I think all cosmologist, like Hartle, recognize that /the *observable*
universe/ was much smaller in the past. Which is perfectly compatible
with /the universe/ be spacially flat and infinite.
Brent
On 2/25/2025 2:40 AM, Alan Grayson wrote:
On page 21 Hartle asserts that at the BB, "the whole of the observable
universe today was compressed to the smallest possible volume." He's
considered authoritative on General Relativity. I wonder; why do some
experts think the universe decreases in volume as we go back in time,
but others, such as Penrose (according to Quentin), believe in an
always infinite universe where the average distance between galaxies
decreases as we back in time? AG
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