In discussions around multiverse hypotheses, what is the extent and current state of conversation around why the multiverse configuration (whether one or many multiverses, etc.) is one which generates/includes universes such as ours?

That is to say, consider that a multiverse could exist in any number of forms. Perhaps that's not the case. Or, perhaps it only contains two lifeless universes, for example. Or it contains an infinite number of universes, all alike. Or it contains a large or infinite number of universes, varying in nature. Or perhaps there are an infinite number of multiverses, making it inevitable for some of the multiverses to contain universes such as ours.

Further, if there's only one multiverse, is there discussion regarding the particular attributes it has, and why it has those? Or contrariwise, if more than one multiverse is needed to give a reason why we exist in one such as ours, what contains them, and what precludes an infinite regression of multi-multi-...multiverses?

  • There are too many possible answers. There are infinitely many approaches but an interesting one might be the one that makes the smallest number of assumptions. Also, you should gives us the distinction between universe and multiverse since both can be numerous according to you. – rus9384 Nov 16 '18 at 16:50
  • @rus9384 I was supposing that there were a couple predominant areas of thought - but perhaps at this stage there are too many schools of thought to summarize trends in thinking. – Don Branson Nov 16 '18 at 18:35
  • And "numerous according to" me? No, that's not a claim I'm making in the least, but ideas of others that I'm seeking to understand. – Don Branson Nov 16 '18 at 18:37
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    This is ironic. Multiverse was introduced partly to explain how our universe is not special but just one among many that happens to be this way. Now we are talking about multiplicity of multiverses with the same question being raised. I suppose one can make the same move, introduce multimultiverse of multiverses, and dismiss such questions. But it is less headache inducing to stick to a single multiverse (or universe). – Conifold Nov 18 '18 at 22:19
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    Thanks, but writing an answer would require me to be more thorough than I have time for right now :) – Conifold Nov 19 '18 at 1:18

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