Abstract
We prove that every 1-Lipschitz map from a closed metric surface onto a closed Riemannian surface that has the same area is an isometry. If we replace the target space with a non-smooth surface, then the statement is not true and we study the regularity properties of such a map under different geometric assumptions. Our proof relies on a coarea inequality for continuous Sobolev functions on metric surfaces that we establish, and which generalizes a recent result of Esmayli–Ikonen–Rajala.
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Acknowledgements
The paper was written while the first-named author was visiting Stony Brook University. She wishes to thank the department for their hospitality. The authors would like to thank Stefan Wenger and the anonymous referee for their valuable comments and suggestions.
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Damaris Meier is partially supported by UniFr Doc.Mobility Grant DM-22-10. Dimitrios Ntalampekos is partially supported by NSF Grants DMS-2000096 and DMS-2246485, and by the Simons Foundation.
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Meier, D., Ntalampekos, D. Lipschitz-Volume Rigidity and Sobolev Coarea Inequality for Metric Surfaces. J Geom Anal 34, 128 (2024). https://doi.org/10.1007/s12220-024-01577-x
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DOI: https://doi.org/10.1007/s12220-024-01577-x
Keywords
- Lipschitz-volume rigidity
- Metric surfaces
- Reciprocal
- Quasiconformal
- Ahlfors regular
- Coarea inequality
- Sobolev