Stochastic approximation of lamplighter metrics
Stochastic approximation of lamplighter metrics
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点灯者指标的随机近似
DOI:
10.1112/blms.12657
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发表时间:
2022
影响因子:
0.9
通讯作者:
Zsák, András
中科院分区:
文献类型:
--
作者:
Baudier, Florent;Motakis, Pavlos;Schlumprecht, Thomas;Zsák, András
We observe that embeddings into random metrics can be fruitfully used to study the L1$L_1$‐embeddability of lamplighter graphs or groups, and more generally lamplighter metric spaces. Once this connection has been established, several new upper bound estimates on the L1$L_1$‐distortion of lamplighter metrics follow from known related estimates about stochastic embeddings into dominating tree‐metrics. For instance, every lamplighter metric on an n$n$‐point metric space embeds bi‐Lipschitzly into L1$L_1$ with distortion O(logn)$O(\log n)$. In particular, for every finite group G$G$ the lamplighter group H=Z2≀G$H=\mathbb {Z}_2\wr G$ bi‐Lipschitzly embeds into L1$L_1$ with distortion O(loglog|H|)$O(\log \log |H|)$. In the case where the ground space in the lamplighter construction is a graph with some topological restrictions, better distortion estimates can be achieved. Finally, we discuss how a coarse embedding into L1$L_1$ of the lamplighter group over the d$d$‐dimensional infinite lattice Zd$\mathbb {Z}^d$ can be constructed from bi‐Lipschitz embeddings of the lamplighter graphs over finite d$d$‐dimensional grids, and we include a remark on Lipschitz free spaces over finite metric spaces.
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