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arXiv 2009.10399math.DG
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从切触观点看Lorentz-Minkowski三维空间中混合型曲面上类光轨迹的几何

Geometry of lightlike locus on mixed type surfaces in Lorentz-Minkowski 3-space from a contact viewpoint

Atsufumi Honda, Shyuichi Izumiya, Kentaro Saji, Keisuke Teramoto

摘要:

Lorentz-Minkowski $3$ -空间中的曲面一般是混合型曲面,即具有类光轨迹。研究了混合型曲面上这类轨迹的局部微分几何性质。我们定义了一个沿类光轨迹的标架场,并利用它定义了两个沿类光轨迹的直纹曲面,它们可以被看作是沿类光轨迹的曲面的类光近似。研究了类光曲面的奇点与类光轨迹的微分几何性质之间的关系。我们还考虑了两个类光近似的交线,它给出了类光轨迹的模型曲线。

英文摘要:

A surface in the Lorentz-Minkowski $3$-space is generally a mixed type surface, namely, it has the lightlike locus. We study local differential geometric properties of such a locus on a mixed type surface. We define a frame field along a lightlike locus, and using it, we define two lightlike ruled surfaces along a lightlike locus which can be regarded as lightlike approximations of the surface along the lightlike locus. We study a relationship of singularities of these lightlike surfaces and differential geometric properties of the lightlike locus. We also consider the intersection curve of two lightlike approximations, which gives a model curve of the lightlike locus.

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