Here, I’m going to test out a thought experiment that I’ve been working out very recently. This topic has specifically to do with the multiverse itself and how it relates to fine-tuning. We all know the fine-tuning arguments, it’s been outlined pretty widely at this point and anyone in this discussion long enough has definitely discussed it or read about it at some point or another. I found earlier today that the Stanford Encyclopedia of Philosophy had published an excellent article outlining fine-tuning and the finely tuned constants, responses to fine-tuning and responses to the responses. It’s really a fantastic article and a great go-to resource on this topic that had been missing.
Anyways, one of the frequent responses to fine-tuning is the possibility of a multiverse. If a multiverse exists, then that explains fine-tuning. I don’t think so. As I’ve been considering this question, I’ve actually come to the conclusion that even if the multiverse does exist, it doesn’t even get us a teensy bit closer to explaining fine-tuning. I’ll hope to test that out here.
First of all, we’re all also familiar with the astronomical probabilities of some of the constants, ranging from things like 1 in 10^30, 1 in 10^50, and even 1 in 10^120. All the ‘multiverse’ means is that there is more than one universe. So if the multiverse exists, why can’t the multiverse only be two universes? If there are only two universes, then these astronomical probabilities remain hopelessly astronomical. Why can’t there be 10 universes instead of any more? Or even 100? Or even 10 billion? Or 10^24 universes? There’s no reason to think that if a multiverse exists, it would be something like the near infinite number of universes required to counter the constants improbability, let alone an infinite number. But let’s grant that there is an infinite number of universe. Explained now? Well … no.
This is because even if an infinite amount of universes existed, whose to say that they aren’t absolutely identical to each other? Or at least, identical in their constants and structure. In this case, even though there is an infinite number of universes, the probability that this multiverse network will have life is still exactly the same as if there was one universe. And so nothing is explained. In fact, if there were some sort of mechanism that just produced an infinite number of universes endlessly, I couldn’t imagine at all that this mechanism would magically shift itself so as to produce different constants each time it made a universe – it’s seems to me that this mechanism would just produce multiverses on mass in the same ‘method’ like a factory produces countless replicas of the exact same item. In other words, even if a multiverse existed, this doesn’t get us a teensy bit closer to explaining the existence of life in spite of the odds.
What do you guys think about this?