The analytic bootstrap at finite temperature
Pith reviewed 2026-05-22 01:00 UTC · model grok-4.3
The pith
A dispersion relation in complex time fixes thermal two-point functions of scalar operators up to an additive constant.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
We propose new universal formulae for thermal two-point functions of scalar operators based on their analytic structure, constructed to manifestly satisfy all the bootstrap conditions. We derive a dispersion relation in the complexified time plane, which fixes the correlator up to an additive constant and theory-dependent dynamical information. At non-zero spatial separation we introduce a formula for the thermal two-point function obtained by summing over images of the dispersion relation result obtained in the OPE regime. This construction satisfies all thermal bootstrap conditions, with the exception of clustering at infinite distance, which must be verified on a case-by-case basis. We t
What carries the argument
Dispersion relation in the complexified time plane combined with summation over images of the OPE-regime result
Load-bearing premise
Clustering at infinite distance must be verified separately on a case-by-case basis rather than following automatically from the construction.
What would settle it
A mismatch between the predicted thermal two-point function of the energy operator in the 3d Ising model and independent Monte Carlo simulation data.
read the original abstract
We propose new universal formulae for thermal two-point functions of scalar operators based on their analytic structure, constructed to manifestly satisfy all the bootstrap conditions. We derive a dispersion relation in the complexified time plane, which fixes the correlator up to an additive constant and theory-dependent dynamical information. At non-zero spatial separation we introduce a formula for the thermal two-point function obtained by summing over images of the dispersion relation result obtained in the OPE regime. This construction satisfies all thermal bootstrap conditions, with the exception of clustering at infinite distance, which must be verified on a case-by-case basis. We test our results both in weakly and strongly-coupled theories. In particular, we show that the asymptotic behavior for the heavy sector proposed in~\cite{Marchetto:2023xap} and its correction can be explicitly derived from the dispersion relation. We combine analytical and numerical results to compute the thermal two-point function of the energy operator in the $3d$ Ising model and find agreement with Monte Carlo simulations.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript proposes new universal formulae for thermal two-point functions of scalar operators based on their analytic structure in the complexified time plane. A dispersion relation is derived that fixes the correlator up to an additive constant and dynamical input. For nonzero spatial separation, the thermal two-point function is constructed by summing images of the OPE-regime result. The construction is stated to satisfy all thermal bootstrap conditions except clustering at infinite distance, which requires case-by-case verification. The formulae are tested in weakly and strongly coupled theories, the heavy-sector asymptotics are derived, and the energy operator two-point function in the 3d Ising model is computed and compared to Monte Carlo data.
Significance. If the results hold, the work offers a concrete advance in the analytic bootstrap at finite temperature by supplying explicit expressions for thermal correlators that incorporate bootstrap constraints by construction. The explicit reproduction of known limits, the derivation of heavy-operator asymptotics directly from the dispersion relation, and the agreement with Monte Carlo simulations for the 3d Ising energy operator are clear strengths that illustrate the method's reach across perturbative and non-perturbative regimes.
major comments (1)
- [Abstract and §3] Abstract and §3: The central construction is presented as satisfying all thermal bootstrap conditions except clustering at infinite spatial distance, which must be verified case-by-case. Because the image sum is the key step that extends the dispersion relation to nonzero spatial separation, and because clustering is a load-bearing bootstrap condition, an explicit check that the large-r limit of the summed expression approaches the product of one-point functions should be reported for the 3d Ising energy operator (or a general criterion supplied) to confirm that the formula solves the full bootstrap problem without additional input.
Simulated Author's Rebuttal
We thank the referee for their careful reading of the manuscript and for the constructive suggestion regarding the clustering condition. We address the major comment below and have revised the manuscript accordingly to include the requested explicit verification.
read point-by-point responses
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Referee: [Abstract and §3] Abstract and §3: The central construction is presented as satisfying all thermal bootstrap conditions except clustering at infinite spatial distance, which must be verified case-by-case. Because the image sum is the key step that extends the dispersion relation to nonzero spatial separation, and because clustering is a load-bearing bootstrap condition, an explicit check that the large-r limit of the summed expression approaches the product of one-point functions should be reported for the 3d Ising energy operator (or a general criterion supplied) to confirm that the formula solves the full bootstrap problem without additional input.
Authors: We agree that an explicit check of the clustering condition for the image sum is a useful addition, particularly given its role in extending the construction to nonzero spatial separation. In the revised manuscript we have added a new paragraph in §3 that explicitly analyzes the large-r limit of the summed expression for the energy operator in the 3d Ising model. We show that the contributions from images at large spatial distances decay such that the correlator approaches the square of the one-point function, consistent with clustering. This limit is derived directly from the structure of the image sum and the dispersion relation; it is further supported by the existing numerical results, which already agree with Monte Carlo data at large separations and exhibit the expected approach to the product of one-point functions. We have also included a short general remark on why the image-sum construction inherits clustering from the underlying dispersion relation under the stated assumptions, thereby confirming that the formulae solve the full set of bootstrap conditions for the cases considered without additional dynamical input. revision: yes
Circularity Check
No significant circularity: derivation from independent analyticity assumptions with external validation
full rationale
The paper derives a dispersion relation in the complexified time plane directly from analyticity assumptions, which fixes the correlator up to an additive constant and dynamical input from the OPE regime; this step is independent of the final proposed formulae. At nonzero spatial separation the thermal two-point function is obtained by an explicit image-sum construction of the OPE-regime result to enforce periodicity. The resulting object is stated to satisfy the thermal bootstrap conditions by manifest construction, with the single acknowledged exception of clustering at infinite distance (which is left for case-by-case verification rather than being smuggled in). The self-citation to Marchetto:2023xap is used only to show that a prior heavy-sector asymptotic follows from the new dispersion relation, not as load-bearing justification for the central claim. Independent tests in weakly and strongly coupled theories plus Monte Carlo comparison for the 3d Ising energy operator supply external benchmarks, confirming that the derivation chain remains self-contained and does not reduce to its inputs by definition or self-citation.
Axiom & Free-Parameter Ledger
axioms (2)
- domain assumption The thermal two-point function is analytic in the complex time plane except for physical cuts.
- domain assumption The OPE holds in the regime used to derive the zero-separation result.
Lean theorems connected to this paper
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IndisputableMonolith/Foundation/ArithmeticFromLogic.leanLogicNat recovery and orbit embedding unclear?
unclearRelation between the paper passage and the cited Recognition theorem.
We derive a dispersion relation in the complexified time plane, which fixes the correlator up to an additive constant and theory-dependent dynamical information. At non-zero spatial separation we introduce a formula for the thermal two-point function obtained by summing over images of the dispersion relation result obtained in the OPE regime.
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Forward citations
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discussion (0)
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