2020
DOI: 10.3934/dcds.2020164
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On globally hypoelliptic abelian actions and their existence on homogeneous spaces

Abstract: We define globally hypoelliptic smooth R k actions as actions whose leafwise Laplacian along the orbit foliation is a globally hypoelliptic differential operator. When k = 1, strong global rigidity is conjectured by Greenfield-Wallach and Katok: every globally hypoelliptic flow is smoothly conjugate to a Diophantine flow on the torus. The conjecture has been confirmed for all homogeneous flows on homogeneous spaces [9]. In this paper we conjecture that among homogeneous R k actions (k ≥ 2) on homogeneous space… Show more

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