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Oct 4, 2011 at 17:50 comment added Aaron Hoffman Sorry. I meant (Dirichlet) eigenfunctions of the Laplacian on the ball. Take e.g. section 10.3 in Strauss.
Oct 4, 2011 at 16:43 comment added antianticamper The 3d "drum" is a ball and is fixed on the boundary (sphere). So solutions will be time dependent functions on the 3d ball which are constantly 0 on the spherical boundary.
Oct 4, 2011 at 16:16 comment added Aaron Hoffman You're asking about eigenfunctions of the Laplacian on a sphere. The keyword "spherical harmonic" will be useful in your search.
Oct 4, 2011 at 15:33 history asked antianticamper CC BY-SA 3.0