Calculus of Variations and Geometric Measure Theory

D. Bucur - I. FragalĂ  - G. Verzini - B. Velichkov

On the honeycomb conjecture for a class of minimal convex partitions

created by velichkov on 17 Mar 2017
modified on 21 Apr 2018


Accepted Paper

Inserted: 17 mar 2017
Last Updated: 21 apr 2018

Journal: Trans. Amer. Math. Soc.
Year: 2017


We prove that the planar hexagonal honeycomb is asymptotically optimal for a large class of optimal partition problems, in which the cells are assumed to be convex, and the criterion is to minimize either the sum or the maximum among the energies of the cells, the cost being a shape functional which satisfies a few assumptions. They are: monotonicity under inclusions; homogeneity under dilations; a Faber-Krahn inequality for convex hexagons; a convexity-type inequality for the map which associates with every $n\in\mathbb{N}$ the minimizers of F among convex n-gons with given area. In particular, our result allows to obtain the honeycomb conjecture for the Cheeger constant and for the logarithmic capacity (still assuming the cells to be convex). Moreover we show that, in order to get the conjecture also for the first Dirichlet eigenvalue of the Laplacian, it is sufficient to establish some facts about the behaviour of $\lambda_1$ among convex pentagons, hexagons, and heptagons with prescribed area.