Non-perturbative saturation of Krylov complexity, and its implications in quantum gravity

• URL: http://arxiv.org/abs/2607.14220v1
• Date: Wed, 15 Jul 2026 18:00:27 GMT
• Title: Non-perturbative saturation of Krylov complexity, and its implications in quantum gravity
• Abstract summary: We study the dynamics of Krylov state complexity in finite-dimensional quantum systems.<n>This has interesting implications for the proposal that Krylov complexity is related to the wormhole length in 2D quantum gravity.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the dynamics of Krylov state complexity in finite-dimensional quantum systems. Orthogonal polynomials built on a discrete energy spectrum crowd away from regions where the density of states is low at large Krylov index. The physical implication of this result is that, even using a minimalist Krylov state complexity which is defined over the entire spectrum, the Krylov complexity provably stops growing a little past the Heisenberg length in every low-energy state. This has interesting implications for the proposal that Krylov complexity is related to the wormhole length in 2D quantum gravity.

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