Nihilism is the most boring of cultshttps://twitter.com/vakibs/status/940233592369811456 …
The universe with respect to an observer is only the causal network that feeds back to him. All causal branches that cannot lead back are part of a different universe. Thus, we can be in a setup like the one you have in mind but it makes no difference.
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I think there is only one universe. But the link of causality is constrained for certain observers who cannot see the othe paths in which the universe is unfolding. But it is not true always. For example, the double slit experiment in quantum interference.
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If we cannot have any evidence for the number of universes in existence, it is logically wrong to have a nonzero confidence in the belief that there is only one. What would such evidence look like? Likewise, speculation about observers in other universes is pointless.
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