Global properties of vector fields on compact Lie groups in Komatsu classes. II. Normal forms

Abstract

Let $G_1$ and $G_2$ be compact Lie groups, $X_1\in {\mathfrak{g}}_1$, $X_2\in {\mathfrak{g}}_2$ and consider the operator \begin{equation*} L_{aq} = X_1 + a(x_1)X_2 + q(x_1,x_2), \end{equation*} where $a$ and $q$ are ultradifferentiable functions in the sense of Komatsu, and $a$ is real-valued. We characterize completely the global hypoellipticity and the global solvability of $L_{aq}$ in the sense of Komatsu. For this, we present a conjugation between $L_{aq}$ and a constant-coefficient operator that preserves these global properties in Komatsu classes. We also present examples of globally hypoelliptic and globally solvable operators on ${\mathbb{T}}^1\times {\mathbb{S}}^3$ and ${\mathbb{S}}^3\times {\mathbb{S}}^3$ in the sense of Komatsu. In particular, we give examples of differential operators which are not globally $C^{\infty }$-solvable, but are globally solvable in Gevrey spaces.

arXiv comment23 pages. arXiv admin note: text overlap with arXiv:1910.01922, arXiv:1910.00059

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Cited by in corpus (1)

• Global analytic hypoellipticity for a class of evolution operators on ${\mathbb{T}}^1\times {\mathbb{S}}^3$