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From: Kestrel Clayton <richZIG.e.clayZIGton@gmail.com>
Newsgroups: talk.origins
Subject: Re: The Big Crunch may be a possibility
Date: Thu, 27 Mar 2025 10:19:43 -0400
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On 27-Mar-25 01:53, jillery wrote:
> On Wed, 26 Mar 2025 09:31:10 -0400, Kestrel Clayton
> <richZIG.e.clayZIGton@gmail.com> wrote:
> 
>> Here's a source I found useful, as a first-pass primer:
>>
>> https://newscenter.lbl.gov/2025/03/19/new-desi-results-strengthen-hints-that-dark-energy-may-evolve/
>>
>> It's still pop science, but at least it's pop science written by actual
>> scientists. The page is careful to state "the preference for an evolving
>> dark energy has not risen to '5 sigma,' the gold standard in physics
>> that represents the threshold for a discovery." Also it does not claim
>> that cosmic expansion is slowing; only that the *rate of increase* in
>> expansion due to dark energy may have slowed in the past (and is
>> presumably still slowing). In other words, the car isn't slowing down,
>> but dark energy is very slowly easing up on the throttle.
> 
> 
> IIUC you distinguish between "rate of increase" aka acceleration and
> plain vanilla increase.  If dark energy is constant, then rate of
> increase would be proportional to the distance between objects aka
> Hubble's Law.  If distant objects accelerate more slowly than
> expected, then some other factor besides dark energy or gravity is
> involved (gravity weakens over distance).
> 
> I have speculated in the past that dark energy might weaken over time
> due to some quantum effect, which suggests that spacetime isn't doomed
> to expand forever, and instead, some googolplexian years from now,
> collapse cyclically back onto itself.

Could well be. We're far off the map from what I know — when I was a 
physics student, the phrase "dark energy" hadn't even been coined yet.

-- 
[The address listed is a spam trap. To reply, take off every zig.]
Kestrel Clayton
"Every normal woman must be tempted, at times, to stoke the fire,
host the black mass, and begin eating hearts." — Rose Bailey