The convex hypersurface conjecture for infinitesimal strip deformations

For each arc αA\alpha\in\mathscr{A}, let α\underline{\alpha} be a minimally intersecting geodesic representative and let pαp_{\alpha} be a waist; with widths mαm_{\alpha}, define f(X)Hρ1(Γ,g)\boldsymbol f(X)\subset H^1_{\rho}(\Gamma,\mathfrak{g}) as the image of the complex of arc systems under the corresponding infinitesimal strip deformations. Convex hypersurface conjecture. There exists a choice of the representatives α\underline{\alpha} and waists pαp_{\alpha} such that, when mα=1m_{\alpha}=1 for every αA\alpha\in\mathscr{A}, f(X)\boldsymbol f(X) is a convex hypersurface in Hρ1(Γ,g)H^1_{\rho}(\Gamma,\mathfrak{g}). The conjecture would realize the arc-system complex as part of the boundary of the convex hull of a natural discrete subset of the finite-dimensional cohomology space, before projectivization.

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Primary source

Jeffrey Danciger, François Guéritaud and Fanny Kassel, “Margulis spacetimes via the arc complex”, arXiv:1407.5422 (2014).

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