Abstract
Integral equation methods for solving the Laplace-Beltrami equation on the unit sphere in the presence of multiple “islands” are presented. The surface of the sphere is first mapped to a multiply-connected region in the complex plane via a stereographic projection. After discretizing the integral equation, the resulting dense linear system is solved iteratively using the fast multipole method for the 2D Coulomb potential in order to calculate the matrix-vector products. This numerical scheme requires only O(N) operations, where N is the number of nodes in the discretization of the boundary. The performance of the method is demonstrated on several examples.
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Communicated by: Leslie Greengard
Supported in part by grants from the Natural Sciences and Engineering Research Council of Canada. NN gratefully acknowledges support from the Canada Research Chairs Council, Canada
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Kropinski, M.C.A., Nigam, N. Fast integral equation methods for the Laplace-Beltrami equation on the sphere. Adv Comput Math 40, 577–596 (2014). https://doi.org/10.1007/s10444-013-9319-y
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DOI: https://doi.org/10.1007/s10444-013-9319-y