The authors analyze formation and evolution of trapped surfaces during matter collapse in de Sitter spacetime and conclude that black hole and cosmological horizons develop as time evolution of marginally trapped surfaces.
Singularities and time asymmetry,
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Gravitational collapse of matter fields in de Sitter spacetimes
The authors analyze formation and evolution of trapped surfaces during matter collapse in de Sitter spacetime and conclude that black hole and cosmological horizons develop as time evolution of marginally trapped surfaces.