Talk:List of cosmological horizons
|WikiProject Astronomy||(Rated C-class, Low-importance)|
|WikiProject Physics||(Rated C-class, Low-importance)|
|A summary of this article appears in Big Bang.|
How big is a quarter?
Is that what they meant by "Quarter sized"? I was a little confused by that. As for the size... 24.26 mm in diameter.
"In any case, it is interesting to note that the cosmological horizon is a maximal limit of perception and not an actual boundary" ... I'm not sure this is a safe statement: the nature of reality is always relative to an observer. for example, doesn't this in-principle boundary of visibility form an event horizon with an equivalent effect to hawking radiation?Snaxalotl (talk) 03:47, 11 June 2009 (UTC)snaxalotl
Size of the Universe
I would like to see some mention here of the size of the Universe, such as can be found on the observable universe article.
I would also like to know what the difference is between the/a Cosmological Horizon and the/a Particle horizon.
Particle horizon ?
Isn't the particle horizon the distance at which are now objects from which we receive the light now, that's to say roughly 50 billion light years, not to confuse particle horizon with Hubble's horizon at 13.7 Gly ? (imagine an object emitting on the Hubble's horizon, the time its light comes to us, it would have moved (faster than light)) —Preceding unsigned comment added by 18.104.22.168 (talk) 08:56, 31 March 2010 (UTC)
Lineweaver and David
The above seems to conflict with the cited article by Lineweaver and Davis. In the case of a positive cosmological constant, an even horizon exists. — Preceding unsigned comment added by 22.214.171.124 (talk • contribs)
Some errors in this article
This article needs a review from an expert. As was stated in another comment, the article by Lineweaver and David points out clearly that the Hubble radius is not an event horizon when the Hubble parameter is not a constant in time (which, in the current accepted cosmological models, it is not). Light emitted from particles at the Hubble radius will still reach us in a finite time. Light emitted from the cosmic event horizon will reach us at infinite time. There is a very subtle difference between the two, but nevertheless an important one. The definitions in the article are partly right, mixed with wrong elements. I am no expert myself, so I will not alter too much. Someone with cosmological authority should. — Preceding unsigned comment added by 126.96.36.199 (talk) 09:04, 13 June 2017 (UTC)