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arXiv 1608.04061math.AP
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一类具有非负里奇曲率的黎曼流形上的二阶Sobolev不等式

Second-order Sobolev inequalities on a class of Riemannian manifolds with nonnegative Ricci curvature

Ezequiel Barbosa, Alexandru Kristály

摘要:

设$(M,g)$是$n-$维完备开黎曼流形,具有非负里奇曲率,证明了$ρΔ_g ρ\geq n- 5\geq 0$,其中$Δ_g$是$(M,g)$上的Laplace-Beltrami算子,$ρ$是到给定点的距离函数.如果$(M,g)$支持一个二阶Sobolev不等式,且其常数$C>0$接近于$\mathbb R^n$中二阶Sobolev不等式中的最优常数$K_0$,则证明了$(M,g)$的整体体积非坍缩性质.后者的财产连同一个佩雷尔曼型建设建立的Munn(J. Geom. Anal.,2010)给出了几个关于$(M,g)$高阶同伦群的刚性结果。进一步证明了$(M,g)$支持二阶Sobolev不等式且$C=K_0$为常数当且仅当$(M,g)$与欧氏空间$\mathbb R^n$等距.

英文摘要:

Let $(M,g)$ be an $n-$dimensional complete open Riemannian manifold with nonnegative Ricci curvature verifying $ρΔ_g ρ\geq n- 5\geq 0$, where $Δ_g$ is the Laplace-Beltrami operator on $(M,g)$ and $ρ$ is the distance function from a given point. If $(M,g)$ supports a second-order Sobolev inequality with a constant $C>0$ close to the optimal constant $K_0$ in the second-order Sobolev inequality in $\mathbb R^n$, we show that a global volume non-collapsing property holds on $(M,g)$. The latter property together with a Perelman-type construction established by Munn (J. Geom. Anal., 2010) provide several rigidity results in terms of the higher-order homotopy groups of $(M,g)$. Furthermore, it turns out that $(M,g)$ supports the second-order Sobolev inequality with the constant $C=K_0$ if and only if $(M,g)$ is isometric to the Euclidean space $\mathbb R^n$.

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