Hypersurfaces in hyperbolic space with support function

Based on [19], we develop a global correspondence between immersed hypersurfaces phi : M-n -> Hn+1 satisfying an exterior horosphere condition, also called here horospherically concave hypersurfaces, and complete conformal metrics e(2 rho) g(Sn), on domains Omega in the boundary S-n at infinity of Hn+1 where rho is the horospherical support function, partial derivative(infinity)phi(M-n) = partial derivative Omega and Omega is the image of the Gauss map G : M-n -> S-n To do so we first establish results on when the Gauss map G : M-n -> S-n is injective. We also discuss when an immersed horospherically concave hypersurface can be unfolded along the normal flow into an embedded one. These results allow us to establish general Alexandrov reflection principles for elliptic problems of both immersed hypersurfaces in Hn+1 and conformal metrics on domains in S-n. Consequently, we are able to obtain, for instance, a strong Bernstein theorem for a complete, immersed, horospherically concave hypersurface in Hn+1 of constant mean curvature. (C) 2015 Elsevier Inc. All rights reserved.