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arXiv 1603.03335math.DG
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H^2xR中极小曲面的全曲率集中

Concentration of total curvature of minimal surfaces in H^2xR

Ricardo Sa Earp, Eric Toubiana

摘要:

证明了积空间H^2 × R中稳定极小曲面的全曲率集中现象,其中H^2是双曲平面.在H^2xR中浸入的定向稳定极小曲面的渐近边界上的某些几何条件下,它具有无穷大的全曲率。特别地,我们推断出H^2 × R中的极小图M具有无穷大的全曲率,其中M的渐近边界是H^2的渐近边界的弧上的图,不同于M的边界的渐近边界。因此,如果M是浸入H^2 × R中的稳定极小曲面,且具有紧边界,使得它的渐近边界是H^2的整个渐近边界上的图,则它具有无穷大的全曲率。我们展示了一个极小图的例子,使得在一个域的渐近边界是一个垂直段的全曲率是有限的,但图的全曲率是无限的,由前面引用的定理。给出了H^2xR中无限全曲率极小曲面及其渐近边界的一些简单而特殊的例子。

英文摘要:

We prove a phenomenon of concentration of total curvature for stable minimal surfaces in the product space H^2xR; where H^2 is the hyperbolic plane. Under some geometric conditions on the asymptotic boundary of an oriented stable minimal surface immersed in H^2xR, it has infinite total curvature. In particular, we infer that a minimal graph M in H^2xR whose asymptotic boundary is a graph over an arc of the asymptotic boundary of H^2, different from the asymptotic boundary of the boundary of M, has infinite total curvature. Consequently, if M is a stable minimal surface immersed into H^2xR with compact boundary, such that its asymptotic boundary is a graph over the whole asymptotic boundary of H^2; then it has infinite total curvature. We exhibit an example of a minimal graph such that in a domain whose asymptotic boundary is a vertical segment the total curvature is finite, but the total curvature of the graph is infinite, by the theorem cited before. We also present some simple and peculiar examples of infinite total curvature minimal surfaces in H^2xR and their asymptotic boundaries.

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