On 4/10/2025 9:42 PM, Alan Grayson wrote:
On Thursday, April 10, 2025 at 9:43:20 PM UTC-6 Brent Meeker wrote:
On 4/10/2025 8:34 PM, Alan Grayson wrote:
*The boundary condition for the universe is its present
state and it's not finite.
*
Brent
How do you*know *that? ISTM, you're speculating and
misrepresenting your speculation for knowledge. Data from
the Planck spacecraft isn't conclusive. AG
Read any text, or Vic's "Comprehensible Universe". It you're
going to choose a boundary condition for the universe what
would you pick besides the one state you know?
Brent
We don't KNOW that the universe is infinite in spatial extent!
This is true regardless of what one chooses as its boundary
condition. AG
Did you miss the word "choose"? Do you have an alternative in
mind? Do you know what the equation is?
Brent
What's an equation? I have no idea what it means or is.
Look up FLRW cosmology or read Vic's Comprehensible Cosmos chapter on
cosmology.
Please stop you're BS. You claimed the universe is infinite in spatial
extent. *YOUR WORDS! *You don't know what the fuck you are claiming. AG
And you don't know what the fuck you're talking about. I notice you
write "YOUR WORDS!" but you didn't actually quote me.
The FLRW equation for the universe only has a scale factor which is set
to 1 at the present so depending on the other parameters it describes a
universe that expands indefinitely or that collapses in the future. The
scale factor going to zero in the past (or future) means that the part
of the universe we know was then infinitely dense. All the stuff we can
see was packed into a zero size.
Whether the universe is spatially infinite is a slightly different
question. It's an extrapolation from the part we can see to assume it's
homogeneous and isotropic on a large scale. The CMB is at 2.73degK and
varies by only 0.0001degK across the sky. If we make that
extrapolation, as is commonly done, the universe is infinite. Without
some such extrapolation beyond what we can see we can't write down any
solution of Einstein's equations and we can't do cosmology.
Brent
*The boundary condition for the universe is its present
state and it's not finite.
*
*Brent*
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