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arXiv · 2404.16338

Multiple operator integrals, pseudodifferential calculus, and asymptotic expansions

Eva-Maria Hekkelman·Edward McDonald·Teun D. H. van Nuland
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Abstract

We push the definition of multiple operator integrals (MOIs) into the realm of unbounded operators, using the pseudodifferential calculus from the works of Connes and Moscovici, Higson, and Guillemin. This in particular provides a natural language for operator integrals in noncommutative geometry. For this purpose, we develop a functional calculus for these pseudodifferential operators. To illustrate the power of this framework, we provide a pertubative expansion of the spectral action for regular $s$-summable spectral triples $(\mathcal{A}, \mathcal{H}, D)$, and an asymptotic expansion of $\mathrm{Tr}(P e^{-t(D+V)^2})$ as $t \downarrow 0$, where $P$ and $V$ belong to the algebra generated by $\mathcal{A}$ and $D$, and $V$ is bounded and self-adjoint.

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Eva-Maria Hekkelman, Edward McDonald, Teun D. H. van Nuland. 2024-04-25. Multiple operator integrals, pseudodifferential calculus, and asymptotic expansions. https://arxiv.org/abs/2404.16338

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