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arXiv 1709.04017math.DGmath.MG
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$RCD(K,\infty)$ -空间上谱间隙的刚性

Rigidity for the spectral gap on $RCD(K,\infty)$-spaces

Nicola Gigli, Christian Ketterer, Kazumasa Kuwada, Shin-ichi Ohta

摘要:

考虑了$RCD(K,\infty)$ -空间(满足黎曼曲率维数条件的度量测度空间)上Laplacian算子的谱隙的刚性问题,其中$K$为正的.对于加权黎曼流形,Cheng-Zhou证明了只有当$1$维高斯空间被分裂时才能得到尖锐的谱隙。这可以被看作是一个无穷维对应小畑刚定理。由于缺乏光滑结构和加倍条件,推广到$RCD(K,\infty)$ -空间并不简单。我们采用电梯的本征函数的Wasserstein空间和理论的经常拉格朗日流动最近开发的Ambrosio-Trevisan克服这个困难。

英文摘要:

We consider a rigidity problem for the spectral gap of the Laplacian on an $RCD(K,\infty)$-space (a metric measure space satisfying the Riemannian curvature-dimension condition) for positive $K$. For a weighted Riemannian manifold, Cheng--Zhou showed that the sharp spectral gap is achieved only when a $1$-dimensional Gaussian space is split off. This can be regarded as an infinite-dimensional counterpart to Obata's rigidity theorem. Generalizing to $RCD(K,\infty)$-spaces is not straightforward due to the lack of smooth structure and doubling condition. We employ the lift of an eigenfunction to the Wasserstein space and the theory of regular Lagrangian flows recently developed by Ambrosio--Trevisan to overcome this difficulty.

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