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Gartland, Chris
arXiv (Cornell University), 12/2019Paper, Journal Article
We show that every graded nilpotent Lie group \(G\) of step \(r\), equipped with a left invariant metric homogeneous with respect to the dilations induced by the grading, (this includes all Carnot groups with Carnot-Caratheodory metric) is Markov \(p\)-convex for all \(p \in 2r,\infty)\). We also show that this is sharp whenever \(G\) is a Carnot group with \(r \leq 3\), a free Carnot group, or a jet space group; such groups are not Markov \(p\)-convex for any \(p \in (0,2r)\). This continues a line of research started by Li who proved this sharp result when \(G\) is the Heisenberg group. As corollaries, we obtain new estimates on the non-biLipschitz embeddability of some finitely generated nilpotent groups into nilpotent Lie groups of lower step. Sharp estimates of this type are known when the domain is the Heisenberg group and the target is a uniformly convex Banach space or \(L^1\), but not when the target is a nonabelian nilpotent group.
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