发表机构
Michigan State University(密歇根州立大学)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本文证明在正 BiRicci 曲率及特定衰减条件下,$n=6,7$ 的驯服可缩流形同胚于 $\mathbb{R}^n$,并构造了满足相关条件的 Newman 流形。
AI 中文摘要
我们证明,若 $M^n$,$n=6,7$,是紧致可缩 $n$-流形(其边界为 $X$)的内部,满足 $\pi_i(X,\partial X)=0$,$3\leq i \leq n-3$,且支持具有正 BiRicci 曲率的完备度量,该曲率在无穷远处具有 $C$-二次衰减,其中 $C>\frac{n^2}{4}$,则 $M$ 微分同胚于 $\mathbb{R}^n$。此外,我们基于 Higman 群的一个表示构造了一个紧致可缩 Newman $n$-流形 $N^n$,$n\geq6$,满足 $\pi_i(N,\partial N)=0$,$3\leq i \leq n-3$,且 $\mathrm{int}(N)$ 允许一个具有一致正数量曲率的度量。
英文摘要
We show that if $M^n$, $n=6,7$, is the interior of a compact, contractible $n$-manifold with boundary $X$, such that $π_i(X,\partial X)=0$, $3\leq i \leq n-3$, and supports complete metrics with positive BiRicci curvature with $C$-quadratic decay at infinity for some $C>\frac{n^2}{4}$, then $M$ is diffeomorphic to $\mathbb{R}^n$. Furthermore, we construct a compact, contractible Newman $n$-manifold $N^n$, $n\geq6$, based on a presentation of the Higman group such that $π_i(N,\partial N)=0$, $3\leq i \leq n-3$, and $\mathrm{int}(N)$ admits a metric with uniform positive scalar curvature.
Comments13 pages, 1 figure