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Gravitational sound waves in Schwarzschild-de Sitter spacetimes carry chaotic pole-skipping signatures at both horizons, and the resulting butterfly velocities—one superluminal for small black holes, one imaginary at the cosmological horizo

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Pole-skipping in Schwarzschild-de Sitter predicts superluminal and imaginary butterfly velocities, confirmed by shock wave analysis, hinting at nonlocal and non-Hermitian dual dynamics.

T0 review reviewed 2026-08-05 challenge →

load-bearing objection Systematic and useful, but the central sound-mode pole-skipping derivation is not reproducible as printed; the shock wave part may carry the paper. the 2 major comments →

arxiv 2508.15589 v2 pith:Q2JKPYLY submitted 2025-08-21 hep-th gr-qc

Cosmological pole-skipping, shock waves and quantum chaotic dynamics of de Sitter horizons

Yongjun Ahn , Sa\v{s}o Grozdanov , Hyun-Sik Jeong , Juan F. Pedraza This is my paper
classification hep-th gr-qc MSC 83C5783F0581T20
keywords pole-skippingde Sitter spaceSchwarzschild-de Sitter black holesbutterfly velocityLyapunov exponentshock wavesquantum chaosholography
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper studies pole-skipping, the points in complex frequency-momentum space where a bulk two-point function becomes 0/0, for scalar, Maxwell, and gravitational perturbations around empty de Sitter space and Schwarzschild-de Sitter (SdS) black holes. Its central target is the gravitational sound channel, where a chaotic pole-skipping point appears at ω = 2πTi at both the black-hole and cosmological horizons. Reading that point through the standard holographic chaos dictionary gives Lyapunov exponents that saturate the chaos bound at each horizon, λ = 2πT, and butterfly velocities v_B² = 2πT_bh/((d−1)r_bh) at the black hole and v_B² = −2πT_c/((d−1)r_c) at the cosmological horizon. The same velocities follow from an independent gravitational shock-wave computation, which is the paper's evidence that pole-skipping encodes genuine high-energy horizon scattering. If a holographic dual exists, these numbers imply a dual split into two entangled sectors: a black-hole sector that becomes increasingly nonlocal as the black hole shrinks, and a cosmological sector suggestive of non-Hermitian dynamics.

Core claim

The paper's central claim is that in Schwarzschild-de Sitter spacetimes, the gravitational sound channel has a chaotic pole-skipping point at ω = 2πT_bh i at the black-hole horizon and at ω = 2πT_c i at the cosmological horizon, and that these points encode butterfly velocities v²_B,bh = 2πT_bh/((d−1)r_bh) and v²_B,c = −2πT_c/((d−1)r_c). The same velocities are reproduced by an independent gravitational shock-wave calculation, confirming that the pole-skipping points encode high-energy scattering of horizon quanta. The paper also locates the full leading tower of pole-skipping points for scalar, Maxwell, and gravitational perturbations at each horizon, and checks the leading de Sitter pole-s

What carries the argument

The load-bearing object is the leading 'chaotic' pole-skipping point of the gravitational sound channel, located in the upper-half complex-frequency plane at ω = +2πTi, with wave number fixed by the vanishing of a near-horizon determinant. The near-horizon Frobenius method, in both its original and matrix formulations, supplies the locations; the butterfly velocity is read off from v_B² = ω²/k² at that point. The matching shock-wave computation uses the near-horizon shift equation (∂_θ² ∓ m²)h = source with m² = 2π(d−1)Tr, whose exponential decay at the black-hole horizon and oscillatory behavior at the cosmological horizon give the same v_B². This dual route—pole-skipping and shock waves—is

Load-bearing premise

The load-bearing premise is that the pole-skipping/OTOC dictionary proven for anti-de Sitter black holes applies unchanged to de Sitter horizons, so that the upper-half-plane pole-skipping point really encodes a Lyapunov exponent and butterfly velocity of a hypothetical dual theory; if no such dual exists, those 'velocities' are only algebraic combinations of horizon data.

What would settle it

Take a concrete candidate dual, a DSSYK-type chain with power-law hoppings 1/|j−k|^α in the range 1 < α < 2, and compute the retarded energy two-point function or the OTOC: the pole-skipping point at ω = +2πTi should sit at the momentum predicted by v_B(α), and the chaos front should spread at that speed; if the front stays finite as α → 1+ or the pole-skipping momentum disagrees, the identification fails. On the gravity side, a numerical evolution of a null shock in SdS can directly measure the decay (black hole) or oscillation (cosmological) length of the shift h(θ); it should equal [2π(d−1)

Watch this falsifier. Get emailed when new claim-graph text bears on it.

If this is right

  • Both horizons saturate the chaos bound: λ_L = 2πT_bh at the black-hole horizon and λ_L = 2πT_c at the cosmological horizon.
  • The black-hole butterfly velocity grows without bound as the black hole mass decreases, so a holographic dual would have to become increasingly nonlocal for small black holes.
  • The cosmological butterfly velocity has a negative square, so the dual chaos has no causal butterfly cone and its spatial profile oscillates rather than forming a sharp front.
  • Pole-skipping and shock-wave analyses give identical Lyapunov exponents and butterfly velocities at both horizons, tying pole-skipping points to high-energy horizon scattering.
  • Long-range and parity-time-broken double-scaled SYK-type chains reproduce the superluminal and imaginary butterfly velocities while keeping the Lyapunov exponent maximal.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • If the dictionary is right, the imaginary cosmological butterfly velocity predicts that out-of-time-ordered correlation functions oscillate in space rather than decay, a signature that could be searched for in static-patch correlators or in SYK-type quantum simulators with parity-time-broken hopping.
  • The two-sector purification picture suggests that mutual information between black-hole and cosmological horizon degrees of freedom should grow during scrambling; this is a testable prediction for concrete proposals of de Sitter duals.
  • The divergence of v_B as the black hole shrinks ties the mass dependence of chaos to the approach to empty de Sitter space, so the M → 0 limit may involve a nonlocal operator-growth law rather than a smooth transition.
  • The long-range hopping exponent α acts as a dial for the effective Lieb-Robinson velocity, so cold-atom or ion-trap SYK-type chains could calibrate α against gravitational predictions for the butterfly velocity.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

2 major / 4 minor

Summary. The paper studies pole-skipping in empty de Sitter space and in Schwarzschild–de Sitter black holes, for probe scalar, Maxwell, and gravitational perturbations. For the gravitational sound channel it finds a chaotic pole-skipping point at ω = 2π i T at both the black-hole and cosmological horizons, and uses it to assign Lyapunov exponents and butterfly velocities to a hypothetical dual theory. The butterfly velocities from pole-skipping are shown to agree with a shock-wave calculation, and the paper interprets the two horizons as two entangled sectors, with the black-hole sector becoming nonlocal for small black holes and the cosmological sector exhibiting an imaginary butterfly velocity. Simple DSSYK-type chain toy models are proposed as microscopic realizations.

Significance. If the central derivation is correct, the paper provides the first systematic pole-skipping catalogue for de Sitter and Schwarzschild–de Sitter horizons, including the gravitational sound channel, and a coherent shock-wave match. The imaginary and superluminal butterfly velocities are interesting, falsifiable signatures that could constrain future dS holographic constructions. The paper is appropriately conditional about the existence of a holographic dual, and the toy models are clearly labelled as schematic. The main weakness is that the central sound-mode derivation is not fully reproducible as printed, which must be fixed before the headline result can be assessed.

major comments (2)
  1. [§3.4.1, Eqs. (3.57)–(3.60)] The displayed λ=0 eigenvector in Eq. (3.59) does not satisfy the advertised pole-skipping condition at the chaotic point. At ω=2πiT the denominator 2 r0^2 ω (2πiT − ω) vanishes, while the numerator evaluates to ±2π r0 T ± i k_S^2/(d−1) (depending on sign choices), which cannot vanish for real k_S^2. Equation (3.60) nevertheless quotes real values k_S^2 = ∓2(d−1)π r0 T. This is likely a typo (the first numerator term may be ∓ r0 ω rather than ∓ i r0 ω), but because the 2×2 matrix M in Eq. (3.57) is omitted, the derivation is not reproducible and Eq. (4.14), the paper's headline result, is not verified as printed. Please provide M, or the corrected first-order system, and recompute the eigenvalues and eigenvectors explicitly.
  2. [§4.2–4.3] The shock-wave analysis does not provide an independent confirmation of the pole-skipping interpretation, because both calculations are interpreted through the same AdS/CFT chaos dictionary (Eq. (4.10) and the OTOC form (4.35)). The agreement is an internal consistency check of the bulk data, not a test of the dS holographic dictionary. The abstract and conclusions state that the results 'precisely match ... confirming that the relevant pole-skipping points encode high-energy scattering'; this overstates what has been shown. I recommend adding an explicit caveat and, if feasible, testing the dictionary in a tractable dS model where OTOCs can be computed independently, such as dS JT gravity or a DSSYK-type model.
minor comments (4)
  1. [§3.4.1] The sentence 'For brevity, we omit the explicit form of M' appears exactly where reproducibility is most needed. At minimum, the matrix M should be included in an appendix.
  2. [Eq. (3.60)] The k_S,1 entries are typeset as a two-row object, but the closing bracket or parenthesis is missing, making the expression difficult to parse.
  3. [§4.4.2, Eq. (4.60)] The definition of A_α has unbalanced parentheses; the fraction structure is ambiguous and should be clarified.
  4. [§4.4.2] The derivation of Λ(k) in Eq. (4.56) and v_B in Eq. (4.61) is sketched rather than derived. Since the toy model section is advertised as a concrete arena, please provide the ladder-kernel eigenvalue calculation or a more detailed reference to the derivation.

Circularity Check

0 steps flagged

No demonstrated circularity: the pole-skipping and shock-wave butterfly velocities are independent bulk computations sharing an explicitly assumed holographic dictionary; the flagged verifiability gap in the printed sound-mode derivation (Eqs. 3.57-3.60) is a correctness issue, not a circular reduction.

full rationale

No significant circularity. Score 2 reflects minor, non-load-bearing self-citations and the internal-consistency (rather than externally validating) character of the pole-skipping/shock-wave agreement; the central bulk computations are self-contained. The sound-mode pole-skipping data (3.59)-(3.60) and the shock-wave profile (4.28)-(4.31, 4.34-4.39) are each derived from the SdS background by standard near-horizon and Einstein-equation methods; neither computation fits a parameter to the other's output, and the butterfly velocities (4.14) are the algebraic consequences v_B^2 = ω^2/k^2 of the stated holographic chaos dictionary (4.10), which the paper explicitly adopts as a 'working definition' (Sec. 4.2) and applies conditionally ('Assuming that a holographic dual exists', Abstract). The dictionary is therefore an acknowledged assumption, not a concealed input, and its extension to dS is not forced by a self-citation. The agreement between the two bulk diagnostics is a meaningful internal consistency check; because both extractions use the same AdS/CFT dictionary, the Abstract's 'confirming' wording somewhat overstates independence, but this is not a reduction by construction. The toy models (Secs. 4.4.2-4.4.3) are explicitly built to reproduce the superluminal/imaginary v_B features and are presented as toy models, not predictions, so their reverse-engineering is not circular. Flagged per review rules: the printed derivation of the headline point is incomplete — the 2x2 matrix M in (3.57) is omitted ('For brevity, we omit the explicit form of M'), and the displayed λ=0 eigenvector (3.59) is inconsistent with the advertised point (3.60): at ω=2πiT its numerator is ±2πr0T ± i k_S^2/(d-1), which vanishes only for imaginary k_S^2, not for the real quoted values, so the 0/0 pole-skipping condition is not satisfied as written. This is a verifiability/correctness gap in the central claim, not a demonstrated circular reduction; it is weighed here as a serious concern (if (3.60) were merely planted to match Sec. 4.3, the 'confirmation' would be circular, but nothing in the text shows that and a typo is plausible). Self-citations ([41], [74], [76], [115], [131]-[132], [181], [205]) are numerous but corroborative; load-bearing anchors ([42], [44], [113], [135], [141]) are external.

Axiom & Free-Parameter Ledger

0 free parameters · 5 axioms · 0 invented entities

The central bulk calculations use no fitted parameters; the only inputs are the spacetime geometry and standard field equations. The main assumptions are the holographic dictionary for dS and the mapping of the toy models to the bulk. No new particles, forces, or dimensions are introduced.

axioms (5)
  • domain assumption Existence of a holographic dual for de Sitter space and validity of the pole-skipping/OTOC chaos dictionary.
    Invoked in Section 4.2 (Eq. 4.10) and Section 4.3 to translate bulk pole-skipping and shock wave data into a Lyapunov exponent and butterfly velocity of a dual quantum theory.
  • domain assumption Ingoing boundary conditions at both the black hole and cosmological horizons define the relevant bulk correlators.
    Section 3.1 introduces Eddington-Finkelstein coordinates with v+ for r_bh and v- for r_c, and selects the ingoing mode. This is a standard assumption but could affect the pole-skipping locations.
  • standard math The near-horizon Frobenius analysis gives the full set of pole-skipping points.
    Section 3.1 reviews the matrix method and the alternative first-order approach; these are standard techniques in the pole-skipping literature.
  • domain assumption The shock wave profile near the horizon encodes the OTOC of the dual theory in the same way as in AdS/CFT.
    Section 4.3 imports the eikonal shock wave computation from AdS to dS, equating the profile h(x) with exp(lambda_L(t - |x|/v_B)).
  • ad hoc to paper DSSYK chain models with long-range or non-Hermitian hoppings capture the essential physics of the dS dual.
    Sections 4.4.2 and 4.4.3 construct toy models specifically designed to reproduce the superluminal and imaginary butterfly velocities; these are not derived from the bulk.

reviewed 2026-08-05 · how reviews work

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Cite this review

Pith. "Pith review of Cosmological pole-skipping, shock waves and quantum chaotic dynamics of de Sitter horizons." pith.science (2026). https://pith.science/paper/Q2JKPYLY

@misc{pith2026250815589,
  author       = {Pith},
  title        = {Pith review of: Cosmological pole-skipping, shock waves and quantum chaotic dynamics of de Sitter horizons},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/Q2JKPYLY}},
  note         = {Machine review of arXiv:2508.15589}
}
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read the original abstract

We present a systematic analysis of pole-skipping for scalar, Maxwell, and gravitational waves in cosmological spacetimes. Specifically, working in empty de Sitter space and in Schwarzschild-de Sitter black hole geometries, we locate the tower of pole-skipping points of such fields and show that they impose nontrivial constraints on the corresponding bulk two-point functions. Focusing on the gravitational sound channel, we then extract the Lyapunov exponent and butterfly velocities that characterize hypothetical dual many-body quantum chaos at each horizon. These chaotic data precisely match the outcome of a gravitational shock wave calculation, confirming that the relevant pole-skipping points encode high-energy scattering of horizon quanta. Interestingly, the butterfly velocities can become superluminal or imaginary, with the latter signaling a spatially modulated propagation of chaos. Assuming that a holographic dual exists, we translate our results into field theory language and propose that the dual theory can be divided into two entangled sectors that capture the black hole and cosmological horizon degrees of freedom. Our results suggest that the black hole sector becomes increasingly nonlocal as the black hole shrinks and that the cosmological horizon sector exhibits behavior compatible with violations of Hermiticity. Finally, we outline simple microscopic toy models, built from long-range and non-Hermitian deformations of the Double Scaled Sachdev-Ye-Kitaev (DSSYK)-type chains, that realize these features, providing a concrete arena for future exploration.

discussion (0)

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This paper was first reviewed by deepseek-v4-flash on August 5, 2026.