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arXiv math/0608721math.DGphysics.optics
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复标量波相位奇异性的分类

Classification of phase singularities for complex scalar waves

Jiro Adachi, Go-o Ishikawa

摘要:

受相位奇点的重要性和普遍性的启发,本文从H. Whitney和R.托姆利用A。du Plessis,T. Gaffney和L.威尔逊然后将折叠奇异性分为双曲奇异性和椭圆奇异性。我们证明了椭圆奇点永远不会被任何Helmholtz波实现,而双曲奇点实际上是可以实现的。此外,为了解释相位奇点的三点分岔,还讨论了Whitney尖点的分类、可实现性及其分岔问题。本文主要讨论线性波的位错问题,发展了基本的、普遍的方法,即喷流和横截性方法,它也适用于非线性波。

英文摘要:

Motivated by the importance and universal character of phase singularities which are clarified recently, we study the local structure of equi-phase loci near the dislocation locus of complex valued planar and spatial waves, from the viewpoint of singularity theory of differentiable mappings, initiated by H. Whitney and R. Thom. The classification of phase-singularities are reduced to the classification of planar curves by radial transformations due to the theory of A. du Plessis, T. Gaffney, and L. Wilson. Then fold singularities are classified into hyperbolic and elliptic singularities. We show that the elliptic singularities are never realized by any Helmholtz waves, while the hyperbolic singularities are realized in fact. Moreover, the classification and realizability of Whitney's cusp, as well as its bifurcation problem are considered in order to explain the three points bifurcation of phase singularities. In this paper, we treat the dislocation of linear waves mainly, developing the basic and universal method, the method of jets and transversality, which is applicable also to non-linear waves.

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