Mathematics – Classical Analysis and ODEs
Scientific paper
2011-05-11
Mathematics
Classical Analysis and ODEs
57 pages, 25 figures, to be published in Moscow Mathematical Journal
Scientific paper
In this, paper, we give a complete system of analytic invariants for the unfoldings of nonresonant linear differential systems with an irregular singularity of Poincar\'e rank 1 at the origin over a fixed neighborhood $D_r$. The unfolding parameter $\epsilon $ is taken in a sector S pointed at the origin of opening larger than $2 \pi$ in the complex plane, thus covering a whole neighborhood of the origin. For each parameter value in S, we cover $D_r$ with two sectors and, over each sector, we construct a well chosen basis of solutions of the unfolded linear differential systems. This basis is used to find the analytic invariants linked to the monodromy of the chosen basis around the singular points. The analytic invariants give a complete geometric interpretation to the well-known Stokes matrices at $\epsilon =0$: this includes the link (existing at least for the generic cases) between the divergence of the solutions at $\epsilon =0$ and the presence of logarithmic terms in the solutions for resonance values of the unfolding parameter. Finally, we give a realization theorem for a given complete system of analytic invariants satisfying a necessary and sufficient condition, thus identifying the set of modules.
Lambert Caroline
Rousseau Christiane
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