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Spectral Inversion of Modular Hamiltonians via Non-Commutative Kolmogorov Complexity: Unitary Information Retrieval in Type III1 Holographic Operator Algebras

Zen Revista, 10 MFC

Published Dec 30, 2025• 0 citations
Publisher

Abstract

Mathematical Applications of Science Fiction We present a rigorous derivation of the spectral inversion map for modular Hamiltonians within the framework of Type III von Neumann algebras, particularly those arising in the algebraic formulation of holographic field theories. By introducing a measure of Non-Commutative Kolmogorov Complexity defined on the predual space of the operator algebra, we establish a direct correspondence between the algorithmic information content of a quantum state and the spectral density of its associated modular operator. We prove that the reconstruction of bulk operators from boundary data is formally equivalent to a spectral inversion problem subject to an algorithmic entropy bound. To this end, we construct the Valerius–Kolmogorov Operator, a unitary mapping that retrieves information from the island regions of the entanglement wedge by inverting the modular flow. We provide detailed proofs of the existence, uniqueness, and stability of this inversion, showing that unitary information retrieval is possible precisely when the complexity growth of the modular flow is subexponential. This framework resolves the trans-temporal information leakage paradox in black hole evaporation models by interpreting Hawking radiation as a complexity-encoded modular scramble.

DOI
10.5281/zenodo.18099782

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Mathematical Applications of Science Fiction We present a rigorous derivation of the spectral inversion map for modular Hamiltonians within the framework of Type III von Neumann algebras, particularly those arising in the algebraic formulation of holographic field theories. By introducing a measure of Non-Commutative Kolmogorov Complexity defined on the predual space of the operator algebra, we establish a direct correspondence between the algorithmic information content of a quantum state and the spectral density of its associated modular operator. We prove that the reconstruction of bulk operators from boundary data is formally equivalent to a spectral inversion problem subject to an algorithmic entropy bound. To this end, we construct the Valerius–Kolmogorov Operator, a unitary mapping that retrieves information from the island regions of the entanglement wedge by inverting the modular flow. We provide detailed proofs of the existence, uniqueness, and stability of this inversion, showing that unitary information retrieval is possible precisely when the complexity growth of the modular flow is subexponential. This framework resolves the trans-temporal information leakage paradox in black hole evaporation models by interpreting Hawking radiation as a complexity-encoded modular scramble.
Mathematical Applications of Science Fiction We present a rigorous derivation of a non-perturbative isomorphism between the asymptotic growth of quantum circuit complexity and the recoverability of information in scrambled quantum states, formulated within the framework of Type-III von Neumann algebras characteristic of local quantum field theories. By extending the Complexity equals Volume conjecture through Tomita–Takesaki modular theory, we construct a correspondence that links the geodesic length on the manifold of unitaries to the spectral properties of the modular Hamiltonian. We prove that the scrambling time corresponds to a phase transition in the Connes cocycle derivative, demonstrating that perfect information retrieval is dual to the saturation of the Lloyd bound. The work includes ten supporting lemmas and five main theorems, culminating in the Thorne–Reconstruction Theorem, which establishes that modular flow functions as a universal decoding mechanism for Hawking radiation in the infinite-N limit.
We develop a cohomological framework for entanglement entropy that unifies information theory, operator algebras, and noncommutative geometry. Entropy is a 1-cocycle in information cohomology; we generalize this to the quantum setting via Hochschild and cyclic cohomology. For an inclusion of von Neumann algebras N contained in M with a faithful normal state w admitting a cyclic and separating vector, and a conditional expectation E: M -> N (whose existence is equivalent to modular invariance of N by Takesaki's theorem), we construct the entanglement complex as the image of the transgression map tau_w on the relative cyclic complex, where A is a dense *-subalgebra of M and B = A intersect N. Our main result identifies entanglement cohomology with the kernel of the restriction map HC*(A) -> HC*(B), up to the connecting homomorphism d of the long exact sequence of the pair (A,B); when d = 0, the identification is exact. The relative modular cocycle u_t = (Dw : D(w|_N) o E)_t generates explicit entanglement classes when E is not w-invariant, with the Araki relative entropy as its infinitesimal generator. The framework accommodates Type III von Neumann algebras, where no local density matrix exists, and leads to a holographic proposal: a subspace of H^1_ent is conjecturally dual to linearized modular Hamiltonian perturbations of the bulk entanglement wedge. We verify the construction in finite-dimensional, type II_1, and type III_1 examples.
We show that the area operator of a quantum extremal surface can be reconstructed directly from boundary dynamics without reference to bulk geometry. Our approach combines the operator-algebra quantum error-correction (OAQEC) structure of AdS/CFT with modular Krylov complexity. Using Lanczos coefficients of boundary modular dynamics, we extract the spectrum of the modular Hamiltonian restricted to the algebra of the entanglement wedge and isolate its central contribution, which is identified with the area operator. The construction is purely boundary-based and applies to superpositions of semiclassical geometries as well. As an application, we diagnose island formation and the Page transition in evaporating black holes using boundary modular evolution alone, bypassing any bulk extremization. More broadly, our results establish modular Krylov complexity as a concrete and computable probe of emergent spacetime geometry, providing a new route to accessing black hole interiors from boundary quantum dynamics.
We examine the possibility of reconstructing quantum information emitted by an evaporating black hole using modular operator theory within an algebraic framework. This approach is based on the entanglement structure described by Tomita-Takesaki theory, without relying on a specific model of quantum gravity. In comparison with other solutions to the black hole information paradox (notably the "islands" approach and quantum errorcorrecting codes), our proposal aims to characterize the approximate localizability of interior black hole operators within the Hawking radiation. We also discuss conceptual limitations of this method and potential implementations via tensor networks.
The island proposal guarantees a unitary Page curve for evaporating black holes, implying that operators deep behind the horizon must be fully reconstructable from asymptotic Hawking radiation. However, because the interior is causally disconnected and highly dynamical, standard entanglement wedge reconstruction methods, relying on global isometries or continuous modular flow, fail to provide this mapping. We resolve this by constructing a protocol for island reconstruction using the algebraic Petz map. By using modular theory, we reflect island operators into the accessible complement, transport them to the boundary, and map them into the radiation algebra. Furthermore, we demonstrate that this purely algebraic derivation naturally yields the structure of Papadodimas-Raju mirror operators. This framework provides a rigorous operational dictionary for the island formula, proving that information trapped inside a black hole can be decoded.
In the context of quantum theories of spacetime, one overarching question is how quantum information in the bulk spacetime is encoded holographically in boundary degrees of freedom.It is particularly interesting to understand the correspondence between bulk subregions and boundary subregions in order to address the emergence of locality in the bulk quantum spacetime.For the AdS/CFT correspondence, it is known that this bulk information is encoded redundantly on the boundary in the form of an error-correcting code.Having access only to a subregion of the boundary is as if part of the holographic code has been damaged by noise and rendered inaccessible.In quantum-information science, the problem of recovering information from a damaged code is addressed by the theory of universal recovery channels.We apply and extend this theory to address the problem of relating bulk and boundary subregions in AdS/CFT, focusing on a conjecture known as entanglement wedge reconstruction.Existing work relies on the exact equivalence between bulk and boundary relative entropies, but these are only approximately equal in bulk effective field theory, and in similar situations it is known that predictions from exact entropic equalities can be qualitatively incorrect.We show that the framework of universal recovery channels provides a robust demonstration of the entanglement wedge reconstruction conjecture as well as new physical insights.Most notably, we find that a bulk operator acting in a given boundary region's entanglement wedge can be expressed as the response of the boundary region's modular Hamiltonian to a perturbation of the bulk state in the direction of the bulk operator.This formula can be interpreted as a noncommutative version of Bayes's rule that attempts to undo the noise induced by restricting to only a portion of the boundary.To reach these conclusions, we extend the theory of universal recovery channels to finite-dimensional operator algebras and demonstrate that recovery channels approximately preserve the multiplicative structure of the operator algebra.