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Figure 1: The phase space picture for the black hole threshold in the presence of a critical point.
Every point correspond to an initial data set, that is, a 3-metric, extrinsic curvature, and matter
fields. (In type II critical collapse these are only up to scale). The arrow lines are solution curves,
corresponding to spacetimes, but the critical solution, which is stationary (type I) or self-similar
(type II) is represented by a point. The line without an arrow is not a time evolution, but a
1-parameter family of initial data that crosses the black hole threshold at p = p*. The 2-dimensional
plane represents an ( |