Emh, no.
The set of possible universes that can possibly exist is a superset, not necessary equivalent, to the set of universes that can nomologically exist. It is probably much vaster. If you can nomologically exist, then you necessarily can logically exist. The contrary is not true.
I do not think the distinction necessary here. We are talking about things we have no evidence of and I really cannot see how anyone can say what physical or mathematic systems limit or apply to other universes. In fact the only limiting factor I can think of for multiverses would be a infinite set. According to my Hero of philosophy Ravi Zacharias, Malcolm Muggeridge and your friend and mine were the two greatest wordsmiths that ever lived. I would throw in Lincoln as well. Regardless Muggeridge once said:
“So the final conclusion would surely be that whereas other civilizations have been brought down by attacks of barbarians from without, ours had the unique distinction of training its own destroyers at its own educational institutions, and then providing them with facilities for propagating their destructive ideology far and wide, all at the public expense. Thus did Western Man decide to abolish himself, creating his own boredom out of his own affluence, his own vulnerability out of his own strength, his own impotence out of his own erotomania, himself blowing the trumpet that brought the walls of his own city tumbling down, and having convinced himself that he was too numerous, labored with pill and scalpel and syringe to make himself fewer. Until at last,
having educated himself into imbecility, and polluted and drugged himself into stupefaction, he keeled over--a weary, battered old brontosaurus--and became extinct.”
―
Malcolm Muggeridge,
Vintage Muggeridge: Religion and Society
You must admit agree or not that guy could put sentences together.
If we find out that, nomologically, only one Universe can exist, that does not reduce the size of logically possible Universes and the coherence of any discussion about them.
I am not discussing the probability of more than one universe. I am talking about only having evidence of one universe. But only the discussion of possible universes if possible is relevant. To discuss square circles may be possible but it is meaningless.
I make the assumption here that you understand the difference between logical and nomological propositions.
I would say the difference is between acknowledging a brute fact that is not understandable but still true, and a truth that follows along with our rational intuitions gained by investigation.
By the way. Your friend Vilenkin expects, and he wrote a book about it, an enormous multitude of, nomologicallly coherent, Universes.
That would I think both be a case of what Malcolm was speaking of and even if not something I would not be capable of understanding enough of to be a meaningful use of my time.
Do you think his physics is wrong?
I have never seen his physics for these other universes by I do not believe he has the capability to develop any physics what so ever about any other universe. I am not a Velinkinite. I use him for what he is immensely qualified to speak upon. Other universes would not be among them IMO. I told you about the final faculty lecture I went to where the same scientists in some cases (and these are heavyweights, this was where Von Braun worked) explained that our own universe contradicted it's self. That was the end of a long trip that led from being mesmerized by these theoretical guys to being felt cheated and left without any credibility for what they do. I think I probably overly disregard them because of the momentum gained by the how high the fall started from but I don't think I think too low of them by a wide margin. They actually left me so disaffected I lost any interest in even abstract science with the except of what is intuitive. You still seem to be on the peek I fell from, and what you say sounds impressive even if at it's core it is of little practical value.
You would make one formable Apologist if you would just come over to the light side of the force.
You ever seen that family guy episode about star wars where Darth Vader (Stewie) told Luke (Chris) "he should come over to the back side of the force, then said he meant dark side, it had been a long day".
I am sure I have asked before but if you don't mind what did you say you do for a living?