English

Necessary and sufficient conditions for meromorphic integrability near a curve

Dynamical Systems 2017-04-28 v1

Abstract

Let us consider a vector field XX meromorphic on a neighbourhood of an algebraic curve ΓˉPn\bar{\Gamma}\subset \mathbb{P}^n such that Γ\Gamma is a particular solution of XX. The vector field XX is (l,nl)(l,n-l) integrable if it there exists Y1,,Yl1,XY_1,\dots,Y_{l-1},X vector fields commuting pairwise, and F1,,FnlF_1,\dots,F_{n-l} common first integrals. The Ayoul-Zung Theorem gives necessary conditions in terms of Galois groups for meromorphic integrability of XX in a neighbourhood of Γ\Gamma. Conversely, if these conditions are satisfied, we prove that if the first normal variational equation NVE1NVE_1 has a virtually diagonal monodromy group Mon(NVE1)Mon(NVE_1) with non resonance and Diophantine properties, XX is meromorphically integrable on a finite covering of a neighbourhood of Γ\Gamma. We then prove the same relaxing the non resonance condition but adding an additional Galoisian condition, which in fine is implied by the previous non resonance hypothesis. Using the same strategy, we then prove a linearisability result near 00 for a time dependant vector field XX with X(0)=0  tX(0)=0\;\forall t.

Keywords

Cite

@article{arxiv.1704.08279,
  title  = {Necessary and sufficient conditions for meromorphic integrability near a curve},
  author = {Thierry Combot},
  journal= {arXiv preprint arXiv:1704.08279},
  year   = {2017}
}

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33 pages