A new two--parameter family of isomonodromic deformations over the five punctured sphere

Arnaud Girand (1)

1 IRMAR - Institut de Recherche Mathématique de Rennes

The object of this paper is to describe an explicit two--parameter family of logarithmic flat connections over the complex projective plane. These connections have dihedral monodromy and their polar locus is a prescribed quintic composed of a circle and three tangent lines. By restricting them to generic lines we get an algebraic family of isomonodromic deformations of the five--punctured sphere. This yields new algebraic solutions of a Garnier system. Finally, we use the associated Riccati one--forms to construct an interesting non--generic family of transversally projective Lotka--Volterra foliations.

Domaines: Variables complexes [math.CV]; Géométrie algébrique [math.AG]

Arnaud Girand. A new two--parameter family of isomonodromic deformations over the five punctured sphere. 2015. ⟨hal-01176199v1⟩