Vladimirov–Pearson operators on ζ$\zeta$‐regular ultrametric Cantor sets

Patrick Erik Bradley

Mathematische Nachrichten, 2025, vol. 298, issue 12, 3779-3790

Abstract: A new operator for certain types of ultrametric Cantor sets is constructed using the measure coming from the spectral triple associated with the Cantor set, as well as its zeta function. Under certain mild conditions on that measure, it is shown that it is an integral operator similar to the Vladimirov–Taibleson operator on the p$p$‐adic integers. Its spectral properties are studied, and the Markov property and kernel representation of the heat kernel generated by this so‐called Vladimirov–Pearson operator is shown, viewed as acting on a certain Sobolev space. A large class of these operators have a heat kernel and a Green function explicitly given by the ultrametric wavelets on the Cantor set, which are eigenfunctions of the operator.

Date: 2025
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