Non-BPS attractors in 5d and 6d extended supergravity

We connect the attractor equations of a certain class of N = 2, d = 5 supergravities with their (1, 0), d = 6 counterparts, by relating the moduli space of non-BPS d = 5 black hole/black string attractors; to the moduli space of extremal dyonic black string d = 6 non-BPS attractors. For d = 5 real special symmetric spaces and for N = 4, 6, 8 theories, we explicitly compute the flat directions of the black object potential corresponding to vanishing eigenvalues of its Hessian matrix. In the case N = 4, we study the relation to the (2, 0), d = 6 theory. We finally describe the embedding of the N = 2, d = 5 magic models in N = 8, d = 5 supergravity as well as the interconnection among the corresponding charge orbits. (c) 2007 Elsevier B.V. All rights reserved.