this post was submitted on 14 Jul 2026
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There's only one solution to time travel paradoxes that resolves all of them, makes some kind of sense, and doesn't require generating an infinite number of additional versions of the universe - single coherent timeline. The universe as it is now is the sum total result of all time travel that will ever have happened to a point in time before the present. You can't go back in time and kill Hitler because you didn't, which means any attempt you might have made to do so clearly failed. Likewise for the grandfather paradox, if you go back in time to kill your grandfather, you already failed in your mission.
Awful views aside, one of the things I gave JKR credit for was doing a decent job of adopting this model of time travel in Prisoner of Azkaban. Then she threw that out the window for Cursed Child because she's terrible at any kind of world building consistency.