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ALGEBRAIC ISOMONODROMIC DEFORMATIONS AND THE MAPPING CLASS GROUP

Part of: Differential equations in the complex domain Families, fibrations Special aspects of infinite or finite groups (Co)homology theory

Published online by Cambridge University Press:  18 November 2019

Gaël Cousin Open the ORCID record for Gaël Cousin [Opens in a new window]  and
Viktoria Heu
Gaël Cousin
Affiliation:
GMA-IME, Universidade Federal Fluminense, Campus do Gragoatá, Niterói, RJ, Brazil (gcousin@id.uff.br)
Viktoria Heu
Affiliation:
IRMA, 7 rue René Descartes, 67084Strasbourg, France (heu@math.unistra.fr)
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Abstract

The germ of the universal isomonodromic deformation of a logarithmic connection on a stable $n$-pointed genus $g$ curve always exists in the analytic category. The first part of this article investigates under which conditions it is the analytic germification of an algebraic isomonodromic deformation. Up to some minor technical conditions, this turns out to be the case if and only if the monodromy of the connection has finite orbit under the action of the mapping class group. The second part of this work studies the dynamics of this action in the particular case of reducible rank 2 representations and genus $g>0$, allowing to classify all finite orbits. Both of these results extend recent ones concerning the genus 0 case.

Keywords

isomonodromic deformationsmapping class group

MSC classification

Primary: 20F36: Braid groups; Artin groups 34M56: Isomonodromic deformations
Secondary: 14D05: Structure of families (Picard-Lefschetz, monodromy, etc.) 14F35: Homotopy theory; fundamental groups
Type
Research Article
Information
Journal of the Institute of Mathematics of Jussieu , Volume 20 , Issue 5 , September 2021 , pp. 1497 - 1545
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Copyright
© Cambridge University Press 2019

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Footnotes

The authors would like to warmly thank Gwenaël Massuyeau for discussions around the mapping class group. We are also grateful to the anonymous referee for useful suggestions. This work took place at IRMA and LAREMA. It was supported by ANR-13-BS01-0001-01, ANR-13-JS01-0002-01 and Labex IRMIA.

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