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arXiv 2101.03331math.DGmath.MG
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${\rm RCD}(0,N)$空间中调和函数的单调性公式

Monotonicity formulas for harmonic functions in ${\rm RCD}(0,N)$ spaces

Nicola Gigli, Ivan Yuri Violo

摘要:

本文将Colding和Minicozzi关于具有非负里奇曲率的黎曼流形中正调和函数的一族单调性公式推广到${\rm RCD}(0,N)$集.刚性和几乎刚性的陈述也被证明,第二个似乎是新的,即使在顺利的设置。受[AFM]最近工作的启发,我们还在${\rm RCD}$空间中引入了静电势的概念,它也满足我们的单调性公式。我们的论点主要是基于${\rm RCD}(K,N)$空间中调和函数的新估计和“(几乎)外体积锥蕴涵(几乎)外度量锥”定理的新泛函形式。

英文摘要:

We generalize to the ${\rm RCD}(0,N)$ setting a family of monotonicity formulas by Colding and Minicozzi for positive harmonic functions in Riemannian manifolds with non-negative Ricci curvature. Rigidity and almost rigidity statements are also proven, the second appearing to be new even in the smooth setting. Motivated by the recent work in [AFM] we also introduce the notion of electrostatic potential in ${\rm RCD}$ spaces, which also satisfies our monotonicity formulas. Our arguments are mainly based on new estimates for harmonic functions in ${\rm RCD}(K,N)$ spaces and on a new functional version of the `(almost) outer volume cone implies (almost) outer metric cone' theorem.

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