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Rigidity of the 1-Bakry-\'Emery inequality and sets of finite perimeter in RCD spaces

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arxiv 1812.07890 v2 pith:WFQGI4DA submitted 2018-12-19 math.MG

classification math.MG
keywords perimeterspacesbakry-emeryexistencefiniteinequalitymeasure
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This note is dedicated to the study of the asymptotic behaviour of sets of finite perimeter over RCD(K,N) metric measure spaces. Our main result asserts existence of a Euclidean tangent half-space almost everywhere with respect to the perimeter measure and it can be improved to an existence and uniqueness statement when the ambient is non collapsed. As an intermediate tool, we provide a complete characterization of the class of RCD(0,N) spaces for which there exists a nontrivial function satisfying the equality in the 1-Bakry-\'Emery inequality. This result is of independent interest and it is new, up to our knowledge, even in the smooth framework.

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  1. Rectifiability of the reduced boundary for sets of finite perimeter over RCD$(K,N)$ spaces

    math.MG 2019-09 conditional novelty 7.0 of 10

    In RCD(K,N) spaces, the reduced boundary of a set of finite perimeter has a unique Euclidean half-space tangent at almost every point and is rectifiable by bi-Lipschitz charts.

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