Recognition: unknown
Probing bulk geometry via pole skipping: from static to rotating spacetimes
Pith reviewed 2026-05-10 11:08 UTC · model grok-4.3
The pith
Pole-skipping data from the boundary fully reconstructs the metric of three-dimensional rotating black holes.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
We investigate an analytical framework for reconstructing bulk geometries from pole-skipping data. Previously, this method enabled the recursive recovery of near-horizon metric derivatives in static, planar-symmetric black holes. Building on this framework, we systematically extend it to more intricate geometries, specifically static topological black holes and rotating black holes. For three-dimensional rotating black holes, we demonstrate that the metric can be fully reconstructed from boundary pole-skipping data. For four-dimensional rotating spacetimes admitting a separable coordinate system such as the Kerr family, standard near-horizon pole-skipping successfully reconstructs the purely
What carries the argument
Pole-skipping, consisting of the locations and residues of poles in the boundary Green's function that encode near-horizon (and, in the new extension, near-axis) metric expansions; the algebraic map from these data to the metric components is the central mechanism.
If this is right
- The vacuum Einstein equations reduce to a closed set of algebraic equations among the pole-skipping locations and residues.
- The null energy condition appears as a set of algebraic inequalities that the boundary pole data must satisfy.
- Because the reconstruction is overdetermined, the pole data must obey an infinite family of polynomial identities.
- For any four-dimensional spacetime with a separable coordinate system the radial and angular metric functions can be recovered independently.
Where Pith is reading between the lines
- Boundary observables alone may suffice to determine the geometry of rotating black holes in holographic settings without first solving the bulk field equations.
- Angular pole-skipping supplies a concrete bulk-side definition that could be matched to a specific rotating-sector boundary correlator in future work.
- The same algebraic reconstruction procedure should apply to any spacetime whose metric admits a near-horizon or near-axis Taylor expansion, including charged or higher-dimensional cases.
Load-bearing premise
The near-horizon and near-axis series expansions of the metric functions contain enough information to solve uniquely for all components once the pole locations and residues are known.
What would settle it
Compute the pole-skipping data for a known rotating black-hole solution such as BTZ or Kerr, reconstruct the metric via the algorithm, and check whether the reconstructed functions agree with the original metric to all orders in the expansions.
read the original abstract
We investigate an analytical framework for reconstructing bulk geometries from pole-skipping data. Previously, this method enabled the recursive recovery of near-horizon metric derivatives in static, planar-symmetric black holes. Building on this framework, we systematically extend it to more intricate geometries, specifically static topological black holes and rotating black holes. For three-dimensional rotating black holes, we demonstrate that the metric can be fully reconstructed from boundary pole-skipping data. For four-dimensional rotating spacetimes admitting a separable coordinate system (such as the Kerr family), standard near-horizon pole-skipping successfully reconstructs the purely radial metric functions. To recover the remaining angular metric functions, we introduce a mathematical counterpart termed "angular pole-skipping," defined via a near-axis analysis. Although its precise holographic dictionary remains an open question, this bulk-side formalism completes the geometric reconstruction algorithm. Furthermore, we demonstrate that the vacuum Einstein equations can be recast as a set of algebraic equations governing the pole-skipping data and that the null energy condition imposes algebraic inequalities on this boundary data. Finally, we establish general polynomial constraints dictated by the overdetermined nature of the metric reconstruction, highlighting the highly redundant encoding of bulk geometry in boundary data.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript extends the pole-skipping reconstruction framework from static planar black holes to static topological black holes and rotating black holes. It claims that for three-dimensional rotating black holes the full metric can be recovered from boundary pole-skipping data; for four-dimensional separable rotating spacetimes (e.g., Kerr) standard near-horizon pole-skipping recovers the radial metric functions while a newly introduced near-axis “angular pole-skipping” formalism is proposed for the angular functions, although the precise holographic dictionary for the latter is left open. The paper further recasts the vacuum Einstein equations as algebraic relations on the pole-skipping data, derives null-energy-condition inequalities, and identifies polynomial constraints arising from the overdetermined character of the reconstruction.
Significance. If the central claims are substantiated, the work is significant because it enlarges the domain of pole-skipping reconstruction to rotating geometries of direct physical interest and supplies an algebraic reformulation of Einstein’s equations in terms of boundary data. The explicit demonstration for three-dimensional cases and the identification of redundancy constraints are concrete strengths. The bulk-side angular formalism provides a well-defined mathematical counterpart even while the dictionary remains open.
major comments (2)
- [Abstract] Abstract: the statement that “this bulk-side formalism completes the geometric reconstruction algorithm” for four-dimensional rotating spacetimes is not supported. The text explicitly notes that the precise holographic dictionary for angular pole-skipping remains an open question; consequently the angular metric functions are not shown to be determined by boundary observables. This directly affects the central claim that the metric can be reconstructed from pole-skipping data in the 4D separable case.
- [Section on three-dimensional rotating black holes] Section discussing three-dimensional rotating black holes: the claim of full metric reconstruction from boundary data is presented without explicit derivations, error estimates, or direct comparison to a known solution (e.g., the BTZ metric). The abstract summarizes the result but supplies no calculational steps or verification, leaving the load-bearing demonstration uncheckable.
minor comments (2)
- [Introduction] The notation distinguishing pole-skipping locations, residues, and the newly introduced angular quantities should be introduced with explicit reference to the definitions used in the prior static framework.
- A brief table or diagram contrasting the near-horizon and near-axis expansions for a concrete example (e.g., Kerr) would improve readability of the angular-pole-skipping construction.
Simulated Author's Rebuttal
We thank the referee for the careful reading of our manuscript and for the positive assessment of its significance in extending pole-skipping reconstruction to rotating geometries. We address the two major comments point by point below, agreeing where clarification is needed and proposing targeted revisions to strengthen the presentation without altering the core results.
read point-by-point responses
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Referee: [Abstract] Abstract: the statement that “this bulk-side formalism completes the geometric reconstruction algorithm” for four-dimensional rotating spacetimes is not supported. The text explicitly notes that the precise holographic dictionary for angular pole-skipping remains an open question; consequently the angular metric functions are not shown to be determined by boundary observables. This directly affects the central claim that the metric can be reconstructed from pole-skipping data in the 4D separable case.
Authors: We agree that the abstract wording is imprecise and could be read as claiming a complete boundary-to-bulk reconstruction for the angular sector in 4D, which is not yet demonstrated. The manuscript already states that the holographic dictionary for angular pole-skipping is open; the new formalism only supplies the bulk-side mathematical counterpart. We will revise the abstract to state that the bulk-side algorithm is completed while the dictionary for angular functions remains an open question, thereby removing any implication that full reconstruction from boundary data is achieved for the angular part. This is a clarification rather than a change to the technical content. revision: yes
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Referee: [Section on three-dimensional rotating black holes] Section discussing three-dimensional rotating black holes: the claim of full metric reconstruction from boundary data is presented without explicit derivations, error estimates, or direct comparison to a known solution (e.g., the BTZ metric). The abstract summarizes the result but supplies no calculational steps or verification, leaving the load-bearing demonstration uncheckable.
Authors: The section on three-dimensional rotating black holes contains the step-by-step reconstruction of the metric components from the pole-skipping data, including the algebraic relations that recover the full BTZ-like metric. To improve verifiability as requested, we will expand the section with an explicit worked example comparing the reconstructed functions directly to the known BTZ metric, including the intermediate calculational steps. Since the reconstruction is analytic and exact, formal error estimates are not applicable, but we will add a brief discussion of the uniqueness of the solution. These additions will make the demonstration self-contained and directly checkable against the referee's suggestion. revision: yes
Circularity Check
Minor self-citation in extending prior pole-skipping framework; reconstruction claims remain independent of inputs
full rationale
The paper extends an earlier framework for static planar black holes to rotating cases via explicit near-horizon expansions and a newly defined near-axis analysis. The 3D full-reconstruction and 4D radial-function results are derived directly from pole-skipping locations, residues, and the Einstein equations recast as algebraic constraints, without reducing to parameter fits or self-referential definitions. The angular sector is introduced as a bulk-side mathematical counterpart with its holographic dictionary explicitly left open, so no claim of boundary-data reconstruction is made for that part. The single prior-framework citation is not load-bearing for the new derivations and does not create a self-citation chain that forces the outcomes.
Axiom & Free-Parameter Ledger
axioms (2)
- domain assumption The metric admits a near-horizon expansion whose coefficients are recursively determined by pole-skipping data.
- domain assumption Vacuum Einstein equations can be recast as algebraic equations on the pole-skipping numbers.
invented entities (1)
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angular pole-skipping
no independent evidence
Reference graph
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discussion (0)
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