Noncommutative minimal model conjecture for Fano varieties

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Let XX be a smooth Fano variety. Write τ∈H∙(X)\tau\in {\mathrm H}^\bullet(X) for a quantum-cohomology parameter, let S⊂C∗\mathscr{S}\subset\mathbf{C}^* be a sector, and let Stab⁡(X)\operatorname{Stab}(X) denote the space of stability conditions on XX. For the Euler operator \cEτ⋆τ(−)\cE_\tau\star_\tau(-), write σ(\cEτ)\sigma(\cE_\tau) for its multiset of eigenvalues and ∣σ(\cEτ)∣\lvert\sigma(\cE_\tau)\rvert for the underlying set. A path σt,φτ=(\cZteiφτ,\cPt,φ)\sigma_{t,\varphi}^\tau=(\cZ_{te^{\mathtt{i}\varphi}}^\tau,\cP_{t,\varphi}) is called quasi-convergent when it has the limiting behavior specified in the source.

Noncommutative minimal model conjecture. For any smooth Fano variety XX, there exist τ∈H∙(X)\tau\in {\mathrm H}^\bullet(X), a sector S⊂C∗\mathscr{S}\subset\mathbf{C}^*, ϵ>0\epsilon>0, and a map

S∩{z∈C∗:∣z∣<ϵ}⟶Stab⁡(X)\mathscr{S}\cap\{z\in\mathbf{C}^*:\lvert z\rvert<\epsilon\}\longrightarrow\operatorname{Stab}(X)

such that, for an open dense set of {φ∈R:R>0⋅eiφ⊂S}\{\varphi\in\mathbf{R}:\mathbf{R}_{>0}\cdot e^{\mathtt{i}\varphi}\subset\mathscr{S}\}, there is a quasi-convergent path σt,φτ\sigma_{t,\varphi}^\tau in Stab⁡(X)\operatorname{Stab}(X) defined as t→0t\to0. Moreover, the induced semiorthogonal decomposition is

Dcohb⁡(X)=⟨\cDλ:λ∈∣σ(\cEτ)∣⟩.\operatorname{D^b_{coh}}(X)=\langle\cD_\lambda:\lambda\in\lvert\sigma(\cE_\tau)\rvert\rangle.

The ordering on ∣σ(\cEτ)∣\lvert\sigma(\cE_\tau)\rvert is given by λ<μ\lambda<\mu if Im⁡(−e−iφμ)>Im⁡(−e−iφλ)\operatorname{Im}(-e^{-\mathtt{i}\varphi}\mu)>\operatorname{Im}(-e^{-\mathtt{i}\varphi}\lambda), and limit semistable objects E∈\cDλE\in\cD_\lambda satisfy the asymptotic estimates specified in the source.

This conjecture proposes a categorical lift of the A-model mutation system from smooth Fano complete intersections to all smooth Fano varieties, with the semiorthogonal components indexed by the eigenvalues of the quantum Euler operator and arising from quasi-convergent paths in the stability manifold.

References

Primary source

Tomohiro Karube, Antonios-Alexandros Robotis and Vanja Zuliani, “Toward the noncommutative minimal model program for Fano varieties”, arXiv:2601.20739 (2026).

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