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arXiv 2311.04493math.DG
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关于共形双调和映射与超曲面

On conformal biharmonic maps and hypersurfaces

University of Rostock(罗斯托克大学);Al.I. Cuza University of Iasi(雅西亚历山德鲁·伊·库扎大学)

Volker Branding, Simona Nistor, Cezar Oniciuc

AI总结:

本文引入共形双能量泛函,研究其临界点共形双调和映射,分类了球面中共形双调和超球面和广义Clifford环面,并发现双曲空间也存在共形双调和超曲面,最后计算了超球面的稳定性指标。

摘要:

本文对共形双能量泛函进行了彻底的几何研究,该泛函由标准双能量加上两个额外的曲率项构成。共形双能量在四维中具有共形不变性,其精确结构由共形几何中的Paneitz算子所启发。共形双能量的临界点称为共形双调和映射。除了建立共形双调和映射的一些基本结果外,我们特别关注空间形式中的共形双调和超曲面。对于球面中的超曲面,我们确定了所有共形双调和超球面,然后分类了所有共形双调和广义Clifford环面。此外,与双调和超曲面形成鲜明对比的是,我们证明了双曲空间中也存在共形双调和超曲面,指出了双调和超曲面与共形双调和超曲面之间的根本差异。最后,我们还研究了球面中共形双调和超球面的稳定性,并明确计算了它们的指标和零度。特别地,我们得到$\mathbb{S}^5$中的赤道$\mathbb{S}^4$的指标为零,即它是稳定的,而$\mathbb{S}^6$中的赤道$\mathbb{S}^5$的指标为七。

英文摘要:

In this article we initiate a thorough geometric study of the conformal bienergy functional which consists of the standard bienergy augmented by two additional curvature terms. The conformal bienergy is conformally invariant in dimension four and its precise structure is motivated by the Paneitz operator from conformal geometry. The critical points of the conformal bienergy are called conformal biharmonic maps. Besides establishing a number of basic results on conformal biharmonic maps, we pay special attention to conformal biharmonic hypersurfaces in space forms. For hypersurfaces in spheres, we determine all conformal biharmonic hyperspheres and then we classify all conformal biharmonic generalized Clifford tori. Moreover, in sharp contrast to biharmonic hypersurfaces, we show that there also exist conformal biharmonic hypersurfaces of hyperbolic space, pointing out a fundamental difference between biharmonic and conformal biharmonic hypersurfaces. Finally, we also study the stability of the conformal biharmonic hyperspheres in spheres and explicitly compute their index and nullity. In particular, we obtain that the index of the equator $\mathbb{S}^4$ of $\mathbb{S}^5$ is zero, i.e., it is stable, while the index of the equator $\mathbb{S}^5$ of $\mathbb{S}^6$ is seven.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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