  We propose a CFT unitary description of the gravitational collapse. The
starting point is the model of a black hole in AdS proposed by Maldacena in
arXiv: 0106112 [hep-th]. We show that by proposing a two-copies version of the
AdS/CFT conjecture, the process of formation of black holes so as other
spacetimes with horizons may be described as an unitary process in the dual
field theory. In doing this, we construct a well defined framework to describe
general spacetimes as entangled states, in terms of the spectrum of states on
the exact Anti-de-Sitter background. As application, we show how the
description of the Hawking-Page transition results simplified in this formalism
and some novel aspects may be observed. Finally, a simplified analysis based on
weakly coupled bulk fields is discussed.
