The Spherical Harmonic Spectrum of a Function with Algebraic Singularities
The Spherical Harmonic Spectrum of a Function with Algebraic Singularities
复制标题
具有代数奇点的函数的球调和谱
DOI:
10.1007/s00041-012-9236-3
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发表时间:
2012
影响因子:
1.2
通讯作者:
Livermore P
中科院分区:
文献类型:
--
作者:
Livermore P
The asymptotic behaviour of the spectral coefficients of a function provides a useful diagnostic of its smoothness. On a spherical surface, we consider the coefficientsof fully normalised spherical harmonics of a function that is smooth except either at a point or on a line of colatitude, at which it has an algebraic singularity taking the formθpor |θ−θ0|prespectively, whereθis the co-latitude andp>−1. It is proven that each type of singularity has a signature on the rotationally invariant energy spectrum,wherelandmare the spherical harmonic degree and order, ofl−(p+3/2)orl−(p+1)respectively. This result is extended to any collection of finitely many point or (possibly intersecting) line singularities of arbitrary orientation: in such a case, it is shown that the overall behaviour ofE(l) is controlled by the gravest singularity. Several numerical examples are presented to illustrate the results. We discuss the generalisation of singularities on lines of colatitude to those on any closed curve on a spherical surface.
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