The classical Baum-Connes assembly map is quantitatively an isomorphism for lacunary hyperbolic groups containing large-girth graph sequences in their Cayley graphs.
Divergence and quasi-isometry classes of random Gromov's monsters
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abstract
We show that Gromov's monsters arising from i.i.d. random labellings of expanders (that we call random Gromov's monsters) have linear divergence along a subsequence, so that in particular they do not contain Morse quasigeodesics, and they are not quasi-isometric to Gromov's monsters arising from graphical small cancellation labellings of expanders. Moreover, by further studying the divergence function, we show that there are uncountably many quasi-isometry classes of random Gromov's monsters.
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math.GR 1years
2019 1verdicts
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Controlled Analytic Properties and the Quantitative Baum-Connes Conjecture
The classical Baum-Connes assembly map is quantitatively an isomorphism for lacunary hyperbolic groups containing large-girth graph sequences in their Cayley graphs.