Hi,

> Naive question: do physicists reconcile a "really flat" universe and 
> the big bang theory? I don't see how.

you mean this problem?

http://en.wikipedia.org/wiki/Big_bang#Flatness.2Foldness_problem

Inflationary theories give a solution, but it is a bit ad hoc.
I am not a big fan of Big Bang - I like Paul Steinhardt's (not Eric 
Steinhart) cyclic universe, but I have not read enough about that model 
to know if it fares better explaining cosmological observations (but it 
is _compatible_ with current observations).

But those reflections are from before my MWI times ;-)
MWI explains fine-tuning (but not flatness) due to the anthropic principle.

Cheers,
Günther

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