2026/07/07 by Vibhor Bhatt, Satyajit Guin, Bipul Saurabh
#math.OA
We investigate the lifting of quantum Gromov-Hausdorff convergence through Toeplitz type C^*-algebra extensions by stable ideals in the framework of noncommutative metric geometry. Working with the spectral metric space construction of Hawkins and Zacharias (Comm. Math. Phys. 350 (2017), 475-506), we consider a sequence of complete sub-operator systems of the quotient or the unital C^*-algebra underlying the stable ideal, converging in the quantum Gromov-Hausdorff distance. We study whether this induces a corresponding convergent sequence of complete sub-operator systems of the extension. To address this problem, we construct complete sub-operator systems of the extension associated with those of the quotient and the unital C^*-algebra underlying the stable ideal. We also introduce the notion of unital 2-contractive approximation together with its Toeplitz type refinement to provide the compatibility required by the commutator structure of the Dirac operator on the extension. We prove that, under this approximation hypothesis on the convergent sequence in the quotient or the unital C^*-algebra underlying the stable ideal, quantum Gromov-Hausdorff convergence lifts to the extension.