Symmetric double bubbles in the Grushin plane

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Abstract
We address the double bubble problem for the anisotropic Grushin perimeterPα,α≥ 0, and the Lebesgue measure in ℝ2, in the case of two equal volumes. We assume that thecontact interfacebetween the bubbles lies on either the vertical or the horizontal axis. We first prove existence of minimizersviathe 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 forα= 0 the Grushin perimeter reduces to the Euclidean one and both minimizers coincide with the symmetric double bubble found in Foisyet al.[Pacific J. Math.159(1993) 47–59], forα= 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.

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