This paper is a survey of affine Anosov representations, a framework in which proper affine actions of hyperbolic groups are characterized by Margulis invariant spectra, mostly quoting the author's own results.
Proper affine deformations of positive representations
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abstract
We define for every positive Anosov representation of a nonabelian free group into $\mathrm{SO}(2n,2n-1)$ a family of $\mathbb{R}^{4n-1}$-valued cocycles which induce proper affine actions on $\mathbb{R}^{4n-1}$. We construct fundamental domains in $\mathbb{R}^{4n-1}$ bounded by generalized crooked planes for these affine actions, and deduce that the quotient manifolds are homeomorphic to handlebodies.
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Affine Anosov representations
This paper is a survey of affine Anosov representations, a framework in which proper affine actions of hyperbolic groups are characterized by Margulis invariant spectra, mostly quoting the author's own results.