Papers › FaVeST: Fast Vector Spherical Harmonic Transforms
FaVeST: Fast Vector Spherical Harmonic Transforms
Quoc T. Le Gia, Ming Li, Yu Guang Wang
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Vector spherical harmonics on the unit sphere of ℝ³ have broad applications in geophysics, quantum mechanics and astrophysics. In the representation of a tangent vector field, one needs to evaluate the expansion and the Fourier coefficients of vector spherical harmonics. In this paper, we develop fast algorithms (FaVeST) for vector spherical harmonic transforms on these evaluations. The forward FaVeST evaluates the Fourier coefficients and has a computational cost proportional to Nlog√(N) for N number of evaluation points. The adjoint FaVeST which evaluates a linear combination of vector spherical harmonics with a degree up to √(M) for M evaluation points has cost proportional to Mlog√(M). Numerical examples of simulated tangent fields illustrate the accuracy, efficiency and stability of FaVeST.
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