Semigenerated Carnot algebras and applications to sub-Riemannian perimeter
Le Donne, E., & Moisala, T. (2021). Semigenerated Carnot algebras and applications to sub-Riemannian perimeter. Mathematische Zeitschrift, 299(3-4), 2257-2285. https://doi.org/10.1007/s00209-021-02744-4
Published inMathematische Zeitschrift
DisciplineGeometrinen analyysi ja matemaattinen fysiikkaMatematiikkaAnalyysin ja dynamiikan tutkimuksen huippuyksikköGeometric Analysis and Mathematical PhysicsMathematicsAnalysis and Dynamics Research (Centre of Excellence)
© The Author(s) 2021
This paper contributes to the study of sets of finite intrinsic perimeter in Carnot groups. Our intent is to characterize in which groups the only sets with constant intrinsic normal are the vertical half-spaces. Our viewpoint is algebraic: such a phenomenon happens if and only if the semigroup generated by each horizontal half-space is a vertical half-space. We call semigenerated those Carnot groups with this property. For Carnot groups of nilpotency step 3 we provide a complete characterization of semigeneration in terms of whether such groups do not have any Engel-type quotients. Engel-type groups, which are introduced here, are the minimal (in terms of quotients) counterexamples. In addition, we give some sufficient criteria for semigeneration of Carnot groups of arbitrary step. For doing this, we define a new class of Carnot groups, which we call type (◊)(◊) and which generalizes the previous notion of type (⋆)(⋆) defined by M. Marchi. As an application, we get that in type (◊)(◊) groups and in step 3 groups that do not have any Engel-type algebra as a quotient, one achieves a strong rectifiability result for sets of finite perimeter in the sense of Franchi, Serapioni, and Serra-Cassano. ...
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Additional information about fundingOpen access funding provided by University of Jyväskylä (JYU).
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