Timeline for Cosmological constant doubts
Current License: CC BY-SA 3.0
10 events
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| May 26, 2014 at 9:31 | history | edited | JamalS | CC BY-SA 3.0 |
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| Apr 17, 2014 at 7:05 | comment | added | Danu | @MurtuzaVadharia just have a look around the forum; there are plenty of questions and answer about it. | |
| Apr 17, 2014 at 5:25 | comment | added | Murtuza Vadharia | inflationary theoplease say about inflation theory i am curiosity i have heard it but not able to recall | |
| Apr 16, 2014 at 20:41 | comment | added | Danu | No, by all means leave your comment. Discussion is always good. I think my main point is that, even if dark energy isn't 'just a cosmological constant', the fact it can be modeled so incredibly well by one tells us that the cosmological constant is worth studying! | |
| Apr 16, 2014 at 20:39 | comment | added | Flint72 | ...this is only one of many, though the most common of them. I did not mean to sound like I was toting crazy theories, so I will remove it if you like. I just didn't want this questioner to think that it is fully accepted that the Dark Energy is a cosmological constant. To re-quote wikipedia, the Dark Energy article discusses both Cosmological Constant and Quintessence as possible explinations, as well as having a section on Alternative Ideas, of which there are many more besides those mentioned in that article. | |
| Apr 16, 2014 at 20:30 | comment | added | Flint72 | sorry, yes indeed the $\Lambda \mbox{CDM}$ is known as the Stantard Model of Cosmology, but like the Standard Model of Elementary Particle Physics, we know that this is just a partial answer with lots left to be worked out. I was reffering specifically about the negative pressure dark fluid, which is, as you say, in $\Lambda \mbox{CDM}$ a cosmoligical constant with equation of state $ w = -1 $ However, most theories which try to give late universe accelerating cosmic expansion without simply adding it in by hand use an additional scalar field, such as Quintessence, say... | |
| Apr 16, 2014 at 20:14 | comment | added | Danu | @Flint72 I would say that the $\Lambda-CDM$ model is universally accepted, both from experience with researchers and googling, heh. 'Standard model of cosmology' yields en.wikipedia.org/wiki/Lambda-CDM_model as top hit, with no competitors in sight ;) | |
| Apr 16, 2014 at 20:11 | comment | added | Flint72 | I would just add that our universe is currently "evolving towards a universe where a seemlingly constant energy density dominates the total energy density". It is not for certain that the Dark Energy has constant equation of state $ w = -1 $ This indeed fits the observations, and is one of two leading models to explain the late universe accelerating cosmic expansion, but there are dozens of other models in which the cosmoligical constant does not in fact have to be constant, but rather evolves throughout the history of the universe. There is no universally accepted model yet. | |
| Apr 16, 2014 at 20:09 | history | edited | Danu | CC BY-SA 3.0 |
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| Apr 16, 2014 at 20:02 | history | answered | Danu | CC BY-SA 3.0 |