Prime-shift operators on Bj\"orner's complex of squarefree integers: spectral obstruction, kernel correction, and a Hankel--ESPRIT pipeline for the Guinand--Weil explicit formula

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Authors

Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-09-16
DOI
https://doi.org/10.5281/zenodo.22800826
Primary Topic
Advanced Algebra and Geometry
Type
preprint
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preprint

Prime-shift operators on Bj\"orner's complex of squarefree integers: spectral obstruction, kernel correction, and a Hankel--ESPRIT pipeline for the Guinand--Weil explicit formula

Luca Eliseo Pavesi
Zenodo (CERN European Organization for Nuclear Research)
Advanced Algebra and Geometry
preprint

Prime-shift operators on Bj\"orner's complex of squarefree integers: spectral obstruction, kernel correction, and a Hankel--ESPRIT pipeline for the Guinand--Weil explicit formula

Luca Eliseo Pavesi
preprint en

Abstract

Let \(\Delta_{n}\) denote Bj\"orner's simplicial complex on the squarefree integers \(m\leq n\) and let \(H_{n} = \sum_{p\leq n}c_{p}(T_{p} + T_{p}^{*})\) be the self-adjoint operator obtained from the prime-shift operators \(T_{p}\) with bounded weights \(c_{p}\). We present a revised and corrected analysis of \(H_{n}\) and of the Toeplitz pencil constructed from the Guinand--Weil explicit formula. Three groups of results. First, we confirm the structural properties of \(H_{n}\): self-adjointness, \(\mathbb{Z}/2\)-symmetric spectrum, the trace formula \(\operatorname{Tr}(H_{n}^{2}) = 2\sum_{p\leq n}c_{p}^{2}\sigma_{p}(n/p)\), and Carleman uniqueness of the limiting measure. Second, we correct two statements of the earlier version: the Mertens invariant is the \emph{index} of the bipartite block \(A\), not the signature of \(H_{n}\) (which vanishes by symmetry); and the kernel of the up-shift part \(A_{\uparrow}\) restricted to \(C_{1}\) has dimension \(\pi(n)-\pi(n/2)\), which is strictly larger than \(\dim(\ker H_{n}\cap C_{1})\). Third, we revisit the Toeplitz pencil for the explicit formula and prove that the prefactor of the prime-power term is \(1/(8\pi\sigma\sqrt{\pi})\), not \(1/(4\sigma\sqrt{\pi})\) as recorded in the erratum of the previous version. We verify the corrected identity numerically against the direct sum over the first 500 nontrivial zeros, with relative error below \(10^{-6}\) for \(0\le \Delta\le 3\). We prove an exact-recovery theorem for the pencil and verify it numerically with error \(10^{-14}\) on synthetic data. We then present a Hankel-ESPRIT pipeline built from the corrected formula and show that it recovers the first \(12\) nontrivial zeros of \(\zeta\) with relative error below \(10^{-2}\), with a ratio of extracted frequencies to effective zeros equal to \(1.02\). The previous numerical claim of \(1839\) matched zeros is \emph{not} reproduced with the corrected prefactor; we discuss this discrepancy and identify three structural bottlenecks (aliasing, effective rank, and truncation of the prime-power sum) that separate the low-lying regime from the scaling regime. No proof of the Riemann Hypothesis is claimed.

Zenodo (CERN European Organization for Nuclear Research)
Advanced Algebra and Geometry
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