Fourier and Gegenbauer expansions for a fundamental solution of the Laplacian in the hyperboloid model of hyperbolic geometry

H S Cohl, E G Kalnins
2012 Journal of Physics A: Mathematical and Theoretical  
Due to the isotropy d-dimensional hyperbolic space, there exist a spherically symmetric fundamental solution for its corresponding Laplace-Beltrami operator. On the R-radius hyperboloid model of d-dimensional hyperbolic geometry with R>0 and d> 2, we compute azimuthal Fourier expansions for a fundamental solution of Laplace's equation. For d> 2, we compute a Gegenbauer polynomial expansion in geodesic polar coordinates for a fundamental solution of Laplace's equation on this negative-constant
more » ... ctional curvature Riemannian manifold. In three-dimensions, an addition theorem for the azimuthal Fourier coefficients of a fundamental solution for Laplace's equation is obtained through comparison with its corresponding Gegenbauer expansion.
doi:10.1088/1751-8113/45/14/145206 fatcat:gqlrprtcl5grnepgr35qbv547q