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- W3005573821 abstract "We develop index theory on compact Riemannian spin manifolds with boundary in the case when the topological information is encoded by bundles which are supported away from the boundary. As a first application, we establish a long neck principle for a compact Riemannian spin $n$-manifold with boundary $X$, stating that if $textrm{scal}(X)geq n(n-1)$ and there is a nonzero degree map into the sphere $fcolon Xto S^n$ which is strictly area decreasing, then the distance between the support of $textrm{d} f$ and the boundary of $X$ is at most $pi/n$. This answers, in the spin setting and for strictly area decreasing maps, a question recently asked by Gromov. As a second application, we consider a Riemannian manifold $X$ obtained by removing $k$ pairwise disjoint embedded $n$-balls from a closed spin $n$-manifold $Y$. We show that if $textrm{scal}(X)>sigma>0$ and $Y$ satisfies a certain condition expressed in terms of higher index theory, then the radius of a geodesic collar neighborhood of $partial X$ is at most $pi sqrt{(n-1)/(nsigma)}$. Finally, we consider the case of a Riemannian $n$-manifold $V$ diffeomorphic to $Ntimes [-1,1]$, with $N$ a closed spin manifold with nonvanishing Rosenberg index. In this case, we show that if $textrm{scal}(V)geqsigma>0$, then the distance between the boundary components of $V$ is at most $2pi sqrt{(n-1)/(nsigma)}$. This last constant is sharp by an argument due to Gromov." @default.
- W3005573821 created "2020-02-24" @default.
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- W3005573821 date "2020-02-17" @default.
- W3005573821 modified "2023-09-27" @default.
- W3005573821 title "A long neck principle for Riemannian spin manifolds with positive scalar curvature" @default.
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