Moduli Spaces in CFT: Large Charge Operators
Pith reviewed 2026-05-23 23:55 UTC · model grok-4.3
The pith
A CFT that breaks conformal symmetry while also breaking a continuous global symmetry on its moduli space must have a tower of charged operators whose dimensions grow linearly with charge.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
Using the large-charge expansion, we prove a necessary condition for a CFT to exhibit conformal symmetry breaking, under the assumption that a continuous global symmetry is also broken on the moduli space: there must be a tower of charged local operators whose scaling dimensions are asymptotically linear in the charge. In supersymmetric theories with a continuous R-symmetry and a holomorphic moduli space, the existence of such a tower of operators follows trivially from a BPS condition: their scaling dimensions are then exactly linear in the R-charge. We illustrate the more general statement in several examples of three-dimensional N=1 CFTs, where the leading linear behavior receives nontriv
What carries the argument
Large-charge expansion on the moduli space, which isolates the required tower of charged operators and relates their dimensions to the geometry of the broken-symmetry vacuum.
If this is right
- In supersymmetric theories the tower exists automatically and the linearity is exact by the BPS bound.
- In non-supersymmetric three-dimensional N=1 models the linear term is still present but receives nontrivial corrections that can be computed.
- A scaling limit maps the large-charge spectrum of local operators on the cylinder to the spectrum of massive particles on the moduli space.
- The condition supplies a diagnostic for the presence of a moduli space in any CFT that breaks both conformal and global symmetries.
Where Pith is reading between the lines
- The linear tower offers a spectral signature that could be searched for in lattice or bootstrap studies of candidate CFTs with broken symmetries.
- The cylinder-to-moduli-space map suggests that low-energy effective actions on the moduli space can be constrained directly by CFT data at large charge.
- Corrections to linearity in non-supersymmetric cases encode dynamical information about the metric and potential on the moduli space.
Load-bearing premise
A continuous global symmetry is also broken on the moduli space.
What would settle it
A concrete CFT that breaks conformal symmetry and breaks a continuous global symmetry on its moduli space, yet whose charged operators fail to show asymptotically linear scaling dimensions with charge.
read the original abstract
Using the large-charge expansion, we prove a necessary condition for a CFT to exhibit conformal symmetry breaking, under the assumption that a continuous global symmetry is ${\it also}$ broken on the moduli space: there must be a tower of charged local operators whose scaling dimensions are asymptotically linear in the charge. In supersymmetric theories with a continuous R-symmetry and a holomorphic moduli space, the existence of such a tower of operators follows trivially from a BPS condition: their scaling dimensions are then exactly linear in the R-charge. We illustrate the more general statement in several examples of three-dimensional ${\cal N}=1$ CFTs, where the leading linear behavior receives nontrivial corrections. By considering a suitable scaling limit, we also relate the spectrum of states with large charge on the cylinder (isomorphic to local operators) to the spectrum of massive particles on the moduli space.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript uses the large-charge expansion to prove a necessary condition for a CFT to exhibit conformal symmetry breaking on its moduli space, under the explicit assumption that a continuous global symmetry is also broken there: there must exist a tower of charged local operators whose scaling dimensions are asymptotically linear in the charge. In supersymmetric theories with a continuous R-symmetry and holomorphic moduli space the tower follows from the BPS condition. The claim is illustrated with examples of three-dimensional N=1 CFTs (where the leading linear term receives nontrivial corrections) and a scaling limit is used to relate the large-charge spectrum on the cylinder to the spectrum of massive particles on the moduli space.
Significance. If the central claim holds, the result supplies a concrete, testable link between the geometry of the moduli space and the asymptotic operator spectrum in CFTs. The explicit separation of the SUSY (BPS) case from the non-SUSY illustrations, together with the cylinder-to-moduli-space relation obtained via a controlled scaling limit, are concrete strengths that could be used to constrain possible patterns of symmetry breaking or to organize large-charge data in both supersymmetric and non-supersymmetric models.
minor comments (3)
- [Abstract] The abstract states that the non-SUSY examples receive 'nontrivial corrections' to the linear behavior; a brief indication of the functional form of the first correction (e.g., logarithmic or 1/Q) would help the reader assess how generic the leading linearity remains.
- The relation between cylinder states and moduli-space particles is obtained by 'a suitable scaling limit'; the precise limit (which charges or radii are sent to infinity, and in what ratio) should be stated explicitly in the main text so that the isomorphism can be reproduced.
- Notation for the global symmetry charge Q versus the R-charge in the SUSY section should be kept distinct throughout to avoid any momentary confusion when the two cases are compared.
Simulated Author's Rebuttal
We thank the referee for their positive assessment of the manuscript, including the summary and significance statements, and for recommending minor revision. No specific major comments were provided in the report.
Circularity Check
No significant circularity; derivation self-contained under stated assumption
full rationale
The central claim is a conditional necessary condition derived via the large-charge expansion under an explicitly flagged assumption (continuous global symmetry broken on moduli space). No equations or steps in the provided abstract reduce by construction to fitted parameters, self-definitions, or load-bearing self-citations; the SUSY case is noted as following from BPS (external to the non-SUSY illustrations), and the cylinder-moduli relation is presented as a separate scaling limit. The derivation chain therefore remains independent of its inputs.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption The large-charge expansion applies to the CFTs under consideration and yields the stated asymptotic behavior.
Reference graph
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