Simple holographic duals to boundary CFTs

By relaxing the regularity conditions imposed in arXiv:1107.1722 on half-BPS solutions to six-dimensional Type 4b supergravity, we enlarge the space of solutions to include two new half-BPS configurations, which we refer to as the AdS2-cap and the AdS2-funnel. We give evidence that the AdS2-cap and AdS2-funnel can be interpreted as fully back-reacted brane solutions with respectively AdS2 and AdS2 × S2 world volumes. AdS2-cap and AdS2-funnel solutions with a single asymptotic AdS3 × S3 region are constructed analytically. We argue that AdS2-cap solutions provide simple examples of holographic duals to boundary CFTs in two dimensions and present calculations of their holographic boundary entropy to support the BCFT dual picture.