Constant mean curvature surfaces in $S^3$ can be studied via their associated family of flat connections. In the case of tori this approach has led to a deep understanding of the moduli space of all CMC tori. For compact CMC surfaces of higher genus the theory is far more involved due to the non abelian nature of their fundamental group. In this paper we extend the spectral curve theory for tori developed in \cite{Hi, PiSt} and for genus $2$ surfaces \cite{He3} to CMC surfaces in $S^3$ of genus $g=k\cdot l$ with commuting $\mathbb Z_{k+1}$ and $\mathbb Z_{l+1}$ symmetries. We determine their associated family of flat connections via certain flat line bundle connections parametrized by the spectral curve. We generalize the flow on spectral data introduced in \cite{HeHeSch} and prove the short time existence of this flow for certain families of initial surfaces. In this way we obtain various families of new CMC surfaces of higher genus with prescribed branch points and prescribed umbilics.
Inspired by the work of Heller [12], we show that there exists a DPW potential for the Lawson surface $ξ_{k-1, l-1}$ from which it is possible to reconstruct the minimal immersion $f: ξ_{k-1, l-1} \to \mathbb{S}^3$ via the DPW method. Moreover, we extend the result to surfaces immersed in the 3-sphere with constant mean curvature which satisfy a certain symmetric condition.
A dynamical interpretation of the profile curve of cmc Twizzlers surfaces
众所周知,对于任何非零的$M in (-1/4,infty)$,如果我们在平面中的一条直线上滚动二次曲线{(x,y):4 x^2-y^2/M}=1},然后我们围绕这条直线旋转焦点的轨迹,那么我们获得具有中曲率1的旋转曲面D(M)。当M<=0时,D(M)是嵌入的,称之为波状体;当M>0时,D(M)不是嵌入的,称之为结节体。这些表面被称为Delaunay,它们由圆组成。上述结构中焦点的轨迹称为Delaunay轮廓曲线,它横切于圆。另一个众所周知的家庭恒定的中曲率表面是Twizzlers,他们是叶状的螺旋线,我们可以自然地定义一个轮廓曲线是横向的螺旋线。为了使本摘要中的演示更容易,我们将只考虑中曲率为1的Twizzlers。在本文中,我们将证明,如果我们在平面中的一条线上滚动Twizzler的轮廓曲线,并且同时,我们以相同的速度移动该线中的点,使得轮廓曲线的滚动运动看起来像是放置在跑步机上,那么,由轮廓曲线的原点形成的轨迹是闭合心形曲线HS(M,w)={(x,y):x^2+y^2+y/(1+ w^2x^2)=M},其中M>-1/4且w>0。利用这种动力学解释,我们将证明Twizzlers的几个性质
In this work, we consider $M=(\mathbb{B}^3_r,\bar{g})$ as the Euclidean three-ball with radius $r$ equipped with the metric $\bar{g}=e^{2h}\left\langle , \right\rangle$ conformal to the Euclidean metric. We show that if a free boundary CMC surface $Σ$ in $M$ satisfies a pinching condition on the length of the traceless second fundamental tensor which involves the support function of $Σ$, the positional conformal vector field $\vec{x}$ and its potential function $σ,$ then either $Σ$ is a disk or $Σ$ is an annulus rotationally symmetric. In a particular case, we construct an example of minimal s…
The Closure of Spectral Data for Constant Mean Curvature Tori in $ S ^ 3 $
sinh-Gordon方程的有限型解的谱曲线对应描述了它们是如何产生和产生具有实结构的超椭圆曲线的。当这些谱曲线满足周期性条件时,$ S ^ 3 $中的常中曲率(CMC)2-环面就产生了。我们证明了CMC环面的谱曲线在sinh-Gordon方程有限型解的光滑谱曲线空间中是稠密的。这样做的一个结果是,对于每个正整数$ n $,在$ S ^ 3 $中存在可数个CMC环面的实$ n $维族.
An extension of Ruh-Vilms Theorem for hypersurfaces in symmetric spaces and some applications
本文的主要目的有两个:第一,将欧几里得空间中著名的Ruh-Vilms定理推广到对称空间;第二,应用这个结果将Hoffman-Osserman-Schoen定理(HOS定理)推广到三维对称空间。精确地定义了浸入对称空间N^n中的超曲面M^{n-1}的高斯映射,其取值于N的等距群dim(g)=m+1的李代数g的单位伪球面S^m,并证明了M具有CMC当且仅当其高斯映射是调和的.作为应用,证明了若dim(N)=3,且浸入N的CMC曲面S的高斯映射的像包含在S^m的由向量X确定的半球中,则S不受由X确定的Killing场N的等距的单参数子群的影响.特别地,将HOS定理推广到三维双曲空间.本文还证明了由Gauss映射导出的全纯二次型是一致的(直到一个符号)当周围空间是空间型时,用Hopf二次型,当周围空间是H^2 x R和S^2 x R时,用Abresch-Rosenberg二次型,然后,在这5种空间中,把CMC曲面的调和高斯映射诱导的二次型与Hopf和Abresch-Rosenberg的二次型统一起来.
We prove that a spacelike spherical symmetric constant mean curvature (SSCMC) surface and a general spacelike constant mean curvature (CMC) surface with certain boundary condition at the future null-infinity in Schwarzschild spacetime are asymptotically hyperbolic in the sense of Wang \cite{Wang2001} and Chruściel-Herzlich \cite{ChruscielHerzlich} respectively. Near the future null-infinity ($s=0$), we derive that the boundary data of spacelike CMC surfaces can be expressed as those on $\mathbb{S}^{2}$ up to three order and obtain a compatibility condition for fourth order derivatives near $s=…
This thesis lies in the field of constant mean curvature (cmc) hypersurfaces and specifically cmc $1/2$ surfaces in the three-manifold $\mathbb{H}^2\times\mathbb{R}$. The value $1/2$ is the critical mean curvature for $\mathbb{H}^2\times\mathbb{R}$, in that there do no exist closed cmc surfaces with mean curvature $1/2$ or less. Daniel and Hauswirth have constructed a one-parameter family of complete, cmc $1/2$ annuli that are symmetric about a reflection in the horizontal plane $\mathbb{H}^2 \times \{0\}$, the horizontal catenoids. In this thesis we prove that these catenoids converge to a si…
In this paper we consider surfaces with one or two families of spherical curvature lines. We show that every surface with a family of spherical curvature lines can locally be generated by a pair of initial data: a suitable curve of Lie sphere transformations and a spherical Legendre curve. We then provide conditions on the initial data for which such a surface is Lie applicable, an integrable class of surfaces that includes cmc and pseudospherical surfaces. In particular we show that a Lie applicable surface with exactly one family of spherical curvature lines must be generated by the lift of …
On the equidistribution of totally geodesic submanifolds in compact locally symmetric spaces and application to boundedness results for negative curves and exceptional divisors