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Commentarii Mathematici Helvetici
Article . 2024 . Peer-reviewed
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Article . 2024
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https://dx.doi.org/10.48550/ar...
Article . 2021
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Area and Gauss–Bonnet inequalities with scalar curvature

Area and Gauss-Bonnet inequalities with scalar curvature
Authors: Gromov, Misha; Zhu, Jintian;

Area and Gauss–Bonnet inequalities with scalar curvature

Abstract

The Gauss–Bonnet theorem states for any compact surface (S,g) that the quantity Q^{S}_{GB}(S)=\int_{S} \operatorname{Sc}(S,s)\,\mathrm{d}s+\int_{\partial S}\mathrm{mean.curv.}(\partial S,b)\,\mathrm{d}b-4\pi\chi(S) vanishes identically. Let (X,g) be a compact Riemannian manifold of dimension n\geq 3 with smooth boundary, associated with a continuous map {f=(f_1,\ldots,f_{n-2}) \colon X\to [0,1]^{n-2}} , where \operatorname{Lip}f_{i}\leq d_{i}^{-1} for positive constants d_{i} . For a universal constant C_{n}(d_{i}) depending only on d_{i} and n , we show that there is a compact surface \Sigma homologous to the f -pullback of a generic point such that each component S of \Sigma satisfies Q_{GB}^{X}(S)\leq C_{n}(d_{i})\cdot\operatorname{area}(S) , where Q^{X}_{GB}(S)=\int_{S} \operatorname{Sc}(X,s)\,\mathrm{d}s+\int_{\partial S}\mathrm{mean.curv.}(\partial X,b)\,\mathrm{d}b-4\pi\chi(S). As corollaries, if X has “large positive” scalar curvature, we prove in a variety of cases that if X “spreads” in (n-2) directions “ distance-wise ”, then it cannot much “spread” in the remaining 2-directions “ area-wise ”.

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Keywords

\(\mu\)-bubble method, Mathematics - Differential Geometry, Differential Geometry (math.DG), Global geometric and topological methods (à la Gromov); differential geometric analysis on metric spaces, area inequality, FOS: Mathematics, Gauss-Bonnet inequality, scalar curvature, Global Riemannian geometry, including pinching

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Top 10%
Average
Average
Green
gold