I ask this question from a position of profound ignorance of physics.
I would have answered the question in the title with a reflexive "of course not" until just a few minutes ago when something occured to me.
As far as I know, it's entirely possible that it was [i]physically possible[/i] for all the constants of nature could have turned out to be different. This, in turn, would have made for worlds in which the laws of physics would have appeared quite different to creatures inhabiting those worlds than ours appear to us, up until those creatures had succeeded in completing a full and correct theory of everything.
So what constraints are there on these basic constants? Are there any but mathematical constraints? If not, isn't this tantamount to saying there are none but logical constraints? If that's so, then, doesn't this imply that the physical possibilities are exactly the same as the logical possibilities?
Another way to put it: If a multiverse theory turns out to be correct in physic ... (read more