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We show that certain type II string amplitudes at genus g are given by the topologi-cal partition function F g discussed recently by Bershadsky, Cecotti, Ooguri and Vafa. These amplitudes give rise… (More)

We study the plane wave limit of AdS5 × S/Z2 which arises as the near horizon geometry of D3-branes at an orientifold 7-plane in type I’ theory. We analyze string theory in the resulting plane wave… (More)

We study structure constants of gauge invariant operators in planar N = 4 Yang-Mills at one loop with the motivation of determining features of the string dual of weak coupling Yang-Mills. We derive… (More)

In the context of the AdS/CFT correspondence, we perform a direct computation in AdS5 supergravity of the trace anomaly of a d = 4, N = 2 SCFT. We find agreement with the field theory result up to… (More)

We study bound states of D-p-branes and D-(p + 2)-branes. By switching on a large magnetic field F on the (p + 2) brane, the problem is shown to admit a perturbative analysis in an expansion in… (More)

We study gravitational corrections to the effective superpotential in theories with a single adjoint chiral multiplet, using the generalized Konishi anomaly and the gravitationally deformed chiral… (More)

We discuss the prepotential describing the effective field theory of N=2 heterotic superstring models. At the one loop-level the prepotential develops logarithmic singularities due to the appearance… (More)

We study the duality between IIB string theory on a pp-wave background, arising as a Penrose limit of the AdS3 × S3 × M , where M is T 4 (or K3), and the 2D CFT which is given by the N = (4, 4)… (More)

Abstract: We study AdS3 supersymmetric vacua in N = 4 and N = 8, three dimensional gauged supergravities, with scalar manifolds ( SO(4,4) SO(4)×SO(4) ) and SO(8,8) SO(8)×SO(8) , non-semisimple… (More)

We study a class of exact supersymmetric solutions of type IIB Supergravity. They have an SO(4) x SU(2) x U(1) isometry and preserve generically 4 of the 32 supersymmetries of the theory.… (More)