Alternate normal form conjecture for generic unfoldings of saddle-nodes

Let kNk\in\mathbb{N}, let μ\germε\mu\in\germ{\varepsilon} be a germ of holomorphic function, and let τ^Z0\widehat{\tau}\in\mathbb{Z}_{\geq0} satisfy μ0+τ^R0\mu_{0}+\widehat{\tau}\notin\mathbb{R}_{\leq0}. Consider a generic convergent unfolding of a germ of saddle-node holomorphic vector field with formal invariant μ\mu.

Alternate normal form conjecture. Any such unfolding is orbitally conjugate to an unfolding of the form

\fonf+y\widehat{R}\pp y, \qquad \widehat{R}\in x\pol x_{<k}\left\\{x^{\widehat{\tau}}y\right\\}.

Moreover, this form is unique up to conjugacy by linear maps

(ε,x,y)(ε,x,cεy),(\varepsilon,x,y)\mapsto(\varepsilon,x,c_{\varepsilon}y),

where c\germε×c\in\germ{\varepsilon}^{\times}. This proposed form is intended as a generalization of earlier normal forms, while the existence and uniqueness assertion is presented in the source as a conjectural extension.

Sources & referencesView supporting material

Primary source

C. Rousseau and Loïc Jean Dit Teyssier, “Analytic normal forms and inverse problems for unfoldings of 2-dimensional saddle-nodes with analytic center manifold”, arXiv:1810.04890 (2018).

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