|Location:||MSRI: Baker Board Room|
We will describe a properness criterion for free groups acting by isometries of Minkowski 3-space in terms of the deformation theory of hyperbolic surfaces. A corollary of the criterion is that every Margulis spacetime fibers in lines over a hyperbolic surface.
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We will discuss some details of the proof, including the case in which the linear part has parabolics. This talk is based on joint work with François Guéritaud and Fanny Kassel.