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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Replying to @Plinz @TheodoreBolha and
We disagree merely about how we define the word "universe". I am sticking to the etymology of the word: uni+verse.
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Replying to @vakibs @TheodoreBolha and
Isn't it confusing to pick meaning for words that cannot have a referent with assignable truth values?
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Replying to @Plinz @TheodoreBolha and
Life is confusing :) There are many concepts for which truth values cannot be assigned. We try to do the best with what we have (language). Sometimes we convey meaning. It is easier to convey meaning when there is a human on the other side, and not a computer.
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Replying to @vakibs @TheodoreBolha and
By the way, thank you for your pointer wrt. diverging but partially interactive multiverses (I was stuck there for a while too). This made me discover an important argument against the monadic perspective and may lead to deeper insights!
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Basically, try to construct a highly connected substrate graph with information flowing along its links, and for each node try find subset of nodes/links that forms a deterministic causal network. Anthropic principle, and we are in one of the solutions? How to derive uniformity?
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The *best* pointer to deeper insights via the multiverse is David Deutsch. Have you read any of his stuff? Fabric of Reality, Beginning of Infinity or Constructor Theory? http://constructortheory.org Would love to hear your take on any of these.
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Btw., I think that the multiverse interpretation ultimately results from a difficulty to reconcile reversibility and indeterminism. There is a better way.
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Interesting, thanks for your thoughts on it.
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I suspect that there is good reason to believe that the universe is computable, and not hypercomputational. Continuous time means that your universe computer is literally infinitely more expensive. The multiverse is a memory leak...
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The total memory demands of a multiverse can be bounded by the number of possible permutations of all bits in the universe, but when you think it through, it becomes unnecessary.
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OTOH, I like the mad dog interpretation of the multiverse, i.e. it is not the universe that goes into superposition and collapses into a state, but the observer.
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