Implementing zonal harmonics with the Fueter principle

Altavilla, Amedeo; De Bie, Hendrik; Wutzig, Michael

doi:10.1016/j.jmaa.2020.124764

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Implementing zonal harmonics with the Fueter principle

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Altavilla, Amedeo
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De Bie, Hendrik
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Wutzig, Michael
2.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Altavilla, A., De Bie, H., Wutzig, M. (2021): Implementing zonal harmonics with the Fueter principle. - Journal of Mathematical Analysis and Applications, 495, 2, 124764.
https://doi.org/10.1016/j.jmaa.2020.124764

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009964

Abstract

By exploiting the Fueter theorem, we give new formulas to compute zonal harmonic functions in any dimension. We first give a representation of them as a result of a suitable ladder operator acting on a constant function. Then, inspired by recent work of A. Perotti, using techniques from slice regularity, we derive explicit expressions for zonal harmonics starting from the 2 and 3 dimensional cases. It turns out that all zonal harmonics in any dimension are related to the real part of powers of the standard Hermitian product in C. At the end we compare formulas, obtaining interesting equalities involving the real part of positive and negative powers of the standard Hermitian product. In the two appendices we show how our computations are optimal compared to direct ones.