Holographic duals of boundary CFTs

New families of regular half-BPS solutions to 6-dimensional Type 4b supergravity with in tensor multiplets are constructed exactly. Their space-time consists of AdS(2) x S-2 warped over a Riemann surface with an arbitrary number of boundary components, and arbitrary genus. The solutions have an arbitrary number of asymptotic AdS(3) x S-3 regions. In addition to strictly single-valued solutions to the supergravity equations whose scalars live in the coset SO(5, m)/SO(5) x SO(m), we also construct stringy solutions whose scalar fields are single-valued up to transformations under the U-duality group SO(5, m; Z), and live in the coset SO(5, m; Z) \ SO(5, m)/SO(5) x SO(m). We argue that these Type 4b solutions are holographically dual to general classes of interface and boundary CFTs arising at the juncture of the end-points of 1+1-dimensional bulk CFTs. We evaluate their corresponding holographic entanglement and boundary entropy, and discuss their brane interpretation. We conjecture that the solutions for which Sigma has handles and multiple boundaries correspond to the near-horizon limit of half-BPS webs of dyonic strings and three-branes.