Strongly essential flows on irreducible parabolic geometries

Melnick, Karin; Neusser, Katharina

doi:10.1090/tran/6814

Strongly essential flows on irreducible parabolic geometries
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by Karin Melnick and Katharina Neusser PDF

Trans. Amer. Math. Soc. 368 (2016), 8079-8110 Request permission

Abstract:

We study the local geometry of irreducible parabolic geometries admitting strongly essential flows; these are flows by local automorphisms with higher-order fixed points. We prove several new rigidity results and recover some old ones for projective and conformal structures, which show that in many cases the existence of a strongly essential flow implies local flatness of the geometry on an open set having the fixed point in its closure. For almost c-projective and almost quaternionic structures we can moreover show flatness of the geometry on a neighborhood of the fixed point.

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