Area-minimizing properties of Pansu spheres in the sub-Riemannian 3-sphere Hurtado Cortegana, Ana María Rosales Lombardo, Manuel César Sub-Riemannian spheres Plateau problem Isoperimetric problem Calibrations The authors were supported by MINECO grant MTM2017-84851-C2-1-P and Junta de Andaluc´ıa grants A-FQM-441-UGR18 and FQM325. We consider the sub-Riemannian 3- sphere (S-3, gh) obtained by restriction of the Riemannian metric of constant curvature 1 to the planar distribution orthogonal to the vertical Hopf vector field. It was shown in [A. Hurtado and C. Rosales, Area-stationary surfaces inside the sub-Riemannian three-sphere, Math. Ann. 340 (2008), no. 3, 675-708] that (S-3, g(h)) contains a family of spherical surfaces {S-lambda}(lambda >= 0) with constant mean curvature.. In this work, we first prove that the two closed half-spheres of S-0 with boundary C-0 = {0} x S-1 minimize the sub-Riemannian area among compact C-1 surfaces with the same boundary. We also see that the only C-2 solutions to this Plateau problem are vertical translations of such half-spheres. Second, we establish that the closed 3-ball enclosed by a sphere S-lambda with lambda > 0 uniquely solves the isoperimetric problem in (S-3, g(h)) for C-1 sets inside a vertical solid tube and containing a horizontal section of the tube. The proofs mainly rely on calibration arguments. 2022-05-04T11:12:05Z 2022-05-04T11:12:05Z 2021-06-10 info:eu-repo/semantics/article Published version: Hurtado, A. & Rosales, C. (2022). Area-minimizing properties of Pansu spheres in the sub-Riemannian 3-sphere. Advances in Calculus of Variations, (). [https://doi.org/10.1515/acv-2021-0050] http://hdl.handle.net/10481/74693 eng http://creativecommons.org/licenses/by-nc-nd/3.0/es/ info:eu-repo/semantics/openAccess Atribución-NoComercial-SinDerivadas 3.0 España De Gruyter