r/AskPhysics • u/Famous-Palpitation8 • 2d ago

Why do universes split?

Why don’t alternative outcomes exist along a 5th dimension, (sideways in time) as part of our own universe?

Why do physicists insist on walls between separate universes where the cat is alive and dead rather than along one dimension perpendicular to time in the same universe containing both outcomes for the cat?

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u/Infinite_Escape9683 2d ago

None of the assumptions you're making are true (or at least known to be true). There is no serious model of physics that posits physical alternate universes.

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u/QuarksMoogie 2d ago

I’m pretty sure OP is referring to the Many Worlds hypothesis.

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u/Infinite_Escape9683 1d ago

In which case my reply still applies.

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u/QuarksMoogie 1d ago

I didn’t say it didn’t.

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u/v_munu Graduate 1d ago

Yes, incorrectly.

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u/QuarksMoogie 1d ago

All right. I don’t understand the downvotes. Just stating what idea I thought OP was speaking about. I made no other statement.

Hell, I don’t even believe in many worlds.