Multipole expansions in four-dimensional hyperspherical harmonics

Details Multipole expansions in four-dimensional hyperspherical harmonics Multipole expansions in four-dimensional hyperspherical harmonics

2005-10-24

arxiv.org/abs/math-ph/0510080v2

J. Phys. A, vol. 39, p.3099, 2006

Physics

Mathematical Physics

19 pages, no figures

Scientific paper

10.1088/0305-4470/39/12/017

The technique of vector differentiation is applied to the problem of the derivation of multipole expansions in four-dimensional space. Explicit expressions for the multipole expansion of the function $r^n C_j (\hr)$ with $\vvr=\vvr_1+\vvr_2$ are given in terms of tensor products of two hyperspherical harmonics depending on the unit vectors $\hr_1$ and $\hr_2$. The multipole decomposition of the function $(\vvr_1 \cdot \vvr_2)^n$ is also derived. The proposed method can be easily generalised to the case of the space with dimensionality larger than four. Several explicit expressions for the four-dimensional Clebsch-Gordan coefficients with particular values of parameters are presented in the closed form.

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