A quasiconformal Hopf soap bubble theorem
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AuthorGálvez López, José Antonio
Gálvez, J.A., Mira, P. & Tassi, M.P. A quasiconformal Hopf soap bubble theorem. Calc. Var. 61, 129 (2022). [https://doi.org/10.1007/s00526-022-02222-7]
SponsorshipMCIN/AEI PID2020-118137GB-I00 CEX2020-001105-M; Junta de Andalucia A-FQM-139-UGR18 P18-FR-4049; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) 2020/03431-6
We showthat any compact surface of genus zero inR3 that satisfies a quasiconformal inequality between its principal curvatures is a round sphere. This solves an old open problem by H. Hopf, and gives a spherical version of Simon’s quasiconformal Bernstein theorem. The result generalizes, among others, Hopf’s theorem for constant mean curvature spheres, the classification of round spheres as the only compact ellipticWeingarten surfaces of genus zero, and the uniqueness theorem for ovaloids by Han, Nadirashvili and Yuan. The proof relies on the Bers-Nirenberg representation of solutions to linear elliptic equations with discontinuous coefficients.