Talk:Accelerating universe
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Hm. This is a bit out of my field, but isn't inflation theory another possible model for the accelerating universe phenomenon? -- April
Yes, but that's included in non-zero cosmological constant (which presumably caused inflation).
Wrong, sorry. The present non-zero cosmological constant/quintessence can be thought of as a form of inflation, but it probably has no relation to the inflationary scenarios (they are not theories, because they are too vague!). The inflationary scenarios generally talk about inflation when the Universe was about 10^(-33) seconds old, long before the microwave background epoch.
See the special edition of
Scientific American, Volume 12, Number 2
Title: The Once and Future Cosmos
It is readable, detailed, and current.
Randal Leavitt 00:40 Oct 13, 2002 (UTC)
Does anybody know what is the value of the acceleration of Hubble's constant in terms of dH/dt. There is an obscure relativistic effect that partly simulates the accelerated expansion of space. For our universe this simulated part would be of order of 2x10-36/s/s. I wonder how close this theoretical value is to the observed one. If close enough it might mean that the whole acceleration is just an illusion produced by subtleties of Einsteinian gravitation. Jim 20:41, 13 Jul 2004 (UTC)
- I'm not sure. It should be relatively trivial to get from Friedmann's equation (or rather a derivative of it) given Omega_m of .3 and Omega_lambda of .7 I think. You could always give it a go yourself and see how it comes out. Otherwise I'd suggest tracking down the original Type 1a supernova paper that suggested an accelerating universe. EddEdmondson 20:02, 14 Jul 2004 (UTC)
I think that this article could stand to be... Expanded. Mr. Billion 06:10, 5 Mar 2005 (UTC)
- I recently expanded the dark energy article. They are nearly the same topic. --Joke137 15:55, 5 Mar 2005 (UTC)
Redirect to dark energy?
I would like to directed this page to the dark energy article. The only information on this page which isn't in the general review in dark energy is the stuff about zero point and eternal intelligence, which might as well go into the pages that are being referred to. I think pages like ultimate fate of the universe, cosmological constant or quintessence (physics) could be useful as independent pages, but I can't really see anything going in here that wouldn't belong either in dark energy or a more specialized page on cosmology with Type Ia supernovae. --Joke137 18:11, 7 Mar 2005 (UTC)
Negative pressure
As a layman i have to ask what is negative pressure? Does it have anything to do with gravitational repulsive material? -- Orionix 00:56, 10 Mar 2005 (UTC)