event horizon

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Formal definition

The boundary of the causal past of future null infinity, i.e., \partial J^-(\mathscr{I}^+)\,. It is the boundary of points in spacetime that can send light signals to \mathscr{I}^+\, ("infinity").

Retrieved from "http://www.physics.thetangentbundle.net/wiki/General_relativity/event_horizon"
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