Equivalence of sub-Laplacian on Polarized groups
Abstract
We characterize smooth maps between sub-Riemannian Lie groups that commute with sub-Laplacians. We show they are sub-Riemannian conformal submersions. Our work clarifies the analysis initiated on Carnot groups in MR2363343. In particular, we show that the sub-Laplacian in a Carnot group determines the sub-Riemannian structure.
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