ζ-function regularization of one-loop effective potentials in anti--de Sitter spacetime

We use the ζ-function technique to calculate the one-loop effective potential for a scalar field in anti--de Sitter (AdS) space. The ζ function is computed exactly on the four-dimensional hyperbolic space H4, the Euclidean section appropriate for AdS space. The structure of the ultraviolet divergences is shown to agree with previous calculations where Pauli-Villars or some version of dimensional regularization was used. The finite part of the effective potential is given explicitly by an integral over a variable related to the spectrum of the Laplace-Beltrami operator on H4