Hi Sam,
> A query from a lurker: why is the universe as a whole considered a closed
> system? How do we know whether it is or isn't, or does it follow
> automatically from some other (perfectly sensible) prior assumption?
>
> Just curious.
>
Good question!!! The classical view is that there is one and only one
Universe. If that's all there is, then you can't have anything outside it - so
it is closed (complete).
I know that some cosmologists now talk about multiple universes, but I don't
understand all the theory behind it. I assume that when they talk about 2 or
more universes, those universes can't overlap in any of the 4 dimensions -
otherwise they wouldn't be separate universes . . . . And if they can't
overlap, they can't interact energetically, so then each would be
thermodynamically a closed system unto itself.
Is there anyone out there who can explain the "many universes" idea?
Jonathan
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