New couplings of six-dimensional supergravity

We describe the couplings of six-dimensional supergravity, which contain a self-dual tensor multiplet, to n(T) anti-self-dual tensor matter multiplets, n(v) vector multiplets and n(H) hypermultiplets. The scalar fields of the tensor multiplets form a coset SO(n(T), 1)/SO(n(T)), while the scalars in the hypermultiplets form quaternionic Kahler-symmetric spaces, the generic example being Sp(n(H), 1)/Sp(n(H)) circle times Sp(1). The gauging of the compact subgroup Sp(n(H)) circle times Sp(1) is also described. These results generalize previous ones in the literature on matter couplings of N = 1 supergravity in six dimensions. (C) 1997 Elsevier Science B.V.