and of higher-spin conserved currents in three-dimensional CFTs. The dynamics behind the S-operation of SL(2, Z) is that of an irrelevant current-current deformation and we point out its similarity to the dynamics of a wide class of three-dimensional… (More)

- Robert G Leigh, Anastasios C Petkou
- 2008

We discuss the implementation of electric-magnetic duality transformations in four-dimensional gravity linearized around Minkowski or (A)dS 4 backgrounds. In the presence of a cosmological constant duality generically modifies the Hamiltonian, nevertheless the bulk dynamics is unchanged. We pay particular attention to the boundary terms generated by the… (More)

- David Berenstein, Robert G Leigh
- 2008

We construct string target spacetimes with AdS 3 × X geometry, which have an N = 2 spacetime superconformal algebra. X is found to be a U (1) fibration over a manifold which is a target for an N = 2 worldsheet conformal field theory. We emphasize theories with free field realizations where in principle it is possible to compute the full one-particle string… (More)