January 2021 Speed of random walks, isoperimetry and compression of finitely generated groups
Jérémie Brieussel, Tianyi Zheng
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Ann. of Math. (2) 193(1): 1-105 (January 2021). DOI: 10.4007/annals.2021.193.1.1

Abstract

We give a solution to the inverse problem (given a prescribed function, find a corresponding group) for large classes of speed, entropy, isoperimetric profile, return probability and $L_p$-compression functions of finitely generated groups. For smaller classes, we give solutions among solvable groups of exponential volume growth. As corollaries, we prove a recent conjecture of Amir on joint evaluation of speed and entropy exponents and we obtain a new proof of the existence of uncountably many pairwise non-quasi-isometric solvable groups, originally due to Cornulier and Tessera. We also obtain a formula relating the $L_p$-compression exponent of a group and its wreath product with the cyclic group for$p$ in $[1,2]$.

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Jérémie Brieussel. Tianyi Zheng. "Speed of random walks, isoperimetry and compression of finitely generated groups." Ann. of Math. (2) 193 (1) 1 - 105, January 2021. https://doi.org/10.4007/annals.2021.193.1.1

Information

Published: January 2021
First available in Project Euclid: 21 December 2021

Digital Object Identifier: 10.4007/annals.2021.193.1.1

Subjects:
Primary: 20E22 , 20F69 , 46B85 , 60B15

Keywords: Entropy , Isoperimetry , Random walks , Speed , uniform embedding of groups , wreath products

Rights: Copyright © 2021 Department of Mathematics, Princeton University

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Vol.193 • No. 1 • January 2021
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