Heterotic string plus five-brane systems with asymptotic ads3

Abstract

We present NS1+NS5-brane solutions of heterotic supergravity on curved geometries. They interpolate between a near horizon AdS3 × Xk × T7-k region and R1,11,1 × c(Xκ) × T7-κ, where Xκ (with κ = 3, 5, 6, 7) is a k-dimensional geometric Killing spinor manifold, c(Xκ) its Ricciflat cone and T7-κ a (7-k)-torus. The solutions require first-order α'- corrections to the field equations, and special point-like instantons play an important role, whose singular support is a calibrated submanifold wrapped by the NS5-brane. It is also possible to add a gauge anti-fivebrane. We determine the super isometries of the near horizon geometry, which are supposed to appear as symmetries of the holographically dual two-dimensional conformal field theory. © 2013 International Press.