Time Travel and Parallel Universes can’t exist because they are based on the view that a self truly exists in the past, present, and future. There are multiple world systems but that’s different from the idea of parallel universes which says that there are multiple versions of you in parallel universes. It assumes that a self exist here and in other universes. The idea of time travel assumes that a self exists in the past, present and future. If time travel was possible, a person would be able to go to the past with their physical body and talk to their past self, which is based on the view that a self simultaneously exists in the past and also in the present and two versions of yourself could talk to one another. Recollecting past lives is different from time traveling because one is just recollecting the past, not physically traveling and talking to your past self or others and having new conversations with them.
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