Generalized polar transforms of spacelike isothermic surfaces

Generalized polar transforms of spacelike isothermic surfaces
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类空间等温面的广义极坐标变换

DOI:
10.1016/j.geomphys.2011.11.003
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发表时间:
2011-11
影响因子:
1.5
通讯作者:
Peng Wang
Peng Wang
中科院分区:
数学3区
文献类型:
--
作者:
Peng Wang

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本文将Q14中类空等温曲面的极变换推广到n维伪黎曼空间形式Qrn。我们证明了存在由Qrn中的类空等温面衍生的c-极类空等温面,它们是Srn+1(c),Hr− 1 n +1(c)或Qrn,依赖于c>0,<0,或=0。c-极等温曲面可以刻画为具有零极小截面的广义H-曲面。我们还证明了如果原曲面及其c-极曲面都是闭浸入,则它们具有相同的Willmore泛函。作为例子,我们讨论了一些乘积曲面,并计算了它们的c-极变换。最后,我们给出了等温曲面的c-极变换、达布变换和谱变换的置换定理。
In this paper, we generalize the polar transforms of spacelike isothermic surfaces in Q14to n-dimensional pseudo-Riemannian space forms Qrn. We show that there exist c-polar spacelike isothermic surfaces derived from a spacelike isothermic surface in Qrn, which are into Srn+1(c), Hr−1n+1(c) or Qrndepending on c>0,<0, or =0. The c-polar isothermic surfaces can be characterized as generalized H-surfaces with null minimal sections. We also prove that if both the original surface and its c-polar surface are closed immersion, then they have the same Willmore functional. As examples, we discuss some product surfaces and compute the c-polar transforms of them. In the end, we derive the permutability theorems for c-polar transforms and Darboux transform and spectral transform of isothermic surfaces.
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