>>11401395>Since time is a dimension, a particle going back in time would just be movement.Movement is spatial displacement over time. A particle going back in time is just moving in some other direction in spacetime. Imagine that each planck second you consider to be the present is just a 3D slice of a 4D spacetime. The arrangements of matter are already there, like still frames in a film, and you perceive motion as you scan the frames in a direction (in this case, the direction of increasing entropy) and particles seamlessly appear to move at macroscopic scales. Motion is an illusion of beings that do not travel at c.
>Movement doesn't drag the whole cosmos around, so the particle would meet total emptiness, since all the other particles would be in the future. It would meet the past state of all other particles, since they must be there.
>There's no archiveIt isn't necessary. All physically real phenomena exist somewhere at some time, so they have locations in spacetime.
>and particles don't remember where they have been to.They sort of do, there is a finite number of combinations of physical interactions and arrangements of matter that are responsible for any given particles present state. Every such valid combination is equally real and exists somewhere in spacetime.
>The past is gone.This is false, the past is just a direction and everything in it is still there, you're simply not experiencing it right now. The same is true for all physically possible futures.
