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Convergence of Spectral Triples on Fuzzy Tori to Spectral Triples on Quantum Tori

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Abstract

Fuzzy tori are finite dimensional C*-algebras endowed with an appropriate notion of noncommutative geometry inherited from an ergodic action of a finite closed subgroup of the torus, which are meant as finite dimensional approximations of tori and more generally, quantum tori. A mean to specify the geometry of a noncommutative space is by constructing over it a spectral triple. We prove in this paper that we can construct spectral triples on fuzzy tori which, as the dimension grows to infinity and under other natural conditions, converge to a natural spectral triple on quantum tori, in the sense of the spectral propinquity. This provides a formal assertion that indeed, fuzzy tori approximate quantum tori, not only as quantum metric spaces, but as noncommutative differentiable manifolds—including convergence of the state spaces as metric spaces and of the quantum dynamics generated by the Dirac operators of the spectral triples, in an appropriate sense.

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  1. Department of Mathematics, University of Denver, Denver, CO, 80208, USA

    Frédéric Latrémolière

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  1. Frédéric Latrémolière
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Correspondence to Frédéric Latrémolière.

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Latrémolière, F. Convergence of Spectral Triples on Fuzzy Tori to Spectral Triples on Quantum Tori. Commun. Math. Phys. 388, 1049–1128 (2021). https://doi.org/10.1007/s00220-021-04173-0

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