I think you’re using the word “real” in a confusing way. The possibility/likelihood that there are things outside your light cone or possible causal web is completely irrelevant to any experiences you have had or will ever have.
Dreams are “real”, in that the dream is a thing which has an impact on your memories and perceptions. Events and specifics in dreams are “unreal”, in that they have no predictive power nor causal effect on waking experiences.
Likewise your imagining/predicting things in alternate universes (or this universe outside your lightcone) - your beliefs are real, in that they impact your perceptions and actions. The specific instantiations are “unreal” because they have no causal impact on anything in the real world.
I think you’re using the word “real” in a confusing way. The possibility/likelihood that there are things outside your light cone or possible causal web is completely irrelevant to any experiences you have had or will ever have.
Dreams are “real”, in that the dream is a thing which has an impact on your memories and perceptions. Events and specifics in dreams are “unreal”, in that they have no predictive power nor causal effect on waking experiences.
Likewise your imagining/predicting things in alternate universes (or this universe outside your lightcone) - your beliefs are real, in that they impact your perceptions and actions. The specific instantiations are “unreal” because they have no causal impact on anything in the real world.