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martinbn
Science Advisor
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He discusses Schwartzschild, where nothing forms. If you have a formation of a black hole, and then reverse "time" you get a white hole, but it will violate some energy conditions.Demystifier said:Wald in the book General Relativity discuses it at page 155. Essentially, take a late state of the black hole and in this state replace all future oriented vectors (velocities etc.) by the opposite past oriented ones. If you take this as initial state, you get a white hole.