Perturbation of Massive Scalar Field in Three-Dimensional Spherical de Sitter Space-time

We obtain exact expressions of quasi-normal modes in three-dimensional spherical de Sitter space-time. Exact agreement is found between the quasi-normal frequencies and the location of poles of the retarded correlation function of the corresponding perturbations in the dual conformal field theory. Our results exhibits the Sitter/conformal-field theory correspondence in three-dimensional spherical spacetime.