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Originally posted by GradyPhilpott
"The significance is huge," said Professor Ray Carlberg
Originally posted by sardion2000
(RE) Einsteins Cosmological Constant. Sounds sort of like the Ether that had Physists convinced that it exists, is this sort of the same thing dressed in physics jargon?
Originally posted by mrjones
So if this is correct then we actually knew more about the universe than we thought and have known it for around 75 years!
Originally posted by GradyPhilpott
I think that the fact that looking out into space gives a view of the past is a good thing. It is the only way we would have any possibilty of finding out just how it all began and that, of course, is the question that has troubled man since we first developed the capacity for abstract thought. It's kind of neat the way that works, huh. Kinda like someone planned it that way. But, of course, we know that's nonsense.
Originally posted by GradyPhilpott
.............................
It's kind of neat the way that works, huh. Kinda like someone planned it that way. But, of course, we know that's nonsense.
Originally posted by Valhall
Actually, NO. In my opinion that would be an erroneous interpretation. What this means is that 75 years ago Einstein was more honest than the scientists of the past decade have been.
Research News: Finding a Way to Test for Dark Energy
For Einstein's cosmological constant to result in the universe we see today, the energy scale would have to be many orders of magnitude smaller than anything else in the universe. While this may be possible, Linder says, it does not seem likely. Enter the concept of "quintessence," named after the fifth element of the ancient Greeks, in addition to air, earth, fire, and water; they believed it to be the force that held the moon and stars in place.
Vacuum Energy Density, or How Can Nothing Weigh Something?
However, there is a basic flaw in this Einstein static model: it is unstable - like a pencil balanced on its point. For imagine that the Universe grew slightly: say by 1 part per million in size. Then the vacuum energy density stays the same, but the matter energy density goes down by 3 parts per million. This gives a net negative gravitational acceleration, which makes the Universe grow even more! If instead the Universe shrank slightly, one gets a net positive gravitational acceleration, which makes it shrink more! Any small deviation gets magnified, and the model is fundamentally flawed.
In addition to this flaw of instability, the static model's premise of a static Universe was shown by Hubble to be incorrect. This led Einstein to refer to the cosmological constant as his greatest blunder, and to drop it from his equations. But it still exists as a possibility -- a coefficient that should be determined from observations or fundamental theory.
Stephen Hawking's Universe
Three excellent reasons exist for believing in the big-bang theory. First, and most obvious, the universe is expanding. Second, the theory predicts that 25 percent of the total mass of the universe should be the helium that formed during the first few minutes, an amount that agrees with observations. Finally, and most convincing, is the presence of the cosmic background radiation. The big-bang theory predicted this remnant radiation, which now glows at a temperature just 3 degrees above absolute zero, well before radio astronomers chanced upon it.