The exponential type conjecture for quantum t-connections

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Let (X,comega)(X,comega) be a closed monotone symplectic manifold of dimension 2n2n, with [comega]=c1(X)[comega]=c_1(X). Let tt be a formal variable of degree 22, and let

∇∂∂tQH:=∂∂t+μt−c1⋆t2\nabla^{QH}_{\frac{\partial}{\partial t}}:=\frac{\partial}{\partial t}+\frac{\mu}{t}-\frac{c_1\star}{t^2}

be the quantum tt-connection on H∗(X;C)[[t]]H^*(X;\mathbb{C})[[t]], where μ∣Hk(X)=k−n2\mu|_{H^k(X)}=\frac{k-n}{2} and ⋆\star is the small quantum cup product. The exponential type conjecture. The quantum tt-connection (H∗(X;C)((t)),∇∂∂tQH)(H^*(X;\mathbb{C})((t)),\nabla^{QH}_{\frac{\partial}{\partial t}}) admits a finite direct sum decomposition

∇∂∂tQH=⨁λ(C((t)),∂∂t−λt2)⊗∇∂∂treg,λ,\nabla^{QH}_{\frac{\partial}{\partial t}}=\bigoplus_{\lambda}(\mathbb{C}((t)),\frac{\partial}{\partial t}-\frac{\lambda}{t^2})\otimes \nabla^{reg,\lambda}_{\frac{\partial}{\partial t}},

where λ∈C\lambda\in\mathbb{C} and each ∇∂∂treg,λ\nabla^{reg,\lambda}_{\frac{\partial}{\partial t}} is gauge equivalent to a connection with simple poles at t=0t=0 and monodromies given by roots of unity. Equivalently, the quantum connection has unramified exponential type and quasi-unipotent regularized monodromy. This conjecture concerns the singularity and monodromy structure of quantum connections; the source paper proves it for closed monotone symplectic manifolds, while the general conjecture is attributed to Katzarkov–Kontsevich–Pantev and Galkin–Golyshev–Iritani.

References

Primary source

Zihong Chen, “On the exponential type conjecture”, arXiv:2409.03922 (2024).

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