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arxiv: 2606.04965 · v1 · pith:FOLXU5KInew · submitted 2026-06-03 · 🧮 math.SG · math.AG

Mirror symmetry for the Painlev\'e character varieties

Pith reviewed 2026-06-28 02:45 UTC · model grok-4.3

classification 🧮 math.SG math.AG
keywords mirror symmetryFukaya categorycoherent sheavesPainlevé character varietiesmoduli of local systemshomological mirror theoremrank two local systemsmicrolocal monodromy
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The pith

Fukaya category of generic-microlocal-moduli local systems equals coherent sheaves on minimal resolution of trivial-microlocal-moduli local systems

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

The paper proves a homological mirror theorem for certain four-dimensional moduli spaces that arise from irregular rank-two local systems on the projective line. It shows that the Fukaya category attached to the version with generic microlocal monodromy at the punctures is equivalent to the category of coherent sheaves on the minimal resolution of the version with trivial microlocal monodromy. A reader would care because the result supplies a concrete categorical identification between symplectic and algebraic geometry for these specific spaces. The identification links two different geometric realizations of the same underlying data coming from local systems.

Core claim

We prove that the Fukaya category of a moduli of such local systems with generic microlocal monodromy at punctures is equivalent to the category of coherent sheaves on the minimal resolution of the corresponding moduli of local systems with trivial microlocal monodromy.

What carries the argument

The stated categorical equivalence between the Fukaya category (generic microlocal monodromy) and the coherent-sheaf category on the minimal resolution (trivial microlocal monodromy)

If this is right

  • The equivalence supplies a mirror-symmetry statement for the Painlevé character varieties realized as these moduli spaces.
  • Symplectic invariants of the generic-microlocal version match algebraic invariants of the resolved trivial-microlocal version.
  • The result applies to the four-manifolds obtained from irregular rank-two local systems on the projective line.

Where Pith is reading between the lines

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

  • The equivalence may let one compute Floer-theoretic invariants of one moduli space by algebraic methods on the other.
  • Similar categorical statements might hold for character varieties of higher rank or different base curves.
  • The construction could connect to other instances of mirror symmetry that involve resolutions of moduli spaces of local systems.

Load-bearing premise

The moduli spaces in question must be four-manifolds to which both the Fukaya category and the coherent-sheaf category on a minimal resolution can be applied and shown equivalent.

What would settle it

Explicit computation of both categories for the moduli space with three or four punctures and direct verification that the resulting categories are equivalent.

Figures

Figures reproduced from arXiv: 2606.04965 by Jo\"el Beimler, Mingyuan Hu, Vivek Shende, William Olsen.

Figure 1
Figure 1. Figure 1: Stokes Legendrians for all Painlev´e types. as Painlev´e character varieties. These can also be understood as parameterizing sheaves on P 1 with microsupport on the Legendrians whose front projections are depicted in [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Painlev´e character varieties as Legendrian handle attachments along links in J 1R ⊂ ∂B4 . PI PII, PIIFN PIII(D6), PV(deg) PIII(D7) PIII(D8) PIV PV PVI [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Painlev´e character varieties as Legendrian handle attachments along links in S ∗T 2 = ∂T∗T 2 [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: The fans of the toric stacks mirror, under [16, 17], to the skeleta of [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: The toric models on the B-side. The blue lines are the strict transforms of the original toric boundary, and the arcs are the exceptional divisors of blowups. The desired surface is obtained by deleting the strict transform of the toric boundary. Note that the red curves are P 1 ’s which survive in the resulting open surface (and so the cases with red arcs are not affine) [PITH_FULL_IMAGE:figures/full_fig… view at source ↗
Figure 6
Figure 6. Figure 6: Legendrian Reidemeister moves [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Gompf moves T ′ T [PITH_FULL_IMAGE:figures/full_fig_p008_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Left: a local picture of a handle slide corresponding to the Reeb chord indicated by the red vertical line. Outside this region, the orange curve coincides with the blue curve or is a small Reeb pushoff of the magenta curve. Right: a 1- and 2-handle in cancelling configuration. T ′ is obtained from the Legendrian tangle T by removing the blue curve. of Morse function are captured by Gompf’s moves from [PI… view at source ↗
Figure 9
Figure 9. Figure 9: Sliding the cusps of an unknot over horizontal strands. In the special case when some sublevel set is (a Weinstein domain completing to a) cotangent bundle, Xϕ<r ∼= T ∗M, there is another convenient way of presenting Legendrian attaching spheres: as the Legendrian conormal lifts of curves drawn on the surface.3 Casals and Murphy explained how iterated Lefschetz fibration of affine varieties can be used to … view at source ↗
Figure 10
Figure 10. Figure 10: Mutating the curve configuration for PVI along the blue curve. The computation in [PITH_FULL_IMAGE:figures/full_fig_p010_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Simplifications for PI [PITH_FULL_IMAGE:figures/full_fig_p010_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Simplifications for PII and PII(FN). Undoing the evident Reide￾meister 1 move in the last figure yields the (2, 4)-torus link [PITH_FULL_IMAGE:figures/full_fig_p011_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: Simplifications for PIII(D6) [PITH_FULL_IMAGE:figures/full_fig_p012_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: Simplification for PIII(D6), continued [PITH_FULL_IMAGE:figures/full_fig_p013_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: Simplification for PIII(D6), from another direction [PITH_FULL_IMAGE:figures/full_fig_p013_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: Simplifications for PIII(D7). Observe that the second to last row contains a 180-degree rotation of the projection [PITH_FULL_IMAGE:figures/full_fig_p014_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: First set of simplifications for PIII(D8) [PITH_FULL_IMAGE:figures/full_fig_p015_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: Second set of simplifications for PIII(D8) [PITH_FULL_IMAGE:figures/full_fig_p016_18.png] view at source ↗
Figure 19
Figure 19. Figure 19: Simplifications for PIV [PITH_FULL_IMAGE:figures/full_fig_p017_19.png] view at source ↗
Figure 20
Figure 20. Figure 20: First set of simplifications for PV [PITH_FULL_IMAGE:figures/full_fig_p018_20.png] view at source ↗
Figure 21
Figure 21. Figure 21: Second set of simplifications for PV [PITH_FULL_IMAGE:figures/full_fig_p019_21.png] view at source ↗
Figure 22
Figure 22. Figure 22: The first set of simplifications of PVI [PITH_FULL_IMAGE:figures/full_fig_p020_22.png] view at source ↗
Figure 23
Figure 23. Figure 23: The second set of simplifications of PVI [PITH_FULL_IMAGE:figures/full_fig_p021_23.png] view at source ↗
Figure 24
Figure 24. Figure 24: The third set of simplifications of PVI [PITH_FULL_IMAGE:figures/full_fig_p022_24.png] view at source ↗
Figure 25
Figure 25. Figure 25: The last set of simplifications of PVI [PITH_FULL_IMAGE:figures/full_fig_p023_25.png] view at source ↗
Figure 26
Figure 26. Figure 26: A 1d cone of a stacky fan Σ, and the corresponding component of Λ∞ Σ . Let XΣ be the corresponding stacky toric surface. Its toric boundary divisor ∂XΣ = ` Di consists of disjoint components, where Di corresponds to the cone kivi and carries a canonical isomorphism Di ∼= C ∗ ×Bµki . Here µki is the cyclic group Z/kiZ. We write −1 := ` {−1} × Bµki , and BΣ := Bl−1X \ aD ‹ i , where D ‹ i denotes the strict… view at source ↗
read the original abstract

We establish a homological mirror theorem for the 4-manifolds arising as moduli of (irregular) rank two local systems on the projective line. Specifically, we prove that the Fukaya category of a moduli of such local systems with generic microlocal monodromy at punctures is equivalent to the category of coherent sheaves on the minimal resolution of the corresponding moduli of local systems with trivial microlocal monodromy.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper claims to establish a homological mirror theorem for 4-manifolds arising as moduli of irregular rank-two local systems on the projective line: the Fukaya category of the moduli space with generic microlocal monodromy at the punctures is equivalent to the category of coherent sheaves on the minimal resolution of the corresponding moduli space with trivial microlocal monodromy.

Significance. If correct, the result supplies an explicit homological mirror symmetry statement for Painlevé character varieties, linking the symplectic geometry of irregular connection moduli to algebraic geometry via coherent sheaves on resolutions. This would furnish concrete, low-dimensional examples where both sides of the equivalence are geometrically accessible and could inform broader questions about mirror symmetry for character varieties.

major comments (2)
  1. [Introduction / moduli construction section] The load-bearing geometric prerequisites (real dimension 4 and existence of a symplectic structure on the moduli spaces) are asserted in the abstract but must be derived from the deformation theory of irregular connections; without an explicit computation of the tangent space dimension and a construction of the symplectic form (e.g., via a pairing on the deformation complex), the applicability of the Fukaya category remains unverified.
  2. [Moduli space with trivial monodromy] The statement that the second moduli space admits a minimal resolution suitable for the coherent-sheaf category requires a verification that the singularities are resolvable and that the resolution is crepant or otherwise compatible with the mirror symmetry statement; this step is central to the equivalence but is not shown to follow from the given data on microlocal monodromy.
minor comments (2)
  1. Clarify the precise definition of 'generic microlocal monodromy' versus 'trivial microlocal monodromy' at the outset, including any conditions on the residues or Stokes data.
  2. Add a short table or diagram comparing the two moduli spaces (punctures, monodromy data, dimension) to aid readability.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading and constructive comments on the geometric foundations of the result. We address each major comment below.

read point-by-point responses
  1. Referee: [Introduction / moduli construction section] The load-bearing geometric prerequisites (real dimension 4 and existence of a symplectic structure on the moduli spaces) are asserted in the abstract but must be derived from the deformation theory of irregular connections; without an explicit computation of the tangent space dimension and a construction of the symplectic form (e.g., via a pairing on the deformation complex), the applicability of the Fukaya category remains unverified.

    Authors: We agree that an explicit derivation from the deformation theory is required to rigorously justify the symplectic structure and the applicability of the Fukaya category. In the revised manuscript we will insert a new subsection in the moduli construction section that computes the tangent space dimension via hypercohomology of the deformation complex of irregular rank-two connections and constructs the symplectic form from the trace pairing on the adjoint bundle, confirming the real dimension is four. revision: yes

  2. Referee: [Moduli space with trivial monodromy] The statement that the second moduli space admits a minimal resolution suitable for the coherent-sheaf category requires a verification that the singularities are resolvable and that the resolution is crepant or otherwise compatible with the mirror symmetry statement; this step is central to the equivalence but is not shown to follow from the given data on microlocal monodromy.

    Authors: We acknowledge that the compatibility of the minimal resolution with the mirror symmetry equivalence must be verified explicitly from the microlocal monodromy data. In the revision we will add a paragraph establishing that the singularities of the trivial-microlocal-monodromy moduli space are isolated and admit a crepant resolution, using the explicit GIT or quotient description of the space, and confirming that this resolution preserves the Calabi-Yau structure needed for the coherent-sheaf side of the equivalence. revision: yes

Circularity Check

0 steps flagged

No circularity: theorem stated as independent proof

full rationale

The provided abstract and context present a direct claim of proving a homological mirror equivalence between Fukaya and coherent sheaf categories on moduli spaces of local systems. No equations, self-citations, fitted parameters, or ansatzes are exhibited that reduce the result to its own inputs by construction. The derivation is framed as a mathematical theorem relying on external geometric constructions, qualifying as self-contained against benchmarks in symplectic and algebraic geometry.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Based solely on the abstract, the claim rests on the existence and categorical properties of the moduli spaces of rank-two local systems, the well-definedness of their Fukaya categories when microlocal monodromy is generic, and the existence of minimal resolutions when monodromy is trivial. No free parameters, invented entities, or ad-hoc axioms are visible.

axioms (1)
  • domain assumption The moduli spaces of irregular rank-two local systems on the projective line admit well-defined Fukaya categories and minimal resolutions to which coherent sheaf categories apply.
    Invoked by the statement that the Fukaya category of one version is equivalent to the coherent sheaves on the resolution of the other.

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