Abstract
We study the evolution of compact convex curves in two-dimensional space forms. The normal speed is given by the difference of the weighted inverse curvature with the support function, and in the case where the ambient space is the Euclidean plane, is equivalent to the standard inverse curvature flow. We prove that solutions exist for all time and converge exponentially fast in the smooth topology to a standard round geodesic circle. This has a number of consequences: first, to prove the isoperimetric inequality; second, to establish a range of weighted geometric inequalities; and third, to give a counterexample to the \(n=2\) case of a conjecture of Girão–Pinheiro.
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Acknowledgements
Kwok-Kun Kwong would like to thank Man-Chun Lee for useful discussions. Yong Wei was supported by the National Key R and D Program of China 2020YFA0713100 and Research Grant KY0010000052 from University of Science and Technology of China. Valentina-Mira Wheeler was supported in part by Discovery Project DP180100431 and DECRA DE190100379 of the Australian Research Council. We would also like to thank the referees for their comments and useful advice on our paper.
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Kwong, KK., Wei, Y., Wheeler, G. et al. On an inverse curvature flow in two-dimensional space forms. Math. Ann. 384, 1–24 (2022). https://doi.org/10.1007/s00208-021-02285-5
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DOI: https://doi.org/10.1007/s00208-021-02285-5