Quantum Riemannian limit conjecture for collapsing CFTs
Consider the collapsing family of unitary conformal field theories described above, with the minimal eigenvalue of the non-negative operator . Rescale by . A quantum Riemannian -space is the noncommutative geometric limit object defined in the source, and denotes the stated curvature-dimension inequality for its limiting operator. Quantum Riemannian limit conjecture. After this rescaling, there is a limit of the unitary CFTs in the sense of the source's topology, which is a quantum Riemannian -space, such that the limiting operator obtained from satisfies . This conjecture predicts that collapsed CFTs admit noncommutative Riemannian limits with non-negative Ricci curvature in the curvature-dimension sense; the source gives no resolution.
References
Primary source
Yan Soibelman, “Moduli space of Conformal Field Theories and non-commutative Riemannian geometry”, arXiv:2506.00896 (2025).
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