On 1/13/2020 11:02 AM, Alan Grayson wrote:
On Monday, January 13, 2020 at 11:20:41 AM UTC-7, Brent wrote:
On 1/13/2020 2:21 AM, Alan Grayson wrote:
*Forget about matter. I am discussing spatial extent. If it
starts small, and expands at any rate less than infinite, its
spatial extent cannot be infinite. AG *
But so what? What is "it"? and what are you worried about? If
"it" is some portion of the universe we can see, it's finite. The
inference that the universe is infinite is based on curvature
measure in the part we can see.
*IT, the universe, has (IMO) a very small but positive curvature,
which is what we measure. Since we can't precisely measure zero
curvature, as JC earlier stated, there's no way to distinguish the two
cases -- flat and infinite in spatial extent versus spherical and
finite in spatial extent -- on measurements. But since flat and
infinite at the instant of the BB implies a singularity, I reject that
model. AG
*
Fine. Nobody thinks there was a singularity.
Brent
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