Black lenses in string theory

We present a new supersymmetric, asymptotically flat, black hole solution to five-dimensional U(1)(3) supergravity which is regular on and outside an event horizon of lens space topology L(2, 1). The solution has seven independent parameters and uplifts to a family of 1/8-supersymmetric D1-D5-P black brane solutions to type IIB supergravity. The decoupling limit is asymptotically AdS(3) x S-3 x T-4, with a near-horizon geometry that is a twisted product of the near-horizon geometry of the extremal Banados-Teitelboim-Zanelli black hole and L(2, 1) x T-4, although it is not (locally) a product space in the bulk. We show that the decoupling limit of a special case of the black lens is related to that of a black ring by spectral flow, thereby supplying an account of its entropy. Analogous solutions of U(1)(N) supergravity are also presented.