{"total":22,"items":[{"citing_arxiv_id":"2607.01351","ref_index":83,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Wigner negativity in Krylov space and emergent semiclassicality","primary_cat":"hep-th","submitted_at":"2026-07-01T18:09:10+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Wigner negativity in Krylov space stays O(1) or grows as t^{1/2} (without Hilbert-space scaling) in 2d CFTs, one-cut matrix models, and double-scaled SYK, indicating emergent semiclassicality.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.10924","ref_index":17,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Spacetime from Operator Algebras","primary_cat":"hep-th","submitted_at":"2026-06-09T14:31:02+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Reconstructs spacetime metric, curvature, and Einstein equations from matter field operator algebras in the G to 0 limit without using Bekenstein-Hawking area law, then models finite-N discrete spectra via random matrix completion of enlarged type III algebras.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2606.09344","ref_index":97,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Quantum Reference Fields Transformations in Linearized Quantum Gravity","primary_cat":"gr-qc","submitted_at":"2026-06-08T11:08:38+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Extends quantum reference frames to quantum reference fields in linearized quantum gravity and derives unitary maps implementing relational gauge-invariant observables between quantum perspectives.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2605.30423","ref_index":31,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Spectral Admissibility of Real Observers in Euclidean de Sitter Gravity","primary_cat":"hep-th","submitted_at":"2026-05-28T18:00:03+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"The paper introduces a form-domain criterion and proves a sufficiency theorem that identifies which gapped observer sectors remain semiclassically admissible in Euclidean de Sitter gravity on the sphere.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2605.13956","ref_index":87,"ref_count":4,"confidence":0.9,"is_internal_anchor":false,"paper_title":"q-Askey Deformations of Double-Scaled SYK","primary_cat":"hep-th","submitted_at":"2026-05-13T18:00:01+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":7.0,"formal_verification":"none","one_line_summary":"q-Askey deformations of DSSYK produce transfer matrices from basic orthogonal polynomials whose chord numbers map to ER bridge lengths and signal geometric transitions with discrete spectra in sine dilaton gravity.","context_count":2,"top_context_role":"method","top_context_polarity":"use_method","context_text":"Tr ˆρ = log⟨ω|ˆρ|ω⟩−⟨ω|ˆρlog ˆρ|ω⟩ ⟨ω|ˆρ|ω⟩, (4.37) whereˆρis not necessarily normalised; one can choose to normalise it⟨ω|ˆρ|ω⟩= 1to simplify the above expression asTr(ˆρlog ˆρ). 28Note that the algebra trace is defined to recover finite expectation values for trace class operators in the algebra, while the Hilbert space trace would lead to a generically diverging answer [87, 88]. - 62 - Given that|Ψ⟩(4.36) is a pure global state, it follows thatS(ˆρL) =S(ˆρR). This means that (4.37) corresponds to entanglement entropy between the algebrasˆAL and ˆAR for a given chord state. For this reason, we will denote (4.37) asalgebraic entanglement entropy. The aboveargumentsaremodel-independent; (4.37)corresponds toentanglemententropybetween"},{"citing_arxiv_id":"2605.13576","ref_index":1,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Semiclassical algebraic reconstruction for type III algebras","primary_cat":"hep-th","submitted_at":"2026-05-13T14:10:23+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Semiclassical crossed product constructions extend the algebraic reconstruction theorem to type III algebras and yield an algebraic Ryu-Takayanagi formula for holographic duality.","context_count":1,"top_context_role":"method","top_context_polarity":"use_method","context_text":"quantumfieldtheoryisduetothefactthatthetheoryisdescribedbyatypeIII 1 algebra[14- 17], which does not admit a well-defined notion of von Neumann entropy [18]. Nevertheless, ithasbeendemonstratedthatinaquantumtheorycoupledtogravity, oneisabletoperform an algebraic transition from a type III1 algebra to a type II∞ algebra, which does admit a well-defined von Neumann entropy, via the crossed product construction [1, 2, 19-21]. Such construction is extensively used in black hole physics where under certain geometric constraints, the generalized entropy and the generalized second law are formalized in the algebraic language [3, 6, 7]. See also [8, 22-34] for a incomplete list of relevant developments regarding algebraic approach in gravity. In the context of the AdS/CFT correspondence [35-37], which conjectures an equiv-"},{"citing_arxiv_id":"2605.06780","ref_index":68,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"A Semiclassical Diagnostic for Spacetime Emergence","primary_cat":"hep-th","submitted_at":"2026-05-07T18:00:02+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Evanescent quantum extremal surfaces, bounded in area but not generalized entropy, diagnose failures of spacetime emergence in holography.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"In the code picture this was because we wanted perturbation theory at all orders in 1/N, and not just leading order, to emerge in the effective description. In order to make this point precise, one would need to understand how to formulate convergence to perturbation theory in the algebraic approach to AdS/CFT. Some steps towards this goal were undertaken in [68]. 4.Observer rules.We want to highlight that our discussion of spacetime emer- gence in the presence of an observer does not currently have a clear formulation in the context of the largeNlimit. It would be very interesting to understand what the analogue of the observer rules of [13, 59] is from the point of view of the boundary theory, see [22, 26-28, 69] for proposals based on various forms of"},{"citing_arxiv_id":"2605.02792","ref_index":29,"ref_count":2,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Albertian Channel Memory in Black-Hole Evaporation","primary_cat":"hep-th","submitted_at":"2026-05-04T16:35:01+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":3.0,"formal_verification":"none","one_line_summary":"An Albert algebra description of the horizon yields a Volterra memory law on the Reissner-Nordstrom evaporation trajectory whose spectral overlap reconstructs the Page curve envelope without restoring standard AMPS tensor factorization.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Staffans,Volterra Integral and Functional Equations(Cambridge Univer- sity Press, Cambridge, 1990). [26] K. Papadodimas and S. Raju, J. High Energy Phys.2013 (10), 212, arXiv:1211.6767 [hep-th]. [27] K. Papadodimas and S. Raju, Phys. Rev. D93, 084049 (2016), arXiv:1503.08825 [hep-th]. [28] D. Harlow, J. High Energy Phys.2014(11), 055, arXiv:1405.1995 [hep-th]. [29] E. Witten, J. High Energy Phys.2022(10), 008, arXiv:2112.12828 [hep-th]. [30] K. Jensen, J. Sorce, and A. J. Speranza, J. High Energy Phys.2023(12), 020, arXiv:2306.01837 [hep-th]. [31] T. Faulkner and A. J. Speranza, J. High Energy Phys. 2024(11), 099, arXiv:2405.00847 [hep-th]. [32] S.D.Mathur,ClassicalandQuantumGravity26,224001 (2009), arXiv:0909."},{"citing_arxiv_id":"2604.02228","ref_index":49,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Gravitational null rays: Covariant Quantization and the Dressing Time","primary_cat":"hep-th","submitted_at":"2026-04-02T16:22:27+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":8.0,"formal_verification":"none","one_line_summary":"Gravitational null rays are quantized in a diffeomorphism-covariant way using the gravitational dressing time as quantum reference frame, producing a Virasoro crossed-product algebra of gauge-invariant observables.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"Entropy II: The complete symmetry group and edge modes, (2026), [2601.07910]. [47] J. Kudler-Flam, S. Leutheusser, and G. Satishchandran,Generalized black hole entropy is von Neumann entropy, Phys. Rev. D111.2 (2025), 025013, [2309.15897]. [48] T. Faulkner and A. J. Speranza,Gravitational algebras and the generalized second law, JHEP 11 (2024), 099, [2405.00847]. [49] E. Witten, Gravity and the crossed product, JHEP 10 (2022), 008, [2112.12828]. [50] S. Ali Ahmad, W. Chemissany, M. S. Klinger, and R. G. Leigh,Quantum reference frames from top-down crossed products, Phys. Rev. D110.6 (2024), 065003, [2405.13884]. [51] S. Ali Ahmad and R. Jefferson,Crossed product algebras and generalized entropy for subregions,"},{"citing_arxiv_id":"2603.25990","ref_index":62,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Implication of dressed form of relational observable on von Neumann algebra","primary_cat":"hep-th","submitted_at":"2026-03-27T00:29:08+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":4.0,"formal_verification":"none","one_line_summary":"Dressed relational observables imply quasi-de Sitter space corresponds to Type II_∞ von Neumann algebra with diverging trace in the gravity decoupling limit, unlike the finite-trace Type II_1 algebra for de Sitter space.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2602.06113","ref_index":209,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Deforming the Double-Scaled SYK & Reaching the Stretched Horizon From Finite Cutoff Holography","primary_cat":"hep-th","submitted_at":"2026-02-05T19:00:00+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Deformations of the double-scaled SYK model via finite-cutoff holography produce Krylov complexity as wormhole length and realize Susskind's stretched horizon proposal through targeted T² deformations in the high-energy spectrum.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"where ˆO(L/R) ∆ are matter chord operators. Moreover, we know thatAL/R is a type II1 algebra [59], where the|Ω⟩is the cyclic separating state in both the deformed and seed theories. This allows us to define traces Tr ( ˆwL/R ) =⟨Ω|ˆwL/R|Ω⟩,∀ˆwL/R∈AL/R .(5.2) - 36 - We may then define the density matrix inˆρL/R∈AL/R associated to a state|Ψ⟩∈Hchord as [209] Tr ( ˆρL/R ˆwL/R ) =⟨Ψ|ˆwL/R|Ψ⟩,∀ˆwL/R∈AL/R ,(5.3) Next, from the Gelfand-Naimark-Segal construction [218, 219], we can express any state in the chord Hilbert space by applying a string of the operators in the double-scaled algebras to the cyclic separating state, |ψ⟩=f ( ˆHL/R,y, ˆO(L/R) ∆ ) |Ω⟩∈Hchord ,(5.4) wherefis a generic function, then combining (5."},{"citing_arxiv_id":"2512.11754","ref_index":10,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Modular Witten Diagrams and Quantum Extremality","primary_cat":"hep-th","submitted_at":"2025-12-12T18:05:09+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Modular Witten diagrams reproduce the O(λ² G_N) correction to holographic entanglement entropy, matching the canonical energy term in the quantum Ryu-Takayanagi formula with wedge shape deformation.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2512.10101","ref_index":6,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"The von Neumann algebraic quantum group $\\mathrm{SU}_q(1,1)\\rtimes \\mathbb{Z}_2$ and the DSSYK model","primary_cat":"math-ph","submitted_at":"2025-12-10T21:46:07+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":8.0,"formal_verification":"none","one_line_summary":"The DSSYK model emerges as the dynamics on the quantum homogeneous space of the von Neumann algebraic quantum group SU_q(1,1) ⋊ Z2.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2511.03779","ref_index":141,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Cosmological Entanglement Entropy from the von Neumann Algebra of Double-Scaled SYK & Its Connection with Krylov Complexity","primary_cat":"hep-th","submitted_at":"2025-11-05T19:00:00+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Algebraic entanglement entropy from type II1 algebras in double-scaled SYK is matched via triple-scaling limits to Ryu-Takayanagi areas in (A)dS2, reproducing Bekenstein-Hawking and Gibbons-Hawking formulas for specific regions while depending on Krylov complexity of the Hartle-Hawking state.","context_count":1,"top_context_role":"background","top_context_polarity":"support","context_text":"the von Neumann algebra of the DSSYK model, and its bulk interpretation, we are prompted to examine the question What are the first principles to define entanglement entropy based on the double- scaled algebras of the DSSYK model? Does it have a bulk interpretation? Aims and Results in This WorkWe will show one can define a density matrix associated to each of the relevant algebra of observables from a global pure state [141]. Given that the double-scaled algebras are commutants of each other [136], the von Neumann entropies of the density matrices associated to a given state in the chord Hilbert space for each algebra are equal to each other. Thus, we can define a notion of algebraic entanglement entropy,4 and discuss their bulk interpretation. In this work, we are particularly interested in the high"},{"citing_arxiv_id":"2511.01978","ref_index":24,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Single-Sided Black Holes in Double-Scaled SYK Model and No Man's Island","primary_cat":"hep-th","submitted_at":"2025-11-03T19:00:04+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"In the double-scaled SYK model with an end-of-the-world brane, the boundary algebra for a single-sided black hole is a type II1 von Neumann factor with non-trivial commutant, preventing full bulk reconstruction and creating a no man's island behind the horizon.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2510.20902","ref_index":40,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Searching for emergent spacetime in spin glasses","primary_cat":"hep-th","submitted_at":"2025-10-23T18:00:41+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Spectral functions of SYK, p-spin, and SU(M) Heisenberg models show exponential tails in spin-glass phases and quasiparticle families in spin-liquid phases, with a proof that exponential decay blocks detection of bulk causal structure.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2509.01458","ref_index":20,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Quantum reference frames for spacetime symmetries and large gauge transformations","primary_cat":"gr-qc","submitted_at":"2025-09-01T13:19:33+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"Applies operational quantum reference frames to obtain type reduction for QFT algebras and to quantize boundary electric fluxes with gluing for quantum electromagnetism on spacetimes with boundaries.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2508.13283","ref_index":6,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Algebraic traversable wormholes","primary_cat":"hep-th","submitted_at":"2025-08-18T18:01:02+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"Proposes a new large N limit dual to back-reacted traversable wormholes via algebra-at-infinity operators and algebraically reproduces the Maldacena-Stanford-Yang result on left-right observer effects.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2507.20983","ref_index":9,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Fiducial observers and the thermal atmosphere in the black hole quantum throat","primary_cat":"hep-th","submitted_at":"2025-07-28T16:45:02+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":6.0,"formal_verification":"none","one_line_summary":"A semiclassical construction of fiducial observers in JT gravity, fixed by conformal isometry flow, is extended to the quantum regime to compute wormhole contributions yielding finite thermal entropy and a quantum description of the stretched horizon.","context_count":1,"top_context_role":"background","top_context_polarity":"background","context_text":"special role played by conformal isometries in the connection between geometric flow-that is, the one-parameter family of diffeomorphisms generated by flow under a vector field in spacetime-and modular flow, which is a rather abstract concept from the theory of op- erator algebras [30, 31] that has been central in many recent breakthroughs in quantum field theory and quantum gravity [9, 10, 32-34]. We thus view the results presented here as constituting compelling evidence for a gravitational dressing in JT gravity that gener- alizes the notion of local bulk observers beyond the semiclassical regime, in a way that is consistent with the recent developments on von Neumann algebras in quantum gravity. 1.1 Outline of the paper The paper is organized as follows."},{"citing_arxiv_id":"2503.19342","ref_index":24,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Timelike entanglement entropy Revisited","primary_cat":"hep-th","submitted_at":"2025-03-25T04:27:36+00:00","verdict":"UNVERDICTED","verdict_confidence":"LOW","novelty_score":5.0,"formal_verification":"none","one_line_summary":"An operator-algebraic definition of timelike entanglement entropy in QFT is shown to be real-valued via the timelike tube theorem.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2403.09021","ref_index":68,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"Von Neumann Algebras in Double-Scaled SYK","primary_cat":"hep-th","submitted_at":"2024-03-14T01:02:28+00:00","verdict":null,"verdict_confidence":null,"novelty_score":null,"formal_verification":null,"one_line_summary":null,"context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null},{"citing_arxiv_id":"2206.10780","ref_index":26,"ref_count":1,"confidence":0.9,"is_internal_anchor":false,"paper_title":"An Algebra of Observables for de Sitter Space","primary_cat":"hep-th","submitted_at":"2022-06-22T00:22:20+00:00","verdict":"ACCEPT","verdict_confidence":"MODERATE","novelty_score":7.0,"formal_verification":"none","one_line_summary":"Defines a Type II₁ algebra of gravitationally dressed observables in de Sitter static patch whose entropy matches generalized entropy up to a state-independent additive constant.","context_count":0,"top_context_role":null,"top_context_polarity":null,"context_text":null}],"limit":50,"offset":0}