Foliations on the moduli space of rank two connections on the projective line minus four points

Details Foliations on the moduli space of rank two connections on the projective line minus four points Foliations on the moduli space of rank two connections on the projective line minus four points

2010-12-16

arxiv.org/abs/1012.3612v2

Mathematics

Algebraic Geometry

Scientific paper

We look at natural foliations on the Painlev\'e VI moduli space of regular connections of rank 2 on $\pp ^1 -{t_1,t_2,t_3,t_4}$. These foliations are fibrations, and are interpreted in terms of the nonabelian Hodge filtration, giving a proof of the nonabelian Hodge foliation conjecture in this case. Two basic kinds of fibrations arise: from apparent singularities, and from quasiparabolic bundles. We show that these are transverse. Okamoto's additional symmetry, which may be seen as Katz's middle convolution, exchanges the quasiparabolic and apparent-singularity foliations.

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