Symmetric double bubbles in the Grushin plane

¹ FMJH & IMO, Bâtiment 307, Faculté des Sciences d’Orsay, Université Paris Sud, Orsay, France.
² Scuola Normale Superiore, Piazza Cavalieri 7, 56126 Pisa, Italy.

^* Corresponding author: valentina.franceschi88@gmail.com

Received: 18 March 2018
Accepted: 9 October 2018

Abstract

We address the double bubble problem for the anisotropic Grushin perimeter P_α, 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.