I feel almost certain that Harry is living in a computer simulation. I know he ruled it out because he decided the existence of the Time Turner renders the universe non-computable, but how can he be sure that he’s actually going backwards in time instead of the universe “simulating going back to the past and computing a different future?”
Time-travel doesn’t make the universe uncomputable, is the thing.
Time-travel makes certain laws of physics uncomputable, but there are any number of equivalent, far more complex sets of laws that would look the same to humans but remain computable—Eliezer’s mind is running one, for starters. When writing a simulation, you would use one of those.
I feel almost certain that Harry is living in a computer simulation. I know he ruled it out because he decided the existence of the Time Turner renders the universe non-computable, but how can he be sure that he’s actually going backwards in time instead of the universe “simulating going back to the past and computing a different future?”
Time-travel doesn’t make the universe uncomputable, is the thing.
Time-travel makes certain laws of physics uncomputable, but there are any number of equivalent, far more complex sets of laws that would look the same to humans but remain computable—Eliezer’s mind is running one, for starters. When writing a simulation, you would use one of those.