Cosmologist think the universe is spatially flat. That just means
triangles have interior angles summing to 180deg. It doesn't have
anything to do with extent. But the universe is not flat in spacetime;
it's expanding and at an increasing rate.
Brent
On 11/9/2017 3:10 PM, [email protected] wrote:
IIUC, the difference is huge. In the former case, the universe is
open, spatially infinite with infinite mass (assuming a nonzero mass
distribution on large scale everywhere), whereas the latter is closed,
finite in spatial extent and mass. But I notice that most cosmologists
claim the universe is *flat*, as in mathematically flat. Are they just
speaking loosely and really mean the universe is ASYMPTOTICALLY flat?
I find it contradictory for a universe which is finite in age, to be
truly mathematically FLAT. TIA.
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