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The classification of ends of properly convex real projective orbifolds II: Properly convex radial ends and totally geodesic ends (1501.00352v4)

Published 2 Jan 2015 in math.GT

Abstract: Real projective structures on $n$-orbifolds are useful in understanding the space of representations of discrete groups into $\mathrm{SL}(n+1, \mathbb{R})$ or $\mathrm{PGL}(n+1, \mathbb{R})$. A recent work shows that many hyperbolic manifolds deform to manifolds with such structures not projectively equivalent to the original ones. The purpose of this paper is to understand the structures of properly convex ends of real projective $n$-dimensional orbifolds. In particular, these have the radial or totally geodesic ends. For this, we will study the natural conditions on eigenvalues of holonomy representations of ends when these ends are manageably understandable. In this paper, we only study the properly convex ends. The main techniques are the Vinberg duality and a generalization of the work of Goldman, Labourie, and Margulis on flat Lorentzian $3$-manifolds. Finally, we show that a noncompact strongly tame properly convex real projective orbifold with generalized lens-type or horospherical ends satisfying some topological conditions always has a strongly irreducible holonomy group.

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