On the universality of fluctuations for the cover time
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2022
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| _version_ | 1866908779836080128 |
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| author | Berestycki, Nathanaël Hermon, Jonathan Teyssier, Lucas |
| author_facet | Berestycki, Nathanaël Hermon, Jonathan Teyssier, Lucas |
| contents | We consider random walks on finite vertex-transitive graphs $Γ$ of bounded degree. We find a simple geometric condition which characterises the cover time fluctuations: the suitably normalised cover time converges to a standard Gumbel variable if and only if $\mathrm{Diam}(Γ)^2 = o(n/\log n)$, where $n = |Γ|$. We prove that this condition is furthermore equivalent to the decorrelation of the uncovered set. The arguments rely on recent breakthroughs by Tessera and Tointon on finitary versions of Gromov's theorem on groups of polynomial growth, which we leverage into strong heat kernel bounds, and refined quantitative estimates on Aldous and Brown's exponential approximation of hitting times, which are of independent interest. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2202_02255 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | On the universality of fluctuations for the cover time Berestycki, Nathanaël Hermon, Jonathan Teyssier, Lucas Probability Group Theory Metric Geometry We consider random walks on finite vertex-transitive graphs $Γ$ of bounded degree. We find a simple geometric condition which characterises the cover time fluctuations: the suitably normalised cover time converges to a standard Gumbel variable if and only if $\mathrm{Diam}(Γ)^2 = o(n/\log n)$, where $n = |Γ|$. We prove that this condition is furthermore equivalent to the decorrelation of the uncovered set. The arguments rely on recent breakthroughs by Tessera and Tointon on finitary versions of Gromov's theorem on groups of polynomial growth, which we leverage into strong heat kernel bounds, and refined quantitative estimates on Aldous and Brown's exponential approximation of hitting times, which are of independent interest. |
| title | On the universality of fluctuations for the cover time |
| topic | Probability Group Theory Metric Geometry |
| url | https://arxiv.org/abs/2202.02255 |