Symmetric double bubbles in the Grushin plane
ESAIM: Control, Optimisation and Calculus of Variations, Tome 25 (2019), article no. 77.

We address the double bubble problem for the anisotropic Grushin perimeter P$$, α ≥ 0, and the Lebesgue measure in ℝ2, in the case of two equal volumes. We assume that the contact interface between the bubbles lies on either the vertical or the horizontal axis. We first prove existence of minimizers via the direct method by symmetrization arguments and then characterize them in terms of the given area by first variation techniques. Even though no regularity theory is available in this setting, we prove that angles at which minimal boundaries intersect satisfy the standard 120-degree rule up to a suitable change of coordinates. While for α = 0 the Grushin perimeter reduces to the Euclidean one and both minimizers coincide with the symmetric double bubble found in Foisy et al. [Pacific J. Math. 159 (1993) 47–59], for α = 1 vertical interface minimizers have Grushin perimeter strictly greater than horizontal interface minimizers. As the latter ones are obtained by translating and dilating the Grushin isoperimetric set found in Monti and Morbidelli [J. Geom. Anal. 14 (2004) 355–368], we conjecture that they solve the double bubble problem with no assumptions on the contact interface.

Reçu le :
Accepté le :
DOI : 10.1051/cocv/2018055
Classification : 53C17, 49Q20
Mots-clés : Calculus of variations, shape optimization, sub-Riemannian manifold, Grushin perimeter, double bubble problem, constrained interface, 120-degree rule
Franceschi, Valentina 1 ; Stefani, Giorgio 1

1 
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Franceschi, Valentina; Stefani, Giorgio. Symmetric double bubbles in the Grushin plane. ESAIM: Control, Optimisation and Calculus of Variations, Tome 25 (2019), article no. 77. doi : 10.1051/cocv/2018055. http://www.numdam.org/articles/10.1051/cocv/2018055/

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