The local cohomology conjecture for additive Okamoto–Painlevé pairs

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Let (S,Y)(S,Y) be a generalized rational Okamoto–Painlevé pair of non-fibered type, let D=YredD=Y_{\mathrm{red}} be a normal crossing divisor with at least two irreducible components, and suppose that DD is of additive type. Write ND=OS(D)/OSN_D={\cal O}_S(D)/{\cal O}_S. The preceding theorem gives

dim⁡H0(D,ΘS(−log⁡D)⊗ND)=1.\dim H^0\left(D,\Theta_S(-\log D)\otimes N_D\right)=1.

Local cohomology conjecture. Under these assumptions,

HD1(ΘS(−log⁡D))≃H0(D,ΘS(−log⁡D)⊗ND)≃C.H^1_D\left(\Theta_S(-\log D)\right)\simeq H^0\left(D,\Theta_S(-\log D)\otimes N_D\right)\simeq {\bold C}.

The conjecture would identify the local cohomology space governing the deformation with the one-dimensional space of sections appearing in the theorem, strengthening the known natural inclusion and the resulting lower bound on its dimension. Its resolution is not specified in the source.

References

Primary source

Masa-Hiko Saito, Taro Takebe and Hitomi Terajima, “Deformation of Okamoto-Painlevé Pairs and Painlevé equations”, arXiv:math/0006026 (2000).

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