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

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.

arXiv:2607.14220 [hep-th]

(or arXiv:2607.14220v2 [hep-th] for this version)

https://doi.org/10.48550/arXiv.2607.14220 Focus to learn more arXiv-issued DOI via DataCite

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