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Author Topic:   Cosmological Constant and Dark Energy has been in the news for months.
Taq
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Posts: 10158
Joined: 03-06-2009
Member Rating: 3.5


Message 5 of 53 (917486)
04-09-2024 1:03 PM
Reply to: Message 1 by LamarkNewAge
04-09-2024 12:52 AM


LamarkNewAge writes:
But, the (um)clue is a fortunate one, if one values science. It is actually scary to think that a pure coincidence could have caused us to assume all of the expansion of space was due to a "cosmological constant" when our perfect number inflation observation was more of an artifact fluke.
The cosmological constant was thrown out a long time ago once we observed that the universe was expanding. The CC was something Einstein threw in because he thought the universe was eternal and static, so there had to be something that perfectly balanced the universe between expanding and contracting. Once we understood that the universe wasn't static then there was no need for the CC.
Could the CC make a comeback? Maybe. That's what the article you quoted was suggesting. However, the CC isn't a part of modern Big Bang models, so it isn't a problem if the CC is not brought back.
But I doubted the Dark Energy was very good proof of the perfect "cosmological constant".
Who is saying that Dark Energy is good proof of the CC? Einstein called the CC his biggest mistake, and that was before the discovery of dark energy.

This message is a reply to:
 Message 1 by LamarkNewAge, posted 04-09-2024 12:52 AM LamarkNewAge has replied

Replies to this message:
 Message 8 by LamarkNewAge, posted 04-09-2024 3:02 PM Taq has replied

  
Taq
Member
Posts: 10158
Joined: 03-06-2009
Member Rating: 3.5


(1)
Message 10 of 53 (917498)
04-09-2024 3:12 PM
Reply to: Message 8 by LamarkNewAge
04-09-2024 3:02 PM


LamarkNewAge writes:
A Cosmological Constant DID make a comeback - in 1998, and it is not a stretch to say that most cosmologists felt that Dark Energy was proof of the Cosmological Constant
From my limited understanding as a physics layperson . . .
The accelerating expansion of the universe is the evidence for dark energy. It is no different than watching two masses being attracted to one another and calling it gravity. I don't understand why CC even has to be brought into the conversation because dark energy already encompasses what is being observed.

This message is a reply to:
 Message 8 by LamarkNewAge, posted 04-09-2024 3:02 PM LamarkNewAge has replied

Replies to this message:
 Message 12 by LamarkNewAge, posted 04-09-2024 3:38 PM Taq has replied

  
Taq
Member
Posts: 10158
Joined: 03-06-2009
Member Rating: 3.5


(1)
Message 13 of 53 (917508)
04-09-2024 3:56 PM
Reply to: Message 12 by LamarkNewAge
04-09-2024 3:38 PM


LamarkNewAge writes:
You seem to be saying there is no practical value to knowing what Dark Energy comes from.
No. I am saying that the CC doesn't seem to have any practical value, at least in the eyes of this poorly informed physics layman.

This message is a reply to:
 Message 12 by LamarkNewAge, posted 04-09-2024 3:38 PM LamarkNewAge has replied

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 Message 14 by LamarkNewAge, posted 04-09-2024 4:17 PM Taq has replied

  
Taq
Member
Posts: 10158
Joined: 03-06-2009
Member Rating: 3.5


Message 15 of 53 (917516)
04-09-2024 4:35 PM
Reply to: Message 14 by LamarkNewAge
04-09-2024 4:17 PM


Re: Dark Energy has a measurable value.
LamarkNewAge writes:
What is your opinion on the average number value of Dark Energy?
I don't have an opinion on it. It is my understanding that the value ascribed to dark energy is just a product of how much acceleration is measured in the expansion of space. It's like asking my opinion on the speed of light.

This message is a reply to:
 Message 14 by LamarkNewAge, posted 04-09-2024 4:17 PM LamarkNewAge has replied

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 Message 16 by LamarkNewAge, posted 04-09-2024 4:40 PM Taq has replied

  
Taq
Member
Posts: 10158
Joined: 03-06-2009
Member Rating: 3.5


Message 17 of 53 (917519)
04-09-2024 4:55 PM
Reply to: Message 16 by LamarkNewAge
04-09-2024 4:40 PM


Re: Dark Energy has a measurable value.
LamarkNewAge writes:
I dont think there is a controversy when one measures the speed of light.
From my understanding, dark energy is just the placeholder name for what is causing the expansion of space to accelerate, so the value is a direct result of the measurement just like the speed of light.

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 Message 16 by LamarkNewAge, posted 04-09-2024 4:40 PM LamarkNewAge has replied

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 Message 18 by LamarkNewAge, posted 04-09-2024 5:13 PM Taq has replied

  
Taq
Member
Posts: 10158
Joined: 03-06-2009
Member Rating: 3.5


Message 19 of 53 (917526)
04-09-2024 5:21 PM
Reply to: Message 18 by LamarkNewAge
04-09-2024 5:13 PM


Re: Dark Energy has a measurable value.
LamarkNewAge writes:
The age of the universe is affected by this probable change in the (now very disputed) number value of Dark Energy, for one thing.

You seem to feel that the number value of Dark Energy is unimportant.
What I am saying is that this number is simply a measurement. I agree that the age of the universe could change as we make better and better measurements, and possibly find systematic errors in how those measurements are interpreted. This is true for pretty much all of physics.
One thing that should possibly scare you is there is now the possibility that the value could change suddenly, and the difference between a positive and negative number value could - if extreme enough possibilities are considered - in theory, possibly cause the whole universe to collapse in our lifetimes.
It scares me as much as the speed of light suddenly changing and causing the Sun to decimate the Earth.

This message is a reply to:
 Message 18 by LamarkNewAge, posted 04-09-2024 5:13 PM LamarkNewAge has replied

Replies to this message:
 Message 20 by LamarkNewAge, posted 04-09-2024 5:36 PM Taq has replied

  
Taq
Member
Posts: 10158
Joined: 03-06-2009
Member Rating: 3.5


Message 22 of 53 (917536)
04-09-2024 6:24 PM
Reply to: Message 20 by LamarkNewAge
04-09-2024 5:36 PM


Re: Dark Energy has a measurable value.
LamarkNewAge writes:
But has the speed of light ever changed?
If it does it could destroy the Earth, so you better be worried.
Also, gravity could suddenly become a repulsive force and blow the planet apart. Yet another reason to be worried.

This message is a reply to:
 Message 20 by LamarkNewAge, posted 04-09-2024 5:36 PM LamarkNewAge has not replied

  
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