Semmes surfaces and intrinsic Lipschitz graphs in the Heisenberg group
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- by Katrin Fässler, Tuomas Orponen and Séverine Rigot PDF
- Trans. Amer. Math. Soc. 373 (2020), 5957-5996 Request permission
Abstract:
A Semmes surface in the Heisenberg group is a closed set $S$ that is upper Ahlfors-regular with codimension one and satisfies the following condition, referred to as Condition B. Every ball $B(x,r)$ with $x \in S$ and $0 < r < \operatorname {diam} S$ contains two balls with radii comparable to $r$ which are contained in different connected components of the complement of $S$. Analogous sets in Euclidean spaces were introduced by Semmes in the late 1980s. We prove that Semmes surfaces in the Heisenberg group are lower Ahlfors-regular with codimension one and have big pieces of intrinsic Lipschitz graphs. In particular, our result applies to the boundary of chord-arc domains and of reduced isoperimetric sets. The proof of the main result uses the concept of quantitative non-monotonicity developed by Cheeger, Kleiner, Naor, and Young. The approach also yields a new proof for the big pieces of Lipschitz graphs property of Semmes surfaces in Euclidean spaces.References
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Additional Information
- Katrin Fässler
- Affiliation: Department of Mathematics, University of Fribourg, Switzerland
- Address at time of publication: Department of Mathematics and Statistics, University of Jyväskylä, P.O. Box 35 (MaD), FI-40014 University of Jyväskylä, Finland
- MR Author ID: 881835
- ORCID: 0000-0001-7920-7810
- Email: katrin.s.fassler@jyu.fi
- Tuomas Orponen
- Affiliation: Department of Mathematics and Statistics, University of Helsinki, P.O. Box 68 (Pietari Kalmin katu 5), FI-00014 University of Helsinki, Finland
- MR Author ID: 953075
- Email: tuomas.orponen@helsinki.fi
- Séverine Rigot
- Affiliation: Université Côte d’Azur, CNRS, LJAD, Parc Valrose, 06108 Nice Cedex 02, France
- MR Author ID: 664979
- ORCID: 0000-0001-5552-5822
- Email: Severine.RIGOT@univ-cotedazur.fr
- Received by editor(s): February 25, 2019
- Received by editor(s) in revised form: February 18, 2020
- Published electronically: May 26, 2020
- Additional Notes: The first author was supported by Swiss National Science Foundation via the project Intrinsic rectifiability and mapping theory on the Heisenberg group, grant no. $161299$.
The second author was supported by the Academy of Finland via the project Quantitative rectifiability in Euclidean and non-Euclidean spaces, grant no. $309365$, and by the University of Helsinki via the project Quantitative rectifiability of sets and measures in Euclidean spaces and Heisenberg groups, grant no. $75160012$.
The third author was partially supported by the French National Research Agency, Sub-Riemannian Geometry and Interactions ANR-15-CE40-0018 project. - © Copyright 2020 American Mathematical Society
- Journal: Trans. Amer. Math. Soc. 373 (2020), 5957-5996
- MSC (2010): Primary 28A75; Secondary 28A78
- DOI: https://doi.org/10.1090/tran/8146
- MathSciNet review: 4127898