Philosophical accounts of non-determinism rooted in quantum indeterminacy or modal realism (Lewis) treat branching as ontologically irreducible, not merely epistemically unexplored.

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Branching(Used to describe how some theories explain chance and possibility in the universe.): The idea that reality splits into multiple possible futures at certain moments, like a tree growing new branches, so that different versions of events actually exist.
Epistemically unexplored(as used in epistemology (the study of knowledge)): Something we simply don't know about or haven't figured out yet, even though it might still be real—it's a gap in our knowledge, not in reality itself.
Lewis(philosopher who created the similarity metric being discussed): David Lewis was a famous American philosopher who developed influential theories about possible worlds—alternative ways reality could have been.
Non-determinism(as used in computer science and philosophy of causation): A system where the same starting conditions can lead to multiple different outcomes, rather than always producing one fixed result.

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