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Isoperimetric Clusters in Homogeneous Spaces via Concentration Compactness

2022; Springer Science+Business Media; Volume: 32; Issue: 11 Linguagem: Inglês

10.1007/s12220-022-01009-8

1559-002X

Matteo Novaga, Emanuele Paolini, Eugene Stepanov, Vincenzo Maria Tortorelli,

Advanced Topology and Set Theory

We show the existence of generalized clusters of a finite or even infinite number of sets, with minimal total perimeter and given total masses, in metric measure spaces homogeneous with respect to a group acting by measure preserving homeomorphisms, for a quite wide range of perimeter functionals. Such generalized clusters are a natural "relaxed" version of a cluster and can be thought of as "albums" with possibly infinite pages, having a minimal cluster drawn on each page, the total perimeter and the vector of masses being calculated by summation over all pages, the total perimeter being minimal among all generalized clusters with the same masses. The examples include any anisotropic perimeter in a Euclidean space, as well as a hyperbolic plane with the Riemannian perimeter and Heisenberg groups with a canonical left invariant perimeter or its equivalent versions.