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Based on scale critical initial data, we construct smooth asymptotically flatCauchy initial data for the Einstein vacuum system that does not containMarginally Outer Trapped Surfaces (MOTS) but whose future evolution contains atrapped region, which itself is bounded by an apparent horizon (a smoothhypersurface foliated by MOTS).  Although the long time behaviour of these solutions is unknown, a statementof Kerr Stability would yield a dynamical, scale critical, non-sphericallysymmetric class of vacuum examples for the conjectures of Weak CosmicCensorship and Final State.  Owing to estimates obtained for the ADM mass of the data and the area of theMOTS foliating the apparent horizon, this construction yields a dynamicalsetting in which to test the conjectured spacetime Penrose Inequality. We showthat the inequality holds in an open region in the future of the initial data,which itself can be controlled by the parameters of the initial data.

Construction of Cauchy data for the dynamical formation of apparent horizons and the Penrose Inequality