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The theoretical symmetry of physical laws under the transformation of time reversal, that is t -> -t.

36 votes
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Do colliding black holes violate time reversal symmetry?

You missed something: the gravitational waves. A black hole merger spacetime contains gravitational waves leaving the merger at the speed of light. Time reversal reverses time across the entire space …
The_Sympathizer's user avatar
2 votes

Is it possible to fall into a black hole, then come back out?

The problem here is that one is not being complete enough in taking the time reversal, that is, not accounting for that in a time-reversed picture everything in the universe is reversed and so inadver …
The_Sympathizer's user avatar